AT7400
Owner Manual Rev. 2.0 – October 2006-10-23
Section 3 - 8/39
3.1.3. PCB CIM3445 – Master Clock - Block Diagram
3.1.4. PCB CIM3445 – General Functional Description
The 172.16MHz frequency is synthesized via a PLL, a VCO and a DDS circuit. The 10MHz reference is one out of
the two inputs of the phase comparator. This signal comes to CIP8358 via a SMB connector, CON-2. The second
one is also a 10MHz generated by the DDS circuit out from the free running 172.16MHz oscillator.
The loop filter performs the integration of the phase comparator output, generating the error signal that is feed
back to the VCO. On this way the VCO is locked to the reference signal.
The oscillator signal is delivery via 3 connectors. Two of those are routed to the 8VSB Modulator, PCB CIM3444,
and the third one is routed to the DDS circuit, module 4456.
3.2. Module 4453 - UHF ATSC Up-Converter
The Up-Converter module is composed by the mixer circuitry, PCB CIM3442, and a local oscillator, PCB
CIM3443.
Содержание AT7400
Страница 11: ...AT7400 Owner Manual Rev 2 0 October 2006 10 23 Section 1 6 7 6 6 4 Digital Modulation Error Rate...
Страница 12: ...AT7400 Owner Manual Rev 2 0 October 2006 10 23 Section 1 7 7 7 6 5 Conducted Spurious Emissions...
Страница 32: ...AT7400 Owner Manual Rev 2 0 October 2006 10 23 Section 3 11 39 3 3 1 PCB CIM3442 UHF Mixer Block Diagram...
Страница 33: ...AT7400 Owner Manual Rev 2 0 October 2006 10 23 Section 3 12 39 3 3 2 PCB CIM3442 UHF Mixer Test Points Diagram...
Страница 35: ...AT7400 Owner Manual Rev 2 0 October 2006 10 23 Section 3 14 39 3 5 Module 4466 External Connections...
Страница 51: ...AT7400 Owner Manual Rev 2 0 October 2006 10 23 Section 3 30 39 3 10 1 Module 4456 Block Diagram...
