General Description

The SAA7131E combines a digital global standard low-IF demodulator for analog TV with a PCI audio and video decoder.

The IF demodulator is an alignment-free digital multistandard vision and sound low-IF signal PLL demodulator for positive and negative video modulation. It can be used worldwide for M/N, B/G/H, I, D/K and L/L’ standards. The IF demodulator is especially suited for the application with the TV Silicon Tuner TDA18271, TDA8275A or equivalent IC.

The PCI audio and video broadcast decoder is a highly integrated, low-cost and solid foundation for TV capture in the PC, for analog TV and digital video broadcast (DTV and DVB). The various multimedia data types are transported over the PCI-bus by bus master-write, to best exploit the streaming capabilities of a modern host based system; see Figure 1.

Key Features

Generic properties

• Package: LBGA256
• Power supply: 3.3 V/1.8 V
• Power consumption of typical application: 1.35 W
• Meets requirements of PC Design Guides 98/99 and 2001
• Is compliant with PCI Specification 2.2 and Advanced Configuration
• PCI-bus Power Management Interface Specification, rev. 1.1, compliant (supported states: D0, D1, D2 and D3-hot)
• Reference designs available

Digital global standard low-IF demodulator for analog TV

• Digital IF demodulation for all analog TV standards worldwide (M/N, B/G/H, D/K, I and L/L’ standards)
• Multistandard true synchronous demodulation with active carrier regeneration
• Gated IF AGC acting on black level by using H/V PLL
• Composite Video Blanking Sync (CVBS) gain levelling stage to provide nearly constant signal amplitude
• Precise AFC/lock detector
• 16 MHz reference frequency input (from low-IF tuner) or operating as crystal oscillator
• High selectivity video low-pass filter for all standards
• Sound performance comparable to or better than QSS single reference concepts
• Alignment free
• Nyquist filter in video baseband
• Switchable IF PLL and IF AGC loop bandwidth
• Accurate group delay equalization for all standards
• Mostly digital FIR filter implementation (NSC notches, video low-pass filters)
• No SAW filter needed
• Especially suited for the Silicon Tuner TDA18271
• Low application effort and external component count in combination with the TDA18271
• Very robust IF demodulator coping with adverse field conditions
• High pull-in range
• CVBS and SSIF (Second Sound IF)/audio output with simple post filter (capacitor only)
• Excellent FM sound
• Acceptable AM sound
• High FM deviation mode for China
• Low video into sound crosstalk
• Auto or forced mute for sound
• Auto or forced blank for video
• One 10-bit IF ADC on-chip
• Two 10-bit DACs on-chip for CVBS and SSIF/audio
• Internal PLL synthesizer which permits to use a low-cost crystal (typically 16 MHz)
• Easy programming for I²C-bus
• High flexibility through expert mode
• I²C-bus interface and I²C-bus switch
• Four I²C-bus addresses selectable through 2 external pins
• Three general purpose input/output pins
• Separate Standby mode.

TV video decoder and video scaling

• All standards TV decoder: NTSC, PAL and SECAM
• Five analog video inputs: CVBS and S-video
• Video digitizing by two 9-bit ADCs at 27 MHz
• Sampling according ITU-R BT.601 with 720 pixel/line
• Adaptive comb filter for NTSC and PAL, also operates for non-standard signals
• Automatic TV standard detection
• Three-level Macrovision copy protection detection according to Macrovision detect specification Rev.1
• Control of brightness, contrast, saturation and hue
• Versatile filter bandwidth selection
• Horizontal and vertical downscaling or zoom
• Adaptive anti-alias filtering
• Capture of raw VBI samples
• Two alternating settings for active video scaling, e.g. for independent capturing and preview definition
• Output in YUV or RGB
• Gamma compensation and black stretching.

TV sound decoder and TV audio I/O

• All standards TV sound decoder: BTSC, EIAJ, NICAM, FM A2 and AM
• dbx-TV noise reduction decoding for BTSC systems
• FM radio stereo decoding
• Input of analog SIF signal and 8-bit ADC at 24.576 MHz
• Automatic sound standard detection
• Automatic dematrixing (stereo and dual)
• Volume, balance, bass and treble control
• Automatic Volume Levelling (AVL)
• Incredible Mono and Incredible Stereo
• Audio sampling clock can be locked to video frame rate (no drift of audio stream against video stream)
• Four analog audio baseband inputs (two stereo pairs) and on-chip stereo ADCs
• Supported audio sampling rates: 32 kHz, 44.1 kHz and 48 kHz
• Input of external audio reference clock, e.g. 24.576 MHz
• Output of audio master clock (768 x fs, 512 x fs, 384 x fs or 256 x fs selectable).

PCI and DMA bus mastering

• PCI 2.2 compliant including full Advanced Configuration and Power Interface (ACPI)
• 3.3 V and 5 V compliant
• System vendor ID, etc. through I²C-bus EEPROM
• DMA bus master-write for video, audio, VBI and TS or PS
• Configurable PCI FIFOs, graceful overflow recovery
• Packed and planar video formats, overlay clipping
• Hardware support for virtual addressing by Memory Management Unit (MMU).

Peripheral interface

• I²C-bus master interface: 3.3 V and 5 V compatible, 100 kHz and 400 kHz mode
• The device can operate without the PCI-bus (using I²C-bus) for stand-alone applications, application note available
• Digital video output: ITU, VIP, VMI and ZV formats
• Two digital audio outputs: I²S-bus for up to 4 channels
• Analog stereo audio output
• Integrated analog audio pass-through
• Support for analog audio loopback cable to sound card
• TS input: serial or parallel
• MPEG elementary or program stream input, parallel
• General purpose I/O, e.g. for strapping and interrupt
• Propagate reset and ACPI state D3.

Datasheet

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