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MAX5489ETE中文资料


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19-3478; Rev 3; 1/07

KIT ATION EVALU BLE AVAILA

Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers
General Description
The MAX5487/MAX5488/MAX5489 dual, linear-taper, digital potentiometers function as mechanical potentiometers with a simple 3-wire SPI?-compatible digital interface that programs the wipers to any one of 256 tap positions. These digital potentiometers feature a nonvolatile memory (EEPROM) to return the wipers to their previously stored positions upon power-up. The MAX5487 has an end-to-end resistance of 10kΩ, while the MAX5488 and MAX5489 have resistances of 50kΩ and 100kΩ, respectively. These devices have a low 35ppm/°C end-to-end temperature coefficient, and operate from a single +2.7V to +5.25V supply. The MAX5487/MAX5488/MAX5489 are available in 16-pin 3mm x 3mm x 0.8mm thin QFN or 14-pin TSSOP packages. Each device is guaranteed over the extended -40°C to +85°C temperature range.

Features
? Wiper Position Stored in Nonvolatile Memory (EEPROM) and Recalled Upon Power-Up or Recalled by an Interface Command ? 3mm x 3mm x 0.8mm, 16-Pin Thin QFN or 14-Pin TSSOP Packages ? ±1 LSB INL, ±0.5 LSB DNL (Voltage-Divider Mode) ? 256 Tap Positions ? 35ppm/°C End-to-End Resistance Temperature Coefficient ? 5ppm/°C Ratiometric Temperature Coefficient ? 10kΩ, 50kΩ, and 100kΩ End-to-End Resistance Values ? SPI-Compatible Serial Interface ? Reliability 200,000 Wiper Store Cycles 50-Year Wiper Data Retention ? +2.7V to +5.25V Single-Supply Operation
SPI is a trademark of Motorola, Inc.

MAX5487/MAX5488/MAX5489

Applications
LCD Screen Adjustment Audio Volume Control Mechanical Potentiometer Replacement Low-Drift Programmable Filters Low-Drift Programmable-Gain Amplifiers

Ordering Information/Selector Guide
PART MAX5487ETE TEMP RANGE -40°C to +85°C PIN-PACKAGE 16 Thin QFN-EP* END-TO-END RESISTANCE (kΩ) 10 10 TOP MARK ABR — PKG CODE T1633F U14-1

MAX5487EUD** -40°C to +85°C 14 TSSOP *EP = Exposed pad. **Future product—contact factory for availabilty. Ordering Information/Selector Guide continued at end of data sheet.

Pin Configurations
WB N.C. 9 8 7 6 5 1 VDD 2 SCLK 3 DIN 4 CS I.C. GND N.C. N.C.

TOP VIEW
HB 12 LA WA 13 14 15 16

Functional Diagram
VDD GND SCLK DIN CS 8-BIT LATCH 8 DECODER 256 WB SPI INTERFACE 16-BIT NV RAM LA POR HB 8-BIT LATCH 8 DECODER 256 WA HA

11

10

HA I.C.

MAX5487 MAX5488 MAX5489

MAX5487 MAX5488 MAX5489

LB

THIN QFN 3mm x 3mm

Pin Configurations continued at end of data sheet. 1

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

LB

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
ABSOLUTE MAXIMUM RATINGS
VDD to GND ...........................................................-0.3V to +6.0V All Other Pins to GND......................-0.3V to the lower of (VDD + 0.3V) and +6.0V Maximum Continuous Current into H_, W_, and L_ MAX5487......................................................................±5.0mA MAX5488......................................................................±1.3mA MAX5489......................................................................±0.6mA Continuous Power Dissipation (TA = +70°C) 16-Pin Thin QFN (derate 17.5mW/°C above +70°C).....1398mW 14-Pin TSSOP (derate 9.1mW/°C above +70°C).............727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

