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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 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
________________________________________________________________ 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.
Datasheet pdf - http://www.DataSheet4U.net/
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Digitally Programmable Precision Voltage Divider for PGAs MAX5420/MAX5421
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V VSS to GND...............................................................+0.3V to -6V D0, D1 to GND ...........................................-0.3V to (VDD + 0.3V) H, L, W, MATCH_ to GND ................(VSS - 0.3V) to (VDD + 0.3V) Input and Output Latchup Immunity.................................±50mA Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 4.1mW/°C above +70°C) .............333mW 10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW Operating Tempera.