General Description
The MAX5422/MAX5423/MAX5424 nonvolatile, linear-
taper, digital potentiometers perform the function of a
mechanical potentiometer, but replace the mechanics
with a simple 3-wire SPI™-compatible digital interface.
Each device performs the same function as a discrete
potentiometer or variable resistor and has 256 tap points.
The devices feature an internal, nonvolatile EEPROM
used to store the wiper position for initialization during
power-up. The 3-wire SPI-compatible serial interface
allows communication at data rates up to 5MHz, mini-
mizing board space and reducing interconnection com-
plexity in many applications.
The MAX5422/MAX5423/MAX5424 provide three nomi-
nal resistance values: 50kΩ(MAX5422), 100kΩ
(MAX5423), or 200kΩ(MAX5424). The nominal resistor
temperature coefficient is 35ppm/°C end-to-end and
only 5ppm/°C ratiometric. This makes the devices ideal
for applications requiring a low-temperature-coefficient
variable resistor, such as low-drift, programmable gain-
amplifier circuit configurations.
The MAX5422/MAX5423/MAX5424 are available in a
3mm x 3mm 8-pin TDFN package, and are specified
over the extended -40°C to +85°C temperature range.
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable Gain Amplifiers
Audio Volume Control
Liquid-Crystal Display (LCD) Contrast Control
Low-Drift Programmable Filters
Features
♦Wiper Position Stored in Nonvolatile Memory
(EEPROM) and Recalled Upon Power-Up or
Interface Command
♦3mm x 3mm x 0.8mm TDFN Package
♦35ppm/°C End-to-End Resistance Temperature
Coefficient
♦5ppm/°C Ratiometric Temperature Coefficient
♦50kΩ, 100kΩ, and 200kΩResistor Values
♦5MHz SPI-Compatible Serial Interface
♦500nA (typ) Static Supply Current
♦Single-Supply Operation: +2.7V to +5.25V
♦256 Tap Positions
♦±0.5 LSB DNL in Voltage-Divider Mode
♦±0.5 LSB INL in Voltage-Divider Mode
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information/Selector Guide
19-3371; Rev 0; 7/04
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE END-TO-END
RESISTANCE (kΩ)PIN-PACKAGE TOP MARK
MAX5422ETA -40°C to +85°C50
8 TDFN-EP* AIJ
MAX5423ETA -40°C to +85°C 100 8 TDFN-EP* AII
MAX5424ETA -40°C to +85°C 200 8 TDFN-EP* AIH
VDD
SCLK
DIN
GND
1
2
3
45
W
H
6
7
8
L
TDFN (3mm x 3mm)
TOP VIEW
CS
MAX5422
MAX5423
MAX5424
Pin Configuration
W
L
SPI
INTERFACE
256-
POSITION
DECODER
VDD
GND
SCLK 8-BIT
NV
MEMORY
8-BIT
LATCH
8-BIT
SHIFT
REGISTER
POR
H
88256
DIN
CS MAX5422
MAX5423
MAX5424
Functional Diagram
SPI is a trademark of Motorola, Inc.
*EP = Exposed pad.
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C. Typical values are at VDD = +5.0V, TA= +25°C, unless otherwise noted.)
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.
