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M88HM1521  -  MPEG-2 Decoder SoC with QAM Demodulator

The M88HM1521 is an MPEG-2 decoder SoC with embedded QAM demodulator. The device integrates RISC CPU @ 330MHz, QAM demodulator, MPEG-2 A/V decoder, 2D graphic engine, 4 video DACs and dual-channel audio DACs, etc. in a compact package. It receives IF / Low IF signals from external tuner and delivers analog CVBS /YPbPr/S-Video/RGB video as well as analog dual-channel audio. The device also provides an SPDIF interface for digital audio output, and supports 5 display layer overlay and VBI data (Teletext/CC/WSS/VPS) encoding.

The M88HM1521 is featured with standby control modes and comprehensive peripherals. Packaged in a 128-pin LQFP, it really offers a low-power, high-integrated SD solution for digital cable TV applications.


32-bit RISC CPU @ 330MHz

16-bit wide SDR/DDR interface for 8MB ~ 64MB SDRAM/DDRAM

SPI interface for serial Flash in size of 2MB ~ 32MB

On-chip OTP

Dual channel central DMA controller

QAM Demodulator

Fully compliant with DVB-C and ITU J83 A/C
16/32/64/128/256-QAM demodulation
Symbol rate: 0.87MBaud ~ 9MBaud
IF and Low IF input, with dual AGC for RF and IF gain control

PTI and TS Demultiplexer

48 PID slots and up-to 48 section filters for one slot

Video Decoding

Fully compliant with MPEG-1 (ISO/IEC 11172-2) or MPEG-2 MP@ML (ISO/IEC 13818-2)
Maximum 15 Mbps input bit rate
Strong error resilience and correction

Video Post-Processing

256-level alpha blending of five display layers: background, still picture, active video, 2xOSD
2D graphic engine
Graphic enhancement: anti-flicker, anti-aliasing, anti-flutter
Auto aspect ratio switch (16:9, 4:3 and 14:9)
256-level luminance, saturation and contrast adjustment

Video Encoding and Output

3DAC and 4DAC solutions selectable, supporting concurrent output of one CVBS and one of component video (YPbPr, S-Video                      or RGB)
VBI data encoding: WSS, Teletext, Closed Captioning, VPS

Audio Decoding and Output

Fully compliant with MPEG-1 and MPEG-2 Layer I/II audio
Dual audio DACs for dual-channel audio output
SPDIF digital output
Programmable audio-video delay control
Mute control and 32-level audio volume

Peripherals: UART, SPI, ISO7816 compliant smart card interface, 2-wire bus master interfaces, IRDA port, PWM output, GPIOs

Low power consumption with embedded standby control module

On-chip PLL system: system clocks generated from an external 24MHz crystal

Green Package: 128-pin LQFP

Digital cable set-top boxes

Narrow-band dual-way SD set-top boxes with cable modem

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