DC ELECTRICAL CHARACTERISTICS
(VDD = +2.7V to +5.25V, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER Resolution Integral Nonlinearity Differential Nonlinearity Dual-Code Matching End-to-End Resistor Tempco Ratiometric Resistor Tempco MAX5487 Full-Scale Error MAX5488 MAX5489 MAX5487 Zero-Scale Error MAX5488 MAX5489 DC PERFORMANCE (Variable-Resistor Mode, Figure 1) Resolution Integral Nonlinearity (Note 3) Differential Nonlinearity (Note 3) DC PERFORMANCE (Resistor Characteristics) Wiper Resistance (Note 4) Wiper Capacitance End-to-End Resistance RW CW MAX5487 RHL MAX5488 MAX5489 7.5 37.5 75 VDD = 5.0V VDD = 3.0V 200 325 50 10 50 100 12.5 62.5 125 kΩ 350 675 Ω pF VDD = 5.0V VDD = 3.0V VDD = 5.0V VDD = 3.0V 256 ±1.5 ±3 ±1 ±1 Taps LSB LSB TCR SYMBOL N INL DNL (Note 2) (Note 2) Register A = register B 35 5 3.5 -0.6 -0.3 3.5 -0.6 0.3 6 +1.2 +1.2 6 1.5 1 LSB LSB CONDITIONS MIN 256 ±1 ±0.5 2 TYP MAX UNITS Taps LSB LSB LSB ppm/°C ppm/°C

DC PERFORMANCE (Voltage-Divider Mode, Figure 1)

2

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers
DC ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER DIGITAL INPUTS VDD = 3.6V to 5.25V Input High Voltage (Note 5) Input Low Voltage Input Leakage Current Input Capacitance AC PERFORMANCE Crosstalk fH_ = 1kHz, L_ = GND, measurement at W_ (Note 6) MAX5487 -3dB Bandwidth BW Wiper at midscale CW_ = 10pF MAX5488 MAX5489 -90 350 90 45 0.02 % kHz dB VIH VIL IIN CIN 5.0 VDD = 2.7V to 3.6V VDD = 2.7V to 5.25V (Note 5) 2.4 0.7 x VDD 0.8 ±1.0 V V ?A pF SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX5487/MAX5488/MAX5489

Total Harmonic Distortion TIMING CHARACTERISTICS (Analog)

THD

VH_ = 1VRMS at 1kHz, L_ = GND, measurement at W_ MAX5487

0.5 0.75 1.5 5 MHz ns ns ns ns ns ns ns ns ns ns 12 1 1 ms ?s ?s Years Stores ?s

Wiper-Settling Time

tS

Code 0 to 127 (Note 7)

MAX5488 MAX5489

TIMING CHARACTERISTICS (Digital, Figure 2, Note 8) SCLK Frequency SCLK Clock Period SCLK Pulse-Width High SCLK Pulse-Width Low CS Fall to SCLK Rise Setup SCLK Rise to CS Rise Hold DIN to SCLK Setup DIN Hold after SCLK SCLK Rise to CS Fall Delay CS Rise to SCLK Rise Hold CS Pulse-Width High Write NV Register Busy Time Read NV Register Access Time Write Wiper Register to Output Delay NONVOLATILE MEMORY RELIABILITY Data Retention Endurance TA = +85°C TA = +25°C TA = +85°C 50 200,000 50,000 tCP tCH tCL tCSS tCSH tDS tDH tCS0 tCS1 tCSW tBUSY tACC tWO 200 80 80 80 0 50 0 20 80 200

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
DC ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, VH = VDD, VL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER POWER SUPPLIES Power-Supply Voltage Supply Current Standby Current VDD IDD During write cycle only, digital inputs = VDD or GND Digital inputs = VDD or GND, TA = +25°C 0.5 2.70 5.25 400 1 V ?A ?A SYMBOL CONDITIONS MIN TYP MAX UNITS

