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.