VDD to GND...........................................................-0.3V to +6.0V
All Other Pins to GND.................................-0.3V to (VDD + 0.3V)
Maximum Continuous Current into H, L, and W
MAX5422......................................................................±1.3mA
MAX5423......................................................................±0.6mA
MAX5424......................................................................±0.3mA
Continuous Power Dissipation (TA= +70°C)
8-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC PERFORMANCE (VOLTAGE-DIVIDER MODE)
Resolution N 256 Taps
Integral Nonlinearity INL (Note 1) ±0.5 LSB
Differential Nonlinearity DNL (Note 1) ±0.5 LSB
End-to-End Resistance
Temperature Coefficient TCR35 ppm/°C
Ratiometric Resistance
Temperature Coefficient 5 ppm/°C
MAX5422 -0.6
MAX5423 -0.3Full-Scale Error
MAX5424 -0.15
LSB
MAX5422 0.7
MAX5423 0.35
Zero-Scale Error
MAX5424 0.18
LSB
DC PERFORMANCE (VARIABLE-RESISTOR MODE)
VDD = 3V ±3.0
Integral Nonlinearity
(Note 2) INL VDD = 5V ±1.5 LSB
VDD = 3V, MAX5422, -40°C ≤ TA ≤ +85°C,
guaranteed monotonic -1.0 +2.0
VDD = 3V, MAX5422, 0°C ≤ TA ≤ +85°C,
guaranteed monotonic -1.0 +1.2
VDD = 3V, MAX5423 ±1.0
VDD = 3V, MAX5424 ±1.0
Differential Nonlinearity
(Note 2) DNL
VDD = 5V ±1.0
LSB
DC PERFORMANCE (RESISTOR CHARACTERISTICS)
Wiper Resistance RWVDD = 3V to 5.25V (Note 3) 325 675 Ω
Wiper Capacitance CW10 pF
MAX5422 37.5 50 62.5
MAX5423 75 100 125End-to-End Resistance
MAX5424 150 200 250
kΩ
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C. Typical values are at VDD = +5.0V, TA= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUTS (CS, DIN, SCLK)
VDD = 3.4V to 5.25V 2.4
Input High Voltage (Note 4) VIH VDD < 3.4V 0.7 x
VDD
V
Input Low Voltage VIL VDD = 2.7V to 5.25V (Note 4) 0.8 V
Input Leakage Current IIN ±0.1 ±1 µA
Input Capacitance CIN 5pF
DYNAMIC CHARACTERISTICS
MAX5422 100
MAX5423 50
Wiper -3dB Bandwidth (Note 5)
MAX5424 25
kHz
NONVOLATILE MEMORY RELIABILITY
Data Retention TA = +85°C 50 Years
TA = +25°C 200,000
Endurance TA = +85°C 50,000 Stores
POWER SUPPLY
Supply Voltage VDD 2.70 5.25 V
Standby Current IDD Digital inputs = VDD or GND, TA = +25°C 0.5 1 µA
Programming Current IPG During nonvolatile write to memory; digital
inputs = VDD or GND (Note 6) 200 400 µA
TIMING CHARACTERISTICS
(VDD = +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C. Typical values are at VDD = +5.0V, TA= +25°C, unless otherwise
noted. See Figure 1.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ANALOG SECTION
MAX5422 400
MAX5423 600Wiper Settling Time (Note 8) tS
MAX5424 1000
ns
DIGITAL SECTION
SCLK Frequency fSCLK 5MHz
SCLK Clock Period tCP 200 ns
SCLK Pulse-Width High tCH 80 ns
SCLK Pulse-Width Low tCL 80 ns
CS Fall to SCLK Rise Setup tCSS 80 ns
SCLK Rise to CS Rise Hold tCSH 0ns
DIN to SCLK Setup tDS 50 ns
DNL vs. TAP POSITION
MAX5422 toc01
TAP POSITION
DNL (LSB)
224192128 16064 9632
-0.20
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
0.25
-0.25
0256
VOLTAGE-DIVIDER MODE
INL vs. TAP POSITION
MAX5422 toc02
TAP POSITION
INL (LSB)
224192128 16064 9632
-0.20
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
0.25
-0.25
0256
VOLTAGE-DIVIDER MODE
RESISTANCE (Ω)
100
200
300
400
500
600
700
0
WIPER RESISTANCE vs. TAP POSITION
MAX5422 toc03
TAP POSITION
224192128 16064 96320 256
VDD = 2.7V
ISRC = 50μA
Typical Operating Characteristics
(VDD = 5.0V, TA= +25°C, unless otherwise noted.)
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
4 _______________________________________________________________________________________
TIMING CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C. Typical values are at VDD = +5.0V, TA= +25°C, unless otherwise
noted. See Figure 1.) (Note 7)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIN Hold after SCLK tDH 0ns
SCLK Rise to CS Fall Delay tCS0 20 ns
CS Rise to SCLK Rise Hold tCS1 80 ns
CS Pulse-Width High tCSW 200 ns
Write NV Register Busy Time tBUSY 12 ms
Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDD and L = GND. The
wiper terminal is unloaded and measured with a high-input-impedance voltmeter.
Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = GND.
For the 5V condition, the wiper terminal is driven with a source current of 80µA for the 50kΩconfiguration, 40µA for the
100kΩconfiguration, and 20µA for the 200kΩconfiguration. For the 3V condition, the wiper terminal is driven with a source
current of 40µA for the 50kΩconfiguration, 20µA for the 100kΩ, and 10µA for the 200kΩconfiguration.
