THS1031 Datasheet, PDF (18/26 Pages) Texas Instruments – 2.7 V . 5.5 V, 10-BIT, 30 MSPS CMOS ANALOG-TO-DIGITAL CONVERTER

THS1031
2.7 V – 5.5 V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS242A – NOVEMBER 1999 – REVISED JANUARY 2000
PRINCIPLES OF OPERATION
analog input mode(continued)
D Internal ADC Reference Mode With Common Mode Input V_REF/2: The input common mode is set to
V_REF/2 by connecting REFTS to V_REF and REFBS to AV_SS. The input signal at AIN will swing between V_REF
and AV_SS.
2V
AIN
1V
THS1031
REFTS
SHA
PGA
A/D
1.5 V
REFBS
AVDD
MODE
ADC
REF
REFTF
0.1 µF
VREF
REFSENSE
+
–+
_
1V
0.1 µF
REFBF
10 µF
0.1 µF
Figure 18. Common Mode Input V_REF/2 With 1-V Internal Reference
2V
AIN
0V
REFTS
THS1031
SHA
PGA
A/D
REFBS
AVDD ^MODE
VREF
REFSENSE
+
–+
_
1V
ADC
REF
REFTF
0.1 µF
REFBF
0.1 µF
10 µF
0.1 µF
Figure 19. Common Mode Input V_REF/2 With 2-V Internal Reference
18
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