AD7709 datasheet(1/32 Pages) AD

部件名	AD7709

功能描述	16-Bit-ADC with Switchable Current Sources

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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AD7709

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. 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 companies.

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

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

REV. A

16-Bit - ADC with

Switchable Current Sources

FUNCTIONAL BLOCK DIAGRAM

VDD

IEXC1

8I

IEXC2

8I

IOUT1

IOUT2

IEXC3

I

OSCILLATOR

AND

PLL

XTAL2

REFIN1(–) REFIN2(–)

REFIN1(+) REFIN2(+)

XTAL1

DOUT

RESET

RDY

CS

SCLK

DIN

SERIAL

INTERFACE

AND

CONTROL

LOGIC

BUF

PGA

MUX

I/O PORT

VDD

16-BIT

-

ADC

AIN1

AIN2

AIN3/P3

AIN4/P4

AINCOM

AD7709

VDD

GND

PWRGND

P1/SW1 P2/SW2

I = 25 A

FEATURES

16-Bit

-

ADC

Programmable Gain Front End

Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz

Update Rate

VREF Select™ Allows Absolute and Ratiometric

Measurement Capability

ISOURCE Select™

16-Bit No Missing Codes

13-Bit p-p Resolution @ 20 Hz, 20 mV Range

16-Bit p-p Resolution @ 20 Hz, 2.56 V Range

INTERFACE

3-Wire Serial

SPI®, QSPI™, MICROWIRE™, and DSP Compatible

Schmitt Trigger on SCLK

POWER

Specified for Single 3 V and 5 V Operation

Normal: 1.25 mA Typ @ 3 V

Power-Down: 7

A (32.768 kHz Crystal Running)

ON-CHIP FUNCTIONS

Rail-to-Rail Input Buffer and PGA

Selectable Reference Inputs

3 Switchable, Ratioed Current Sources for

VBE Measurements

4-Bit Digital I/O Port

Low-Side Power Switches

APPLICATIONS

Sensor Measurement

Temperature Measurement

Pressure Measurements

Weigh Scales

Portable Instrumentation

4–20 mA Loops

GENERAL DESCRIPTION

The AD7709 is a complete analog front end for low frequency

measurement applications. It contains a 16-bit - ADC, selectable

reference inputs, three switchable matched excitation current

sources, low-side power switches, and a digital I/O port. The

16-bit channel with PGA accepts fully differential, unipolar,

and bipolar input signal ranges from 1.024

REFIN/128 to

1.024

REFIN. It can be configured as two fully differential

input channels or four pseudo-differential input channels. Signals

can be converted directly from a transducer without the need for

signal conditioning.

The device operates from a 32.768 kHz crystal with an on-chip

PLL generating the required internal operating frequency. The

output data rate from the part is software programmable. The

p-p resolution from the part varies with the programmed gain

and output data rate.

The part operates from a single 3 V or 5 V supply. When

operating from 3 V supplies, the power dissipation for the part

is 3.75 mW. The AD7709 is housed in a 24-lead TSSOP package.

类似零件编号 - AD7709

制造商	部件名	数据表	功能描述
Analog Devices	AD7709	248Kb / 17P	16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port
	AD7709	437Kb / 33P	16-Bit ADC with Switchable Current Sources 23-Feb-2017
	AD7709ARU	428Kb / 32P	16-Bit - ADC with Switchable Current Sources REV. A
	AD7709ARU	437Kb / 33P	16-Bit ADC with Switchable Current Sources 23-Feb-2017
	AD7709BR	248Kb / 17P	16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port

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类似说明 - AD7709

制造商	部件名	数据表	功能描述
Analog Devices	AD7709	248Kb / 17P	16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port
Analog Devices	AD7783	217Kb / 12P	Read-Only, Pin Configured 24-Bit ADC with Excitation Current Sources 8/04-Data Sheet Changed from REV. A to REV. B.
Linear Technology	LTC2480	535Kb / 40P	16-Bit ADC with Easy Drive
	LTC2482	319Kb / 32P	16-Bit ?誇 ADC with Easy Drive Input Current Cancellation
	LTC2480	500Kb / 42P	16-Bit ?誇 ADC with Easy Drive Input Current Cancellation
Analog Devices	AD7709ARU	428Kb / 32P	16-Bit - ADC with Switchable Current Sources REV. A
Linear Technology	LTC2480	679Kb / 42P	16-Bit ADC with Easy Drive Input Current Cancellation
	LTC2482	322Kb / 32P	16-Bit ADC with Easy Drive Input Current Cancellation
	LTC2496	658Kb / 32P	16-Bit 8-/16-Channel ADC with Easy Drive Input Current Cancellation
Analog Devices	AD7709	437Kb / 33P	16-Bit ADC with Switchable Current Sources 23-Feb-2017