TSA1203IFT-E View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSA1203IFT-E' PDF : 30 Pages View PDF
Application information
Figure 26. AC-coupled differential input
50Ω
common
mode
10nF
33pF
50Ω 10nF
100kΩ
100kΩ
VIN
INCM TSA1203
VINB
TSA1203
Figure 26 represents the biasing of a differential input signal in an AC-coupled differential
input configuration. Both inputs VIN and VINB are centered around the common mode
voltage, which can be left internal, or fixed externally.
Figure 27. DC-coupled 2 Vpp differential analog input
analog
DC
analog
DC
VREFP-VREFM = 1 V
AC+DC
VIN VREFP
TSA1203
VINB VREFM
INCM
330pF 10nF 4.7µF
VINCM = 0.5 V
Figure 27 shows a DC-coupled configuration with forced VREFP and INCM to the 1V DC
analog input while VREFM is connected to ground; the differential amplitude obtained is
2 Vpp.
8.4
Clock input
The quality of your TSA1203 converter is very dependent on your clock input accuracy, in
terms of aperture jitter; the use of a low jitter crystal controlled oscillator is recommended.
Further points to consider in your implementation are:
● The duty cycle must be between 45% and 55%.
● The clock power supplies must be independent from the ADC output supplies to avoid
digital noise modulation on the output.
● When powered-on, the circuit needs several clock periods to reach its normal operating
conditions. Therefore, it is recommended to keep the circuit clocked to avoid random
states before applying the supply voltages.
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