MAX1280 Maxim, MAX1280 Datasheet

MAX1280

Manufacturer Part Number

MAX1280

Description

MAX1280 Evaluation System

Manufacturer

Maxim

Datasheet

1.MAX1280.pdf (24 pages)

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The MAX1280/MAX1281 12-bit ADCs combine an 8-chan-

nel analog-input multiplexer, high-bandwidth track/hold,

and serial interface with high conversion speed and low

power consumption. The MAX1280 operates from a single

+4.5V to +5.5V supply; the MAX1281 operates from a sin-

gle +2.7V to +3.6V supply. Both devices’ analog inputs

are software configurable for unipolar/bipolar and single-

ended/pseudo-differential operation.

The 4-wire serial interface connects directly to

SPI™/QSPI™/MICROWIRE™ devices without external

logic. A serial strobe output allows direct connection to

TMS320-family digital signal processors. The MAX1280/

MAX1281 use an external serial-interface clock to per-

form successive-approximation analog-to-digital con-

versions. Both parts feature an internal +2.5V reference

and a reference-buffer amplifier with a ±1.5% voltage-

adjustment range. An external reference with a 1V to

The MAX1280/MAX1281 provide a hard-wired SHDN

pin and four software-selectable power modes (normal

operation, reduced power, fast power-down, and full

power-down). These devices can be programmed to

automatically shut down at the end of a conversion or to

operate with reduced power. When using the power-

down modes, accessing the serial interface automatical-

ly powers up the devices, and the quick turn-on time

allows them to be powered down between all conver-

sions. This technique can cut supply current to under

100µA at reduced sampling rates.

The MAX1280/MAX1281 are available in 20-pin TSSOP

packages. These devices are higher-speed versions of

the MAX146/MAX147 (for more information, see the

respective data sheet).

19-1684; Rev 0; 5/00

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,

DD1

range may also be used.

Portable Data Logging

Data Acquisition

Medical Instruments

Battery-Powered Instruments

Pen Digitizers

Process Control

________________________________________________________________ Maxim Integrated Products

General Description

Serial 12-Bit ADCs with Internal Reference

Applications

o 8-Channel Single-Ended or 4-Channel

o Internal Multiplexer and Track/Hold

o Single-Supply Operation

o Internal +2.5V Reference

o 400ksps Sampling Rate (MAX1280)

o Low Power 2.5mA (400ksps)

o SPI/QSPI/MICROWIRE/TMS320-Compatible

o Software-Configurable Unipolar or Bipolar Inputs

o 20-Pin TSSOP Package

Ordering Information continued at end of data sheet.

MAX1280BCUP

MAX1280BEUP

Pseudo-Differential Inputs

4-Wire Serial Interface

+4.5V to +5.5V (MAX1280)

+2.7V to +3.6V (MAX1281)

1.3mA (Reduced-Power Mode)

0.9mA (Fast Power-Down Mode)

2µA (Full Power-Down)

PART

TOP VIEW

SHDN

COM

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

-40°C to +85°C

0°C to +70°C

RANGE

TEMP.

Ordering Information

MAX1280

MAX1281

TSSOP

Pin Configuration

20 TSSOP

PACKAGE

PIN-

DIN

SSTRB

DOUT

GND

REFADJ

REF

SCLK

DD1

DD2

Features

(LSB)

±1

INL

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