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TDA7512F Scheda tecnica(PDF) 2 Page - STMicroelectronics

Il numero della parte TDA7512F
Spiegazioni elettronici  FM car-radio tuner IC with intelligent selectivity system (ISS)
PDF  45 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7512F Scheda tecnica(HTML) 2 Page - STMicroelectronics

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Contents
TDA7512F
2/45
Doc ID 12668 Rev 2
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1
Mixer 1, AGC and 1.IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2
Mixer 2, limiter and demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3
Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.1
Fieldstrength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.2
Adjacent channel detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.3
Multipath detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.4
450 kHz IF narrow bandpass filter (ISS filter) . . . . . . . . . . . . . . . . . . . . 18
4.3.5
Deviation detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.6
ISS switch logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4
Soft Mute control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5
PLL and IF counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5.1
PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5.2
Frequency generation for phase comparison . . . . . . . . . . . . . . . . . . . . 19
4.5.3
Three state phase comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5.4
Charge pump current generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5.5
Inlock detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.6
Low noise CMOS op-amp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.7
IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.8
Sampling timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.9
Intermediate frequency main counter . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.10
Adjustment of the measurement sequence time . . . . . . . . . . . . . . . . . . 21
4.5.11
Adjust of the frequency value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6
I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6.1
Data transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21



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