TDA7529 datasheet(30/60 Pages) STMICROELECTRONICS

tên linh kiện	TDA7529

Giải thích chi tiết về linh kiện	RF front-end for AM/FM DSP car-radio with IF sampling

PDF	60 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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30 / 60 page

Tuning state machine

TDA7529

30/60

5.1.3

Mode 010: search

Figure 9.

Search timing diagram

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

AFSAMPLE can be used to tell the back-end when to mute the audio output.

AFHOLD can be used to tell the back-end to switch to faster time constants for quick quality

acquisition.

5.1.4

Mode 011: AF update

Figure 10.

AF update timing diagram

This mode is used to jump to an AF frequency, check its quality, jump back to the starting

frequency and continue reception.

AFSAMPLE can be used to tell the back-end when to acquire the AF frequency quality.

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

processing on hold.

EVENTS

TIME

transmission with subaddr. bit 7 = 1

wait T1ms

wait for Tplllock

wait 50 us

AFSAMPLE

AFHOLD

B.E. OPERATION

mute audio

quality dets in fast mode

bus

STOP

event

regs

swap

AC00046

EVENTS

TIME

transmission with subaddr. bit 7 = 1

AFSAMPLE

AFHOLD

B.E. OPERATION

mute audio

hold

unmute audio

bus

STOP

event

regs

swap

regs

swap

freeze

AF qual

AC00047

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