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AD7682BCPZ Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD7682BCPZ
Szczegółowy opis  16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADCs
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Strona internetowa  http://www.analog.com
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16-Bit, 4-Channel/8-Channel,
250 kSPS PulSAR ADCs
Data Sheet
AD7682/AD7689
Rev. H
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
FEATURES
16-bit resolution with no missing codes
4-channel (AD7682)/8-channel (AD7689) multiplexer with
choice of inputs
Unipolar single-ended
Differential (GND sense)
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
Internal selectable 2.5 V or 4.096 V
External buffered (up to 4.096 V)
External (up to VDD)
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
20-lead 4 mm × 4 mm LFCSP package
20-lead 2.4 mm × 2.4 mm WLCSP package
APPLICATIONS
Multichannel system monitoring
Battery-powered equipment
Medical instruments: ECG/EKG
Mobile communications: GPS
Power line monitoring
Data acquisition
Seismic data acquisition systems
Instrumentation
Process control
FUNCTIONAL BLOCK DIAGRAM
AD7682/AD7689
REF
GND
VDD
VIO
DIN
SCK
SDO
CNV
1.8V
TO
VDD
2.3V TO 5.5V
SEQUENCER
SPI SERIAL
INTERFACE
MUX
16-BIT SAR
ADC
BAND GAP
REF
TEMP
SENSOR
REFIN
IN0
IN1
IN4
IN5
IN6
IN7
IN3
IN2
COM
0.5V TO VDD
10µF
ONE-POLE
LPF
0.5V TO VDD – 0.5V
0.1µF
Figure 1.
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.
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.
The AD7682/AD7689 are housed in a tiny 20-lead LFCSP and
20-lead WLCSP with operation specified from −40°C to +85°C.
Table 1. Multichannel 14-/16-Bit PulSAR® ADCs
Type
Channels
250 kSPS
500 kSPS
ADC Driver
14-Bit
8
AD7949
ADA4805-1
/
ADA4807-1
16-Bit
4
AD7682
ADA4805-1
/
ADA4807-1
16-Bit
8
AD7689
AD7699
ADA4805-1
/
ADA4807-1


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