Note 1: All devices are production tested at TA = +85°C and are guaranteed by design and characterization for -40°C < TA < +85°C. Note 2: DNL and INL are measured with the potentiometer configured as a voltage-divider with H_ = VDD and L_ = 0. The wiper terminal is unloaded and measured with an ideal voltmeter. Note 3: DNL and INL are measured with the potentiometer configured as a variable resistor. H_ is unconnected and L_ = 0. For VDD = +5V, the wiper terminal is driven with a source current of 400?A for the 10kΩ configuration, 80?A for the 50kΩ configuration, and 40?A for the 100kΩ configuration. For VDD = +3V, the wiper terminal is driven with a source current of 200?A for the 10kΩ configuration, 40?A for the 50kΩ configuration, and 20?A for the 100kΩ configuration. Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. RW = (VW - VH) / IW. Note 5: The device draws higher supply current when the digital inputs are driven with voltages between (VDD - 0.5V) and (GND + 0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics section. Note 6: Wiper at midscale with a 10pF load. Note 7: Wiper-settling time is the worst-case 0-to-50% rise time, measured between tap 0 and tap 127. H_ = VDD, L_ = GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see Tap-to-Tap Switching Transient in the Typical Operating Characteristics section). Note 8: Digital timing is guaranteed by design and characterization, and is not production tested.

VOLTAGE-DIVIDER CONFIGURATION H

VARIABLE-RESISTOR CONFIGURATION H

W

L

L

Figure 1. Voltage-Divider/Variable-Resistor Configurations

4

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers
Typical Operating Characteristics
(VDD = +5.0V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX5487-89 toc01

MAX5487/MAX5488/MAX5489

SUPPLY CURRENT vs. DIGITAL INPUT VOLTAGE
MAX5487-89 toc02

WIPER RESISTANCE vs. TAP POSITION
MAX5487-89 toc03

0.6 0.5 SUPPLY CURRENT (μA) 0.4 0.3 0.2 0.1 0 -40 -20 0 20 40 60 80 TEMPERATURE (°C) VDD = 3V VDD = 5V

10,000

250

1000 SUPPLY CURRENT (μA) VCC = 5V 100

200 WIPER RESISTANCE (Ω)

150

10 VCC = 3V 1

100

50

0 0 1 2 3 4 5 DIGITAL INPUT VOLTAGE (V)

0 0 32 64 96 128 160 192 224 256 TAP POSITION

TAP-TO-TAP SWITCHING TRANSIENT (MAX5487)
VH_ = 5.0V

TAP-TO-TAP SWITCHING TRANSIENT (MAX5488)
MAX5487-89 toc05

TAP-TO-TAP SWITCHING TRANSIENT (MAX5489)
MAX5487-89 toc06

MAX5487-89 toc04

VH_ = 5.0V CS 2.0V/div CS 2.0V/div CS 2.0V/div

VH_ = 5.0V

WIPER 20mV/div

WIPER 20mV/div

WIPER 20mV/div

1μs/div

1.0μs/div

1.0μs/div

WIPER TRANSIENT AT POWER-ON
MAX5487-89 toc07

MIDSCALE FREQUENCY RESPONSE (MAX5487)
0 -2 -4 CW = 10pF
MAX5487-89 toc08

VH_ = VDD

GAIN (dB)

VDD 2.0V/div

-6 -8 -10 -12 -14 -16 -18 -20 2.0μs/div 0.1 1 10 100 FREQUENCY (kHz) 1000 CW_ = 50pF

WIPER 2.0V/div

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
Typical Operating Characteristics (continued)
(VDD = +5.0V, TA = +25°C, unless otherwise noted.)
MIDSCALE FREQUENCY RESPONSE (MAX5488)
MAX5487-89 toc09

