THS1030 Datasheet, PDF (18/22 Pages) Texas Instruments – 2.7 V . 5.5 V, 10-BIT, 30 MSPS CMOS ANALOG-TO-DIGITAL CONVERTER

THS1030
2.7 V – 5.5 V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS243A – NOVEMBER 1999 – REVISED JANUARY 2000
PRINCIPLES OF OPERATION
single-ended input (continued)
2V
1V
1.5 V
AVDD
AIN
REFTS
REFBS
MODE
VREF
REFSENSE
THS1030
SHA
+
–+
_
1V
ADC
REF
A/D
REFTF
0.1 µF
REFBF
0.1 µF
10 µF
0.1 µF
Figure 18. Common Mode Input V_REF/2 With 2-V Internal Reference
differential input
In this mode, the first differential input is applied to the AIN pin and the second differential input is applied to the
common point where REFTS and REFBS are tied together. The common mode of the input should be set to
AV_DD/2 as shown in Figure 19. The maximum magnitude of the differential input signal should be equal to V_REF.
VREF
THS1030
AIN
AVDD/2
REFTS
SHA
A/D
REFBS
MODE
AVDD
VREF VREF is either internal or external
ADC
REF
REFTF
0.1 µF
REFBF
0.1 µF
10 µF
0.1 µF
Figure 19. Differential Input
18
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