General Description

The MAX1277/MAX1279 are low-power, high-speed, seri-

al-output, 12-bit, analog-to-digital converters (ADCs) with

an internal reference that operates at up to 1.5Msps.

These devices feature true-differential inputs, offering bet-

ter noise immunity, distortion improvements, and a wider

dynamic range over single-ended inputs. A standard

SPI™/QSPI™/MICROWIRE™ interface provides the clock

necessary for conversion. These devices easily interface

with standard digital signal processor (DSP) synchronous

serial interfaces.

The MAX1277/MAX1279 operate from a single +2.7V to

+3.6V supply voltage. The MAX1277/MAX1279 include a

2.048V internal reference. The MAX1277 has a unipolar

analog input, while the MAX1279 has a bipolar analog

input. These devices feature a partial power-down mode

and a full power-down mode for use between conver-

sions, which lower the supply current to 2mA (typ) and

1µA (max), respectively. Also featured is a separate

low-power dissipation, excellent AC performance, and DC

accuracy (±1 LSB INL) make the MAX1277/MAX1279

ideal for industrial process control, motor control, and

base-station applications.

The MAX1277/MAX1279 come in a 12-pin TQFN pack-

age, and are available in the commercial (0°C to +70°C)

and extended (-40°C to +85°C) temperature ranges.

Applications

Data Acquisition

Communications

Bill Validation

Portable Instruments

Motor Control

Features

♦ 1.5Msps Sampling Rate

♦ Only 22mW (typ) Power Dissipation

♦ Only 1µA (max) Shutdown Current

♦ High-Speed, SPI-Compatible, 3-Wire Serial Interface

♦ 68.5dB S/(N + D) at 525kHz Input Frequency

♦ Internal True-Differential Track/Hold (T/H)

♦ Internal 2.048V Reference

♦ No Pipeline Delays

♦ Small 12-Pin TQFN Package

1.5Msps, Single-Supply, Low-Power, True-

Differential, 12-Bit ADCs with Internal Reference

________________________________________________________________ Maxim Integrated Products

1

12

AIN+

11

N.C.

10

SCLK

45

N.C.

6

GND

1

2

REF

3

9

8

7

RGND

CNVST

DOUT

MAX1277

MAX1279

AIN-

TQFN

TOP VIEW

PART

TEMP RANGE

PIN-

PACKAGE

INPUT

MAX1277ACTC-T

0

°C to +70°C 12 TQFN-12

Unipolar

MAX1277BCTC-T

0

°C to +70°C 12 TQFN-12

Unipolar

MAX1277AETC-T

-40

°C to +85°C 12 TQFN-12

Unipolar

MAX1277BETC-T

-40

°C to +85°C 12 TQFN-12

Unipolar

MAX1279ACTC-T

0

°C to +70°C 12 TQFN-12

Bipolar

MAX1279BCTC-T

0

°C to +70°C 12 TQFN-12

Bipolar

MAX1279AETC-T

-40

°C to +85°C 12 TQFN-12

Bipolar

MAX1279BETC-T

-40

°C to +85°C 12 TQFN-12

Bipolar

Pin Configuration

Ordering Information

MAX1277

MAX1279

DOUT

AIN+

4.7

µF

10

µF

10

µF

+2.7V TO +3.6V

0.01

µF

0.01

µF

0.01

µF

AIN-

REF

DIFFERENTIAL

INPUT

VOLTAGE

RGND

GND

CNVST

SCLK

µC/DSP

+

-

Typical Operating Circuit

19-3365; Rev 0; 8/04

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.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.