Digitally Programmable Precision Voltage Divider - Maxim Integrated Products
Description
www.
DataSheet.
co.
kr
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 programmable 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 BiasCurrent 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
MAX5420/MAX5421
Applications
General-Purpose Programmable Noninverting Amplifiers Programmable Instrumentation Amplifiers
Ordering Information
PART TEMP RANGE -40°C to +85°C PINPACKAGE 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%
MAX5420AEUA -40°C to +85°C MAX5420BEUA MAX5420CEUA -40°C to +85°C MAX5421AEUB -40°C to +85°C MAX5421BEUB -40°C to +85°C MAX5421CEUB -40°C to +85°C
Functional Diagram
TOP VIEW
VDD 1 2
Pin Configurations
8 7
H W L D1
VDD MAX5420 MAX5421 D0 DECODER D1 MATCH_H MATCH_L
H
VSS GND
MAX5420
3 6 5
W
D0 4
µMAX-8
VDD 1
10 H 9 W L MATCH_H MATCH_L
VSS GND L MAX5421 ONLY
VSS GND D0 D1
2 3 4 5
MAX5421
8 7 6
µMAX-10
_______________...
Similar Datasheet
