VESTEL 17MB12, Service Manual

Page: 26 / 64

ƒ 2 AGC control signals available for RF and IF amplifier control
ƒ Flexible clock reference options
ƒ Re-use of 4 MHz tuner clock reference
ƒ Pre-SAW sense input for optimal RF AGC setting and RF-level measurement
™ Excellent digital reception performance:
ƒ Superior digital and analog adjacent channel performance (> − 40dB for QEF)
ƒ Impulsive noise cruncher
ƒ Multipath and dynamic echoes
™ The input IF frequency ranging up to 44 MHz ensures upward compatibility for new
tuner topologies
™ Integrated microprocessor to perform autonomous detection and operation of all
possible DVB-T
modes, without interaction with the host processor
™ Fully automatic and fast signal acquisition: UHF and VHF band-scan in <20 seconds
™ Meets all international DVB-T receiver specifications: Nordig Unified, DTG, EICTA
™ Comfortable software drivers for integration of tuner and COFDM demodulator
™ Secondary serial interface for tuner control
™ 5 V tolerant AGC and secondary serial protocol outputs
™ 2 general purpose I/O pins (GPIO)
™ Configurable parallel or serial MPEG-TS output
™ PMQFP64-2 package: footprint 10 10 mm (DRX 3973D)
™ PQFN48-1 package: small footprint 7 7 mm (DRX 3977D)
™
IEEE 1149.1 boundary scan
11.3 Applications
™ IDTV / hybrid TV
™ Set-top boxes
™ PVR / DVDR
™ Network interface modules (NIM)
™ PC-TV applications
12 PI6CX100-27MHz 3.3V VCXO for Set-Top Box Applications
12.1 Features
™ • 3.3V operating voltage
™ • Uses an inexpensive external crystal
™ • On-chip VCXO with pull range of 240ppm
™ • VCXO tuning voltage from 0 to 3.3V
™ • 10mA output drive at CMOS levels
™ • Available in SOIC package
12.2 Description
The PI6CX100-27 is a low-cost, high-performance 3.3V VCXO, designed to replace
expensive VCXO modules. The on-chip Voltage Controlled Crystal Oscillator accepts a