ADA4841-X AD [Analog Devices], ADA4841-X Datasheet

ADA4841-X

Manufacturer Part Number

ADA4841-X

Description

Manufacturer

AD [Analog Devices]

Datasheet

1.ADA4841-X.pdf (20 pages)

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Preliminary Technical Data

FEATURES

16-bit resolution with no missing codes

8-channel multiplexer with:

Throughput: 250 kSPS

INL/DNL: ±0.6 LSB typical

Dynamic range: 93.5 dB

SINAD: 92.5 dB @ 20 kHz

THD: −100 dB @ 20 kHz

Analog input range:

Reference:

Internal temperature sensor

Channel sequencer, selectable 1-pole filter, BUSY indicator

No pipeline delay, SAR architecture

Single-supply 2.7V – 5.5 V operation with

Serial interface SPI®/QSPI™/MICROWIRE™/DSP compatible

Power dissipation:

Standby current: 1 nA

20-lead 4 mm × 4 mm LFCSP package

APPLICATIONS

Battery-powered equipment

Data acquisition

Seismic data acquisition systems

Instrumentation

Process Control

Rev. PrC

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

1.8 V to 5 V logic interface

6 mW @ 5 V/100 kSPS

Unipolar single ended or

Differential (GND sense)/Bipolar inputs

0 V to V

Internal selectable 2.5 V/4.096 V or

External buffered (up to 4.096 V)

External (up to VDD)

Medical instruments

Mobile communications

Personal digital assitants

REF

with V

REF

up to VDD

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

COM

Table 1. Multichannel14-/16-Bit PulSAR ADC

Type

14-Bit

16-Bit

GENERAL DESCRIPTION

The AD7689 is an 8-channel 16-bit, charge redistribution

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

converter (ADC) that operates from a single power supply, VDD.

The AD7689 contains all of the components for use in a multi-

channel, low power, data acquisition system including: a true 16-

bit SAR ADC with no missing codes; an 8-channel, low crosstalk

multiplexer useful for configuring the inputs as single ended (with

or without ground sense), differential or bipolar; an internal low

drift reference (selectable 2.5V or 4.096V) and buffer; a

temperature sensor; a selectable 1-pole filter; and a sequencer

useful when channels are continuously scanned in order.

The AD7689 uses a simple SPI interface for writing to the

configuration register and receiving conversion results. The SPI

interface uses a separate supply, VIO, which is set to the host logic

level.

Power dissipation scales with throughput.

The AD7689 is housed in a tiny 20-lead LFCSP with operation

specified from −40°C to +85°C.

IN0

IN1

IN2

IN3

IN4

IN5

IN6

IN7

Band Gap

Sensor

Temp

REF

0.5V to 4.096V

FUNCTIONAL BLOCK DIAGRAM

0.1μF

250 kSPS PulSAR

Channels

REFIN

MUX

16-Bit, 8-Channel,

1-Pole

LPF

Figure 1.

22μF

0.5V to VDD

250

kSPS

AD7949

AD7682

AD7689

REF

16-Bit SAR

Sequencer

ADC

500

AD7699

kSPS

AD7689

www.analog.com

SPI Serial

Interface

GND

VDD

2.7V to 5V

ADC

Driver

ADA4841-x

ADC

VIO

DIN

CNV

SCK

SDO

1.8V to

VDD

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