ADS8902BRGER datasheet(1/76 Pages) TI1

Part #	ADS8902BRGER

Description	20-Bit, High-Speed SAR ADCs With Integrated Reference Buffer, Integrated LDO, and multiSPI Digital Interface

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ADC

LDO

BUF

AVDD

ADS89xxB

OPA2625

ADC

LDO

BUF

AVDD

ADS89xxB

OPA2625

REF5050

VIN

VOUT

GND

AVDD

Product

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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.

ADS8900B, ADS8902B, ADS8904B

SBAS728 – NOVEMBER 2016

ADS890xB 20-Bit, High-Speed SAR ADCs With Integrated Reference Buffer,

Integrated LDO, and multiSPI™ Digital Interface

1

1 Features

1

•

Resolution: 20 Bits

•

High Sample Rate With No Latency Output:

–

ADS8900B: 1 MSPS

–

ADS8902B: 500 kSPS

–

ADS8904B: 250 kSPS

•

Integrated LDO Enables Low-Power, Single-

Supply Operation

•

Burst-Mode Operation With Precise First Sample

•

Excellent AC and DC Performance:

–

SNR: 104.5 dB, THD: –125 dB

–

DNL: ±0.5 ppm (Max), 20-Bit NMC

–

INL: ±1 ppm (Typ)

–

±2 ppm (Max), 0°C to 60°C

–

±2.75 ppm (Max), –40°C to +85°C

–

±3.75 ppm (Max), –40°C to +125°C

•

Wide Input Range:

–

Unipolar Differential Input Range: ±VREF

–

VREF Input Range: 2.5 V to 5 V

•

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 Data Acquisition

3 Description

The

ADS8900B,

ADS8902B,

and

ADS8904B

(ADS890xB)

belong

to

a

family

of

pin-to-pin

compatible, high-speed, high-precision successive-

approximation-register

(SAR)

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 ±1-ppm INL and 104.5-dB SNR

specifications under typical operating conditions.

The integrated LDO enables single-supply operation

with

low

power

consumption.

The

integrated

reference buffer supports burst-mode data acquisition

with 20-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 ADS890xB family is offered in a space-saving,

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

the extended temperature range of –40°C to +125°C.

Device Information

PART NUMBER

PACKAGE

BODY SIZE (NOM)

ADS890xB

VQFN (24)

4.00 mm × 4.00 mm

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

at the end of the datasheet.

Multiple-ADC Design

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