MAX5422ETA [MAXIM]
256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers; 256抽头，非易失， SPI接口，数字电位器
| 型号： | MAX5422ETA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 256-Tap, Nonvolatile, SPI-Interface, Digital Potentiometers |
| 文件： | 总11页 (文件大小：612K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3371; Rev 0; 7/04
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
General Description
Features
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.
ꢀ 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 200kΩ Resistor Values
ꢀ 5MHz SPI-Compatible Serial Interface
ꢀ 500nA (typ) Static Supply Current
ꢀ Single-Supply Operation: +2.7V to +5.25V
ꢀ 256 Tap Positions
ꢀ
ꢀ
0.5 ꢀSꢁ DNꢀ in Voltage-Divider Mode
0.5 ꢀSꢁ INꢀ in Voltage-Divider Mode
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.
SPI is a trademark of Motorola, Inc.
Applications
Mechanical Potentiometer Replacement
Low-Drift Programmable Gain Amplifiers
Audio Volume Control
Pin Configuration
TOP VIEW
V
Liquid-Crystal Display (LCD) Contrast Control
Low-Drift Programmable Filters
1
2
3
4
8
7
6
5
H
DD
Functional Diagram
SCLK
DIN
CS
W
MAX5422
MAX5423
MAX5424
L
H
GND
8-BIT
SHIFT
REGISTER
256-
POSITION
DECODER
256
8
8
8-BIT
LATCH
W
L
V
DD
GND
TDFN (3mm x 3mm)
CS
SCLK
DIN
POR
MAX5422
MAX5423
MAX5424
SPI
INTERFACE
8-BIT
NV
MEMORY
Ordering Information/Selector Guide
END-TO-END
RESISTANCE (kΩ)
PART
TEMP RANGE
PIN-PACKAGE
TOP MARK
8 TDFN-EP*
8 TDFN-EP*
8 TDFN-EP*
MAX5422ETA
MAX5423ETA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
50
AIJ
AII
100
200
MAX5424ETA
AIH
*EP = Exposed pad.
________________________________________________________________ Maxim Integrated Products
1
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.
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
ABSOLUTE MAXIMUM RATINGS
DD
All Other Pins to GND.................................-0.3V to (V
Maximum Continuous Current into H, L, and W
MAX5422...................................................................... 1.3mA
MAX5423...................................................................... 0.6mA
MAX5424...................................................................... 0.3mA
V
to GND...........................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
+ 0.3V)
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
DD
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.
ELECTRICAL CHARACTERISTICS
(V = +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V = +5.0V, T = +25°C, unless otherwise noted.)
DD
DD
A
DD
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE (VOLTAGE-DIVIDER MODE)
Resolution
N
256
Taps
LSB
LSB
Integral Nonlinearity
Differential Nonlinearity
INL
DNL
(Note 1)
(Note 1)
0.5
0.5
End-to-End Resistance
Temperature Coefficient
TC
35
5
ppm/°C
ppm/°C
R
Ratiometric Resistance
Temperature Coefficient
MAX5422
MAX5423
MAX5424
MAX5422
MAX5423
MAX5424
-0.6
-0.3
-0.15
0.7
Full-Scale Error
Zero-Scale Error
LSB
LSB
0.35
0.18
DC PERFORMANCE (VARIABLE-RESISTOR MODE)
V
V
= 3V
= 5V
3.0
1.5
DD
DD
Integral Nonlinearity
(Note 2)
INL
LSB
LSB
V
= 3V, MAX5422, -40°C ≤ T ≤ +85°C,
A
DD
-1.0
-1.0
+2.0
+1.2
guaranteed monotonic
V
= 3V, MAX5422, 0°C ≤ T ≤ +85°C,
DD
A
Differential Nonlinearity
(Note 2)
guaranteed monotonic
DNL
V
V
V
= 3V, MAX5423
= 3V, MAX5424
= 5V
1.0
1.0
1.0
DD
DD
DD
DC PERFORMANCE (RESISTOR CHARACTERISTICS)
Wiper Resistance
Wiper Capacitance
R
W
C
W
V
= 3V to 5.25V (Note 3)
DD
325
10
675
Ω
pF
MAX5422
MAX5423
MAX5424
37.5
75
50
62.5
125
250
End-to-End Resistance
100
200
kΩ
150
2
_______________________________________________________________________________________
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V = +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V = +5.0V, T = +25°C, unless otherwise noted.)
