AD7934 Analog Devices, AD7934 Datasheet - Page 11

• Manufacturer Part Number: AD7934
• Description: 4-Channel, 1.5 MSPS, 12-Bit Parallel ADC with a Sequencer
• Manufacturer: Analog Devices

Specifications of AD7934

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 1.5MSPS
• Interface: Byte,Par
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref) p-p,5V p-p,Uni (Vref),Uni (Vref) x 2,Uni 2.5V,Uni 5.0V
• Adc Architecture: SAR
• Pkg Type: SOP

TYPICAL PERFORMANCE CHARACTERISTICS
T
Figure 5. AD7934 SINAD vs. Analog Input Frequency for Various Supply Voltages
A
= 25°C, unless otherwise noted.
Figure 3. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
–100
–110
–120
–60
–70
–80
–90
–70
–75
–80
–85
–90
–95
80
70
60
50
40
30
20
10
0
0
100mV p-p SINE WAVE ON V
NO DECOUPLING
DIFFERENTIAL/SINGLE-ENDED MODE
INTERNAL/EXTERNAL REFERENCE
V
F
RANGE = 0 TO V
DIFFERENTIAL MODE
DD
SAMPLE
100
= 5V
100
Figure 4. Channel-to-Channel Isolation
EXT REF
INT REF
210
= 1.5MSPS
200
SUPPLY RIPPLE FREQUENCY (kHz)
200
300
REF
NOISE FREQUENCY (kHz)
300
FREQUENCY (kHz)
410
400
500
400
DD
V
AND/OR V
DD
600
610
= 3V
500
V
DD
700
DRIVE
= 5V
600
800
810
700
900
1010
1000
800
Rev. B | Page 11 of 32
–100
–110
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–0.8
–1.0
–10
–20
–30
–40
–50
–60
–70
–80
–90
1.0
0.8
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
0
0
0
0
0
Figure 7. AD7934 Typical DNL @ V
500
500
Figure 8. AD7934 Typical INL @ V
Figure 6. AD7934 FFT @ V
1000
1000
1500
1500
FREQUENCY (kHz)
2000
2000
CODE
CODE
AD7933/AD7934
2500
2500
DD
V
DIFFERENTIAL MODE
V
DIFFERENTIAL MODE
4096 POINT FFT
V
F
F
SINAD = 70.94dB
THD = –90.09dB
DIFFERENTIAL MODE
SAMPLE
IN
= 5 V
DD
DD
DD
DD
DD
= 49.62kHz
= 5V
= 5V
= 5V
3000
3000
= 5 V
= 5 V
= 1.5MSPS
3500
3500
4000
4000