vu+ zero เป็น single tunner ไม่เหมือนกับ Duo2
ถ้ารับไม่ได้จริงนี่คงพับแผนซื้อ Vu+Duo2 ไปก่อน
AVL6211, DVB-S2/S Demodulator
时间: 2014-04-01 来源: 深圳中科君浩科技股份有限公司
Description:
The AVL6211 is a highly integrated DVB-S2 and DVB-S channel receiver IC. It converts a baseband analog IQ signal from a satellite tuner and performs a set of sophisticated demodulating and decoding operations to output an MPEG video/audio stream. The AVL6211 provides simple and flexible control via a standard two-wire bus.
The AVL6211 includes dual, differential, high performance, analog to digital converters (ADC) with a built-in compensation circuit for DC offset and IQ imbalance. An RF AGC output is provided for simple gain control of the satellite tuner via an RC network.
After passing a timing recovery loop and frequency recovery loop, the signal samples are further processed by an equalizer to output decision bits to an FEC decoder. The decoded bits are finally packetized in the MPEG interface block.
The configuration of the AVL6211 is easily performed through a set of registers via a standard two-wire bus. To simplify the interface to the host system, this same two-wire bus is used to communicate with the separate tuner two-wire bus and the DiSEqC™ interface to the LNB.
The AVL6211 can achieve fast acquisition at frequency offsets up to 5 MHz and maintains synchronization under the most severe front-end phase noise.
Features:
High performance QPSK/8PSK satellite TV receiver
64 pin LQFP in 7x7 mm package
Low 250 - 270 mW power (clear sky)**
Low 330 - 460 mW power (threshold)**
DVB-S2:
Data Rate: QPSK 1-55 Msps
Data Rate: 8PSK 1-45 Msps
Code Rates: 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9 and 9/10
Roll-off factors for pulse shaping: 0.2, 0.25 and 0.35
DVB-S:
Data Rate: 1-55 Msps
Code Rates: 1/2, 2/3, 3/4, 5/6, 7/8
Directly interfaces with tuner for easy implementation
Integrated dual A/D converters
Fast automatic blind scan of symbol rates and carrier frequencies
Carrier frequency acquisition range: ±5MHz for symbol rates above 3 Msps and ±3MHz for the remaining symbol rates
Signal quality and BER/PER monitors
Equalizer compensates for channel impairment
Standard two-wire serial bus with two selectable addresses for easy chip configuration
Multi-purpose modulator for DiSEqC™ applications
Standard MPEG-2 transport output parallel and serial interfaces
Software controlled tri-state MPEG and RFAGC outputs
Software controlled LNB interface (GPIOs)
