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.
FREQUENCY SPECTRUM
(4096 Point FFT; fIN = 1,129Hz, –0.2dB)
0
–20
Amplitude (dB)
FREQUENCY SPECTRUM
(4096 Point FFT; fIN = 10.6kHz, –0.2dB)
0
–20
–40
–60
–80
–100
–120
Amplitude (dB)
–40
–60
–80
–100
–120
0
15.6
31.3
Frequency (kHz)
46.9
62.5
0
15.6
31.3
Frequency (kHz)
46.9
62.5
SIGNAL-TO-NOISE RATIO AND SIGNAL-TO-
(NOISE+DISTORTION) vs INPUT FREQUENCY
78
SNR
74
SPURIOUS FREE DYNAMIC RANGE AND TOTAL
HARMONIC DISTORTION vs INPUT FREQUENCY
90
85
SFDR
80
–80
–75
–70
THD
65
60
–65
–60
–55
–50
1
10
Input Frequency (kHz)
100
75
70
–90
–85
SNR and SINAD (dB)
70
SFDR (dB)
66
SINAD
62
58
54
1
10
Input Frequency (kHz)
100
55
50
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
12.0
11.5
Effective Number of Bits
CHANGE IN SIGNAL-TO-(NOISE+DISTORTION)
vs TEMPERATURE
0.4
f
IN
= 10kHz, –0.2dB
0.2
Delta from +25°C (dB)
11.0
10.5
10.0
9.5
9.0
1
10
Input Frequency (kHz)
100
0.0
–0.2
–0.4
–0.6
–0.8
–40
–20
0
20
40
60
80
100
Temperature (˚C)
®
ADS7844
6
THD (dB)
BURR-BROWN [ BURR-BROWN CORPORATION ]
