Datasheet

-86.8
87
87.2
87.4
87.6
87.8
88
88.2
88.4
-
-
-
-
-
-
-
-
2.7
5.7
AVDD,AnalogSupplyVoltage(V)
TotalHarmonicDistortion(dB)
3.2 4.7
f =2kHz
IN
4.23.7 5.2
-87.75
87.8
87.85
87.9
87.95
88
88.05
88.1
-
-
-
-
-
-
-
-40
125
Free-AirTemperature( C)°
TotalHarmonicDistortion(dB)
-25 20
AVDD=3V
f =2kHz
IN
5-10 35 50 65 80 95 110
-86
86.5
87
87.5
88
88.5
89
89.5
90
-
-
-
-
-
-
-
-
0
120
InputFrequency(kHz)
TotalHarmonicDistortion(dB)
20 6040 10080
-86
86.2
86.4
86.6
86.8
87
87.2
87.4
-
-
-
-
-
-
-
2.5
5
Reference,V (V)
REF
TotalHarmonicDistortion(dB)
3 43.5
AVDD=5V
f =2kHz
IN
4.5
0
20
40
60
80
100
120
140
-
-
-
-
-
-
-
0
350
InputFrequency(kHz)
Crosstalk(dB)
50 150100 300200 250
AVDD=3V
IsolationCrosstalk
MemoryCrosstalk
0
20
40
60
80
100
120
140
160
-
-
-
-
-
-
-
-
0
1M
Frequency(Hz)
Amplitude(dB)
100k 300k200k 900k400k 500k
SNR=73.1dB
THD= 87.5dB
SINAD=72.9dB
SFDR=90.6
f =100kHz
-
IN
800k700k600k
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.
SFDR vs AVDD SFDR vs TEMPERATURE
Figure 30. Figure 31.
THD vs REFERENCE VOLTAGE THD vs INPUT FREQUENCY
Figure 32. Figure 33.
SPECTRAL RESPONSE
CROSSTALK vs INPUT FREQUENCY
(1)
(8192-Point FFT)
(1) Memory crosstalk is the effect of the last converted channel on
the current converted channel data. Isolation crosstalk is the effect
on the channel being converted that is coming from the signal on the
channel that is off.
Figure 34. Figure 35.
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