參數(shù)資料
型號(hào)： EVAL-AD7682EDZ
廠商： Analog Devices Inc
文件頁數(shù)： 1/32頁
文件大?。?/td> 0K
描述： BOARD EVAL AD7682
標(biāo)準(zhǔn)包裝： 1
系列： PulSAR®
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 250k
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 12.5mW @ 250kSPS，5V
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7682
已供物品： 板
16-Bit, 4-Channel/8-Channel,
250 kSPS PulSAR ADC
Data Sheet
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
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
www.analog.com
Fax: 781.461.3113
2008–2012 Analog Devices, Inc. All rights reserved.
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 @ 2.5 V/200 kSPS
12.5 mW @ 5 V/250 kSPS
Standby current: 50 nA
Low cost grade available
20-lead 4 mm × 4 mm LFCSP 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
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
10F
ONE-POLE
LPF
0.5V TO VDD – 0.5V
0.1F
07
35
3-
0
01
Figure 1.
Table 1. Multichannel 14-/16-Bit PulSAR ADC
Type
Channels
250 kSPS
500 kSPS
ADC Driver
14-Bit
16-Bit
4
16-Bit
8
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 with
operation specified from 40°C to +85°C.
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