ADS7818E Datasheet, PDF (6/21 Pages) Texas Instruments – 12-Bit High Speed Low Power Sampling ANALOG-TO-DIGITAL CONVERTER

TYPICAL PERFORMANCE CURVES (Cont.)
At T_A = +25°C, V_CC = +5V, f_SAMPLE = 500kHz, f_CLK = 16 • f_SAMPLE, and internal +2.5V reference, unless otherwise specified.
0
–20
–40
–60
–80
–100
–120
0
FREQUENCY SPECTRUM
(4096 Point FFT; f_IN = 247kHz, –0.2dB)
62.5
125
187.5
250
Frequency (kHz)
SIGNAL-TO-NOISE RATIO and
SIGNAL-TO-(NOISE+DISTORTION)
vs INPUT FREQUENCY
76
74
SNR
72
SINAD
70
68
66
64
1k
10k
100k
1M
Input Frequency (Hz)
SPURIOUS FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTION
vs INPUT FREQUENCY
90
SFDR
85
THD^h
80
75
70
h _{First nine harmonics}
of the input frequency
65
1k
10k
100k
Input Frequency (Hz)
–90
–85
–80
–75
–70
–65
1M
CHANGE IN SIGNAL-TO-NOISE RATIO
and SIGNAL-TO-(NOISE+DISTORTION)
vs TEMPERATURE
0.3
0.2
SNR
0.1
0.0
SINAD
–0.1
–0.2
f_IN = 100kHz, –0.2dB
–0.3
–40 –20
0
20
40
60
Temperature (°C)
80 100
CHANGE IN SPURIOUS FREE DYNAMIC RANGE
AND TOTAL HARMONIC DISTORTION
vs TEMPERATURE
1.0
–1.0
f_IN = 100kHz, –0.2dB
0.5
–0.5
0.0
THD^h
0.0
–0.5
0.5
SFDR
–1.0
1.0
–1.5 _{h First nine harmonics}
of the input frequency
–2.0
–40 –20
0
20
40
60
Temperature (°C)
1.5
2.0
80 100
®
ADS7818
6