Datasheet

ADS7844
6
SBAS100A
www.ti.com
0
–20
–40
–60
–80
–100
–120
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 1,129Hz, –0.2dB)
0 62.515.6 46.931.3
Frequency (kHz)
Amplitude (dB)
0
–20
–40
–60
–80
–100
–120
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 10.6kHz, –0.2dB)
0 62.515.6 46.931.3
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)
78
74
70
66
62
58
54
SINAD
SNR
THD
SFDR
SPURIOUS FREE DYNAMIC RANGE AND TOTAL
HARMONIC DISTORTION vs INPUT FREQUENCY
101 100
Input Frequency (kHz)
SFDR (dB)
THD (dB)
90
85
80
75
70
65
60
55
50
–90
–85
–80
–75
–70
–65
–60
–55
–50
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
101 100
Input Frequency (kHz)
Effective Number of Bits
12.0
11.5
11.0
10.5
10.0
9.5
9.0
TYPICAL PERFORMANCE CURVES:+2.7V
At T
A
= +25°C, +V
CC
= +2.7V, V
REF
= +2.5V, f
SAMPLE
= 125kHz, and f
CLK
= 16 • f
SAMPLE
= 2MHz, unless otherwise noted.
CHANGE IN SIGNAL-TO-(NOISE+DISTORTION)
vs TEMPERATURE
–20–40 100
Temperature (˚C)
Delta from +25°C (dB)
0.2
0.0
–0.2
–0.4
–0.6
–0.8
0.4
0 20 40 60 80
f
IN
= 10kHz, –0.2dB