General Description

The MAX1146–MAX1149 low-power, 14-bit, multichan-

nel, analog-to-digital converters (ADCs) feature an

internal track/hold (T/H), voltage reference, and clock.

The MAX1146/MAX1148 operate from a single +4.75V

to +5.25V supply, and the MAX1147/MAX1149 operate

from a single +2.7V to +3.6V supply. All analog inputs

are software configurable for unipolar/bipolar and sin-

gle-ended/differential operation.

The 4-wire serial interface connects directly to

SPI™/QSPI™/MICROWIRE™ devices without external

logic. The serial strobe output (SSTRB) allows conve-

nient connection to digital signal processors. The

MAX1146–MAX1149 use an internal clock or an exter-

nal serial-interface clock to perform successive-approx-

imation analog-to-digital conversions.

The MAX1146/MAX1148 include an internal +4.096V

reference, while the MAX1147/MAX1149 include an

internal +2.500V reference. All devices accept an exter-

The MAX1146–MAX1149 provide a hardware shutdown

and two software power-down modes. Using the soft-

ware power-down modes allows the devices to be pow-

ered down between conversions. When powered down,

accessing the serial interface automatically powers up

the devices. The quick turn-on time allows power-down

between all conversions. This technique reduces sup-

ply current to under 120µA for quick turn-on.

The MAX1146–MAX1149 are available in a 20-pin

TSSOP package.

Applications

Portable Data Logging

Data Acquisition

Medical Instruments

Battery-Powered Instruments

Process Control

Features

♦ 8-Channel Single-Ended or 4-Channel Differential

Inputs (MAX1148/MAX1149)

♦ 4-Channel Single-Ended or 2-Channel Differential

Inputs (MAX1146/MAX1147)

♦ Internal Multiplexer and T/H

♦ Single-Supply Operation

4.75V to 5.25V Supply (MAX1146/MAX1148)

2.7V to 3.6V Supply (MAX1147/MAX1149)

♦ Internal Reference

+4.096V (MAX1146/MAX1148)

+2.500V (MAX1147/MAX1149)

♦ 116ksps Sampling Rate

♦ Low Power

1.1mA (116ksps)

120µA (10ksps)

12µA (1ksps)

300nA (Power-Down Mode)

♦ SPI-/QSPI-/MICROWIRE Compatible

♦ 20-Pin TSSOP

Multichannel, True-Differential,

Serial, 14-Bit ADCs

________________________________________________________________ Maxim Integrated Products

1

Ordering Information/Selector Guide

19-3488; Rev 1; 1/05

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.

EVALUATION

KIT

AVAILABLE

PART

TEMP

RANGE

PIN-

PACKAGE

INL

(LSB)

INPUT

CHANNELS

INTERNAL

REFERENCE (V)

MAX1146BCUP

0

°C to +70°C

20 TSSOP

±2

4

+4.096

MAX1146BEUP

-40

°C to +85°C

20 TSSOP

±2

4

+4.096

MAX1147BCUP

0

°C to +70°C

20 TSSOP

±2

4

+2.500

MAX1147BEUP

-40

°C to +85°C

20 TSSOP

±2

4

+2.500

MAX1148BCUP

0

°C to +70°C

20 TSSOP

±2

8

+4.096

MAX1148BEUP

-40

°C to +85°C

20 TSSOP

±2

8

+4.096

MAX1149BCUP

0

°C to +70°C

20 TSSOP

±2

8

+2.500

MAX1149BEUP

-40

°C to +85°C

20 TSSOP

±2

8

+2.500

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations appear at end of data sheet.