DD
DD
A
DD
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS (CS, DIN, SCLK)
V
V
= 3.4V to 5.25V
2.4
DD
DD
Input High Voltage (Note 4)
V
V
V
IH
0.7 x
< 3.4V
V
DD
Input Low Voltage
V
V
= 2.7V to 5.25V (Note 4)
0.8
1
IL
DD
Input Leakage Current
Input Capacitance
I
0.1
5
µA
pF
IN
C
IN
DYNAMIC CHARACTERISTICS
MAX5422
MAX5423
MAX5424
100
50
Wiper -3dB Bandwidth (Note 5)
kHz
25
NONVOLATILE MEMORY RELIABILITY
Data Retention
T
A
T
A
T
A
= +85°C
= +25°C
= +85°C
50
Years
200,000
50,000
Endurance
Stores
POWER SUPPLY
Supply Voltage
Standby Current
V
2.70
5.25
1
V
DD
I
Digital inputs = V
or GND, T = +25°C
0.5
µA
DD
DD
A
During nonvolatile write to memory; digital
inputs = V or GND (Note 6)
Programming Current
I
200
400
µA
PG
DD
TIMING CHARACTERISTICS
(V
= +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V
= +5.0V, T = +25°C, unless otherwise
DD A
DD
DD
A
noted. See Figure 1.) (Note 7)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG SECTION
MAX5422
MAX5423
MAX5424
400
600
Wiper Settling Time (Note 8)
t
ns
S
1000
DIGITAL SECTION
SCLK Frequency
f
5
MHz
ns
SCLK
SCLK Clock Period
t
200
80
80
80
0
CP
SCLK Pulse-Width High
SCLK Pulse-Width Low
CS Fall to SCLK Rise Setup
SCLK Rise to CS Rise Hold
DIN to SCLK Setup
t
ns
CH
t
ns
CL
t
ns
CSS
CSH
t
ns
t
50
ns
DS
_______________________________________________________________________________________
3
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
TIMING CHARACTERISTICS (continued)
(V
= +2.7V to +5.25V, H = V , L = GND, T = -40°C to +85°C. Typical values are at V
= +5.0V, T = +25°C, unless otherwise
DD A
DD
DD
A
noted. See Figure 1.) (Note 7)
PARAMETER
DIN Hold after SCLK
SYMBOL
CONDITIONS
MIN
0
TYP
MAX
UNITS
ns
t
DH
SCLK Rise to CS Fall Delay
CS Rise to SCLK Rise Hold
CS Pulse-Width High
t
t
20
ns
CS0
CS1
80
ns
t
200
ns
CSW
Write NV Register Busy Time
t
12
ms
BUSY
Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V
and L = GND. The
DD
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 50kΩ configuration, 40µA for the
100kΩ configuration, and 20µA for the 200kΩ configuration. For the 3V condition, the wiper terminal is driven with a source
current of 40µA for the 50kΩ configuration, 20µA for the 100kΩ, and 10µA for the 200kΩ configuration.
Note 3: The wiper resistance is measured using the source currents given in Note 2. For operation to V
Wiper Resistance vs. Temperature in the Typical Operating Characteristics.
= 2.7V, see Maximum
DD
Note 4: The device draws higher supply current when the digital inputs are driven with voltages between (V
0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.
- 0.5V) and (GND +
DD
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 = V , L =
DD
GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe.
Typical Operating Characteristics
(V
= 5.0V, T = +25°C, unless otherwise noted.)
