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STA680Q Datasheet(PDF) 7 Page - STMicroelectronics

Part # STA680Q
Description  HD Radio base-band receiver
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA680Q Datasheet(HTML) 7 Page - STMicroelectronics

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STA680
System overview
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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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