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AD7903 数据表(PDF) 1 Page - Analog Devices

部件名 AD7903
功能描述  Dual Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7903 数据表(HTML) 1 Page - Analog Devices

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Dual Differential 16-Bit, 1 MSPS
PulSAR ADC 12.0 mW in QSOP
Data Sheet
AD7903
FEATURES
16-bit resolution with no missing codes
Throughput: 1 MSPS
Low power dissipation
7.0 mW at 1 MSPS (VDD1 and VDD2 only)
12.0 mW at 1 MSPS (total)
140 µW at 10 kSPS
INL: ±0.5 LSB typical, ±2.0 LSB maximum
SINAD: 93.5 dB at 1 kHz
THD: −112 dB at 1 kHz
True differential analog input range: ±VREF
0 V to VREF with VREF between 2.4 V to 5.1 V
Allows use of any input range
Easy to drive with the ADA4941-1
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Serial port interface (SPI)/QSPI/MICROWIRE/DSP compatible
20-lead QSOP package
Wide operating temperature range: −40°C to +125°C
APPLICATIONS
Battery-powered equipment
Communications
Automated test equipment (ATE)
Data acquisition
Medical instrumentation
Redundant measurement
Simultaneous sampling
GENERAL DESCRIPTION
The AD7903 is a dual 16-bit, successive approximation, analog-
to-digital converter (ADC) that operates from a single power
supply, VDDx, per ADC. It contains two low power, high speed,
16-bit sampling ADCs and a versatile serial port interface (SPI).
On the CNVx rising edge, the AD7903 samples the voltage
difference between the INx+ and INx− pins. The voltages on
these pins usually swing in opposite phases between 0 V and
VREF. The externally applied reference voltage of the REFx pins
(VREF) can be set independently from the supply voltage pins,
VDDx. The power of the device scales linearly with throughput.
Using the SDIx inputs, the SPI-compatible serial interface can
also daisy-chain multiple ADCs on a single 3-wire bus and provide
an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V,
or 5 V logic, using the separate VIOx supplies.
The AD7903 is available in a 20-lead QSOP package with operation
specified from −40°C to +125°C.
Table 1. MSOP 14-/16-/18-Bit PulSAR® ADCs
Bits
100
kSPS
250
kSPS
400 kSPS
to 500 kSPS
1000
kSPS
ADC
Driver
18
AD76911
AD76901
AD79821
ADA4941-1
ADA4841-x
16
AD7680
AD76851
AD76861
AD79801
ADA4941-1
AD7683
AD76871
AD76881
AD7903
ADA4841-x
AD7684
AD7694
AD76931
AD7902
14
AD7940
AD79421
AD79461
1
Pin-for-pin compatible.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
GND
VDD1 VDD2
2.5V
REF1 REF2
REF = 2.5V TO 5V
ADC1
IN1+
IN1–
VIO1
SDI1
SCK1
CNV1
SDO1
VIO1/VIO2
SDI1/SDI2
SCK1/SCK2
CNV1/CNV2
SDO1
REF
±10V, ±5V, ...
ADC2
IN2+
IN2–
VIO2
SDI2
SCK2
CNV2
SDO2
SDO2
REF
±10V, ±5V, ...
3-WIRE OR 4-WIRE
INTERFACE
(SPI, CS, AND
CHAIN MODES)
AD7903
ADA4941-1
ADA4941-1
Rev. B
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
©2013–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


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