Datasheet

ADS7844
5
SBAS100A
www.ti.com
TYPICAL PERFORMANCE CURVES:+5V
At T
A
= +25°C, +V
CC
= +5V, V
REF
= +5V, f
SAMPLE
= 200kHz, and f
CLK
= 16 • f
SAMPLE
= 3.2MHz, unless otherwise noted.
0
–20
–40
–60
–80
–100
–120
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 1,123Hz, –0.2dB)
0 10025 7550
Frequency (kHz)
Amplitude (dB)
0
–20
–40
–60
–80
–100
–120
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 10.3kHz, –0.2dB)
0 10025 7550
Frequency (kHz)
Amplitude (dB)
SIGNAL-TO-NOISE RATIO AND SIGNAL-TO-
(NOISE+DISTORTION) vs INPUT FREQUENCY
101 100
Input Frequency (kHz)
SNR and SINAD (dB)
74
73
72
71
70
69
68
SINAD
SNR
SPURIOUS FREE DYNAMIC RANGE AND TOTAL
HARMONIC DISTORTION vs INPUT FREQUENCY
101 100
Input Frequency (kHz)
SFDR (dB)
THD (dB)
85
80
75
70
65
–85
–80
–75
–70
–65
THD
SFDR
12.0
11.8
11.6
11.4
11.2
11.0
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
101 100
Input Frequency (kHz)
Effective Number of Bits
CHANGE IN SIGNAL-TO-(NOISE+DISTORTION)
vs TEMPERATURE
–20–40 100
Temperature (°C)
Delta from +25°C (dB)
0.4
0.2
0.0
–0.2
–0.4
–0.6
0.6
0 20 40 60 80
f
IN
= 10kHz, –0.2dB