THS1030_13 Datasheet, PDF (22/39 Pages) Texas Instruments – 3-V TO 5.5-V, 10-BIT, 30MSPS CMOS ANALOG-TO-DIGITAL CONVERTER

THS1030
3ĆV TO 5.5ĆV, 10ĆBIT, 30 MSPS
CMOS ANALOGĆTOĆDIGITAL CONVERTER
SLAS243E − NOVEMBER 1999 − REVISED DECEMBER 2003
PRINCIPLES OF OPERATION
operating configuration examples (continued)
1.4 V
AIN+ ^{1 V}
0.6 V
AVDD
2
AIN
MODE
1.4 V
AIN− 1 V
0.6 V
0.1 µF
REFTS
VREF = 1.6 V
REFBS
RA
REFSENSE
REFTF
RB
0.1 µF
10 µF
0.1 µF
REFBF
Figure 25. Differential Operation
Figure 26 shows a center span configuration for an input waveform swinging between 0.2 V and 1.9 V. Pins
REFTS and REFBS are connected to a voltage source of 1.05 V, equal to the mid-scale of the input waveform.
REFTF−REFBF should be set equal to the span of the input waveform, 1.7 V, so VREF is connected to an
external source of 1.7 V. REFSENSE must be connected to AV_DD to disable the ORG output to VREF (see
Figure 23) to allow this external source to be applied.
1.9 V
1.05 V
0.2 V
DC SOURCE = 1.05 V
AVDD
2
AIN
MODE
REFSENSE
REFTS
AVDD
REFBS
0.1 µF
REFTF
VREF
DC SOURCE = 1.7 V
0.1 µF
10 µF 0.1 µF
REFBF
Figure 26. Center Span Operation
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