DD
A
DNL vs. TAP POSITION
INL vs. TAP POSITION
WIPER RESISTANCE vs. TAP POSITION
0.25
0.20
0.15
0.10
0.05
0
0.25
700
600
500
400
300
200
100
0
VOLTAGE-DIVIDER MODE
VOLTAGE-DIVIDER MODE
V
I
= 2.7V
= 50µA
DD
SRC
0.20
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
-0.05
-0.10
-0.15
-0.20
-0.25
0
32 64 96 128 160 192 224 256
TAP POSITION
0
32 64 96 128 160 192 224 256
TAP POSITION
0
32 64 96 128 160 192 224 256
TAP POSITION
4
_______________________________________________________________________________________
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
Typical Operating Characteristics (continued)
(V
= 5.0V, T = +25°C, unless otherwise noted.)
DD
A
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
END-TO-END RESISTANCE %
CHANGE vs. TEMPERATURE
WIPER TRANSIENT AT POWER-ON
MAX5422 toc04
1.0
0.8
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
DD
1V/div
0.6
0.4
0.2
V
= 5.25V
DD
0
-0.2
-0.4
-0.6
-0.8
-1.0
W
1V/div
V
V
= 4.0V
= 3.0V
DD
DD
C = 10pF
L
TAP = 128
H = V
DD
V
= 2.7V
DD
60
-40
-15
10
35
85
4µs/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAXIMUM WIPER RESISTANCE
vs. TEMPERATURE
600
700
600
500
400
300
200
100
0
500
V
= 2.7V
DD
400
300
200
100
0
V
DD
V
DD
V
DD
= 3.0V
= 4.5V
= 5.25V
0
1
2
3
4
5
-40
-15
10
35
60
85
DIGITAL INPUT VOLTAGE (V)
TEMPERATURE (°C)
THD+N RESPONSE
INL vs. TAP POSITION
(MAX5422)
100
10
1:1 RATIO
20Hz TO 20kHz BANDPASS
2.0
1.5
1.0
0.5
0
VARIABLE-RESISTOR MODE
V
SRC
= 2.7V
= 50µA
DD
I
1
0.1
0.01
0.001
0.0001
-0.5
-1.0
10
100
1k
10k
100k
0
32 64 96 128 160 192 224 256
TAP POSITION
FREQUENCY (Hz)
_______________________________________________________________________________________
5
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
Typical Operating Characteristics (continued)
(V
= 5.0V, T = +25°C, unless otherwise noted.)
DD
A
INL vs. TAP POSITION
(MAX5423)
INL vs. TAP POSITION
(MAX5424)
DNL vs. TAP POSITION
(MAX5422)
2.0
1.5
2.0
1.5
1.0
0.5
0
0.3
0.2
0.1
0
VARIABLE-RESISTOR MODE
VARIABLE-RESISTOR MODE
VARIABLE-RESISTOR MODE
V
SRC
= 2.7V
= 20µA
V
SRC
= 2.7V
= 10µA
DD
DD
I
I
1.0
0.5
0
-0.1
-0.2
-0.3
-0.5
-1.0
-0.5
-1.0
0
32 64 96 128 160 192 224 256
TAP POSITION
0
32 64 96 128 160 192 224 256
TAP POSITION
0
32 64 96 128 160 192 224 256
TAP POSITION
DNL vs. TAP POSITION
(MAX5423)
DNL vs. TAP POSITION
(MAX5424)
0.3
0.2
0.1
0
0.5
VARIABLE-RESISTOR MODE
VARIABLE-RESISTOR MODE
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.1
-0.2
-0.3
0
32 64 96 128 160 192 224 256
TAP POSITION
0
32 64 96 128 160 192 224 256
TAP POSITION
6
_______________________________________________________________________________________
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
Pin Description
PIN
1
NAME
FUNCTION
V
Power-Supply Input. Bypass V
Serial-Interface Clock Input
Serial-Interface Data Input
with a 0.1µF capacitor from V
to GND.
DD
DD
DD
2
SCLK
DIN
3
4
CS
Active-Low Digital-Input Chip Select
Ground
5
GND
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.
6
7
L
W
H
Wiper Terminal
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.
8
—
EP
Exposed Pad. The exposed pad is not internally connected. Connect to GND or leave floating.
CS
SCLK
DIN
t
t
CSW
CS0
t
CS1
t
t
CH
t
CP
t
CL
CSH
t
CSS
t
t
DH
DS
Figure 1. Digital Interface and Timing Diagram
Analog Circuitry
Detailed Description
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.
