ADS7056
ZHCSG66 –MARCH 2017
www.ti.com.cn
Typical Applications (continued)
9.2.1.3 Application Curves
Figure 45 and Figure 46 provide the measurement results for the circuit described in Figure 43.
0
-50
0
-50
-100
-150
-200
-100
-150
-200
0
250
500
750
1000
1250
0
250
500
750
1000
1250
Frequency (kHz)
Frequency (kHz)
D036
D037
SNR = 75.8 dB, THD = –90.1 dB, SINAD = 75 dB
SNR = 75 dB, THD = –88.7 dB, SINAD = 74.3 dB
Figure 45. Test Results for the ADS7056 and OPA836 for a
2-kHz Input
Figure 46. Test Results for the ADS7056 and OPA836 for a
100-kHz Input
9.2.2 High Bandwidth (1 MHz) Data Acquisition With the ADS7056
Analog Power Supply for
ADC
REF1933
AVDD(+3.3V)
(AVDD + 0.2V) to 5.5 V
1uF
VIN
VOUT
GND
3.3uF
499Ω
VDD(+6V)
499Ω
10 ꢀ
œ
33 ꢀ
33 ꢀ
AVDD
SCLK
CS
AINP
+
VSOURCE
33 ꢀ
+
Host
Controller
œ
THS4031
470pF
Device
SDO
VCM
(+0.825 V)
AINM
VSS(-6V)
GND
Device: 14 Bit , 2.5 MSPS,
Single-Ended Input
Figure 47. High Bandwidth DAQ Circuit
26
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