THS0842 Datasheet, PDF (23/29 Pages) Texas Instruments – DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER WITH SINGLE OR DUAL PARALLEL BUS OUTPUT

THS0842
DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER
WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
SLAS246 – DECEMBER 1999
PRINCIPLES OF OPERATION
analog input, single-ended connection (continued)
The single ended analog input can be dc coupled (Figure 24) as long as the input is within the analog input
common mode voltage range. A capacitor, C, connected from I/Q IN+ to I/Q IN– will help filter any high frequency
noise on the inputs, also improving performance. Note, that the value of capacitor C chosen must take into
account the highest frequency component of the analog input signal.
2V
Single
Ended
Input
1.5 V
1.0 Vp–p
1V
Figure 22. Single-Ended Input Waveform
A single-ended source may give better overall system performance if it is first converted to differential before
driving the THS0842.
VIN
C1
THS0842
R
AIN+
R
C2
+
VBIAS
AIN–
CML
REFT
REFB
Figure 23. AC-Coupled Input
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