LTC1289 Linear Technology, LTC1289 Datasheet

LTC1289

Manufacturer Part Number

LTC1289

Description

3 Volt Single Chip 12-Bit Data Acquisition System

Manufacturer

Linear Technology

Datasheet

1.LTC1289.pdf (28 pages)

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KEY SPECIFICATIO S

FEATURE

TYPICAL

FOR OVERVOLTAGE PROTECTION ON

ONLY ONE CHANNEL LIMIT THE INPUT

CURRENT TO 15mA. FOR MORE THAN

ONE CHANNEL LIMIT THE INPUT

CURRENT TO 7mA PER CHANNEL AND

28mA FOR ALL CHANNELS.

CONVERSION RESULTS ARE NOT VALID

WHEN THE SELECTED OR ANY OTHER

CHANNEL IS OVERVOLTAGED (V

or V

Single Supply 3.3V or 3.3V Operation

Software Programmable Features

Built-In Sample and Hold

Direct 4-Wire Interface to Most MPU Serial Ports

and all MPU Parallel Ports

25kHz Maximum Throughput Rate

Minimum Guaranteed Supply Voltage ............... 2.7V

Resolution ...................................................... 12 Bits

Fast Conversion Time .............. 26 s Max Over Temp

Low Supply Currents ...................................... 1.0mA

–

1/4 LTC1079

> V

Unipolar/Bipolar Conversions

4 Differential/8 Single-Ended Inputs

Variable Data Word Length

Power Shutdown

–3V

+3V

PPLICATI

< V

1N4148

10 F

–

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

DGND

LTC1289

Single Cell 3V 12-Bit Data Acquisition System

AGND

ACLK

SCLK

REF

OUT

–

TO AND

FROM

MPU

22 F

The LTC1289 is a 3V data acquisition component which

contains a serial I/O successive approximation A/D con-

verter. The device specifications are guaranteed at a

supply voltage of 2.7V. It uses LTCMOS

pacitor technology to perform a 12-bit unipolar, or 11-bit

plus sign bipolar A/D conversion. The 8 channel input

multiplexer can be configured for either single-ended or

differential inputs (or combinations thereof). An on-chip

sample and hold is included for all single-ended input

channels. When the LTC1289 is idle it can be powered

down in applications where low power consumption is

desired.

The serial I/O is designed to be compatible with industry

standard full duplex serial interfaces. It allows either MSB-

or LSB- first data and automatically provides 2’s comple-

ment output coding in the bipolar mode. The output data

word can be programmed for a length of 8, 12 or 16 bits.

This allows easy interface to shift registers and a variety of

processors.

LTCMOS

22 F

TANTALUM

ESCRIPTIO

0.1 F

Data Acquisition System

is a trademark of Linear Technology Corporation

3 Volt Single Chip 12-Bit

1N4148

1N5817

10k

LT1004-1.2

10 F

BOOST

CAP

GND

CAP

–

LTC1044

OSC

OUT

LTC1289

switched ca-

LTC1289 TA01

LITHIUM

–3V

22 F

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