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| MAX5420 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Digitally Programmable Precision Voltage Divider for PGAs | |||
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19-2229; Rev 1; 7/03
Digitally Programmable Precision
Voltage Divider for PGAs
General Description
The MAX5420 and MAX5421 are digitally programmable
precision voltage dividers optimized for use in digitally pro-
grammable gain amplifier configurations. The MAX5420/
MAX5421 operate from a single +5V supply or dual ±5V
supply, and consume only 3µA supply current. These
devices consist of a digitally selectable resistor array that
provides four precision noninverting gains of 1, 2, 4, and 8
for PGAs. The MAX5420 and MAX5421 achieve a resistor
ratio accuracy of 0.025% (MAX542_A), 0.09% (MAX542_B),
and 0.5% (MAX542_C). The MAX5421 includes an on-chip
matching resistor for op amp bias-current compensation.
The MAX5420 and MAX5421 are available in 8-pin and
10-pin µMAX packages. The devices are specified over
the extended temperature range (-40°C to +85°C).
Features
o Four Precision Divider Ratios For Noninverting
Gains of 1, 2, 4, and 8 in PGAs
o 0.025%, 0.09%, or 0.5% Ratio Accuracy
Guaranteed Over -40°C to +85°C
o On-Chip Matching Resistor for Op Amp Bias-
Current Compensation (MAX5421)
o 5V Single or ±5V Dual Supply Operation
o Low 3µA Supply Current
o CMOS/TTL Logic Compatible 2-Wire Parallel
Interface
o Small 8-Pin and 10-Pin µMAX Packages
Applications
General-Purpose Programmable Noninverting
Amplifiers
Programmable Instrumentation Amplifiers
Functional Diagram
Ordering Information
PART
TEMP
RANGE
MAX5420AEUA -40°C to +85°C
MAX5420BEUA -40°C to +85°C
MAX5420CEUA -40°C to +85°C
MAX5421AEUB -40°C to +85°C
MAX5421BEUB -40°C to +85°C
MAX5421CEUB -40°C to +85°C
PIN-
PACKAGE
8 µMAX
8 µMAX
8 µMAX
10 µMAX
10 µMAX
10 µMAX
GAIN
ACCURACY
0.025%
0.09%
0.5%
0.025%
0.09%
0.5%
Pin Configurations
TOP VIEW
VDD
H
MAX5420
MAX5421
W
D0
DECODER
D1
MATCH_H
MATCH_L
MAX5421 ONLY
VSS GND L
VDD 1
VSS 2
GND 3
D0 4
MAX5420
8H
7W
6L
5 D1
µMAX-8
VDD 1
VSS 2
GND 3
D0 4
D1 5
MAX5421
10 H
9W
8L
7 MATCH_H
6 MATCH_L
µMAX-10
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maximâs website at www.maxim-ic.com.
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