Datasheet

5
®
ADS7825
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, f
S
= 40kHz, V
S1
= V
S2
= +5V, using internal reference, unless otherwise noted.
FREQUENCY SPECTRUM
(8192 Point FFT; f
IN
= 1.02kHz, –0.5dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0 5 10 15 20
Amplitude (dB)
Frequency (kHz)
–60.0
–70.0
–80.0
–90.0
–100.0
–110.0
–120.0
–130.0
–140.0
CROSSTALK vs INPUT FREQUENCY
(Active Channel Amplitude = –0.1dB)
100 1k
Active Channel Input Frequency (Hz)
Resulting Amplitude on Selected Channel (dB)

(Input Grounded)
10k 100k
Adjacent Channels, Worst Pair
Non-Adjacent Channels
Adjacent Channels
Measurement Limit
ADJACENT CHANNEL CROSSTALK, WORST PAIR
(8192 Point FFT; AIN
3
= 1.02kHz, –0.1dB; AIN
2
= AGND)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0 5 10 15 20
Amplitude (dB)
Frequency (kHz)
ADJACENT CHANNEL CROSSTALK, WORST PAIR
(8192 Point FFT; AIN
3
= 10.1kHz, –0.1dB; AIN
2
= AGND )
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0 5 10 15 20
Amplitude (dB)
Frequency (kHz)
100
90
80
70
60
50
40
30
100
Input Signal Frequency (Hz)
SINAD (dB)
SIGNAL-TO-(NOISE + DISTORTION)
vs INPUT FREQUENCY (f
IN
= –0.1dB)
1k 10k 100k
100
90
80
70
60
50
40
30
20
10
0
Input Signal Frequency (kHz)
SINAD (dB)
SIGNAL-TO-(NOISE + DISTORTION)
vs INPUT FREQUENCY AND INPUT AMPLITUDE
2 4 6 8 10 12 14 16 18 20
0dB
–20dB
–60dB