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AD7709BRUZ-REEL 数据手册 - ADI（亚德诺）
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ADI（亚德诺）
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AD转换器
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TSSOP-24
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AD7709BRUZ-REEL数据手册
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a
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 © 2003 Analog Devices, Inc. All rights reserved.
REV. A
16-Bit - ADC with
Switchable Current Sources
FUNCTIONAL BLOCK DIAGRAM
V
DD
IEXC1
8I
IEXC2
8I
IOUT1
IOUT2
IEXC3
I
OSCILLATOR
AND
PLL
XTAL2REFIN1(–) REFIN2(–)REFIN1(+) REFIN2(+) XTAL1
DOUT
RESET
RDY
CS
SCLK
DIN
SERIAL
INTERFACE
AND
CONTROL
LOGIC
BUF
PGA
MUX
I/O PORT
V
DD
16-BIT - ADC
AIN1
AIN2
AIN3/P3
AIN4/P4
AINCOM
AD7709
V
DD
GND
PWRGND
P1/SW1 P2/SW2
I = 25A
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
V
BE
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.
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