Datasheet

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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).

Applications

General-Purpose Programmable Noninverting

Amplifiers

Programmable Instrumentation Amplifiers

Features

♦ Four Precision Divider Ratios For Noninverting

Gains of 1, 2, 4, and 8 in PGAs

♦ 0.025%, 0.09%, or 0.5% Ratio Accuracy

Guaranteed Over -40°C to +85°C

♦ On-Chip Matching Resistor for Op Amp Bias-

Current Compensation (MAX5421)

♦ 5V Single or ±5V Dual Supply Operation

♦ Low 3µA Supply Current

♦ CMOS/TTL Logic Compatible 2-Wire Parallel

Interface

♦ Small 8-Pin and 10-Pin µMAX Packages

MAX5420/MAX5421

Digitally Programmable Precision

Voltage Divider for PGAs

________________________________________________________________ Maxim Integrated Products 1

D1D0

GND

µMAX-8

TOP VIEW

MAX5420

MATCH_HD0

GND

MAX5421

µMAX-10

MATCH_LD1

Pin Configurations

Ordering Information

Functional Diagram

19-2230; Rev 2; 2/05

PART

TEMP.

RANGE

PIN-

PACKAGE

GAIN

ACCURACY

MAX5420AEUA -40°C to +85°C 8 µMAX 0.025%

MAX5420BEUA -40°C to +85°C 8 µMAX 0.09%

MAX5420CEUA -40°C to +85°C 8 µMAX 0.5%

MAX5421AEUB -40°C to +85°C 10 µMAX 0.025%

MAX5421BEUB -40°C to +85°C 10 µMAX 0.09%

MAX5421CEUB -40°C to +85°C 10 µMAX 0.5%

DECODER

MATCH_H

MATCH_L

MAX5421 ONLY

GND

MAX5420

MAX5421

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.

Summary of content (9 pages)

PAGE 1
9-2230; Rev 2; 2/05 Digitally Programmable Precision Voltage Divider for PGAs Features ♦ Four Precision Divider Ratios For Noninverting Gains of 1, 2, 4, and 8 in PGAs ♦ 0.025%, 0.09%, or 0.
PAGE 2
MAX5420/MAX5421 Digitally Programmable Precision Voltage Divider for PGAs 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.................................
PAGE 3
Digitally Programmable Precision Voltage Divider for PGAs (VDD = +5V ±5%, VSS = -5V ±5% or VSS = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES Positive Supply Voltage VDD 4.75 5.25 Negative Supply Voltage VSS 0 -5.
PAGE 4
MAX5420/MAX5421 Digitally Programmable Precision Voltage Divider for PGAs Typical Operating Characteristics (continued) (VDD = +5V, VSS = -5V, or VSS = GND, TA = +25°C, unless otherwise noted.) (Note 1) VH = +5V VL = -5V RATIO = 1 0.004 0.003 0.002 0.0015 VH = +5V VL = -5V RATIO = 2 -0.0225 RATIO ACCURACY (%) RATIO ACCURACY (%) RATIO ACCURACY (%) 0.005 -0.0200 MAX5420/21 toc05 VH = +5V VL = -5V RATIO = 8 0.006 0.0020 MAX5420/21 toc04 0.007 MAX542_B DIVIDER RATIO ACCURACY vs.
PAGE 5
Digitally Programmable Precision Voltage Divider for PGAs SWITCHING TIME (RATIO 2-TO-4) SWITCHING TIME (RATIO 1-TO-2) MAX5420/21 toc14 MAX5420/21 toc13 D0, 5V/div 0 D1, 5V/div 0 VW 2V/div VW 1V/div 100ns/div VH = +5V, VL = -5V 100ns/div VH = +5V, VL = -5V SUPPLY CURRENT vs.
PAGE 6
MAX5420/MAX5421 Digitally Programmable Precision Voltage Divider for PGAs Pin Description PIN NAME FUNCTION MAX5420 MAX5421 1 1 VDD Positive Supply Voltage 2 2 VSS Negative Supply Voltage 3 3 GND Ground 4, 5 4, 5 D0, D1 6 8 L 7 9 W Resistor-Divider Output 8 10 H High Terminal of Resistor-Divider — 6 MATCH_L Matching Resistor Low Terminal — 7 MATCH_H Matching Resistor High Terminal Digital Control Inputs.
PAGE 7
Digitally Programmable Precision Voltage Divider for PGAs VDD RATIO = 1 +5V MATCH_H MATCH_L VIN VOUT MAX5421 MAX4493 L R2B R3B MAX5420/MAX5421 +5V H H R1B GND VSS W RATIO = 2 RATIO = 4 RATIO = 8 W R3A R2A Figure 3. Programmable-Gain Amplifier with Op Amp BiasCurrent Matching R1A +5V ( RATIO = 1+ R_B R_A VIN ) MAX4237 VOUT L +5V Figure 1. Simplified Functional Diagram VDD W H +5V 0.1µF MAX5420 VDD H VSS RATIO = 1 R2B R3B L GND Figure 4.
PAGE 8
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.) 4X S 8 8 INCHES DIM A A1 A2 b E Ø0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6° 0° 0.0207 BSC 8LUMAXD.
PAGE 9
Digitally Programmable Precision Voltage Divider for PGAs 10LUMAX.EPS e 4X S 10 10 INCHES H Ø0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 0.120 D1 0.116 0.118 0.114 D2 0.116 0.120 E1 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S α 0° 6° MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.