PS20353 Datasheet, PDF (25/27 Pages) List of Unclassifed Manufacturers – Nordig Unified DVB-T COFDM Terrestrial Demodulator

PS20353
OSCOUT signal cannot be guaranteed in such a configuration.
• AC coupling of a single ended external clock to XTI, with OSCMODE = 1, is possible. It is recommended that
the circuit shown in Figure 15 be used to correctly bias the oscillator inputs: The common-mode voltage VCM
for XTI and XTO, (set by the 36 kΩ and 22 kΩ resistors) must be in the range 800 mV to CVdd and the
amplitude Vpp of the clock signal must be >100 mV. See Figure 15.
Figure 15 - External Clocking
• External, differential clock signals may be applied to XTI and XTO if OSCMODE = 1. The common-mode
voltage VCM for the differential clock signals must be in the range 800 mV to CVdd, and the peak-to-peak
signal amplitude Vpp must be >100 mV. It is recommended that differential clock signals have V_CM = 1.0V. For
Vpp > 400 mV a resistor of ≥ 390 Ω in series with XTI or XTO may be required to limit the current taken from or
supplied to the clock sources.
PLESSEY SEMICONDUCTORS LTD
TAMERTON ROAD | ROBOROUGH | PLYMOUTH | DEVON | PL6 7BQ
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