STA680 datasheet(7/43 Pages) STMICROELECTRONICS

7 / 43 page

STA680

System overview

7/43

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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