Note 3: The wiper resistance is measured using the source currents given in Note 2. For operation to VDD = 2.7V, see Maximum
Wiper Resistance vs. Temperature in the Typical Operating Characteristics.
Note 4: 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.
Note 5: Wiper at midscale with a 10pF load (DC measurement). L = GND; an AC source is applied to H; and the W output is mea-
sured. A 3dB bandwidth occurs when the AC W/H value is 3dB lower than the DC W/H value.
Note 6: The programming current operates only during power-up and NV writes.
Note 7: Digital timing is guaranteed by design and characterization, and is not production tested.
Note 8: Wiper-settling time is the worst-case 0% to 50% rise-time measured between consecutive wiper positions. H = VDD, L =
GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe.
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
_______________________________________________________________________________________ 5
WIPER TRANSIENT AT POWER-ON
4μs/div
VDD
1V/div
W
1V/div
CL = 10pF
TAP = 128
H = VDD
MAX5422 toc04
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
-40 10-15 356085
END-TO-END RESISTANCE %
CHANGE vs. TEMPERATURE
MAX5422toc05
TEMPERATURE (°C)
END-TO-END RESISTANCE % CHANGE
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
MAX5422 toc06
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
603510-15
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
-40 85
VDD = 5.25V
VDD = 4.0V
VDD = 3.0V
VDD = 2.7V
MAXIMUM WIPER RESISTANCE
vs. TEMPERATURE
MAX5422 toc07
TEMPERATURE (°C)
RESISTANCE (Ω)
603510-15
100
200
300
400
500
600
700
0
-40 85
VDD = 5.25V
VDD = 4.5V
VDD = 3.0V
VDD = 2.7V
Typical Operating Characteristics (continued)
(VDD = 5.0V, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5422 toc08
DIGITAL INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
3421
100
200
300
400
500
600
0
05
THD+N RESPONSE
MAX5422 toc09
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
10
100
0.0001
10 100k
1:1 RATIO
20Hz TO 20kHz BANDPASS
INL vs. TAP POSITION
(MAX5422)
MAX5422 toc10
TAP POSITION
INL (LSB)
224192160128966432
-0.5
0
0.5
1.0
1.5
2.0
-1.0
0256
VARIABLE-RESISTOR MODE
VDD = 2.7V
ISRC = 50μA
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
6 _______________________________________________________________________________________
INL vs. TAP POSITION
(MAX5424)
MAX5422 toc12
TAP POSITION
INL (LSB)
224192160128966432
-0.5
0
0.5
1.0
1.5
2.0
-1.0
0256
VARIABLE-RESISTOR MODE
VDD = 2.7V
ISRC = 10μA
DNL vs. TAP POSITION
(MAX5422)
MAX5422 toc13
TAP POSITION
DNL (LSB)
224192160128966432
-0.2
-0.1
0
0.1
0.2
0.3
-0.3
0256
VARIABLE-RESISTOR MODE
DNL vs. TAP POSITION
(MAX5423)
MAX5422 toc14
TAP POSITION
DNL (LSB)
224192160128966432
-0.2
-0.1
0
0.1
0.2
0.3
-0.3
0256
VARIABLE-RESISTOR MODE
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.3
DNL vs. TAP POSITION
(MAX5424)
MAX5422 toc15
TAP POSITION
DNL (LSB)
2241921601289664320 256
VARIABLE-RESISTOR MODE
Typical Operating Characteristics (continued)
(VDD = 5.0V, TA= +25°C, unless otherwise noted.)
INL vs. TAP POSITION
(MAX5423)
MAX5422 toc11
TAP POSITION
INL (LSB)
224192160128966432
-0.5
0
0.5
1.0
1.5
2.0
-1.0
0 256
VARIABLE-RESISTOR MODE
VDD = 2.7V
ISRC = 20μA
Detailed Description
The MAX5422/MAX5423/MAX5424 contain a resistor
array with 255 resistive elements. The MAX5422 has a
total end-to-end resistance of 50kΩ; the MAX5423 has
an end-to-end resistance of 100kΩ; and the MAX5424
has an end-to-end resistance of 200kΩ. The
MAX5422/MAX5423/MAX5424 allow access to the high,
low, and wiper terminals for a standard voltage-divider
configuration. H, L, and W can be connected in any
desired configuration as long as their voltages fall
between GND and VDD.
