TLV2556
SLAS355A – DECEMBER 2001 – REVISED SEPTEMBER 2002
12-BIT, 200-KSPS, 11 CHANNEL, LOW POWER, SERIAL ADC
WITH INTERNAL REFERENCE
In addition to the high-speed converter and versatile
FEATURES
control capability, the device has an on-chip 14-channel
multiplexer that can select any one of 11 inputs or any
one of three internal self-test voltages using
configuration register 1. The sample-and-hold function
is automatic. At the end of conversion, when
programmed as EOC, the pin 19 output goes high to
indicate that conversion is complete. If pin 19 is
programmed as INT, the signal goes low when the
conversion is complete. The converter incorporated in
the device features differential, high-impedance
reference inputs that facilitate ratiometric conversion,
scaling, and isolation of analog circuitry from logic and
supply noise. A switched-capacitor design allows low-
error conversion over the full operating temperature
range. An internal reference is available and its voltage
level is programmable via configuration register 2
(CFGR2).
D
12-Bit-Resolution A/D Converter
D
Up to 200-KSPS (150-KSPS for 3 V)
Throughput Bit With 12-Output Mode Over
Operating Temperature Range
D
D
D
D
D
D
D
D
D
D
D
D
11 Analog Input Channels
3 Built-In Self-Test Modes
Programmable Reference (2.048/4.096 V
Internal, External)
Inherent Sample and Hold Function
Linearity Error . . . ±1 LSB Max
On-Chip Conversion Clock
Programmable Conversion Status Output: INT
or EOC
Unipolar or Bipolar Output Operation
Programmable MSB or LSB First
Programmable Power Down
The TLV2556I is characterized for operation from
T = –40°C to 85°C. See available options table for
A
package options.
Programmable Output Data Length
SPI Compatible Serial Interface With I/O Clock
Frequencies up to 15 MHz (CPOL=0, CPHA=0)
PW AND DW PACKAGE
(TOP VIEW)
APPLICATIONS
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
GND
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
D
D
D
D
Industrial Process Control
Portable Data Logging
Battery Powered Instruments
Automotive
INT/EOC
I/O CLOCK
DATA IN
DATA OUT
CS
14 REF+
DESCRIPTION
13
12
11
REF–
AIN10
AIN9
The TLV2556 is
a
12-bit, switched-capacitor,
successive-approximation, analog-to-digital converter.
The ADC has three control inputs [chip select (CS), the
input-output clock, and the address/control input
(DATAIN)], designed for communication with the serial
port of a host processor or peripheral through a serial
3-state output.
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.
Copyright 2002, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
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