Datasheet

AD7933/AD7934
Rev. B | Page 11 of 32
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise noted.
SUPPLY RIPPLE FREQUENCY (kHz)
PSRR (dB)
60
–70
–80
–90
–110
–100
–120
10 210 610410 810 1010
100mV p-p SINE WAVE ON V
DD
AND/OR V
DRIVE
NO DECOUPLING
DIFFERENTIAL/SINGLE-ENDED MODE
INT REF
EXT REF
03713-007
Figure 3. PSRR vs. Supply Ripple Frequency Without Supply Decoupling
NOISE FREQUENCY (kHz)
NOISE ISOLATION (dB)
70
–75
–90
–85
–80
–95
0 100 400200 300 600500 800700
INTERNAL/EXTERNAL REFERENCE
V
DD
=5V
03713-021
Figure 4. Channel-to-Channel Isolation
FREQUENCY (kHz)
SINAD (dB)
80
20
30
40
50
60
70
0 100 400200 300 600500 1000700 800 900
F
SAMPLE
= 1.5MSPS
RANGE = 0 TO V
REF
DIFFERENTIAL MODE
V
DD
=5V
V
DD
=3V
03713-008
Figure 5. AD7934 SINAD vs. Analog Input Frequency for Various Supply Voltages
FREQUENCY (kHz)
0
–10
–20
–50
–40
–30
–90
–100
–80
–70
–60
–110
0
100
200
300
400
500
600
700
03713-009
4096 POINT FFT
V
DD
=5V
F
SAMPLE
=1.5MSPS
F
IN
= 49.62kHz
SINAD = 70.94dB
THD = 90.09dB
DIFFERENTIAL MODE
AMPLITUDE (dB)
Figure 6. AD7934 FFT @ V
DD
= 5 V
CODE
DNL ERROR (LSB)
1.0
0.8
0.6
0.4
0.2
–0.2
0
–0.8
–0.6
–0.4
–1.0
0 500 20001000 1500 30002500 40003500
V
DD
=5V
DIFFERENTIAL MODE
03713-010
Figure 7. AD7934 Typical DNL @ V
DD
= 5 V
CODE
INL ERROR (LSB)
1.0
0.8
0.6
0.4
0.2
–0.2
0
–0.8
–0.6
–0.4
–1.0
0 500 20001000 1500 30002500 40003500
V
DD
=5V
DIFFERENTIAL MODE
03713-011
Figure 8. AD7934 Typical INL @ V
DD
= 5 V