Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX5426CEUD+

General Description

The MAX5426 is a precision resistor network optimized

for use with programmable instrumentation amplifiers.

The MAX5426 operates from dual ±5V to ±15V supplies

and consumes less than 40µA of supply current.

Designed to be used in the traditional three op amp

instrumentation amplifier topology, this device provides

noninverting gains of 1, 2, 4, and 8 that are accurate to

0.025% (A-grade), 0.09% (B-grade), or 0.5%

(C-grade) over the extended temperature range (-40°C

to +85°C). The MAX5426 is available in the 6.4mm ✕

5mm 14-pin TSSOP package.

Applications

General-Purpose Programmable Instrumentation

Amplifiers

Gain Control in RF Power Amplifiers

Precision Dual Attenuator

Features

♦ Differential Gains: A

= 1, 2, 4, 8

♦ Gain Accurate to 0.025%, 0.09%, or 0.5%

♦ Dual Supply ±5V to ±15V Operation

♦ Low 36µA Supply Current

♦ Simple CMOS/TTL Logic Compatible 2-Wire

Parallel Interface

♦ Space-Saving 14-Pin TSSOP Package

(6.4mm

5mm)

♦ OFFSET Pin Available to Offset the Output of the

Differential Amplifier

MAX5426

Precision Resistor Network for

Programmable Instrumentation Amplifiers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2318; Rev 0; 1/02

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.

PART

TEMP

RANGE

PIN-

PACKAGE

GAIN

MAX5426AEUD -40°C to +85°C 14 TSSOP 0.025%

MAX5426BEUD -40°C to +85°C 14 TSSOP 0.09%

MAX5426CEUD -40°C to +85°C 14 TSSOP 0.5%

FB2

INDIF-

OUT2 INDIF+

OUT

OFFSET

IN-

IN+

GND

FB1 OUT1

OUT

MAX5426

Typical Operating Circuit

Pin Configuration and Functional Diagram appear at

end of data sheet.

Summary of content (9 pages)

PAGE 1
9-2318; Rev 0; 1/02 Precision Resistor Network for Programmable Instrumentation Amplifiers Features ♦ Differential Gains: AV = 1, 2, 4, 8 ♦ Gain Accurate to 0.025%, 0.09%, or 0.5% ♦ Dual Supply ±5V to ±15V Operation ♦ Low 36µA Supply Current ♦ Simple CMOS/TTL Logic Compatible 2-Wire Parallel Interface ♦ Space-Saving 14-Pin TSSOP Package (6.
PAGE 2
MAX5426 Precision Resistor Network for Programmable Instrumentation Amplifiers ABSOLUTE MAXIMUM RATINGS VDD to GND ............................................................-0.3V to +17V VSS to GND.............................................................-17V to +0.3V D0, D1 to GND ...........................................-0.3V to (VDD + 0.2V) D0, D1 to GND (VDD > +6V) .................................-0.3V to +6.0V All Other Pins to GND ......................(VSS - 0.3V) to (VDD + 0.
PAGE 3
Precision Resistor Network for Programmable Instrumentation Amplifiers (VDD = +15V, VSS = -15V, GND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
Typical Operating Characteristics (VDD = +15V, VSS = -15V, TA = +25°C, unless otherwise noted.) MAX5426A GAIN ACCURACY vs. TEMPERATURE MAX5426A GAIN ACCURACY vs. POSITIVE SUPPLY VOLTAGE GAIN 4 GAIN 1 0 -0.005 -0.010 GAIN 2 GAIN 4 -0.004 -0.006 -0.008 35 50 65 80 TEMPERATURE (°C) 8.75 10.75 GAIN 4 -0.015 GAIN 8 MAX5426 toc03 -13 -0.010 -0.015 -0.030 -0.030 -9 -7 -5 POSITIVE SUPPLY CURRENT vs. TEMPERATURE GAIN 4 GAIN 8 -0.020 -11 NEGATIVE SUPPLY VOLTAGE (V) GAIN 2 GAIN 1 -0.
PAGE 5
Precision Resistor Network for Programmable Instrumentation Amplifiers PIN NAME 1 VDD Positive Power Supply. Bypass VDD to GND with a 0.1µF capacitor. 2 GND Ground 3 VSS Negative Power Supply. Bypass VSS to GND with a 0.1µF capacitor. FB2 First Stage Positive Input Terminal Resistor. Connect to the inverting terminal of the second input buffer (see Figure 1). 5 OUT2 First Stage Positive Output Terminal Resistor. Connect to the output terminal of the second input buffer.
PAGE 6
MAX5426 Precision Resistor Network for Programmable Instrumentation Amplifiers MAX427 VIN- FB1 VDD OUT1 INDIF- D0 OUT D1 VOUT CM MAX5426 MAX427 OFFSET VSS GND FB2 OUT2 INDIF+ VIN+ MAX427 Figure 1. Programmable Instrumentation Amplifier Using MAX5426 Applications Information The MAX5426 is ideal for programmable instrumentation amplifier applications. The typical application circuit of Figure 1 uses the MAX5426 in classical instrumentation amplifier configurations.
PAGE 7
Precision Resistor Network for Programmable Instrumentation Amplifiers FB1 MAX5426 TO RIGHT CHANNEL AMPLIFIER RIGHT CHANNEL INDIF- OUT1 VDD OUT CM D1 D0 OFFSET VSS FB2 GND TO LEFT CHANNEL AMPLIFIER OUT2 INDIF+ LEFT CHANNEL Figure 2. Stereo Audio-Taper Attenuator OUT1 OUT1 tSETTLE tSWITCHING tSETTLE FB1 FB1 FB2 FB2 OUT2 OUT2 D1, D0 D1, D0 CASE 1: DIFFERENTIAL INPUT IS CHANGED, WHILE D1, D0 IS FIXED.
PAGE 8
Precision Resistor Network for Programmable Instrumentation Amplifiers MAX5426 Functional Diagram VDD FB1 OUT1 INDIF- D1 D0 OUT CM MAX5426 OFFSET GND VSS FB2 Pin Configuration OUT2 INDIF+ Chip Information TRANSISTOR COUNT: 126 PROCESS TECHNOLOGY: BICMOS TOP VIEW VDD 1 14 D1 GND 2 13 D0 VSS 3 12 CM FB2 4 OUT2 5 8 MAX5426 11 FB1 10 OUT1 OFFSET 6 9 OUT INDIF- 7 8 INDIF+ _______________________________________________________________________________________
PAGE 9
Precision Resistor Network for Programmable Instrumentation Amplifiers TSSOP,NO PADS.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.