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 V
.
DD
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.
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
_______________________________________________________________________________________
7
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
(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.
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 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).
The serial-data timing for the potentiometer is shown in
Figures 1 and 2.
Table 1. Register Map
CLOCK EDGE
Bit name
1
—
0
2
—
0
3
C1
0
4
C0
0
5
—
0
6
—
0
7
—
0
8
—
0
9
10
D6
D6
D6
11
D5
D5
D5
12
D4
D4
D4
13
D3
D3
D3
14
D2
D2
D2
15
D1
D1
D1
16
D0
D0
D0
D7
D7
D7
Write wiper register
Write NV register
0
0
0
1
0
0
0
0
Copy wiper register to NV
register
0
0
0
0
1
1
0
1
0
0
0
0
0
0
0
0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Copy NV register to wiper
register
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
D7
D6
D5
D4
D3
D2
D1
D0
B) 8-BIT COMMAND WORD
CS
SCLK
1
2
3
4
5
6
7
8
DIN
C1
C0
Figure 2. Digital-Interface Format
8
_______________________________________________________________________________________
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
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.
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.
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.
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.
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.
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.
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.
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).
Standby Mode
The MAX5422/MAX5423/MAX5424 feature a low-power
standby mode. When the device is not being pro-
5V
5V
H
30V
30V
W
MAX5422
V
OUT
MAX5423
H
L
V
OUT
MAX5424
L
MAX5422
MAX5423
MAX5424
W
Figure 3. Positive LCD-Bias Control Using a Voltage-Divider
Figure 4. Positive LCD-Bias Control Using a Variable Resistor
_______________________________________________________________________________________
9
256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
Programmable Filter
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
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
voltage of the MAX6160 from 1.23V to V - 0.2V by
IN
changing the wiper position of the MAX5422/
MAX5423/MAX5424.
the 3dB cutoff frequency (f ):
C
R1
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).
G = 1 +
R2
1
f
=
C
2π × R3 × C
C
V
IN
5V
V
OUT
H
L
MAX5422
R3
R1
W
7
1
2
3
H
L
8
6
MAX410
R2
MAX5422
MAX5423
MAX5424
W
4
-5V
Figure 7. Offset Voltage Adjustment Circuit
Figure 5. Programmable Filter
+5V
Chip Information
TRANSISTOR COUNT: 10,191
V
IN
PROCESS: BiCMOS
V REF
0
OUT
ADJ
H
L
MAX6160
W
GND
MAX5422
MAX5423
MAX5424
50kΩ
2
V = 1.23V
FOR THE MAX5422
FOR THE MAX5423
FOR THE MAX5424
0
R (kΩ)
100kΩ
V = 1.23V
0
R (kΩ)
2
200kΩ
V = 1.23V
0
R (kΩ)
2
Figure 6. Adjustable Voltage Reference
10 ______________________________________________________________________________________
256-Tap, Nonvolatile, SPI-Interface,
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.)
D
N
PIN 1
INDEX
AREA
E
E2
DETAIL A
C
C
L
L
L
L
A
e
e
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
21-0137
F
2
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
0.80
3.10
3.10
0.05
0.40
A
D
E
A1
L
k
0.25 MIN.
0.20 REF.
A2
PACKAGE VARIATIONS
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
1.50 0.10 2.30 0.10 0.95 BSC
1.50 0.10 2.30 0.10 0.65 BSC
MO229 / WEEA
MO229 / WEEC
0.40 0.05
0.30 0.05
1.90 REF
1.95 REF
2.00 REF
2.40 REF
2.40 REF
T833-1
8
T1033-1
T1433-1
T1433-2
10
14
14
1.50 0.10 2.30 0.10 0.50 BSC MO229 / WEED-3 0.25 0.05
1.70 0.10 2.30 0.10 0.40 BSC
1.70 0.10 2.30 0.10 0.40 BSC
- - - -
- - - -
0.20 0.03
0.20 0.03
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
21-0137
F
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 ____________________ 11
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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