12.3.PNX3000 (IC400)
12.3.1.General Description
The PNX3000 is an analog front end for digital video processors. It contains an IF circuit for both analog
and digital broadcast signals, and input selectors and A to D converters for analog video and audio
signals. The digital output signals are made available via three serial data links.
The IC has a supply voltage of 5V. The supply voltage of the analog audio part can be 5V or 8V,
depending on the maximum signal amplitudes that are required.
12.3.2.Features
? Multi-standard vision IF circuit with alignment -free PLL demodulator without external components
? Internal (switchable) time -constant for the IF -AGC circuit
? DTV IF circuit for gain control of digital broadcast TV sign als.
? Sound IF amplifier with separate AGC circuit for quasi split sound
? IF circuit can also be used for intercarrier sound
? Analog demodulator for AM sound
? Integrated sound trap and group delay correction
? Video ident function detects the presence of a video signal
? Video source selector with 4 external CVBS or YC inputs and 2 analog CVBS outputs with
independent source selection for each output
? Two linear inputs for 1fH or 2fH RGB signals with source selector. The RGB signals are converted to
YUV before A to D conversion. Both inputs can also be used as YPB PR input for DVD or set top box
? Integrated anti-alias filters for video A to D converters
? Four 10 -bit video A to D converters for the conversion of CVBS, YC, YUV and down mixed sound IF
signals
? Up to three different A to D converted video channels are simultaneous available (e.g. CVBS and YC
and YUV)
? Audio source selector with 5 stereo inputs for analog audio and two microphone inputs
? Two microphone amplifiers with adjustable gain
? T hree analog audio outputs for SCART and Line out with independent source selection for each
output
? Four 1-bit audio sigma delta A to D converters for the conversion of audio and microphone signals
? Three serial data link transmitters for interfacing with the digital video processor. The bit rate is 594
Mbits/sec per data link
? Voltage to current converter for driving of external East -West power amplifier
2
? IC-bus transceiver with selectable slave address and maskable interrupt output
9
AK53 D.O.C. Service Manual 22/03/2004 |