MAX5436 MAXIM [Maxim Integrated Products], MAX5436 Datasheet

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MAX5436

Manufacturer Part Number
MAX5436
Description
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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The MAX5436–MAX5439 are 128-tap high-voltage (±5V
to ±15V) digital potentiometers in packages that are half
the size of comparable devices in 8-pin SO. They perform
the same function as mechanical potentiometers, but
replace the mechanics with a simple digital interface. The
digital logic is powered by a separate single +2.7V to
+5.25V supply voltage (V
own analog supplies (V
V
allows for greater flexibility in voltage ranges that can be
used with these devices. Examples of analog supply
ranges include not only dual voltages of ±5V to ±15V, but
single-supply voltages, such as +10V, +15V, +30V, -30V,
and more, as long as the ranges of V
V
The MAX5437/MAX5439 include an on-chip, high-
voltage, uncommitted amplifier, providing additional
reductions in board space and cost. Other features
include low 35ppm/°C end-to-end and 5ppm/°C ratio-
metric resistor temperature coefficients, a 3-wire SPI™/
QSPI™/MICROWIRE™-compatible serial interface, and
a power-on reset to midscale.
The MAX5436/MAX5438 are available in 10-pin µMAX
packages. The MAX5437/MAX5439 are available in 14-
pin TSSOP package. Each device is guaranteed over
the extended temperature range of -40°C to +85°C.
19-2657; Rev 3; 9/04
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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.
±15V, 128-Tap, Low-Drift Digital Potentiometers
DD
SS
are met.
- V
LCD Screen Contrast Adjustment
Data-Acquisition Systems
Mechanical Potentiometer Replacement
Low-Drift Programmable Gain Amplifier
Audio Volume Control
SS
to be greater than 9V and less than 31.5V. This
________________________________________________________________ Maxim Integrated Products
General Description
CC
DD
). The resistor string uses its
and V
Applications
DD
SS
- V
) that require
SS
and V
CC
-
MAX5436EUB
MAX5437EUD
MAX5438EUB
MAX5439EUD
TOP VIEW
SCLK
+10V to +30V Single-Supply Operation
-28V to -10V Single Negative Supply Operation
±5V to ±15V Dual-Supply Operation
128 Tap Positions
Uncommitted High-Voltage Amplifier
(MAX5437/MAX5439)
Low Temperature Coefficient
35ppm/°C (End-to-End)
5ppm/°C (Ratiometric)
Small-Footprint Packages
Glitchless Switching Between the Resistor Taps
3-Wire SPI/QSPI/MICROWIRE-Compatible Serial
Interface
50kΩ/100kΩ End-to-End Resistances
Power-On Reset: Wiper Goes to Midscale
(Position 64)
GND
DIN
V
CS
SS
10-Pin µMAX (MAX5436/MAX5438)
14-Pin TSSOP (MAX5437/MAX5439)
PART
1
2
3
4
5
MAX5438
MAX5436
µMAX
-40°C to +85°C 10 µMAX
-40°C to +85°C 14 TSSOP
-40°C to +85°C 10 µMAX
-40°C to +85°C 14 TSSOP
TEMP RANGE
Ordering Information
10
9
8
7
6
V
L
W
H
V
CC
DD
Pin Configurations
SHDN
SCLK
GND
OUT
PIN-
PACKAGE
DIN
V
CS
SS
1
4
5
6
7
2
3
MAX5437
MAX5439
TSSOP
Features
RESISTANCE
(k )
100
100
50
50
14
13
12
11
10
9
8
V
L
W
H
V
IN+
IN-
CC
DD
1

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MAX5436 Summary of contents

Page 1

... SPI™/ QSPI™/MICROWIRE™-compatible serial interface, and a power-on reset to midscale. The MAX5436/MAX5438 are available in 10-pin µMAX packages. The MAX5437/MAX5439 are available in 14- pin TSSOP package. Each device is guaranteed over the extended temperature range of -40°C to +85°C. ...

Page 2

... Typical values are CONDITIONS N 2 INL (Note 1) (Note 50kΩ (MAX5436/MAX5437 50kΩ (MAX5436/MAX5437 100kΩ (MAX5438/MAX5439 100kΩ (MAX5438/MAX5439 INL (Note 2) (Note 2) W (Note ...

Page 3

Low-Drift Digital Potentiometers ELECTRICAL CHARACTERISTICS (continued +15V -15V +5V +25°C, unless otherwise noted.) A PARAMETER SYMBOL Input High Voltage Input Low Voltage Input Leakage Current Input ...

Page 4

... CONDITIONS (Note 4) CC MAX5436/MAX5438 SHDN = GND for MAX5437/MAX5439 DD SHDN = V CC MAX5436/MAX5438 SHDN = GND for MAX5437/MAX5439 SS SHDN = V CC Typical Operating Characteristics = +25°C, unless otherwise noted WIPER RESISTANCE vs. INPUT CODE 1100 1075 CONDITIONS OF NOTE 2 ...

Page 5

... V = -15V +5V END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE 0.15 0.10 0.05 0 50kΩ -0.05 -0.10 100kΩ -0.15 -0.20 -0.25 -40 - TEMPERATURE (°C) MIDSCALE SWITCHING TRANSIENT (CODE 63 TO CODE 64) MAX5436 toc07 CS 2V/div V W-L 100mV/div C = 20pF WIPER 100ns/div VARIABLE-RESISTOR INL vs. INPUT CODE (50k ) Ω 0.30 CONDITIONS OF NOTE 2 0.25 0.20 0.15 0.10 0.05 0 -0.05 -0. ...

Page 6

Low-Drift Digital Potentiometers (V = +15V -15V +5V VOLTAGE-DIVIDER DNL vs. INPUT CODE (100k ) Ω 0.010 0.008 0.006 0.004 0.002 0 -0.002 -0.004 -0.006 -0.008 -0.010 0 16 ...

Page 7

... The MAX5436–MAX5439 are ideal for LCDs that require separate voltage for contrast control in addition to the main supply voltage. Figure 5a shows the MAX5436– MAX5439 being used for LCD contrast control along with the MAX629, which provides the LCD supply voltage. A similar circuit with an additional buffer circuit is shown in Figure 5b ...

Page 8

Low-Drift Digital Potentiometers Don’t Care (MSB) First Bit Loaded Figure 1. Serial Data Format CS SCLK MSB LOADED DIN D7 D6 MSB TIME Figure 2. Serial Interface Timing Diagram CS t CSS t CSO SCLK ...

Page 9

... CONTROL MAX629 Figure 5b. Simplified LCD Contrast Control Circuit with Buffer _______________________________________________________________________________________ FIXED ±28V IN V OUT (LCD BIAS) MAX5436– ±16V TO ±26V CONTRAST ADJUST MAX5439 MICROCONTROLLER/MICROPROCESSOR V OUT (LCD BIAS) MAX5437/ MAX5439 LCD PANEL FIXED ±28V IN LCD PANEL ±16V TO ±26V CONTRAST ADJUST ...

Page 10

... LATCH SHIFT REGISTER DIN SCLK POR CLOCK LOGIC CS GND 10 ______________________________________________________________________________________ 128 W REGISTER DIN MAX5436/ SCLK MAX5438 CS TRANSISTOR COUNT: 2556 PROCESS: BiCMOS Functional Diagrams R R 128 7 7-BIT 7 DECODE 7-BIT LATCH SHIFT MAX5437/ MAX5439 POR CLOCK LOGIC GND IN+ IN- ...

Page 11

Low-Drift Digital Potentiometers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages 0.50±0.1 0.6±0.1 1 0.6±0.1 TOP VIEW ...

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