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
TA = –40°C to +85°C.