A simple, 3-wire, SPI serial interface moves the wiper
among the 256 tap points. The nonvolatile memory
stores the wiper position and recalls the stored wiper
position upon power-up. The nonvolatile memory is
guaranteed for 50 years for wiper data retention and up
to 200,000 wiper store cycles.
Analog Circuitry
The MAX5422/MAX5423/MAX5424 consist of a resistor
array with 255 resistive elements; 256 tap points are
accessible to the wiper, W, along the resistor string
between H and L. Select the wiper tap point by pro-
gramming the potentiometer through the 3-wire (SPI)
interface. Eight data bits, and a control byte program
the wiper position. The H and L terminals of the
MAX5422/MAX5423/MAX5424 are similar to the two
end terminals of a mechanical potentiometer. The
MAX5422/MAX5423/MAX5424 feature power-on reset
circuitry that loads the wiper position from the non-
volatile memory at power-up.
Digital Interface
The MAX5422/MAX5423/MAX5424 use a 3-wire, SPI-
compatible, serial data interface (Figure 1 and 2). This
write-only interface contains three inputs: chip-select
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
_______________________________________________________________________________________ 7
PIN NAME FUNCTION
1V
DD Power-Supply Input. Bypass VDD with a 0.1µF capacitor from VDD to GND.
2 SCLK Serial-Interface Clock Input
3 DIN Serial-Interface Data Input
4CS Active-Low Digital-Input Chip Select
5 GND Ground
6L
Low Terminal. The voltage at L can be greater than or less than the voltage at H. Current can flow into or
out of L.
7 W Wiper Terminal
8H
High Terminal. The voltage at H can be greater than or less than the voltage at L. Current can flow into or
out of H.
— EP Exposed Pad. The exposed pad is not internally connected. Connect to GND or leave floating.
Pin Description
SCLK
CS
DIN
tCS0
tDS
tCL tCH
tDH
tCP tCSH tCS1
tCSW
tCSS
Figure 1. Digital Interface and Timing Diagram
MAX5422/MAX5423/MAX5424
(CS), data clock (SCLK), and data in (DIN). Drive CS
low to enable the serial interface and clock data syn-
chronously 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 and data (Figure
2a). The COPY commands (C1, C0 = 10, 11) can use
either eight clock cycles to transfer the command bits
(Figure 2b) or 16 clock cycles with 8 data bits that are
disregarded by the device (Figure 2a).
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.
The serial-data timing for the potentiometer is shown in
Figures 1 and 2.
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
8 _______________________________________________________________________________________
CLOCK EDGE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Bit name — — C1 C0 — — — — D7 D6 D5 D4 D3 D2 D1 D0
Write wiper register 0 0 0 0 0 0 0 0 D7 D6 D5 D4 D3 D2 D1 D0
Write NV register 0 0 0 1 0 0 0 0 D7 D6 D5 D4 D3 D2 D1 D0
Copy wiper register to NV
register 00100000————————
Copy NV register to wiper
register 00110000————————
Table 1. Register Map
1 2 3 4 5 6 7 8 9 10111213141516
D7 D6 D5 D4 D3 D2 D1 D0C1 C0
SCLK
DIN
A) 16-BIT COMMAND/DATA WORD
12345678
C1 C0
SCLK
DIN
B) 8-BIT COMMAND WORD
CS
CS
Figure 2. Digital-Interface Format
Write Wiper Register
Data written to this register (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 random
access memory (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
The “write NV register” 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 writes to the NV register. Writing to the
NV registers, does not affect the position of the wipers.
Copy Wiper Register to NV Register
The “copy wiper register to NV register” command (C1,
C0 = 10) stores the current position of the wiper to the
NV register for use at power-up.
Copy NV Register to Wiper Register
The “copy NV register to wiper register” (C1, C0 = 11)
restores the wiper position to the current value stored in
the NV register.
Standby Mode
The MAX5422/MAX5423/MAX5424 feature a low-power
standby mode. When the device is not being pro-
grammed, it enters into standby mode and supply cur-
rent drops to 0.5µA (typ).
Nonvolatile Memory
The internal EEPROM consists of a nonvolatile register
that retains the last value stored prior to power-down.
