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PDF TDA7705TR Data sheet ( Hoja de datos )
| Número de pieza | TDA7705TR | |
| Descripción | Highly integrated tuner | |
| Fabricantes | STMicroelectronics | |
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TDA7705
Highly integrated tuner for AM/FM car radio
Features
■ Fully integrated VCO for world tuning
■ High performance PLL for fast RDS system
■ AM/FM mixers with high image rejection
■ Integrated AM-LNA and AM-PINDIODE
■ Automatic self alignment for preselection and
image rejection
■ Digital IF signal processing, high performance
and drift-free
■ Integrated IF-filters with high selectivity, high
dynamic range and adaptive bandwidth control
■ RDS demodulation with group and block
synchronization
■ High performance stereodecoder with
noiseblanker
■ I2C/SPI bus controlled
■ Single 5 V supply
■ LQFP64 package
Description
The TDA7705 highly integrated tuner (HIT) is a
new generation of high performance tuners for
carradio applications.
LQFP64
It contains mixers and IF amplifiers for AM and
FM, fully integrated VCO and PLL synthesizer,
IF-processing including adaptive bandwidth
control, stereo decoder and RDS decoder on a
single chip.
The utilization of digital signal processing results
in numerous advantages against today's tuners:
very low number of external components, very
small space occupation and easy application,
very high selectivity due to digital filters, high
flexibility by software control and automatic
alignment.
Table 1.
Device summary
Order code
TDA7705
TDA7705TR
Package
LQFP64 (10x10x1.4mm)
LQFP64 (10x10x1.4mm)
Packing
Tray
Tape and reel
September 2013
Doc ID 15938 Rev 9
1/42
www.st.com
1
1 page  
TDA7705
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
I2C "write" sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
I2C "read" sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SPI modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SPI "write" sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SPI "read" sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
I2C bus timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SPI bus timing diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FM input set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
AM MW input set up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
AM LW input set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
AM SW input set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
WX input set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
FM wide-band application / I2C control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Example of FM tuned (narrow-band) application / SPI control . . . . . . . . . . . . . . . . . . . . . . 39
LQFP64 (10x10x1.4mm) mechanical data and package dimensions. . . . . . . . . . . . . . . . . 40
Doc ID 15938 Rev 9
5/42
5 Page 
TDA7705
Function description
2.6 IF A/D converters
A high performance IQ-IFADC converts the IF-signal to digital IF for subsequent digital
signal processing.
2.7 Audio D/A converters
A stereo DAC provides the left / right audio signals after IF-processing and stereodecoding
by the DSP.
2.8 VCO
The VCO is fully integrated without any external tuning component. It covers all FM
frequency bands including EU, US , Japan, EastEU, Weatherband and AM-bands including
LW, MW, SW.
2.9 PLL
The high speed tuning PLL is able to settle within about 300 µs for fast RDS applications.
The frequency step can be as low as 5 kHz in FM and 500 Hz in AM.
2.10
Crystal oscillator
The device works with a 37.05 MHz fundamental tone crystal, and can be used also with a
3rd overtone 37.05 MHz crystal.
2.11
DSP
The DSP and its hardware accelerators perform all the digital signal processing. The main
program is fixed in ROM. Control parameters are copied in RAM and are accessible and
modifiable there, thus allowing parametric performance optimization.
It performs:
● digital down-conversion of IF
● bandwidth selection with variable controlled bandwidth
● FM and AM noiseblanking
● FM/AM demodulation with softmute, high-cut, weak signal processing and quality
detection
● FM stereo decoding with stereo blend
● RDS demodulation including error correction and block synchronization with generation
of an RDS interrupt for the main µP
● Autonomous control of RDS-AF tests
● Self alignment of preselection tuning
Doc ID 15938 Rev 9
11/42
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TDA7705TR.PDF ] | |
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