飞利浦DVB-C机顶盒方案TDA8274+TDA10023HT+PNX831x

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Philips Semiconductors’ complete cable system solution eases the path to production-ready set-top boxes (STBs) for the low-end cable market. Drastically reducing time-tomarket and development costs for the introduction of new STB systems, it allows manufacturers, OEMs and ODMs to focus their resources on added-value features and product differentiation.

 

Philips Semiconductors’ cable system solution brings value and brand differentiation to low-cost DVB-C applications. A turnkey system solution for digital cable reception, it enables manufacturers, OEMs and ODMs to bring low-cost DVB-C STBs to market quickly and easily.

 

It is based on the PNX831x MPEG-2 source decoder, the highly integrated TDA8274HN silicon tuner and the TDA10023HT DVB-C channel decoder. Together, the TDA8274HN and TDA10023HT offer a sophisticated yet cost-effective receiver for digital cable tuning and decoding. The PNX831x provides single-chip media processing and control for low-cost digital STBsystems. Combined with the UDA1334BTS low-power audio DAC, these ICs form a highly affordable and extremely efficient solution for a variety of digital STB and TV applications.

 

As part of a complete development roadmap, this system solution provides the ideal starting point for introducing consumers to digital TV. Highly programmable, it frees equipment manufacturers from continual system re-design and enables development to be concentrated on added-value and branding features. It also provides the freedom to create products tailored to specific requirements, offering manufacturers the flexibility and potential to build multi-market products such as combined DVD+RW/DVB systems.

With the rapid growth in the Indian and Chinese markets, Philips Semiconductors allows OEMs and ODMs to target these huge markets with a limited R&D outlay and still deliver a cost-effective solution in a very short time frame.

 

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Applications

• Set-top boxes (STB) for digital cable television (DVB-C)

• Can be integrated into DVD+RW recorders, DVD players,VCR and PC-TV solutions

• Nexperia PNX831x MPEG-2 source decoder

• Cable front end

- TDA8274HN multi-standard silicon tuner

- TDA10023HT DVB-C channel receiver

• UDA1334BTS low-power, 24-bit stereo audio DAC

• SPDIF digital audio output

• Smart Card reader NDS compatible (TDA8004)

• 2 layer PCB class 4, Single sided component

• On-board front panel (LED + Ir receiver)

• CVBS & S-video output

• External modem connection

• Optional external smart card, power supply and front panel board

• 4 Mbytes Flash, 16 Mbytes SDRAM

• Banner for displaying ‘Now & Next’ and channel (name, date and time) information

• Specifically developed, customized remote control

 

Philips Semiconductors’ cable system solution provides a comprehensive package, including key ICs, reference board, software (drivers and adaptation layer) and third party applications (Middleware), as well as Philips world-class logistics and quality management. The system is completed with software stacks including Graphical User Interface (GUI) applications. In addition, Philips can provide technical support for customers wanting to port their own applications onto the final product.

 

TDA8274HN multi-standard silicon tuner

A giant leap forward in RF integration, the TDA8274 features an embedded low-noise input amplifier and an image rejection mixer for processing RF signals. It also downconverts signals to low IF before filtering and sending them to the channel decoder. The TDA8274 delivers optimal partitioning of functions at the system level, removing the need for both SAW filters and IF amplifiers. All this integration results in very low power consumption so external heat sinks are not required, further simplifying the design-in process.

Offering the necessary selectivity for all targeted applications, the TDA827x silicon tuner also features a fully integrated VCO with no external tank component, removing the need for high-voltage tuning of the oscillator. It also includes an RF splitter with two separate outputs, and an RSSI signal indicator embedded on the IC.

• Real silicon tuner approach: Only 30 SMD components for the Bill of Material (BOM)

• Wideband low-noise RF amplifier with AGC

• RF splitter with 2 separate outputs (-2 / +6 dB)

• RF filter

• Image rejection mixer stage

• Fully integrated VCO

• Integrated 16 MHz crystal oscillator and output buffer to channel decoder or other tuner

• I²C bus controlled

• 40-pin metal lead-frame HVQFN40 package (6 mm x 6 mm)

 

TDA10023HT DVB-C channel receiver

The TDA10023HT is a single chip cable channel receiver for 4, 16, 32, 64, 128 and 256 QAM modulated signals. It interfaces directly to the IF signal, which is sampled by a 10-bit analog-to-digital converter. The chip performs both clock and carrier recovery functions, with programmable digital loop filters allowing their characteristics to be optimized according to the current application.

