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PDF AD7903 Data sheet ( Hoja de datos )
| Número de pieza | AD7903 | |
| Descripción | PulSAR ADC | |
| Fabricantes | Analog Devices | |
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Data Sheet
Dual Differential 16-Bit, 1 MSPS
PulSAR ADC 12.0 mW in QSOP
AD7903
FEATURES
GENERAL DESCRIPTION
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
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
100
Bits kSPS
250
kSPS
400 kSPS
1000
to 500 kSPS kSPS
18
AD76911 AD76901
AD79821
16 AD7680 AD76851 AD76861
AD7683 AD76871 AD76881
AD7684 AD7694 AD76931
14 AD7940 AD79421 AD79461
AD79801
AD7903
AD7902
ADC
Driver
ADA4941-1
ADA4841-x
ADA4941-1
ADA4841-x
1 Pin-for-pin compatible.
FUNCTIONAL BLOCK DIAGRAM
REF = 2.5V TO 5V
2.5V
ADA4941-1
REF
±10V, ±5V, ...
REF
ADA4941-1
±10V, ±5V, ...
REF1 REF2 VDD1 VDD2
IN1+
ADC1
IN1–
VIO1
SDI1
SCK1
CNV1
SDO1
IN2+
ADC2
IN2–
VIO2
SDI2
SCK2
CNV2
SDO2
GND AD7903
VIO1/VIO2
SDI1/SDI2
SCK1/SCK2
CNV1/CNV2
SDO1
3-WIRE OR 4-WIRE
INTERFACE
(SPI, CS, AND
CHAIN MODES)
SDO2
Figure 1.
Rev. 0
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
rights of third parties that may result from its use. Specifications subject to change without 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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
Free Datasheet http://www.datasheet4u.com/
1 page  
AD7903
Data Sheet
VDD = 2.5 V, VIO = 2.3 V to 5.5 V, TA = −40°C to +125°C, unless otherwise noted.1
Table 3.
Parameter
REFERENCE
Voltage Range
Load Current
SAMPLING DYNAMICS
−3 dB Input Bandwidth
Aperture Delay
Aperture Delay Match
DIGITAL INPUTS
Logic Levels
VIL
VIH
IIL
IIH
DIGITAL OUTPUTS
Data Format
Pipeline Delay
VOL
VOH
POWER SUPPLIES
VDDx
VIOx
VIOx Range
IVDDx
IVIOx
Standby Current2, 3
Power Dissipation
VDD Only
REF Only
VIO Only
Energy per Conversion
TEMPERATURE RANGE4
Specified Performance
Test Conditions/Comments
1 MSPS, VREF = 5 V, each ADC
VDD = 2.5 V
VDD = 2.5 V
VIO > 3 V
VIO ≤ 3 V
VIO > 3 V
VIO ≤ 3 V
No delay; conversion results available
immediately after conversion is complete
ISINK = +500 µA
ISOURCE = −500 µA
Specified performance
Full Range
Each ADC
Each ADC
VDD and VIO = 2.5 V, 25°C
10 kSPS throughput
1 MSPS throughput
TMIN to TMAX
Min
2.4
−0.3
−0.3
0.7 × VIO
0.9 × VIO
−1
−1
VIO − 0.3
2.375
2.3
1.8
−40
Typ Max
5.1
330
10
2.0
2.0
+0.3 × VIO
+0.1 × VVIO
VIO + 0.3
VIO + 0.3
+1
+1
Twos complement
0
0.4
2.5 2.625
5.5
5.5
1.4 1.6
0.2 0.45
0.35
140
12.0 16
7.0
3.3
1.7
7.0
+125
1 In this data sheet, the voltages for the VDDx, VIOx, and REFx pins are indicated by VDD, VIO, and VREF, respectively.
2 With all digital inputs forced to VIOx or to ground as required.
3 During the acquisition phase.
4 Contact Analog Devices, Inc., for the extended temperature range.
Unit
V
µA
MHz
ns
ns
V
V
V
V
µA
µA
Bits
Samples
V
V
V
V
V
mA
mA
nA
µW
mW
mW
mW
mW
nJ/sample
°C
Rev. 0 | Page 4 of 28
Free Datasheet http://www.datasheet4u.com/
5 Page 
AD7903
96
95
94
93
92
91
90
89
88
87
86
85
10
94.8
100
INPUT FREQUENCY (MHz)
Figure 17. SINAD vs. Input Frequency
94.6
94.4
94.2
94.0
93.8
93.6
93.4
–55 –35 –15
5
25 45 65
85 105 125
TEMPERATURE (°C)
Figure 18. SNR vs. Temperature
1.4
IVDD
1.2
1.0
0.8
0.6
IREF
0.4
IVIO
0.2
0
2.375
2.425
2.475
2.525
VDD VOLTAGE (V)
2.575
2.625
Figure 19. Operating Currents of Each ADC vs. VDD Supply Voltage
Data Sheet
–80
–85
–90
–95
–100
–105
–110
–115
–120
10
–100
100
INPUT FREQUENCY (MHz)
Figure 20. THD vs. Input Frequency
–105
–110
–115
–120
–125
–55 –35 –15
5
25 45 65
85 105 125
TEMPERATURE (°C)
Figure 21. THD vs. Temperature
1.6
TA = 25°C
1.4
1.2
1.0
0.8
IVDD
0.6
0.4
0.2
IVIO
0
10 100 1000
SAMPLE RATE (kSPS)
Figure 22. Operating Currents of Each ADC vs. Sample RateCr
Rev. 0 | Page 10 of 28
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11 Page | ||
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| PDF Descargar | [ Datasheet AD7903.PDF ] | |
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