TLC540I, TLC541I

8-BIT ANALOG-TO-DIGITAL CONVERTERS

WITH SERIAL CONTROL AND 11 INPUTS

SLAS065A – OCTOBER 1983 – REVISED MARCH 1995

2

POST OFFICE BOX 655303

The converters incorporated in the TLC540 and TLC541 feature differential high-impedance reference inputs

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

switched-capacitor design allows low-error (

±0.5 LSB) conversion in 9 µs for the TLC540 and 17 µs for the

TLC541 over the full operating temperature range.

The TLC540I and TLC541I are characterized for operation from – 40

°C to 85°C.The TLC541M is characterized

for operation from – 55

°C to 125°C.

functional block diagram

1

2

3

4

5

6

7

8

9

11

12

SYSTEM

CLOCK

CS

I/O

CLOCK

ADDRESS

INPUT

8-Bit

Analog-to-Digital

Converter

(Switched-Capacitors)

8

4

2

4

4

8

REF–

REF+

DATA

OUT

8-to-1 Data

Selector

and Driver

Control Logic

and I/O

Counters

Output

Data

Register

Input

Multiplexer

Self-Test

Reference

Input

Address

Register

Sample

and

Hold

12-Channel

Analog

Multiplexer

Analog

Inputs

A0

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

14

13

16

17

18

15

19

typical equivalent inputs

INPUT CIRCUIT IMPEDANCE DURING SAMPLING MODE

INPUT CIRCUIT IMPEDANCE DURING HOLD MODE

1 k

Ω TYP

Ci = 60 pF TYP

(equivalent input

capacitance)

5 M

Ω TYP

INPUT

A0 – A10

INPUT

A0 – A10