TLC542C, TLC542I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS075C – FEBRUARY 1989 – REVISED JUNE 2001
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D 8-Bit Resolution A/D Converter
D Microprocessor Peripheral or Stand-Alone
Operation
D On-Chip 12-Channel Analog Multiplexer
D Built-In Self-Test Mode
D Software-Controllable Sample and Hold
D Total Unadjusted Error ... ±0.5 LSB Max
D Direct Replacement for Motorola
MC145041
D Onboard System Clock
D End-of-Conversion (EOC) Output
D Pinout and Control Signals Compatible
With the TLC1542/3 10-Bit A/D Converters
D CMOS Technology
PARAMETER
VALUE
Channel Acquisition/Sample Time
16
s
Conversion Time (Max)
20
s
Samples per Second (Max)
25
× 103
Power Dissipation (Max)
10 mW
description
The TLC542 is a CMOS converter built around an
8-bit switched-capacitor successive-approximation
analog-to-digital converter. The device is designed
for serial interface to a microprocessor or peripheral
via a 3-state output with three inputs [including I/O
CLOCK, CS (chip select), and ADDRESS INPUT].
The TLC542 allows high-speed data transfers and
sample rates of up to 40,000 samples per second. In addition to the high-speed converter and versatile control
logic, an on-chip 12-channel analog multiplexer can sample any one of 11 inputs or an internal self-test voltage,
and the sample and hold is started under microprocessor control. At the end of conversion, the end-of-
conversion (EOC) output pin goes high to indicate that conversion is complete.
The converter incorporated in the TLC542 features differential high-impedance reference inputs that facilitate
ratiometric conversion, scaling, and isolation of analog circuitry from logic and supply noises. A switched-
capacitor design allows low-error (
±0.5 LSB) conversion in 20 s over the full operating temperature range.
The TLC542C is characterized for operation from 0
°C to 70°C and the TLC542I is characterized for operation
from – 40
°C to 85°C.
AVAILABLE OPTIONS
PACKAGE
TA
CHIP CARRIER
(FN)
PLASTIC DIP
(N)
SMALL OUTLINE
(DW)
0
°C to 70°C
—
TLC542CN
TLC542CDW
–40
°C to 85°C
TLC542IFN
TLC542IN
TLC542IDW
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
2001, 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.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
INPUT A0
INPUT A1
INPUT A2
INPUT A3
INPUT A4
INPUT A5
INPUT A6
INPUT A7
INPUT A8
GND
VCC
EOC
I/O CLOCK
ADDRESS INPUT
DATA OUT
CS
REF+
REF–
INPUT A10
INPUT A9
DW OR N PACKAGE
(TOP VIEW)
32
1 20 19
910 11 12 13
4
5
6
7
8
18
17
16
15
14
I/O CLOCK
ADDRESS INPU
DATA OUT
CS
REF+
INPUT A3
INPUT A4
INPUT A5
INPUT A6
INPUT A7
FN PACKAGE
(TOP VIEW)
INPUT
A2
INPUT
A1
INPUT
A0
INPUT
A10
REF–
V
EOC
INPUT
A8
GND
INPUT
A9
CC