ADS7947_14 Datasheet, PDF (14/39 Pages) Texas Instruments – 12/10/8-Bit, 2MSPS, Dual-Channel, Unipolar, Pseudo-Differential, Ultralow-Power SAR Analog-to-Digital Converters

ADS7947
ADS7948
ADS7949
SLAS708 – SEPTEMBER 2010
www.ti.com
TYPICAL CHARACTERISTICS: ADS7947 (12-Bit) (continued)
At T_A = +25°C, DVDD = 1.8V, V_REF = 2.5V, and f_SAMPLE = 2MSPS, unless otherwise noted.
SNR vs ANALOG SUPPLY VOLTAGE
SNR vs TEMPERATURE
74
73.8
73.6
f_IN = 2kHz
74
AVDD = 3V
73.8 _{fIN = 2kHz}
73.6
73.4
73.4
73.2
73.2
73
73
72.8
72.8
72.6
72.6
72.4
72.4
72.2
72.2
72
2.7
3.2
3.7
4.2
4.7
5.2
5.7
AVDD, Analog Supply Voltage (V)
72
-40 -25 -10
5 20 35 50 65 80
Free-Air Temperature (°C)
95 110 125
Figure 18.
Figure 19.
SNR vs REFERENCE VOLTAGE
74
73.8
73.6
AVDD = 5V
f_IN = 2kHz
73.4
73.2
73
72.8
72.6
72.4
72.2
72
2.5
3
3.5
4
4.5
5
Reference Voltage (V)
Figure 20.
SNR vs INPUT FREQUENCY
74
AVDD = 3V
73.8 _{Throughput = 2MSPS}
73.6
73.4
73.2
73
72.8
72.6
72.4
72.2
72
0
20
40
60
80
100
120
Frequency (kHz)
Figure 21.
SINAD vs ANALOG SUPPLY VOLTAGE
74
f_IN = 2kHz
73.8
73.6
73.4
73.2
73
72.8
72.6
72.4
72.2
72
2.7
3.2
3.7
4.2
4.7
5.2
5.7
AVDD, Analog Supply Voltage (V)
Figure 22.
SINAD vs TEMPERATURE
74
73.8
AVDD = 3V
f_IN = 2kHz
73.6
73.4
73.2
73
72.8
72.6
72.4
72.2
72
-40 -25 -10
5 20 35 50 65 80
Free-Air Temperature (°C)
95 110 125
Figure 23.
14
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