The nonvolatile register is programmed to midscale at
the factory. The nonvolatile memory is guaranteed for
50 years for wiper data retention and up to 200,000
wiper write cycles.
Power-Up
Upon power-up, the MAX5422/MAX5423/MAX5424
load the data stored in the nonvolatile wiper register
into the volatile wiper register, updating the wiper posi-
tion with the data stored in the nonvolatile wiper regis-
ter. This initialization period takes 10µs.
Applications Information
The MAX5422/MAX5423/MAX5424 are intended for cir-
cuits requiring digitally controlled adjustable resis-
tance, such as LCD contrast control (where voltage
biasing adjusts the display contrast), or programmable
filters with adjustable gain and/or cutoff frequency.
Positive LCD Bias Control
Figures 3 and 4 show an application where a voltage-
divider or variable resistor is used to make an
adjustable, positive LCD-bias voltage. The op amp pro-
vides buffering and gain to the resistor-divider network
made by the potentiometer (Figure 3) or to a fixed
resistor and a variable resistor (see Figure 4).
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
_______________________________________________________________________________________ 9
VOUT
30V
5V
W
H
L
MAX5422
MAX5423
MAX5424
Figure 3. Positive LCD-Bias Control Using a Voltage-Divider
VOUT
30V
5V
W
H
L
MAX5422
MAX5423
MAX5424
Figure 4. Positive LCD-Bias Control Using a Variable Resistor
MAX5422/MAX5423/MAX5424
Programmable Filter
Figure 5 shows the configuration for a 1st-order pro-
grammable filter. The gain of the filter is adjusted by
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the DC gain (G) and
the 3dB cutoff frequency (fC):
Adjustable Voltage Reference
Figure 6 shows the MAX5422/MAX5423/MAX5424 used
as the feedback resistors in an adjustable voltage-ref-
erence application. Independently adjust the output
voltage of the MAX6160 from 1.23V to VIN - 0.2V by
changing the wiper position of the MAX5422/
MAX5423/MAX5424.
Offset Voltage and Gain Adjustment
Connect the high and low terminals of one potentiome-
ter of a MAX5422/MAX5423/MAX5424 between the
NULL inputs of a MAX410 and the wiper to the op
amp’s positive supply to nullify the offset voltage over
the operating temperature range. Install another
MAX5422/MAX5423/MAX5424 potentiometer in the
feedback path to adjust the gain of the MAX410 (see
Figure 7).
GR
R
f
RC
C
=+
=
π× ×
11
2
1
23
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
10 ______________________________________________________________________________________
VOUT
R1
W
H
L
W
H
L
MAX5422
MAX5423
MAX5424
R2
R3
VIN
C
Figure 5. Programmable Filter
W
H
L
MAX6160
MAX5422
MAX5423
MAX5424
+5V
GND
VIN
OUT
ADJ
V0 REF
V0 = 1.23V 200kΩ FOR THE MAX5424
R2(kΩ)
V0 = 1.23V 100kΩ FOR THE MAX5423
R2(kΩ)
V0 = 1.23V 50kΩ FOR THE MAX5422
R2(kΩ)
Figure 6. Adjustable Voltage Reference
6
8
1
7
2
3
5V
-5V
MAX5422
MAX410
4
Figure 7. Offset Voltage Adjustment Circuit
Chip Information
TRANSISTOR COUNT: 10,191
PROCESS: BiCMOS
MAX5422/MAX5423/MAX5424
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
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 ____________________ 11
© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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.)
6, 8, &10L, DFN THIN.EPS
COMMON DIMENSIONS
SYMBOL MIN. MAX.
A 0.70 0.80
D 2.90 3.10
E 2.90 3.10
A1 0.00 0.05
L 0.20 0.40
PKG. CODE N D2 E2 eJEDEC SPEC b[(N/2)-1] x e
PACKAGE VARIATIONS
0.25 MIN.k
A2 0.20 REF.
2.00 REF0.25±0.050.50 BSC2.30±0.1010T1033-1
2.40 REF0.20±0.05- - - - 0.40 BSC1.70±0.10 2.30±0.1014T1433-1
1.50±0.10 MO229 / WEED-3
0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10
T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF
T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010T1033-2
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MAX5422ETA+T MAX5423ETA+T MAX5424ETA+T MAX5417PETA+