SAF7741 Просмотр технического описания (PDF) - NXP Semiconductors.

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SAF7741

Car radio Digital Signal Processor (DSP)

NXP Semiconductors. 

SAF7741HV

Dual IF car radio and audio DSP (N1F)

Rev. 05 — 09 May 2008

Objective data sheet

1. General description

The SAF7741HV is a combined Intermediate-Frequency (IF) car radio and audio Digital

Signal Processor (DSP) with several powerful cores integrated onto a single device. It

combines analog IF input, digital radio and audio processing, sample-rate converters and

digital and analog audio output to enhance listening clarity and noise suppression while

reducing multipath channel effect.

The SAF7741 offers user-specific functions which can be configured to match the

software platform required by the systems of individual car-radio manufacturers, thus

providing a high level of product differentiation. It is equipped to work with the TEF7000

and TEF6730 integrated tuners for analog and digital AM/FM decoding and sound

processing

The SAF7741HV consists of two main processing blocks; one for radio and the other for

audio. These blocks demodulate either the IF or the low-IF tuner output, delivering digital

audio to internal Digital-to-Analog Converters (DACs). In addition to the main blocks there

are a number of interfaces and dedicated sub-circuits.

1.1 Radio processing

The IF radio block interfaces to the front-end tuner chips and supports either a so-called

low-IF frequency (of 60 kHz or 300 kHz ) or an IF frequency of 10.7 MHz. Two tuner

interfaces are supported, each of which is suitable for analog Frequency-

Modulated/Amplitude-Modulated and Weatherband (FM/AM/WX) radio reception as well

as reception of encoded digital signals such as HD Radio and Digital Radio Mondiale

(DRM).

Signals received from the tuner front-end chips are digitized with integrated Intermediate-

Frequency Analog-to-Digital Converters (IFADCs). The resulting digital signals are then

down-sampled, error-corrected and filtered in the digital domain to be suitable for further

radio and audio processing by the DSPs.

The low-IF interface to the tuner chip combined with the high level of integration allows

cost-effective implementation of the entire tuner/DSP application on a main radio Printed

Circuit Board (PCB).

1.2 Audio processing

The audio processing block receives either external digital signals, or analog signals

which are then digitized by the integrated ADCs. Together with the internal radio audio

signals these inputs are available for further audio processing such as equalization, tone

control and volume control. The output signals of the audio processing block are provided

in digital format on the Host IIS outputs and in analog format on the DAC outputs.

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