STA680 datasheet(6/43 Pages) STMICROELECTRONICS

6 / 43 page

Description

STA680

6/43

Description

The STA680 from STMicroelectronics is a system on a chip designed for demodulating and

decoding of HD Radio(a) signals. The STA680 is compliant with the IBiquity specification and

extends the possibility to implement new and optional features and to manage additional

services.

The device combines it all into a single IC consisting of several hardware blocks and a

programmable core to guarantee the proper level of flexibility, low current consumption and

an optimized die size.

The STA680 implements the entire signal processing chain of an HD Radio receiver.

●

The digital channel demodulation and decoding, including OFDM demodulation and

error correction.

●

Source decoding, consisting of audio and data decoding of the digital channel.

●

The analog demodulator extracting the audio signal from the legacy analog AM/FM

signal (can be implemented as an optional feature)

●

The blending of the analog and digital audio signals

Figure 1 presents a functional diagram describing the data flow inside STA680 for HD Radio

demodulating and decoding.

The architecture consists of an effective and balanced hardware/software implementation,

to pursue the best combination in terms of current consumption, system flexibility and

device cost.

Functional blocks which are standard, and computation intensive, are implemented using

custom logic. Software implementation is more efficient for functional blocks where flexibility

is needed. Such flexibility enables the STA680 to be ready for future evolution, and allows

the implementation of specific and optional features.

Figure 1.

Functional data flow diagram

HD Radio™ technology manufactured under license from iBiquity Digital Corp. U.S. and Foreign Patents.

HD Radio™ and the HD Radio logo are proprietary trademarks of iBiquity Digital Corp.

AC00175

Main BB Interface

Secondary

BB Interface

Secondary

BB Interface

OFDM

Demod

PSK/QAM

Demod

Deinterleaver

and

Convolutional

Decoding

Channel Decoder

OFDM

Demod

PSK/QAM

Demod

Deinterleaver

and

Convolutional

Decoding

Channel Decoder

Digital

Analog

AM/FM

Demodulation

HDC

Decoder

Data

Processing

Source Decoder

Blending

Blended Audio

Audio Samples

DATA

I2S

SPI

I2C

BBI1

BBI2

I2S

* This features may be performed outside STA680 depending on the software configuration

Legacy AM/FM Samples

STA680

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