描述 Description

The TEF6635 and TEF6638 devices are radio and audio single-chip ICs. These ICs contain an AM/FM radio tuner, software defined radio signal processing, audio processing and input/output selection.

The TEF6638 is the premium version that provides the full feature set. The TEF6635 is the lite version including a basic feature set.

The AM/FM radio receiver includes the front ends, tuning synthesizer, channel filtering, FM multipath improvement, demodulation, FM stereo decoding, weak signal processing, noise blanking and Radio Data System(RDS) reception.A maximum amount of digital signal processing is used, taking full advantage of the CMOS IC technology.

The audio processing block receives audio signals from the internal AM/FM radio receiver, external digital radio or external analog or digital audio sources. The audio signal processing contains basic functionality as tone-volume control as well as advanced digital audio processing functionality as audio equalization, chimes etc. The output signals of the audio processing block are provided in digital format on the host l2S outputs and in analog format on the audio DAC outputs.

The TEF6638 supports the digital standards HD Radio and Digital Radio Mondiale(DRM) in combination with NXP terrestrial digital radio coprocessors such as SAF356x.

特性 Features

? All in one digital receiver including tuner, software defined radio and audio processing
? Easy to control with high-level user interface
? FM receiver with a tuning range from 65 MHz to 108 MHz covering OIRT, Japan, Europe and US bands
? AM receiver covering Long Wave (LW), Medium Wave (MW) and full Short Wave (SW) bands
? Fully integrated tuning system combining low phase noise and fast tuning times
? FM Low-Noise Amplifier (LNA) with Automatic Gain Control (AGC)
? FM mixer for frequency conversion to a low Intermediate Frequency (IF) complex signal
? AM front-end LNA and AGC matching active and passive antenna applications
? AM MW RF selectivity with integrated capacitor bank and automatic calibration
? AM mixer for frequency conversion to a low IF complex signal
? High dynamic range Sigma-Delta (SD) IF Analog-to-Digital Converter (ADC)
? Digital IF signal processing including decimation, shift to baseband, AGC control,In-phase/Quadrature-phase (I/Q) correction, Precision Adjacent Channel Suppression(PACS), FM multipath suppression and demodulation
? Baseband I2S output for support of HD Radio and DRM with external digital radio coprocessor (TEF6638)
? Signal quality detection, FM stereo decoding, noise blanking and weak signal processing
? Advanced RDS and Radio Broadcast Data System (RBDS) demodulation and decoding with versatile output configuration
? One (TEF6635) or two (TEF6638) stereo third-order sigma-delta audio Analog-to-Digital Converters (ADCs) with an anti-aliasing input filter
? Three analog audio inputs with flexible input configuration connected to the analog input selector and audio ADC
? One differential stereo input connected to the second audio ADC (TEF6638)
? Two (TEF6635) or three (TEF6638) asynchronous Inter IC Sound (I2S) inputs
? One analog Sony Philips Digital InterFace (SPDIF) format input
? One digital SPDIF input, mutually exclusive with one asynchronous I2S input
? One (TEF6635) or two (TEF6638) synchronous I2S inputs and outputs in master mode
? Audio sample rate converters
? Digital audio processing with tone and volume control functions
? Four audio Digital-to-Analog Converters (DACs)
? Single 3.3 V supply voltage
? Fast mode I2C-bus (400 kHz)
? Built-in 1.2 V regulator control circuit
? Qualified in accordance with AEC-Q100