MIDSCALE FREQUENCY RESPONSE (MAX5489)
MAX5487-89 toc10

VARIABLE-RESISTOR DNL vs. TAP POSITION (MAX5488)
0.15 0.10 DNL (LSB) 0.05 0 -0.05 -0.10 -0.15 -0.20
MAx5487-89 toc11

0 -5 -10 -15 GAIN (dB) -20 -25 -30 -35 -40 -45 -50 0.1 1 10 FREQUENCY (kHz) 100 CW_ = 50pF CW_ = 10pF

0 -5 -10 -15 GAIN (dB) -20 -25 -30 -35 -40 -45 CW_ = 50pF CW_ = 10pF

0.20

1000

-50 0.1 1 10 FREQUENCY (kHz) 100 1000

0

32

64

96

128 160 192 224 256

TAP POSITION

VARIABLE-RESISTOR INL vs. TAP POSITION (MAX5488)
MAx5487-89 toc12

VOLTAGE-DIVIDER DNL vs. TAP POSITION (MAX5487)
MAX5487-89 toc13

VOLTAGE-DIVIDER INL vs. TAP POSITION (MAX5487)
1.2 1.0 0.8
MAX5487-89 toc14

1.0 0.8 0.6 0.4

0.20 0.15 0.10 DNL (LSB) 0.05 0 -0.05 -0.10 -0.15 -0.20

1.4

INL (LSB)

INL (LSB) 0 32 64 96 128 160 192 224 256

0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 32 64 96 128 160 192 224 256 TAP POSITION

0.6 0.4 0.2 0 0.2 0.4 0.6 0 32 64 96 128 160 192 224 256

TAP POSITION

TAP POSITION

VOLTAGE-DIVIDER DNL vs. TAP POSITION (MAX5488)
MAx5487-89 toc15

VOLTAGE-DIVIDER INL vs. TAP POSITION (MAX5488)
0.8 0.6 0.4 INL (LSB) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
MAx5487-89 toc16

0.20 0.15 0.10 DNL (LSB) 0.05 0 -0.05 -0.10 -0.15 -0.20 0 32 64 96

1.0

128 160 192 224 256

0

32

64

96

128 160 192 224 256

TAP POSITION

TAP POSITION

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers
Typical Operating Characteristics (continued)
(VDD = +5.0V, TA = +25°C, unless otherwise noted.)
VARIABLE-RESISTOR DNL vs. TAP POSITION (MAX5489)
MAx5487-89 toc17

MAX5487/MAX5488/MAX5489

VARIABLE-RESISTOR INL vs. TAP POSITION (MAX5489)
MAx5487-89 toc18

VOLTAGE-DIVIDER DNL vs. TAP POSITION (MAX5489)
0.15 0.10 DNL (LSB) 0.05 0 -0.05 -0.10 -0.15 -0.20
MAx5487-89 toc19

0.20 0.15 0.10 DNL (LSB) 0.05 0 -0.05 -0.10 -0.15 -0.20 0 32 64 96

1.0 0.8 0.6 0.4 INL (LSB) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0

0.20

128 160 192 224 256

0

32

64

96

128 160 192 224 256

0

32

64

96

128 160 192 224 256

TAP POSITION

TAP POSITION

TAP POSITION

VOLTAGE-DIVIDER INL vs. TAP POSITION (MAX5489)
MAx5487-89 toc20

CROSSTALK vs. FREQUENCY
MAX5487-89 toc21

END-TO-END RESISTANCE CHANGE vs. TEMPERATURE (MAX5487)
0.008 RESISTANCE CHANGE (%) 0.006 0.004 0.002 0 -0.002 -0.004 -0.006
MAX5487-89 toc22

1.0 0.8 0.6 0.4 INL (LSB) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 32 64 96

-30 CW_ = 10pF -40 CROSSTALK (dB) -50 -60 -70 -80 -90 -100 MAX5489 MAX5488 MAX5487

0.010

-0.008 -0.010 0.1 1 10 100 FREQUENCY (kHz) 1000 -40 -15 10 35 60 85 TEMPERATURE (°C)

128 160 192 224 256

TAP POSITION

END-TO-END RESISTANCE CHANGE vs. TEMPERATURE (MAX5488)
MAX5487-89 toc23

END-TO-END RESISTANCE CHANGE vs. TEMPERATURE (MAX5489)
0.008 RESISTANCE CHANGE (%) 0.006 0.004 0.002 0 -0.002 -0.004 -0.006 -0.008 -0.010
MAX5487-89 toc24

0.010 0.008 RESISTANCE CHANGE (%) 0.006 0.004 0.002 0 -0.002 -0.004 -0.006 -0.008 -0.010 -40 -15 10 35 60

0.010

85

-40

-15

10

35

60

85

TEMPERATURE (°C)

TEMPERATURE (°C)

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
Pin Description
PIN TQFN 1 2 3 4 5, 6, 9 7 8, 16 10 11 12 13 14 15 EP TSSOP 14 13 12 11 7, 9, 10 8 — 6 5 4 3 2 1 — NAME VDD SCLK DIN CS N.C. GND I.C. LB WB HB LA WA HA EP FUNCTION Power Supply. Bypass to GND with a 0.1?F capacitor as close to the device as possible. Serial-Interface Clock Input Serial-Interface Data Input Active-Low Chip-Select Digital Input No Connection. Not internally connected. Ground Internally connected to EP. Leave unconnected. Low Terminal of Resistor B. The voltage at L can be greater than or less than the voltage at H. Current can flow into or out of L. Wiper Terminal of Resistor B High Terminal of Resistor B. The voltage at H can be greater than or less than the voltage at L. Current can flow into or out of H. Low Terminal of Resistor A. The voltage at L can be greater than or less than the voltage at H. Current can flow into or out of L. Wiper Terminal of Resistor A High Terminal of Resistor A. The voltage at H can be greater than or less than the voltage at L. Current can flow into or out of H. Exposed Pad. Internally connected to pins 8 and 16. Leave unconnected.

Detailed Description
The MAX5487/MAX5488/MAX5489 contain two resistor arrays, with 255 resistive elements each. The MAX5487 has an end-to-end resistance of 10kΩ, while the MAX5488 and MAX5489 have resistances of 50kΩ and 100kΩ, respectively. The MAX5487/MAX5488/MAX5489 allow access to the high, low, and wiper terminals on both potentiometers for a standard voltage-divider configuration. Connect the wiper to the high terminal, and connect the low terminal to ground, to make the device a variable resistor (see Figure 1). A simple 3-wire serial interface programs either wiper directly to any of the 256 tap points. The nonvolatile memory stores the wiper position prior to power-down and recalls the wiper to the same point upon power-up or by using an interface command (see Table 1). The nonvolatile memory is guaranteed for 200,000 wiper store cycles and 50 years for wiper data retention.

(CS), data clock (SCLK), and data in (DIN). Drive CS low to enable the serial interface and clock data synchronously into the shift register on each SCLK rising edge. The WRITE commands (C1, C0 = 00 or 01) require 16 clock cycles to clock in the command, address, and data (Figure 3a). The COPY commands (C1, C0 = 10, 11) can use either eight clock cycles to transfer only command and address bits (Figure 3b) or 16 clock cycles, with the device disregarding 8 data bits (Figure 3a). After loading data into the shift register, drive CS high to latch the data into the appropriate potentiometer control register and disable the serial interface. Keep CS low during the entire serial data stream to avoid corruption of the data. Digital-Interface Format The data format consists of three elements: command bits, address bits, and data bits (see Table 1 and Figure 3). The command bits (C1 and C0) indicate the action to be taken such as changing or storing the wiper position. The address bits (A1 and A0) specify which potentiometer the command affects and the 8 data bits (D7 to D0) specify the wiper position.

SPI Digital Interface
The MAX5487/MAX5488/MAX5489 use a 3-wire SPIcompatible serial data interface (Figures 2 and 3). This write-only interface contains three inputs: chip-select
8

