Datasheet > ADA4841-X

ADA4841-X

更新时间： 2024-11-28 04:31:15

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	2028K
描述
16-Bit, 8-Channel, 250 kSPS PulSAR㈢ ADC.

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ADA4841-X 数据手册

16-Bit, 8-Channel,

250 kSPS PulSAR^®ADC

Preliminary Technical Data

AD7689

FEATURES

FUNCTIONAL BLOCK DIAGRAM

2.7V to 5V

0.5V to 4.096V

0.5V to VDD

16-bit resolution with no missing codes

8-channel multiplexer with:

Unipolar single ended or

22μF

0.1μF

REFIN

REF

VDD

Differential (GND sense)/Bipolar inputs

Throughput: 250 kSPS

INL/DNL: 0.6 LSB typical

1.8V to

VDD

Band Gap

REF

VIO

AD7689

Temp

Sensor

Dynamic range: 93.5 dB

CNV

IN0

IN1

IN2

IN3

IN4

IN5

IN6

IN7

SINAD: 92.5 dB @ 20 kHz

THD: −100 dB @ 20 kHz

Analog input range:

0 V to V_REFwith V_REFup to VDD

Reference:

SCK

SDO

DIN

16-Bit SAR

ADC

SPI Serial

Interface

MUX

1-Pole

LPF

Sequencer

Internal selectable 2.5 V/4.096 V or

External buffered (up to 4.096 V)

External (up to VDD)

COM

GND

Figure 1.

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

1.8 V to 5 V logic interface

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

Power dissipation:

6 mW @ 5 V/100 kSPS

Table 1. Multichannel14-/16-Bit PulSAR ADC

500

kSPS

250

ADC

Driver

Type

Channels kSPS

14-Bit

16-Bit

AD7949

AD7682

AD7689

ADA4841-x

AD7699

Standby current: 1 nA

20-lead 4 mm × 4 mm LFCSP package

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.

APPLICATIONS

Battery-powered equipment

Medical instruments

Mobile communications

Personal digital assitants

Data acquisition

Seismic data acquisition systems

Instrumentation

Process Control

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.

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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