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AD7682_17

更新时间： 2024-10-29 01:13:47
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亚德诺 - ADI /
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35页 743K
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16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADCs

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AD7682_17 数据手册

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16-Bit, 4-Channel/8-Channel,  
250 kSPS PulSAR ADCs  
Data Sheet  
AD7682/AD7689  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
2.3V TO 5.5V  
0.5V TO VDD – 0.5V  
0.1µF  
0.5V TO VDD  
10µF  
16-bit resolution with no missing codes  
4-channel (AD7682)/8-channel (AD7689) multiplexer with  
choice of inputs  
REFIN  
REF  
VDD  
Unipolar single-ended  
Differential (GND sense)  
1.8V  
TO  
VDD  
BAND GAP  
REF  
VIO  
AD7682/AD7689  
Pseudobipolar  
Throughput: 250 kSPS  
INL: 0.4 LSB typical, 1.5 LSB maximum ( 23 ppm or FSR)  
Dynamic range: 93.8 dB  
SINAD: 92.5 dB at 20 kHz  
THD: −100 dB at 20 kHz  
Analog input range: 0 V to VREF with VREF up to VDD  
Multiple reference types  
TEMP  
SENSOR  
CNV  
IN0  
IN1  
IN2  
IN3  
IN4  
IN5  
IN6  
IN7  
SCK  
SDO  
DIN  
SPI SERIAL  
INTERFACE  
16-BIT SAR  
ADC  
MUX  
ONE-POLE  
LPF  
SEQUENCER  
COM  
GND  
Internal selectable 2.5 V or 4.096 V  
External buffered (up to 4.096 V)  
External (up to VDD)  
Figure 1.  
Internal temperature sensor (TEMP)  
Channel sequencer, selectable 1-pole filter, busy indicator  
No pipeline delay, SAR architecture  
Single-supply 2.3 V to 5.5 V operation with 1.8 V to 5.5 V  
logic interface  
Serial interface compatible with SPI, MICROWIRE, QSPI,  
and DSP  
Power dissipation  
3.5 mW at 2.5 V/200 kSPS  
12.5 mW at 5 V/250 kSPS  
Standby current: 50 nA  
Low cost grade available  
GENERAL DESCRIPTION  
The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge  
redistribution successive approximation register (SAR) analog-  
to-digital converters (ADCs) that operate from a single power  
supply, VDD.  
The AD7682/AD7689 contain all components for use in a  
multichannel, low power data acquisition system, including a  
true 16-bit SAR ADC with no missing codes; a 4-channel  
(AD7682) or 8-channel (AD7689) low crosstalk multiplexer  
that is useful for configuring the inputs as single-ended (with or  
without ground sense), differential, or bipolar; an internal low  
drift reference (selectable 2.5 V or 4.096 V) and buffer; a  
temperature sensor; a selectable one-pole filter; and a sequencer  
that is useful when channels are continuously scanned in order.  
20-lead 4 mm × 4 mm LFCSP package  
20-lead 2.4 mm × 2.4 mm WLCSP package  
APPLICATIONS  
The AD7682/AD7689 use 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.  
Multichannel system monitoring  
Battery-powered equipment  
Medical instruments: ECG/EKG  
Mobile communications: GPS  
Power line monitoring  
The AD7682/AD7689 are housed in a tiny 20-lead LFCSP and  
20-lead WLCSP with operation specified from −40°C to +85°C.  
Data acquisition  
Seismic data acquisition systems  
Instrumentation  
Process control  
Table 1. Multichannel 14-/16-Bit PulSAR® ADCs  
Type Channels  
250 kSPS 500 kSPS ADC Driver  
8
4
8
AD7949  
AD7682  
AD7689  
14-Bit  
16-Bit  
16-Bit  
ADA4805-1/  
ADA4807-1  
ADA4805-1/  
ADA4807-1  
AD7699  
ADA4805-1/  
ADA4807-1  
Rev. H  
Document Feedback  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 ©2008–2017 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
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