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
Table 1. Register Map
CLOCK EDGE Write Wiper Register A Write Wiper Register B Write NV Register A Write NV Register B Copy Wiper Register A to NV Register A Copy Wiper Register B to NV Register B Copy Both Wiper Registers to NV Registers Copy NV Register A to Wiper Register A Copy NV Register B to Wiper Register B Copy Both NV Registers to Wiper Registers 1 — 0 0 0 0 0 0 0 0 0 0 2 — 0 0 0 0 0 0 0 0 0 0 3 C1 0 0 0 0 1 1 1 1 1 1 4 C0 0 0 1 1 0 0 0 1 1 1 5 — 0 0 0 0 0 0 0 0 0 0 6 — 0 0 0 0 0 0 0 0 0 0 7 A1 0 1 0 1 0 1 1 0 1 1 8 A0 1 0 1 0 1 0 1 1 0 1 9 D7 D7 D7 D7 D7 — — — — — — 10 D6 D6 D6 D6 D6 — — — — — — 11 D5 D5 D5 D5 D5 — — — — — — 12 D4 D4 D4 D4 D4 — — — — — — 13 D3 D3 D3 D3 D3 — — — — — — 14 D2 D2 D2 D2 D2 — — — — — — 15 D1 D1 D1 D1 D1 — — — — — — 16 D0 D0 D0 D0 D0 — — — — — —

CS tCSW tCSO tCSS SCLK tDS tDH tCL tCH tCP tCSH tCS1

DIN

Figure 2. Timing Diagram

Write-Wiper Register (Command 00) Data written to the write-wiper registers (C1, C0 = 00) controls the wiper positions. The 8 data bits (D7 to D0) indicate the position of the wiper. For example, if DIN = 0000 0000, the wiper moves to the position closest to L_. If DIN = 1111 1111, the wiper moves closest to H_. This command writes data to the volatile RAM, leaving the NV registers unchanged. When the device powers up, the data stored in the NV registers transfers to the volatile wiper register, moving the wiper to the stored position.

Write-NV Register (Command 01) This command (C1, C0 = 01) stores the position of the wipers to the NV registers for use at power-up. Alternatively, the “copy wiper register to NV register” command can be used to store the position of the wipers to the NV registers. Writing to the NV registers does not affect the position of the wipers. Copy Wiper Register to NV Register (Command 10) This command (C1, C0 = 10) stores the current position of the wiper to the NV register, for use at power-up.
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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
A) 16-BIT COMMAND/DATA WORD CS

SCLK

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

DIN

C1

C0

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

B) 8-BIT COMMAND WORD CS

SCLK 1 DIN 2 3 C1 4 C0 5 6 7 A1 8 A0

Figure 3. Digital-Interface Format

This command may affect one potentiometer at a time, or both simultaneously, depending on the state of A1 and A0. Alternatively, the “write NV register” command can be used to store the current position of the wiper to the NV register. Copy NV Register to Wiper Register (Command 11) This command (C1, C0 = 11) restores the wiper position to the previously stored position in the NV register. This command may affect one potentiometer at a time, or both simultaneously, depending on the state of A1 and A0.

Standby
The MAX5487/MAX5488/MAX5489 feature a low-power standby mode. When the device is not being programmed, it enters into standby mode and supply current drops to 0.5?A (typ).

Applications Information
The MAX5487/MAX5488/MAX5489 are ideal for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control (where voltage biasing adjusts the display contrast), or for programmable filters with adjustable gain and/or cutoff frequency.

Nonvolatile Memory
The internal EEPROM consists of a nonvolatile register that retains the last stored value prior to power-down. The nonvolatile register is programmed to midscale at the factory. The nonvolatile memory is guaranteed for 200,000 wiper write cycles and 50 years for wiper data retention.

Positive LCD Bias Control
Figures 4 and 5 show an application where the MAX5487/MAX5488/MAX5489 provide an adjustable, positive LCD-bias voltage. The op amp provides buffering and gain to the resistor-divider network made by the potentiometer (Figure 4) or by a fixed resistor and a variable resistor (Figure 5).

Power-Up
Upon power-up, the MAX5487/MAX5488/MAX5489 load the data stored in the nonvolatile wiper register into the volatile memory register, updating the wiper position with the data stored in the nonvolatile wiper register. This initialization period takes 5?s.
10

Programmable Filter
Figure 6 shows the MAX5487/MAX5488/MAX5489 in a 1st-order programmable-filter application. Adjust the gain of the filter with R2, and set the cutoff frequency with R3.

