SAR

ADC

LDO

BUF

GND

RVDD

DECAP

REFIN

REFBUFOUT

REFM

AINP

AINM

DVDD

multiSPI

TM

Digital

Interface

To Digital

Host

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

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. PRODUCT PREVIEW Information. Product in design phase of

development. Subject to change or discontinuance without notice.

ADS8920B

ADS8922B

ADS8924B

SBAS729 – JUNE 2016

ADS892xB 16-bit, High-Speed SAR ADCs With Integrated Reference Buffer,

Integrated LDO, and multiSPI™ Digital Interface

1

1 Features

1

•

Resolution: 16-bit

•

High Sample Rate With No Latency Output:

–

ADS8920B : 1 MSPS

–

ADS8922B : 500 kSPS

–

ADS8924B : 250 kSPS

•

Integrated LDO Enables Single-Supply Operation

•

Burst-Mode Operation With Precise First Sample

•

Excellent AC and DC Performance:

–

SNR: 96.8 dB, THD: –125 dB

–

INL: ±0.5 LSB (Max)

–

DNL: ±0.5 LSB (Max), 16-Bit NMC

•

Wide Input Range:

–

–

•

Single-Supply, Low-Power Operation

(Includes Internal Reference Buffer and LDO)

–

ADS8920B : 21 mW at 1 MSPS

–

ADS8922B : 16 mW at 500 kSPS

–

ADS8924B : 14 mW at 250 kSPS

•

multiSPI™ Digital Interface

•

Extended Temperature Range: –40°C to +125°C

•

Small Footprint: 4-mm × 4-mm VQFN

2 Applications

•

Test and Measurement

•

Medical Imaging

•

High-Precision, High-Speed Industrial Data

Acquisition

3 Description

The

ADS8920B,

ADS8922B,

and

ADS8924B

(ADS892xB)

belong

to

a

family

of

pin-to-pin

compatible, high-speed, high-precision successsive

approximation register (SAR) based, analog-to-digital

convertors (ADCs) with an integrated reference buffer

and integrated low-dropout regulator (LDO). These

devices support unipolar, fully-differential analog input

signals with ±0.5-LSB INL (max) and 96-dB SNR

(min) specifications over the specified range of

operating conditions.

The integrated LDO enables single-supply operation

with

low

power

consumption.

The

integrated

reference buffer supports burst-mode data acquisition

with 16-bit precision for the first sample. External

reference voltages in the range 2.5 V to 5 V are

supported, offering a wide selection of input ranges

without additional input scaling.

The integrated multiSPI digital interface is backward-

compatible

to

the

traditional

SPI

protocol.

Additionally, configurable features simplify board

layout, timing, and firmware, and support high

throughput at lower clock speeds. The multiSPI digital

interface allows for easy interface with a variety of

microcontrollers, digital signal processors (DSPs),

and field-programmable gate arrays (FPGAs).

The ADS892x family is offered in a space-saving,

4-mm × 4-mm, VQFN package, and is fully specified

over the extended temperature range of –40°C to

+125°C.

Device Information

PART NUMBER

PACKAGE

BODY SIZE (NOM)

ADS892xB

VQFN (24)

4.00 mm × 4.00 mm

(1) For all available packages, see the package option addendum

at the end of the datasheet.

Functional Block Diagram