TLC545C, TLC545I, TLC546C, TLC546I

8-BIT ANALOG-TO-DIGITAL CONVERTERS

WITH SERIAL CONTROL AND 19 INPUTS

SLAS066B – DECEMBER 1985 – REVISED OCTOBER 1996

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POST OFFICE BOX 655303

Operation

With 8-Bit TLC540 and 10-Bit TLC1540 A/D

Converter Families

PARAMETER

TL545

TL546

Channel Acquisition Time

Conversion Time (Max)

Sampling Rate (Max)

Power Dissipation (Max)

1.5

µs

9

µs

76 x 103

15 mW

2.7

µs

17

µs

40 x 103

15 mW

description

The

TLC545

and

TLC546

are

CMOS

analog-to-digital converters built around an 8-bit

switched

capacitor

successive-approximation

analog-to-digital converter. They are designed for

serial interface to a microprocessor or peripheral

via a 3-state output with up to four control inputs

including independent SYSTEM CLOCK, I/O

CLOCK, chip select (CS), and ADDRESS INPUT.

A 4-MHz system clock for the TLC545 and a

2.1-MHz system clock for the TLC546 with a

design that includes simultaneous read/write

operation allowing high-speed data transfers and

sample rates of up to 76,923 samples per second

for the TLC545, and 40,000 samples per second

for the TLC546.

In addition to the high-speed converter and

versatile control logic, there is an on-chip

20-channel analog multiplexer that can be used to

sample any one of 19 inputs or an internal self-test

voltage, and a sample-and-hold that can operate

automatically or under microprocessor control.

The converters incorporated in the TLC545 and TLC546 feature differential high-impedance reference inputs

that facilitate ratiometric conversion, scaling, and analog circuitry isolation from logic and supply noises. A totally

switched capacitor design allows low-error (

±0.5 LSB) conversion in 9 µs for the TLC545, and 17 µs for the

TLC546, over the full operating temperature range.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Copyright

© 1996, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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INPUT A0

INPUT A1

INPUT A2

INPUT A3

INPUT A4

INPUT A5

INPUT A6

INPUT A7

INPUT A8

INPUT A9

INPUT A10

INPUT A11

INPUT A12

GND

SYSTEM CLOCK

I/O CLOCK

ADDRESS INPUT

DATA OUT

CS

REF +

REF –

INPUT A18

INPUT A17

INPUT A16

INPUT A15

INPUT A14

INPUT A13

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ADDRESS INPUT

DATA OUT

CS

REF +

REF –

INPUT A18

INPUT A17

INPUT A4

INPUT A5

INPUT A6

INPUT A7

INPUT A8

INPUT A9

INPUT A10

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