Datasheet

AD7943/AD7945/AD7948
REV. B–12–
INPUT CODE
1.00
0.50
–1.00
0 4095
1024
LINEARITY ERROR – LSBS
2048 3072
0.00
–0.50
V
DD
= +3.3V
V
REF
= 0V
V
BIAS
= 1.23V
OP AMP = AD820
T
A
= +258C
Figure 9. All Codes Linearity in Biased Mode
(V
DD
= +3.3 V)
FREQUERCY – Hz
–50
–55
–100
100 100k1k
THD – dBs
10k
–80
–85
–90
–95
–70
–75
–60
–65
V
DD
= +5V
T
A
= +258C
V
IN
= 6V rms
OP AMP = AD711
Figure 10. Total Harmonic Distortion vs. Frequency
10
0%
100
90
200ns
5V
200ns
50mV
V
DD
= +5V
T
A
= +258C
V
REF
= 0V
OP AMP = AD711
AD711 OUTPUT
Figure 11. Digital-to-Analog Glitch Impulse
FREQUENCY – Hz
0
–10
–100
1k 10M10k 100k 1M
–40
–70
–80
–90
–20
–30
–60
–50
V
DD
= +5V
T
A
= +258C
V
IN
= 20V p-p
OP AMP = AD711
DAC LOADED WITH ALL 0S
DAC LOADED WITH ALL 1S
Figure 12. Multiplying Frequency Response vs.
Digital Code