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers
5V H_ 30V MAX5487 MAX5488 MAX5489 L_ W_ MAX480 VOUT

Use the following equations to calculate the gain (A) and the -3dB cutoff frequency (fC): A =1+ R1 R2

MAX5487/MAX5488/MAX5489

fC =

1 2π × R3 × C

Adjustable Voltage Reference
Figure 7 shows the MAX5487/MAX5488/MAX5489 used as the feedback resistors in multiple adjustable voltage-reference applications. Independently adjust the output voltages of the MAX6160s from 1.23V to VIN 0.2V by changing the wiper positions of the MAX5487/ MAX5488/MAX5489.

Figure 4. Positive LCD-Bias Control Using a Voltage-Divider

5V

Offset Voltage and Gain Adjustment
30V

H_ MAX5487 MAX5488 MAX5489 L_

MAX480

VOUT

W_

Connect the high and low terminals of one potentiometer of a MAX5487/MAX5488/MAX5489 to the NULL inputs of a MAX410, and connect the wiper to the op amp’s positive supply to nullify the offset voltage over the operating temperature range. Install the other potentiometer in the feedback path to adjust the gain of the MAX410 (see Figure 8).

Chip Information
TRANSISTOR COUNT: 12,177 PROCESS: BiCMOS

Figure 5. Positive LCD-Bias Control Using a Variable Resistor

Pin Configurations (continued)
WA V+ VIN LA HA R3 C MAX410 VOUT

TOP VIEW
HA 1 WA 2 LA 3 14 VDD 13 SCLK 12 DIN

1/2 MAX5487 1/2 MAX5488 1/2 MAX5489
R2, R3 = RHL x D / 256 WHERE RHL = END-TO-END RESISTANCE AND D = DECIMAL VALUE OF WIPER CODE R2 HB

VR1

HB 4 WB 5 LB 6 N.C. 7

MAX5487 MAX5488 MAX5489

11 CS 10 N.C. 9 N.C. 8 GND

WB

1/2 MAX5487 1/2 MAX5488 1/2 MAX5489

TSSOP
LB

Figure 6. Programmable Filter ______________________________________________________________________________________ 11

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Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
5V 10kΩ FOR THE MAX5487 R 50kΩ VOUT_ = 1.23V x FOR THE MAX5488 R 100kΩ VOUT_ = 1.23V x FOR THE MAX5489 R VOUT_ = 1.23V x R2 = RHL x D / 256 WHERE RHL = END-TO-END RESISTANCE AND D = DECIMAL VALUE OF WIPER CODE

IN

OUT HA

V OUT1

IN

OUT HB

VOUT2

MAX6160
ADJ GND WA R LA

MAX6160 1/2 MAX5487 1/2 MAX5488 1/2 MAX5489
ADJ GND WB R LB

1/2 MAX5487 1/2 MAX5488 1/2 MAX5489

Figure 7. Adjustable Voltage Reference

5V WA 1/2 MAX5487/MAX5488/MAX5489 HA 7 3 1 8 MAX410 2 4 R1 HB 6 R2 = RHL x D / 256 WHERE RHL = END-TO-END RESISTANCE AND = D DECIMAL VALUE OF WIPER CODE LA

Revision History
Pages changed at Rev3: 1, 8, 12, 15

1/2 MAX5487/MAX5488/MAX5489
R2 LB WB

Figure 8. Offset Voltage and Gain Adjustment

Ordering Information/Selector Guide (continued)
PART MAX5488ETE MAX5488EUD** MAX5489ETE MAX5489EUD** TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 16 Thin QFN-EP* 14 TSSOP 16 Thin QFN-EP* 14 TSSOP END-TO-END RESISTANCE (kΩ) 50 50 100 100 TOP MARK ABS — ABT — PKG CODE T1633F U14-1 T1633F U14-1

*EP = Exposed pad **Future product—contact factory for availabilty.

