General Description

The MAX6126 is an ultra-low-noise, high-precision, low-

dropout voltage reference. This family of voltage refer-

ences feature curvature-correction circuitry and

high-stability, laser-trimmed, thin-film resistors that

result in 3ppm/°C (max) temperature coefficients and

an excellent ±0.02% (max) initial accuracy. The propri-

etary low-noise reference architecture produces a low

60nV/

√Hz (2.048V output) without the increased supply

current usually found in low-noise references. Improve

wideband noise to 35nV/

√Hz and AC power-supply

rejection by adding a 0.1µF capacitor at the noise

reduction pin. The MAX6126 series mode reference

operates from a wide 2.7V to 12.6V supply voltage

range and load-regulation specifications are guaran-

teed to be less than 0.025

Ω for sink and source cur-

rents up to 10mA. These devices are available over the

automotive temperature range of -40°C to +125°C.

The MAX6126 typically draws 380µA of supply current

and is available in 2.048V, 2.500V, 3.000V, 4.096V, and

5.000V output voltages. These devices also feature

dropout voltages as low as 200mV. Unlike conventional

shunt-mode (two-terminal) references that waste supply

current and require an external resistor, the MAX6126

offers supply current that is virtually independent of

supply voltage and does not require an external resis-

tor. The MAX6126 is stable with 0.1µF to 10µF of load

capacitance.

The MAX6126 is available in the tiny 8-pin µMAX, as

well as 8-pin SO packages.

Applications

High-Resolution A/D and D/A Converters

ATE Equipment

High-Accuracy Reference Standard

Precision Current Sources

Digital Voltmeters

High-Accuracy Industrial and Process Control

Features

Output)

o Ultra-Low 3ppm/°C (max) Temperature Coefficient

o ±0.02% (max) Initial Accuracy

Range

o Low 200mV (max) Dropout Voltage

o 380µA Quiescent Supply Current

o 10mA Sink/Source-Current Capability

o Low 20ppm/1000hr Long-Term Stability

o 0.025Ω (max) Load Regulation

o 20µV/V (max) Line Regulation

o Force and Sense Outputs for Remote Sensing

Ultra-High-Precision, Ultra-Low-Noise,

Series Voltage Reference

________________________________________________________________ Maxim Integrated Products

1

OUTS

I.C.*

GNDS

1

2

8

7

I.C.*

OUTF

IN

GND

NR

SO/

µMAX

TOP VIEW

3

4

6

5

MAX6126

*I.C. = INTERNALLY CONNECTED. DO NOT USE.

Pin Configuration

Ordering Information

19-2647; Rev 2; 6/03

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

OUTPUT

VOLTAGE

(V)

MAXIMUM INITIAL

ACCURACY (%)

MAXIMUM TEMPCO

(-40°C to +85°C)

(ppm/°C)

TOP

MARK

MAX6126AASA21

-40

°C to +125°C

8 SO

2.048

0.02

3

—

MAX6126BASA21

-40

°C to +125°C

8 SO

2.048

0.06

5

—

MAX6126AAUA21

-40

°C to +125°C

8 µMAX

2.048

0.06

3

6126A21

Ordering Information continued at end of data sheet.