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SAA7174
analog audio pass-through
analog stereo to loopback cable or headphones digital audio
two analog audio stereo pairs
ADC(2)
ANALOG AUDIO INTERFACE
32kHz, 44.1 kHz, 48 kHz
AUDIO FEATURE PROCESSING SOUND DECODER (NICAM, A2/Dual-FM) DAC (2) AUDIO MUX
(volume, balance)
TV sound (SIF)
ANALOG SIF/ AUDIO INTERFACE
ADC
I2 S
five analog video inputs: CVBS, S-Video
ANALOG VIDEO INTERFACE
ADC(2)
DECODER COMB FILTER
VIDEO SCALER
MATRIX & GAMMA VIDEO PORT FORMAT
CLOCK SYNC
digital video control data, config data from EEPROM
GPIO interrupt
PROGRAMMABLE I/O IRQ SELECTION/MAP
PROGRAMMING REGISTERS
I2C INTERFACE
I 2C
SAA7174 conceptual block diagram
Video output
Decoded, scaled video is output through a digital video output port in various YUV or RGB formats including packed and planar, gamma-compensated, or black-stretched.
Audio passthrough
To support legacy analog audio, the SAA7174 also provides linelevel input and pass-through of analog audio signals. After capture through two pairs of line-level stereo inputs (with source select), mono audio signals are directly routed through a loop-back cable to a sound card for further processing or output. No external components are required.
Stereo audio capture, decode, and output
The SAA7174 handles capture and on-chip decoding of the TV stereo audio formats used throughout Europe (NICAM and A2/ Dual-FM). After capture from the TV tuner through a SIF (Sound Intermediate Frequency) port,TV stereo audio is digitized and FM or AM demodulated.The audio standard is detected, the pilot tone is investigated (mono, stereo, dual), and the signal is decoded. Two 16-bit audio ADCs support capture of sound signals from nonstandard sources such as video cameras, VCRs, and AM (mono) or FM (stereo) radio through two stereo line-in inputs. A field-locked audio sampling clock supports a constant number of audio clocks per video field, guaranteeing synchronization of audio and video streams. The SAA7174 also performs on-chip volume and balance processing. Decoded digital audio is output through an I2S port. Alternatively, it can be reconverted to analog by on-chip stereo DACs and rerouted through a loop-back cable to a sound card.
VBI capture
The SAA7174 captures raw VBI samples that can be provided to software components for decoding.The VBI sampling rate can be adjusted by the data slicing software. Supported VBI formats include Closed Captioning,Teletext,WST, NABST, CGMS, and WSS.
Versatile external interface
The SAA7174's flexible design, reusable components, and versatile external interfaces lower BOM and cost and support advanced decoder configurations. Such flexibility is made possible, in part, through 28 general purpose I/O (GPIO) pins, initially dedicated to provide a digital video port and peripheral interrupt input. GPIO pins can be reassigned if dedicated functions are not needed in a specific product configuration. In addition, unassigned pins can be utilized for GPIO under direct software control.
SAA7174
Analog TV video and stereo decoder for computing and consumer applications in Europe
www.semiconductors.philips.com
Technical specifications
PHYSICAL Package Power Temperature AUDIO DECODE SUBSYSTEM (CONTINUED) Sample rates 32 kHz, 44.1 kHz, 48 kHz Clocks Selectable: 768*fs, 512*fs, 384*fs or 256*fs 24.576 MHz to external audio reference clock Locked to video frame rate ADCs Two (2) 16-bit baseband audio One (1) 8-bit SIF, 24.576 MHz Audio features Volume, balance I 2 C INTERFACE Modes Bus-master interface, multi-master capable Slave interface Power 3.3 V and 5 V signal-level compatible Includes peripheral reset and power-down control Rates 100 kHz, 400 kHz GENERAL PURPOSE I/O Total pins 28 Dedicated Digital video output Peripheral interrupts I2S port (for digital audio output)
Rectangular LQFP128; 128 pins supply 3.3 V consumption 1.35 W (typical application) 0 to 70 oC
ANALOG VIDEO SUBSYSTEM Video input Five (5) analog input ports supporting any combination of CVBS (NTSC, PAL, SECAM) or S-Video signals ADCs Two (2) 9-bit CMOS ADCs, 27-MHz oversampling Video output digital video port ITU-656, YUV-VMI (8 bit), VIP 1.1 or VIP 2.0 (8 or 16 bit), ZV (16 bit), ITU-601 (16 bit) Sample rate 720 pixels/line (ITU 601) XTAL reference 32.11 or 24.576 MHz, supports all video standards Comb filter NTSC/PAL adaptive 4-line Y-C separation for all sources including broadcast and VCR Scaling Downscaling: horizontal, vertical, and by field rate Scalable from 10 taps H (for ratios close to 1:1) to 74 taps (icon-sized video) VBI formats Closed Captioning, Teletext, NABST, CGMS, WST, and WSS Macrovision 3-level with active status interrupt; compliant with Macrovision Copy Protection Detect Specification, Revision 1.00 AUDIO DECODE SUBSYSTEM Audio in One (1) analog SIF port (from tuner) Two pairs (2) analog stereo baseband inputs Audio out analog One (1) stereo port (for loop-back to sound card or local headphones) digital One (1) I2S port (GPIO) Decode formats NICAM, A2/Dual-FM
Philips Semiconductors
Philips Semiconductors is a worldwide company with over 100 sales offices in more than 50 countries. For a complete up-to-date list of our sales offices please e-mail sales.addresses@www.semiconductors.philips.com. A complete list will be sent to you automatically.You can also visit our website http://www.semiconductors.philips.com/sales.
(c) Koninklijke Philips Electronics N.V. 2003 SCL 76
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Date of release: June 2003 document order number: 9397 750 11473 Published in USA

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