12

______________________________________________________________________________________

元器件交易网www.cecb2b.com

Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)

MAX5487/MAX5488/MAX5489

PACKAGE OUTLINE, TSSOP 4.40mm BODY

21-0066

I

1 1

______________________________________________________________________________________

TSSOP4.40mm.EPS

13

元器件交易网www.cecb2b.com

Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
12x16L QFN THIN.EPS
L

MARKING

E E/2
(ND - 1) X e

(NE - 1) X e

D2/2

D/2 D

AAAA
C L

e D2

k

b E2/2

0.10 M C A B

C L

L

E2

0.10 C

0.08 C A A2 A1 L

C L

C L

e

e

PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm

21-0136

I

1 2

PKG REF. A b D E e L N ND NE A1 A2 k 0.25 0 0.35

8L 3x3 MIN. NOM. MAX. 0.70 0.25 2.90 2.90 0.75 0.30 3.00 3.00 0.55 8 2 2 0.02 0.20 REF 0.25 0.05 0 0.80 0.35 3.10 3.10 0.75

12L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.45 0.75 0.25 3.00 3.00 0.55 12 3 3 0.02 0.20 REF 0.25 0.05 0 0.80 0.30 3.10 3.10 0.65

16L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.30 0.75 0.25 3.00 3.00 0.40 16 4 4 0.02 0.20 REF 0.05 0.80 0.30 3.10 3.10 0.50 PKG. CODES TQ833-1 T1233-1 T1233-3 T1233-4 T1633-2 T1633F-3 T1633FH-3 T1633-4 T1633-5

EXPOSED PAD VARIATIONS
D2 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 E2 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 PIN ID 0.35 x 45° 0.35 x 45° 0.35 x 45° 0.35 x 45° 0.35 x 45° 0.225 x 45° 0.225 x 45° 0.35 x 45° 0.35 x 45° JEDEC WEEC WEED-1 WEED-1 WEED-1 WEED-2 WEED-2 WEED-2 WEED-2 WEED-2

0.65 BSC.

0.50 BSC.

0.50 BSC.

NOTES: 1. 2. 3. 4. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. N IS THE TOTAL NUMBER OF TERMINALS. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. DRAWING CONFORMS TO JEDEC MO220 REVISION C. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. WARPAGE NOT TO EXCEED 0.10mm.

5. 6. 7. 8. 9. 10. 11. 12.

PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm

21-0136

I

2 2

14

______________________________________________________________________________________

元器件交易网www.cecb2b.com

Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers MAX5487/MAX5488/MAX5489
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)

PKG REF. A b D E e L N ND NE A1 A2 k 0.25 0 0.35

8L 3x3 MIN. NOM. MAX. 0.70 0.25 2.90 2.90 0.75 0.30 3.00 3.00 0.55 8 2 2 0.02 0.20 REF 0.25 0.05 0 0.80 0.35 3.10 3.10 0.75

12L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.45 0.75 0.25 3.00 3.00 0.55 12 3 3 0.02 0.20 REF 0.25 0.05 0 0.80 0.30 3.10 3.10 0.65

16L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.30 0.75 0.25 3.00 3.00 0.40 16 4 4 0.02 0.20 REF 0.05 0.80 0.30 3.10 3.10 0.50 PKG. CODES TQ833-1 T1233-1 T1233-3 T1233-4 T1633-2 T1633F-3 T1633FH-3 T1633-4 T1633-5

EXPOSED PAD VARIATIONS
D2 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 E2 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 PIN ID 0.35 x 45° 0.35 x 45° 0.35 x 45° 0.35 x 45° 0.35 x 45° 0.225 x 45° 0.225 x 45° 0.35 x 45° 0.35 x 45° JEDEC WEEC WEED-1 WEED-1 WEED-1 WEED-2 WEED-2 WEED-2 WEED-2 WEED-2

0.65 BSC.

0.50 BSC.

0.50 BSC.

NOTES: 1. 2. 3. 4. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. N IS THE TOTAL NUMBER OF TERMINALS. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. DRAWING CONFORMS TO JEDEC MO220 REVISION C. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. WARPAGE NOT TO EXCEED 0.10mm.

5. 6. 7. 8. 9. 10. 11. 12.

PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm

21-0136

I

2 2

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 ? 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.


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