STV8226 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

STV8226

Multistandard TV Audio Processor and Digital Sound Demodulator

STMicroelectronics 

Demodulator Block

STV82x6

Sound Carrier Frequency Offset Recovery: Both Mono and Stereo IF Carrier frequencies can be

adjusted independently (registers CAROFFSET1 and CAROFFSET2) within a large range (up to

120 kHz for standard mono FM deviations) while the AUTOSTD system remains active. The

frequency offset estimation is written in registers FM_DCL and FM_DCR (Mono Left / Channel 1

And Mono Right / Channel 2, respectively) and can be used to implement the Automatic Frequency

Control (AFC) via an external I²C control.

If required, the AUTOSTD system can be disabled (Manual mode) and the user can control all

registers including those only controlled by the AUTOSTD function when active. Manual mode is

selected in registers RESET or AUTO_SCKM.

2.1.3

Sound Preprocessing and Selection

The demodulated sound signal can be redirected to 4 different output audio channels:

1. Loudspeaker & Subwoofer,

2. Headphone,

3. SCART,

4. I²S Interface.

Each output channel can independently select the demodulator source, analog SCART or I²S inputs

using register CH_SEL.

Figure 8: Sound Preprocessing and Selection Block Diagram

PEAK_DET_CTRL(4Bh)

PEAK_DET_STATL(4Ch)

PEAK_DET_STATR(4Dh)

Peak

Detector

FM/AM

DC

(From Demodulator) Removal

FM

De-emphasis

FM

Prescaler

FM

Dematrix

FM_DCL(42h)

FM_DCR(43h)

PRE_FM(44h)

NICAM

(From Demodulator)

NICAM

De-emphasis

NICAM

Prescaler

NICAM

Dematrix

PRE_NICAM(45h)

AUDIO IN

SCART

Prescaler

(From Input Analog Audio Matrix)

PRE_AUX(46h)

I²S IN

I²S

Prescaler

PRE_AUX(46h)

LS IN

(To Loudspeaker Processing)

HP IN

(To Headphone Processing)

CH_MX(48h)

AUDIO OUT

(To Output Analog Audio Matrix)

CH_MX(48h)

CH_SEL(49h)

CH_LANG(4Ah)

I²S OUT

(To I²S Interface)

14/97

Share Link: