1

FEATURES

DESCRIPTION

APPLICATIONS

CDAC1

CDAC2

SARRegister1/2

S/H

S/H

Comparator

Comparator

CDAC3

CDAC4

SARRegister3/4

S/H

S/H

Comparator

Comparator

CDAC5

CDAC6

SARRegister5/6

StringDAC

Clock

Generator

S/H

S/H

Comparator

Comparator

Internal2.5V

Reference

I/O

Control

Logic

Config

Register

CH_A0

CONVST_A

CH_A1

AGND

AGND

REFC_A

CH_B0

CONVST_B

CH_B1

AGND

AGND

REFC_B

CH_C0

CONVST_C

CH_C1

AGND

AGND

REFC_C

REF IO

_

HVSS

AVDD

AGND

ADS8556

ADS8557

ADS8558

Buffer

Buffer

Buffer

Buffer

HVDD

BVDD

BGND

HW/SW

REF

/WR

EN

STBY

RESET

RANGE/XCLK

BUSY/INT

DB[15:0]

WORD/BYTE

PAR/SER

RD

CS

/FS

ADS8556

ADS8557

ADS8558

16-, 14-, 12-Bit, Six-Channel, Simultaneous Sampling

ANALOG-TO-DIGITAL CONVERTERS

2

• Family of 16-, 14-, 12-Bit, Pin- and

The ADS8556/7/8 contain six low-power, 16-, 14-, or

Software-Compatible ADCs

12-bit,

successive

approximation

register

(SAR)

based analog-to-digital converters (ADCs) with true

• Six SAR ADCs Grouped in Three Pairs

bipolar

inputs.

Each

channel

contains

a

• Maximum Data Rate Per Channel with Internal

sample-and-hold circuit that allows simultaneous

Conversion Clock and Reference:

high-speed multi-channel signal acquisition.

ADS8556: 630kSPS (PAR) or 450kSPS (SER)

The ADS8556/7/8 support data rates of up to

ADS8557: 670kSPS (PAR) or 470kSPS (SER)

730kSPS in parallel interface mode or up to 500kSPS

ADS8558: 730kSPS (PAR) or 500kSPS (SER)

if the serial interface is used. The bus width of the

• Maximum Data Rate with External Conversion

parallel interface can be set to eight or 16 bits. In

Clock and Reference:

serial mode, up to three output channels can be

800kSPS (PAR) or 530kSPS (SER)

activated.

• Pin-Selectable or Programmable Input Voltage

The ADS8556/7/8 is specified over the full industrial

Ranges: Up to ±12V

temperature range of –40°C to +125°C and is

• Excellent Signal-to-Noise Performance:

available in an LQFP-64 package.

91.5dB (ADS8556)

85dB (ADS8557)

73.9dB (ADS8558)

• Programmable and Buffered Internal

Reference: 0.5V to 2.5V and 0.5V to 3.0V

• Comprehensive Power-Down Modes:

Deep Power-Down (Standby Mode)

Partial Power-Down

Auto-Nap Power-Down

• Selectable Parallel or Serial Interface

• Operating Temperature Range:

–40°C to +125°C

• LQFP-64 Package

• Power Quality Measurement

• Protection Relays

• Multi-Axis Motor Control

• Programmable Logic Controllers

• Industrial Data Acquisition

1

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.