TLC545C Datasheet, PDF (1/13 Pages) Texas Instruments – 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 19 INPUTS

D 8-Bit Resolution A/D Converter
D Microprocessor Peripheral or Stand-Alone
Operation
D On-Chip 20-Channel Analog Multiplexer
D Built-in Self-Test Mode
D Software-Controllable Sample and Hold
D Total Unadjusted Error . . . ± 0.5 LSB Max
D Timing and Control Signals Compatible
With 8-Bit TLC540 and 10-Bit TLC1540 A/D
Converter Families
D CMOS Technology
PARAMETER
Channel Acquisition Time
Conversion Time (Max)
Sampling Rate (Max)
Power Dissipation (Max)
TL545
1.5 µs
9 µs
76 x 103
15 mW
TL546
2.7 µs
17 µs
40 x 103
15 mW
TLC545C, TLC545I, TLC546C, TLC546I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 19 INPUTS
SLAS066B – DECEMBER 1985 – REVISED OCTOBER 1996
N PACKAGE
(TOP VIEW)
INPUT A0 ₁
INPUT A1 ₂
INPUT A2 ₃
INPUT A3 ₄
INPUT A4 ₅
INPUT A5 ₆
INPUT A6 ₇
INPUT A7 8
INPUT A8 9
INPUT A9 10
INPUT A10 11
INPUT A11 12
INPUT A12 13
GND 14
28 ^V_CC
27 ^{SYSTEM CLOCK}
26 ^{I/O CLOCK}
25 ^{ADDRESS INPUT}
24 ^{DATA OUT}
23 ^CS
22 ^{REF +}
21 REF –
20 INPUT A18
19 INPUT A17
18 INPUT A16
17 INPUT A15
16 INPUT A14
15 INPUT A13
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.
INPUT A4
INPUT A5
INPUT A6
INPUT A7
INPUT A8
INPUT A9
INPUT A10
FN PACKAGE
(TOP VIEW)
4 3 2 1 28 27 26
5
25
6
24
7
23
8
22
9
21
10
20
11
19
12 13 14 15 16 17 18
ADDRESS INPUT
DATA OUT
CS
REF +
REF –
INPUT A18
INPUT A17
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.
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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Copyright © 1996, Texas Instruments Incorporated
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