• Fully compliant DVB-C (Annex A and C) and MCNS (Annex B) decoders

• Multiple TS JQAM filter

• 4/16/32/64/128/256 QAM demodulator

• High performance for 256 QAM for direct IF applications

• On-chip 10-bit ADC and PLL for crystal frequency multiplication

• Digital filtering embedded to interface seamlessly with the TDA827x silicon tuner family

• Carrier recovery acquisition range +/- 15 % of symbol rate

• Clock recovery acquisition range up to + 12 %

• Auto-scan compatible (software to be developed)

• Double AGC loop structure with programmable take over points

• Automatic Nyquist filter gain setting

• 26 taps integrated adaptive equalizer (Transversal or DFE)

• Simultaneous parallel and serial transport stream outputs

• Works with a low frequency crystal: typically 16 MHz or lower

• CMOS 0.16 µm / 1.8 V (core) & 3.3 V (periphery) technology

• TQFP 64 package (10x10 mm) fully pin-to-pin compatible with the former TDA10021

 

UDA1334BTS low-power audio DAC

The UDA1334BTS is a low power audio DAC that supports the I2S-bus data format with word lengths of up to 24 bits and the LSB-justified serial data format with word lengths of 16, 20 and 24 bits. It includes basic audio features such as de-emphasis and mute.

 

• 1.8 to 3.6 V power supply voltage

• Integrated digital filter plus DAC

• Supports sample frequencies from 8 to 100 kHz

• Low power consumption

• Multiple format data interface:

- I2S-bus and LSB-justified format compatible

- 1 fS input data-rate

• DAC digital sound processing

• Digital de-emphasis for 44.1 kHz sampling rate

• Mute function

• Advanced audio configuration

• High linearity, wide dynamic range and low distortion

• Standby or sleep mode in which the DAC is powered down

 

PNX831x source decoder

The Nexperia PNX831x family offers a straightforward solution for low-cost digital STBs and iDTV systems. These ICs are equally suited to basic and mid-range STBs for free-to-air (FtA) or pay television. They deliver high performance through the combination of a unified memory architecture (UMA), a 16-bit high-speed memory bus and an efficient 120 MHz, 32-bit MIPS RISC CPU core.

 

• Supports all DVB / MPEG-2 compliant transmissions

• Dedicated transport RISC based demultiplexer engine and DVB descrambler with ICAM option meet most DVB based pay-TV specifications and frees the MIPS processor to execute other tasks

• High-performance MIPS CPU in conjunction with dedicated STB hardware and on-chip audio DSP deliver excellent digital STB performance from a single chip

• External data connectivity through USB 1.1 host interface and two full UARTs (230 kb/s)

• ISO7816 smart card interface suitable for one or two (non simultaneous) readers

• NTSC, PAL, and SECAM digital encoder with 6 DACs (Macrovision 7.1 option)

• Digital Video Interface (ITU-R 656) available for use in flat panel displays or TV sets with digital video processing (100 Hz, progressive scan)

• Single SDRAM memory (8 MB, 16 MB or 32 MB)

• Highly compressed FLASH code is decompressed into SDRAM at boot-up for optimum performance

• MIPS16 supported: 40% code size reduced

 

 

Software environment

This system solution comes with a complete software development environment featuring a modular directory tree structure that allows customers to choose from drivers, drivers + adaptation layer or drivers + adaptation layer + application configurations. Based on a pSOS 2.5 operating system, this software environment offers two sets of debug tools (EJTAG), Wind River (Vision Probe or Vision Ice with optional Trace capability) and Ashling’s Opella plus Vitra programs for Trace capability.

 

A free-to-air application stack for DVB-C is included in the development package, allowing customers to tailor the look and feel to meet their own specific needs.

 

 

(编辑整理:张迎辉)