TDA7529 データシートの表示（PDF） - STMicroelectronics

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TDA7529

RF front-end for AM/FM DSP car-radio with IF sampling

STMicroelectronics 

TDA7529

Tuning state machine

5.1.5

Mode 100: jump

Figure 11. Jump timing diagram

EVENTS

bus

STOP

event

regs

swap

TIME

transmission with subaddr. bit 7 = 1 wait T1ms

AFSAMPLE

wait for Tplllock

wait T0.5ms wait 50 us

AFHOLD

B.E. OPERATION

mute audio

hold

unmute audio

AC00048

This mode is used to jump to a different frequency and stay there, with reception at the end

of the sequence.

AFHOLD can be used to tell the back-end to mute/unmute the audio and keep normal

processing on hold.

AFSAMPLE can be used to tell the back-end when the quality signal processing can be

restarted, with a stable situation to start from.

5.2

Mode 100: check

Figure 12. Check timing diagram

EVENTS

bus

STOP

event

regs

swap

TIME

transmission with subaddr. bit 7 = 1 wait T1ms

AFSAMPLE

wait for Tplllock

AFHOLD

B.E. OPERATION

mute audio

hold

AC00049

This mode is used to jump to a different frequency and stay there, with audio muted.

AFHOLD can be used to tell the back-end to mute/unmute the audio and keep normal

processing on hold.

AFSAMPLE can be used to tell the back-end when to freeze the quality signal processing.

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