SARADC

String

DAC

2.5V/3V

REF

BUSY/INT

RANGE/XCLK

HW/SW

REF

/WR

RESET

EN

STBY

CS

RD

/

DB[15:0]

WORD/BYTE

PAR/SER

FS

CH_A0

CONVST_A

AGND

REFC_A

REF_IO

AVDD

BVDD

BGND

AGND

HVDD

HVSS

Control

Logic

Config

Register

I/O

SARADC

CH_A1

AGND

SARADC

CH_B0

CONVST_B

AGND

REFC_B

SARADC

CH_B1

AGND

SARADC

CH_C0

CONVST_C

AGND

REFC_C

SARADC

CH_C1

AGND

Clock

Generator

94

92

90

88

86

84

82

80

78

76

74

72

70

-40

-25

-10

5

20

35

50

65

125

Temperature (°C)

80

95

110

ADS8556

ADS8558

ADS8557

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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.

ADS8556, ADS8557, ADS8558

SBAS404D – OCTOBER 2006 – REVISED FEBRUARY 2016

ADS855x

16-, 14-, 12-Bit, Six-Channel, Simultaneous Sampling Analog-to-Digital Converters

1

1 Features

1

•

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

Software-Compatible ADCs

•

Six SAR ADCs Grouped in Three Pairs

•

Maximum Data Rate Per Channel with Internal

Conversion Clock and Reference:

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

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

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

•

Maximum Data Rate with External Conversion

Clock and Reference:

800 kSPS (PAR) or 530 kSPS (SER)

•

Pin-Selectable or Programmable Input Voltage

Ranges: Up to ±12 V

•

Excellent Signal-to-Noise Performance:

ADS8556: 91.5 dB, ADS8667: 85 dB,

ADS8668: 73.9 dB

•

Programmable and Buffered Internal Reference:

0.5 V to 2.5 V and 0.5 V to 3.0 V

•

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

Block Diagram

2 Applications

•

Power Quality Measurement

•

Protection Relays

•

Multi-Axis Motor Control

•

Programmable Logic Controllers

•

Industrial Data Acquisition

3 Description

The ADS855x contains six low-power, 16-, 14-, or 12-

bit, successive approximation register (SAR) based

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

inputs. Each channel contains a sample-and-hold

circuit that allows simultaneous high-speed multi-

channel signal acquisition.

The ADS855x supports data rates of up to 730 kSPS

in parallel interface mode or up to 500 kSPS if the

serial interface is used. The bus width of the parallel

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

mode, up to three output channels can be activated.

The ADS855x is specified over the full industrial

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

in an LQFP-64 package.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

ADS8556

LQFP (64)

10.00 mm × 10.00 mm

ADS8557

ADS8558

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

SNR vs Temperature