VESTEL 17MB45-2, Service Manual

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13
6 INTEGRATED DVB-T RECEIVER (CHEERTEK)
6.1 General Description
CT216T is a highly integrated single chip for DVB-T compliant STB solution. Compared
with Cheertek's previous generations of STB receiver devices. CT216T further interates
COFDM demodulator USB 2.0 HS host controller, memory card reader, 1/2-bit SPIFlash
interface, audio DAC, PWM in/out and SAR-ADC functions. In additiont special
enhangements are provided such as MPEG-4 video decoding, 16-bit OSD with anti-flickering,
HW JPEG decoding, flesh tone and black-white extensions, and improvement of small video
quality.
CT216T includes COFDM demodulator transport stream de-multiplexer, DVB-CSA
compliant de-scrambler, RISC MPUs, MPEG-1/2/4 AV decoder, digital T\/ encoder, audio
DACs, USB 2.0 HS host controller, memory card reader, smart card reader, CI controller and
other peripherals.
Cli216T is designed in focus on the market of single tuner input product which makes, it a
cost effective solution. Supports include free to air, conditional access for SC (Smart card)
and CI portable devices, PVR, LCD TV, and other DVB-T applications.
Digital Front End Diagram:
6.2 Features
COFDM Demodulator

ETSI EN 300 744 DVB-T NorDig Unified 1.0.3, and D-book compliant

Automatic spectral inversion, detection

Integrated ADC

Direct IF (36.167 MHz or 43.75 MHz) or low IF (4.57 MHz) supported

Single IF AGC or dual RF/lF AGC controls with ΔΣ modulabon

Impulsive noise cancellation

Carrier acquisition range: ±400 kHz (extensible to ±600 kHz in 8MHz BW)