SAA7724H

General description

DSP radio system

The Digital Signal Processing (DSP) radio system (see Fig.1) consists of:

• Analog tuner (also called RF/IF)
• SAA7724H
• Audio power amplifier
• Microcontroller
• IF co-processor
• Audio co-processor.

The microcontroller interfaces to the RF/IF and SAA7724H via an I²C-bus. Analog tape and CD inputs are input from other parts of the radio. The IF co-processor and audio co-processor interfaces to the SAA7724H via an I²S-bus.

SAA7724H

The SAA7724H digitizes up to two IF signals and performs DSP to generate left front, right front, left rear, and right rear audio and RDS/RBDS data output. The SAA7724H also samples analog baseband tape, FM MPX, AUX inputs, analog and digital CD, performs signal processing on these sampled waveforms and multiplexes the proper signal to the output. A microcontroller interface allows the SAA7724H to be controlled and monitored.

The SAA7724H is composed of hardwired and programmable DSP circuitry, with programmable parameters, such as injection frequencies, filter coefficients and control parameters. Some functions or groups of functions are implemented with programmable sequence processors.

Features

• AM and FM digitize at IF
• AM and FM narrow-band/IF AGC
• AM and FM IF filtering
• AM and FM adjustable channel detection/variable IF
• IF filter for WX
• AM and FM demodulation
• AM and FM stereo decoding
• AM and FM stereo pilot detection
• FM pilot notch
• AM pilot filter
• FM stereo blend, high blend, high cut, soft muting and de-emphasis
• AM stereo blend, LP filter, high cut and soft muting
• AM and FM noise blanker
• AM and FM gain adjust and calibration (audio)
• FM multipath detection
• FM multipath correction
• Diversity switching
• Radio Data System (RDS) and Radio Broadcast Data System (RBDS) demodulation and decoding
• Tape head calibration, equalization, Dolby B and AMS (from analog tape input)
• CD gain adjust, calibration and compression (from analog or digital SPDIF/I2S-bus input)
• Parametric equalization
• Volume control
• Bass control
• Treble control
• Balance/fade control
• DC blocking filter
• Dual source select
• Dual playback
• Channel delays
• Analog summer for four channels (through inputs MONO1 and MONO2)
• Audio limiting.

Sample rates

The SAA7724H runs at a master clock of 43.2 MHz. Audio processing runs at a sample rate of
1 x f_s = 42.1875 kHz = 43.2 MHZ/1024

Products/packages

Type number	North American Type number	Ordering code (12NC)	Product status	Package	Packing	Marking	Chemical content	Leadfree conversion date
SAA7724H/N105		9352 715 01518	Samples available	SOT317-2 (QFP100)	Reel Dry Pack, SMD, 13"	Standard Marking	SAA7724H/N105	week 50, 2004
SAA7724H/N105		9352 715 01557	Samples available	SOT317-2 (QFP100)	Tray Dry Pack, Bakeable, Multiple	Standard Marking	SAA7724H/N105	week 50, 2004

Pricing/ordering/availability

Type number	Ordering code(12NC)	Indicative price/unit($)	Region	Distributor	In stock	Inventory date	Buy online	Samples
SAA7724H/N105	9352 715  01518							not available
SAA7724H/N105	9352 715  01557							not available

Print / Email

• Print this information
• Email this information

Disclaimer

The information published on product information pages of the www.nxp.com or www.semiconductors.com websites is an extract from product data sheets and is for information purposes only. For detailed information please check the most recent version of the relevant product data sheet as published on these websites. In the event of any conflict between product information pages and data sheets or deviations from information provided in the product data sheets on these product information pages, the information provided in the product data sheets shall prevail.

The product status of the product(s) described in the product data sheet may have changed since publication of the data sheet and therefore information in datasheets on product status may be outdated. The latest information on product status is published on the product information pages of the above-mentioned websites.

As from October 1st, 2006 Philips Semiconductors has a new trade name - NXP Semiconductors, which will be used in future data sheets together with new contact details. In data sheets where the previous Philips references remain, please use the new links as shown below.

http://www.philips.semiconductors.com use http://www.nxp.com

http://www.semiconductors.philips.com use http://www.nxp.com (Internet)

sales.addresses@www.semiconductors.philips.com use salesaddresses@nxp.com (e-mail)

The copyright notice at the bottom of each page (or elsewhere in the document, depending on the version)
- © Koninklijke Philips Electronics N.V. (year). All rights reserved -
is replaced with:
- © NXP B.V. (year). All rights reserved.-

If you have any questions related to the data sheet, please contact our nearest sales office via e-mail or phone (details via salesaddresses@nxp.com). Thank you for your cooperation and understanding.