Datasheet

ADS7745
®
FREQUENCY SPECTRUM (±1V, 20kHz Input)
Magnitude (dB)
Input Frequency (kHz)
0
–60
–120
010
–100
–80
–40
–20
20 30 40 50 55
S/(N + D) = 53.1dB
THD = –74.2dB
SNR = 53.1dB
POWER SUPPLY REJECTION
vs SUPPLY RIPPLE FREQUENCY
Power Supply Rejection Ratio (V/V in dB)
Supply Ripple Frequency (Hz)
80
40
10
10 100 1k 10M
60
20
10k 100k 1M
SIGNAL/(NOISE + DISTORTION) vs
INPUT FREQUENCY AND AMBIENT TEMPERATURE
Signal/(Noise + Distortion) (dB)
Input Frequency (kHz)
75
70
65
0.1 1 10 100
–55°C
+25°C
+125°C
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, V
DD
= V
EE
= +5V; Bipolar ±10V Input Range; sampling frequency of 110kHz; unless otherwise specified. All plots use 4096 point FFTs.
FREQUENCY SPECTRUM (±10V, 2kHz Input)
Magnitude (dB)
0
–60
–120
–100
–80
–40
–20
Input Frequency (kHz)
010
20 30 40 50 55
S/(N + D) = 72.6dB
THD = –93.5dB
SNR = 72.6dB
FREQUENCY SPECTRUM (±10V, 20kHz Input)
Magnitude (dB)
Input Frequency (kHz)
0
–60
–120
010
–100
–80
–40
–20
20 30 40 50 55
S/(N + D) = 70.6dB
THD = –77.5dB
SNR = 71.5dB
SPURIOUS FREE DYNAMIC RANGE, SNR AND THD
vs INPUT FREQUENCY
Spurious Free Dynamic Range, SNR, THD (dB)
Input Frequency (kHz)
100
80
60
0.1 1 10 100
90
70
Spurious Free Dynamic Range
Total Harmonic Distortion (THD)
Signal-to-Noise Ratio (SNR)