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AD7687BCPZ-R2 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD7687BCPZ-R2
Szczegółowy opis  16-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP
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16-Bit, 1.5 LSB INL, 250 kSPS PulSAR
Differential ADC in MSOP
Data Sheet
AD7687
Rev. E
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
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithout notice. 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
©2005–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
16-bit resolution with no missing codes
Throughput: 250 kSPS
INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR)
Dynamic range: 96.5 dB
SNR: 95.5 dB at 20 kHz
THD: −118 dB at 20 kHz
True differential analog input range
±VREF
0 V to VREF with VREF up to VDD on both inputs
No pipeline delay
Single-supply 2.3 V to 5.5 V operation with
1.8 V/2.5 V/3 V/5 V logic interface
Proprietary serial interface: SPI/QSPI™/MICROWIRE/DSP
compatible
Daisy-chain multiple ADCs and BUSY indicator
Power dissipation
1.35 mW at 2.5 V/100 kSPS, 4 mW at 5 V/100 kSPS, and
1.4 μW at 2.5 V/100 SPS
Standby current: 1 nA
10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP
Pin-for-pin compatible with AD7685, AD7686, and AD7688
APPLICATIONS
Battery-powered equipment
Data acquisitions
Instrumentation
Medical instruments
Process controls
TYPICAL APPLICATION CIRCUIT
AD7687
REF
GND
VDD
IN+
IN–
VIO
SDI
SCK
SDO
CNV
1.8V TO VDD
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
0.5V TO 5V
2.5 TO 5V
VREF
0
VREF
0
Figure 1.
GENERAL DESCRIPTION
The AD76871 is a 16-bit, charge redistribution, successive
approximation, analog-to-digital converter (ADC) that operates
from a single power supply, VDD, between 2.3 V to 5.5 V. It
contains a low power, high speed, 16-bit sampling ADC with no
missing codes, an internal conversion clock, and a versatile
serial interface port. The device also contains a low noise, wide
bandwidth, short aperture delay track-and-hold circuit. On the
CNV rising edge, the AD7687 the samples the voltage difference
between IN+ and IN− pins, which can range from −VREF to +VREF.
The reference voltage, VREF, is applied externally and can be set
up to the supply voltage.
The power consumption of the device scales linearly with
throughput.
The SPI-compatible serial interface also features the ability to
daisy-chain several ADCs on a single 3-wire bus and provides
an optional BUSY indicator by means of the SDI pin. It is
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using the separate
supply VIO.
The AD7687 comes in a 10-lead MSOP or a 10-lead LFCSP
with operation specified from −40°C to +85°C.
Table 1. MSOP, LFCSP/SOT-23 16-Bit PulSAR
® ADC
Type
100 kSPS
250 kSPS
500 kSPS
True Differential
AD7684
AD7687
AD7688
Pseudo
AD7683
AD7685
AD7686
Differential/Unipolar
AD7694
Unipolar
AD7680
1 Protected by U.S. Patent 6,703,961.


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