TLV2556_16 Datasheet, PDF (1/39 Pages) Texas Instruments – 11-Channel Low-Power Serial ADC

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TLV2556
SLAS355B – DECEMBER 2001 – REVISED DECEMBER 2015
TLV2556 12-Bit 200-kSPS 11-Channel Low-Power Serial ADC With Internal Reference
1 Features
•1 12-Bit Resolution Analog-to-Digital Converter
(ADC)
• Up to 200-kSPS (150-kSPS for 3 V) Throughput
Over Operating Temperature Range With 12-Bit
Output Mode
• 11 Analog Input Channels
• Three Built-In Self-Test Modes
• Inherent Sample and Hold Function
• Programmable Reference Source (2.048 / 4.096 V
Internal or External)
• Inherent Sample and Hold Function
• Linearity Error of ±1 LSB (Maximum)
• On-Chip Conversion Clock
• Programmable Conversion Status Output: INT or
EOC
• Unipolar or Bipolar Output Operation
• Programmable Most Significant Bit (MSB) or Least
Significant Bit (LSB) First
• Programmable Power Down
• Programmable Output Data Length
• SPI-Compatible Serial Interface With I/O Clock
Frequencies Up to 15 MHz (CPOL = 0,
CPHA = 0)
2 Applications
• Industrial Process Control
• Portable Data Logging
• Battery-Powered Instruments
• Automotive
3 Description
The TLV2556 device is a 12-bit switched-capacitor
successive-approximation analog-to-digital converter
(ADC). The ADC has three control inputs: chip select
(CS), the input-output clock, and the address and
control input (DATAIN). These inputs communicate
with the serial port of a host processor or peripheral
through a serial 3-state output.
In addition to the high-speed converter and versatile
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 through
configuration register 2 (CFGR2).
The TLV2556 is characterized for operation from
T_A = –40°C to +85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TLV2556
SOIC (20)
TSSOP (20)
7.50 mm × 12.80 mm
4.40 mm × 6.50 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
AIN0
AIN1
1
2
AIN2 ³
AIN3 ⁴
AIN4 ⁵
AIN5 ⁶
AIN6 ⁷
AIN7 ⁸
AIN8 ⁹
AIN9
AIN10
11
12
17
DATA IN
15
CS
18
I/O CLOCK
3 Self Test
Block Diagram
V_CC
20
REF+
REF±
14
13
4.096-V and 2.048-V
Internal Reference
Reference CTRL
14-Channel
Analog
Multiplexer
Sample and Hold
4
Input Address
Register
Control Logic and
I/O Counters
10
GND
Low-Power 12-Bit
SAR ADC
12
Output Data ¹²
Register
4
Internal
Oscillator
12-to-1 Data
Selector and
Driver
19 _INT/EOC
16 DATA
OUT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.