Datasheet

TLC540I, TLC541I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS065B – OCTOBER 1983 – REVISED JUNE 2001
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description (continued)
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 kΩ TYP
C
i
= 60 pF TYP
(equivalent input
capacitance)
5 MΩ TYP
INPUT
A0–A10
INPUT
A0–A10