LTC1297DI datasheet(8/24 Pages) LINER

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LTC1292/LTC1297

TEST CIRCUITS

Voltage Waveforms for ten

The LTC1292/LTC1297 are data acquisition components

which contain the following functional blocks:

1. 12-Bit Succesive Approximation Capacitive A/D

Converter

2. Differential Input

3. Sample-and-Hold (S/H)

4. Synchronous, Half-Duplex Serial Interface

5. Control and Timing Logic

DIGITAL CONSIDERATIONS

Serial Interface

The LTC1292/LTC1297 communicate with microproces-

sors and other external circuitry via a synchronous, half-

duplex, three-wire serial interface (see Operating Se-

quence). The clock (CLK) synchronizes the data transfer

with each bit being transmitted on the falling CLK edge.

The LTC1292/LTC1297 do not require a configuration

input word and have no DIN pin. They are permanently

configured to have a single differential input and to per-

form a unipolar conversion. A falling CS initiates data

transfer. To allow the LTC1297 to recover from the power

shutdown mode, tsuCS has to be met. Then the first CLK

pulse enables DOUT. After one null bit, the A/D conversion

result is output on the DOUT line with a MSB-first sequence

followed by a LSB-first sequence. With the half-duplex

serial interface the DOUT data is from the current conver-

sion. This provides easy interface to MSB-first or LSB-first

APPLICATI

I FOR ATIO

serial ports. Bringing CS high resets the LTC1292/LTC1297

for the next data exchange and puts the LTC1297 into its

power shutdown mode.

Table 1. Microprocessor with Hardware Serial Interfaces

Compatible with the LTC1292/LTC1297**

DOUT

0.8V

ten

B11

CLK

LTC1292/7 TC07

PART NUMBER

TYPE OF INTERFACE

Motorola

MC6805S2, S3

SPI

MC68HC11

SPI

MC68HC05

SPI

RCA

CDP68HC05

SPI

Hitachi

HD6305

SCI Synchronous

HD6301

SCI Synchronous

HD63701

SCI Synchronous

HD6303

SCI Synchronous

HD64180

SCI Synchronous

National Semiconductor

COP400 Family

MICROWIRE†

COP800 Family

MCROWIRE/PLUS†

NS8050U

MICROWIRE/PLUS

HPC16000 Family

MICROWIRE/PLUS

Texas Instruments

TMS7002

Serial Port

TMS7042

Serial Port

TMS70C02

Serial Port

TMS70C42

Serial Port

TMS32011*

Serial Port

TMS32020*

Serial Port

TMS370C050

SPI

* Requires external hardware

** Contact factory for interface information for processors not on this list

† MICROWIRE and MICROWIRE/PLUS are trademarks of National

Semiconductor Corp.

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