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General Description

The MAX5491 precision resistor-divider consists of two

accurately matched resistors with access to the ends

and center of the divider. This device offers excellent

resistance matching of 0.035% (A grade), 0.05% (B

grade), and 0.1% (C grade). The MAX5491 includes an

extremely low resistance-ratio temperature drift of

2ppm/°C over -40°C to +85°C, and has an end-to-end

resistance of 30kΩ. Resistance ratios from 1:1 to 30:1 are

available. Ten standard ratios are available (see Table

1), and custom ratios are also available upon request. To

enhance device and system robustness, the MAX5491

also features ±2kV Human Body Model electrostatic dis-

charge (ESD) protection to ensure against real-world

ESD events. The MAX5491 is ideal for precision gain-set-

ting applications where tight resistance matching and

low temperature drift are necessary.

The MAX5491 is available in a space-saving 3-pin

SOT23 package, and is guaranteed over the extended

-40°C to +85°C temperature range.

Applications

Industrial Process Control

Instrumentation

Precision Gain Setting

Medical Equipment

Automatic Test Equipment

Base Stations

Features

♦ Resistance Ratios from 1:1 to 30:1

♦ Custom Ratios Available Upon Request

♦ ±2kV Human Body Model ESD Protection

♦ Tight Initial Ratio Accuracy

0.035% (MAX5491A)

0.05% (MAX5491B)

0.1% (MAX5491C)

♦ Low 2ppm/°C Resistor-Ratio-Drift

♦ Up to 50V Operating Voltage Across Sum of R1

and R2

♦ Tiny 3-Pin SOT23 Package

MAX5491

Precision-Matched Resistor-Divider in SOT23

________________________________________________________________ Maxim Integrated Products 1

3 P3

MAX5491

SOT23

TOP VIEW

Pin Configuration

Ordering Information*

MAX5491

Block Diagram

19-3009; Rev 3; 12/04

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.

*See the How to Order section for more details.

PA R T

T EM P

R A N G E

PIN -

PA C K A G E

RA TIO

AC CUR ACY

(%)

MAX5491

_A_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3

0.035

MAX5491_B_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3

0.05

MAX5491_C_ _ _ _ _ -T -40°C to +85°C 3 SOT23-3

0.1

Summary of content (7 pages)

PAGE 1
9-3009; Rev 3; 12/04 Precision-Matched Resistor-Divider in SOT23 The MAX5491 precision resistor-divider consists of two accurately matched resistors with access to the ends and center of the divider. This device offers excellent resistance matching of 0.035% (A grade), 0.05% (B grade), and 0.1% (C grade). The MAX5491 includes an extremely low resistance-ratio temperature drift of 2ppm/°C over -40°C to +85°C, and has an end-to-end resistance of 30kΩ. Resistance ratios from 1:1 to 30:1 are available.
PAGE 2
MAX5491 Precision-Matched Resistor-Divider in SOT23 ABSOLUTE MAXIMUM RATINGS Voltage Between P1 and P2...................................................50V Continuous Current into Any Pin....................................±1.75mA Continuous Power Dissipation (TA = +70°C) 3-Pin SOT23 (derate 7.1mW/°C above +70°C).........571.4mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................
PAGE 3
Precision-Matched Resistor-Divider in SOT23 NORMALIZED RESISTOR-RATIO DRIFT vs. TEMPERATURE 300 400 200 200 RATIO DRIFT (ppm) RATIO DRIFT (ppm) VP1-P2 = 10V RATIO = 5:1 300 MAX5491 toc02 VP1-P2 = 10V RATIO = 1:1 MAX5491 toc01 400 NORMALIZED RESISTOR-RATIO DRIFT vs.
PAGE 4
Precision-Matched Resistor-Divider in SOT23 MAX5491 Typical Applications A = VOUT R = − 1 VIN R2 A = IN VOUT R = 1+ 1 VIN R2 OUT OUT P3 P3 MAX5491 P2 P1 R2 MAX5491 P2 IN R1 R2 Figure 1. Inverting Amplifier Configuration R1 Figure 2. Noninverting Amplifier Configuration IN A = P1 VOUT R2 = VIN R1 + R2 IN A = P1 VOUT R2 = VIN R1 + R2 MAX5491 P1 R1 MAX5491 P3 R1 P3 OUT R2 OUT R2 P2 P2 Figure 3. Buffered Attenuator Figure 4.
PAGE 5
Precision-Matched Resistor-Divider in SOT23 PREFIX MAX 5491 V A 10000 -T ROOT PART NUMBER MAX5491 = 30kΩ End-to-End RATIO RANGE L through W. Resistor ratio must fall in the appropriate ratio range. (See Table 2.) RATIO ACCURACY A = 0.035% (max); B = 0.05% (max); C = 0.1% (max) RESISTANCE RATIO Five number ratio designator. Ratios available from 1:1 to 30:1. Format examples: 010000 = 1:1 02500 = 2.5:1 07538 = 7.
PAGE 6
MAX5491 Precision-Matched Resistor-Divider in SOT23 Table 1. Standard Ratios* (continued) PART RESISTOR RATIO RESISTOR-RATIO SUFFIX RESISTOR-RATIO ACCURACY (% MAX) TOP MARK 2.5:1 02500 0.050 FZPQ MAX5491RB02500-T MAX5491RC02500-T 2.5:1 02500 0.100 FZON MAX5491SA03200-T 3.2:1 03200 0.035 FZOU MAX5491SB03200-T 3.2:1 03200 0.050 FZOV MAX5491SC03200-T 3.2:1 03200 0.100 FZOW MAX5491TA05000-T 5:1 05000 0.035 FZOR MAX5491TB05000-T 5:1 05000 0.
PAGE 7
Precision-Matched Resistor-Divider in SOT23 SOT23 L.EPS PACKAGE OUTLINE, 3L SOT-23 21-0051 F 1 1 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.