AD7938-6 Analog Devices, AD7938-6 Datasheet - Page 9

• Manufacturer Part Number: AD7938-6
• Description: 8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer
• Manufacturer: Analog Devices

Specifications of AD7938-6

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 625kSPS
• Interface: Par
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
Figure 3. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
= 25°C, unless otherwise noted.
–100
–120
–195
–110
–60
–70
–80
–90
–70
–75
–80
–85
–90
80
70
60
50
40
30
20
10
0
0
Figure 4. AD7938-6 Channel-to-Channel Isolation
100mV p-p SINE WAVE ON V
NO DECOUPLING
DIFFERENTIAL/SINGLE-ENDED MODE
INTERNAL/EXTERNAL REFERENCE
V
F
RANGE = 0 TO V
DIFFERENTIAL MODE
SAMPLE
DD
Figure 5. AD7938-6 SINAD vs. Analog Input
100
= 5V
100
Frequency for Various Supply Voltages
EXT REF
INT REF
= 625kSPS
200
210
SUPPLY RIPPLE FREQUENCY (kHz)
200
300
REF
NOISE FREQUENCY (kHz)
300
FREQUENCY (kHz)
410
400
400
500
DD
V
AND/OR V
DD
610
600
= 3V
500
V
DD
700
DRIVE
= 5V
600
800
810
700
900
1010
1000
800
Rev. C | Page 9 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. AD7938-6 Typical DNL @ V
Figure 8. AD7938-6 Typical INL @ V
500
500
Figure 6. AD7938-6 FFT @ V
1000
1000
1500
1500
FREQUENCY (kHz)
2000
2000
CODE
CODE
2500
2500
DD
4096 POINT FFT
V
F
F
SINAD = 70.94dB
THD = –90.09dB
DIFFERENTIAL MODE
V
DIFFERENTIAL MODE
V
DIFFERENTIAL MODE
DD
DD
DD
SAMPLE
IN
= 5 V
= 49.62kHz
DD
DD
= 5V
= 5V
= 5V
3000
3000
= 5 V
= 5 V
= 625kSPS
AD7938-6
3500
3500
4000
4000