AD7951 Analog Devices, AD7951 Datasheet - Page 19

• Manufacturer Part Number: AD7951
• Manufacturer: Analog Devices

Specifications of AD7951

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 1MSPS
• Interface: Byte,Par,Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip 10V,Bip 5.0V,Uni 10V,Uni 5.0V
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

TYPICAL CONNECTION DIAGRAM
Figure 27 shows a typical connection diagram for the AD7951 using the internal reference, serial data and serial configuration interfaces.
Different circuitry from that shown in Figure 27 is optional and is discussed in the following sections.
–7V TO –15.75V
NOTES
1. SEE ANALOG INPUT SECTION. ANALOG INPUT(–) IS REFERENCED TO AGND ±0.1V.
2. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
3. THE CONFIGURATION SHOWN IS USING THE INTERNAL REFERENCE. SEE VOLTAGE REFERENCE INPUT SECTION.
4. A 22µF CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (FOR EXAMPLE, PANASONIC ECJ4YB1A226M).
5. OPTION, SEE POWER SUPPLY SECTION.
6. THE VCC AND VEE SUPPLIES SHOULD BE VCC = [VIN(MAX) +2V] AND VEE = [VIN(MIN) –2V] FOR BIPOLAR INPUT RANGES.
7. OPTIONAL LOW JITTER CNVST, SEE CONVERSION CONTROL SECTION.
+7V TO +15.75V
SEE VOLTAGE REFERENCE INPUT SECTION.
FOR UNIPOLAR INPUT RANGES, VEE CAN BE 0V. SEE POWER SUPPLY SECTION.
NOTE 6
SUPPLY
SUPPLY
SUPPLY (5V)
ANALOG
ANALOG
INPUT+
INPUT–
ANALOG
NOTE 4
10µF
10µF
NOTE 2
U1
C
C
NOTE 1
C
22µF
10µF
REF
100nF
100nF
Figure 27. Typical Connection Diagram Shown with Serial Interface and Serial Programmable Port
2.7nF
15Ω
100nF
100nF
VCC
VEE
IN–
REF
REFBUFIN
REFGND
IN+
AVDD
NOTE 3
NOTE 5
AGND
10Ω
10µF
DGND
PDREF
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100nF
NOTE 3
AD7951
PDBUF
SUPPLY (5V)
DIGITAL
DVDD
PD
OVDD
RD
100nF
CS
BIPOLAR
SER/PAR
IMPULSE
SDOUT
SCCLK
HW/SW
SDCLK
CNVST
OGND
OB/2C
WARP
BUSY
SCCS
RESET
SCIN
TEN
10µF
50Ω
OVDD
NOTE 7
DIGITAL
INTERFACE
SUPPLY
(2.5V, 3.3V, OR 5V)
D
CLOCK
SERIAL
PORT 1
SERIAL
PORT 2
MICROCONVERTER/
MICROPROCESSOR/
AD7951
DSP