TDA7529 Datasheet, PDF (31/60 Pages) STMicroelectronics – RF front-end for AM/FM DSP car-radio with IF sampling

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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