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STA680Q Datasheet(PDF) 7 Page - STMicroelectronics |
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STA680Q Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 43 page STA680 System overview 7/43 2 System overview Figure 2 shows the partitioning of the HD Radio receiver system, composed by an AM/FM RF front-end, IF channel signal processor and the HD Radio decoder (STA680). Figure 2. STA680 block diagram (detailed) The analog IF signal from the tuner front-end is digitized by a high-resolution sigma-delta A/D converter. A digital down-converter block, embedded into the IF channel signal processor, transforms the IF into a complex base-band signal. Its Bandwidth and sample rate have been adapted by filtering and decimation to match the specification of the HD Radio system. The complex base-band signal feed the HD Radio decoder (STA680) where the HD Radio stream is demodulated and decoded. The STA680 receives a digital base-band signal from the IF channel signal processor and returns the recovered audio and data services. STA680 can be configured to work with digital IF base-band inputs based on standard front- ends. Front-ends must conform to HD Radio standards for filter bandwidth and linearity. The STA680 requires external serial Flash memory to boot but can also be configured to boot from a host controller on IIC or SPI interfaces. The FLASH memory Is issued for program code and configuration data storage. STA680 needs SDRAM for bulk data storage required during the IBOC signal processing. Core System I/O & Control Interface BBI 1 I2S AM/FM Baseband Tuner (i.e. STA3004) RF Tuner (i.e. TDA7528) BaseBand Interface Peripheral Bus AHB Bus Audio Interface Vectra LX Tensilica DSP HiFi Tensilica Core Viterbi DMA SPI Flash SPI SD/MMC GPIO Clock Gen. Unit System PLL Peripheral PLL LDO Crystal Oscillator Opt. Xtal 28.224 MHz STA680 AHB/APB Bridge Slave Connection Master Connection 1MB SERIAL FLASH (bootable) 8 Mbit (1Mx8) MMC,SD SDIO Cards (4/8bit) MMC,SD SDIO Cards (4/8bit) MAIN MICRO SDRAM Interface 8MB SDRAM 64 Mbit (4Mx16) OTP SPI/I2C Micro i/f Boundary Scan JTAG Tuner & Audio Interface BBI 2 |
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