Datasheet

75
77
79
81
83
85
−40 −25 −10 5 20 35 50 65 80 95 110 125
Free-Air Temperature (°C)
Signal−to−Noise and Distortion (dB)
f
IN
= 20 kHz
G023
75
77
79
81
83
85
0 20 40 60 80 100
f
IN
, Input Frequency (kHz)
Signal−to−Noise and Distortion (dB)
G025
−100
−96
−92
−88
−84
−80
2.7 3.2 3.7 4.2 4.7 5.2 5.7
AVDD,Analog Supply Voltage (V)
Total Harmonic Distortion (dB)
f
IN
= 20 kHz
G030
−100
−96
−92
−88
−84
−80
2.5 3 3.5 4 4.5 5 5.5
Reference Voltage (V)
Total Harmonic Distortion (dB)
AVDD = 5.25 V
f
IN
= 20 kHz
G032
−100
−96
−92
−88
−84
−80
−40 −25 −10 5 20 35 50 65 80 95 110 125
Free-Air Temperature (°C)
Total Harmonic Distortion (dB)
AVDD = 3 V
f
IN
= 20 kHz
G031
−100
−96
−92
−88
−84
−80
0 20 40 60 80 100
f
IN
, Input Frequency (kHz)
Total Harmonic Distortion (dB)
AVDD = 3 V
G033
ADS7945
ADS7946
www.ti.com SBAS539B –JUNE 2011– REVISED SEPTEMBER 2011
TYPICAL CHARACTERISTICS: ADS7945 (continued)
At T
A
= +25°C, AVDD = 5 V, DVDD = 1.8 V, V
REF
= 2.5 V, and f
SAMPLE
= 2 MSPS, unless otherwise noted.
SINAD vs FREE-AIR TEMPERATURE SINAD vs INPUT FREQUENCY
Figure 19. Figure 20.
THD vs ANALOG SUPPLY VOLTAGE THD vs REFERENCE VOLTAGE
Figure 21. Figure 22.
THD vs FREE-AIR TEMPERATURE THD vs INPUT FREQUENCY
Figure 23. Figure 24.
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