TDA7420 データシートの表示（PDF） - STMicroelectronics

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TDA7420

MULTIFUNCTION AUDIO PROCESSOR

STMicroelectronics 

Figure 1: Block Diagram of the Noise Blanker

TDA7420

MPX IN

VR

VSB

80KHz LP

1

I2C-BUS

SIGNAL PATH

LEFT

RIGHT

to INPUT SELECTOR

of AUDIOPROC.

AMP

BUF

RECT

AUTOMATIC

PEAK

THRESHOLD

CONTROL

BLANK COMP

PEAK COMP

REF.

+

-

ATC PEAK+VTH

40µs

CMOS OUTPUT

STAGE

TRIGGER

OUT

40µs

5

RECT-PEAK

4

ADDITIONAL THRESHOLD

CONTROL

(ATC-SB, MPX_RECT)

D94AU189A

RPEAK

82KΩ

CPEAK

47nF

CBLANK

330pF

Figure 2: Trigger Threshold vs. Vpeak

VTH

8 STEPS

TRIG. THRESHOLD

65mV

30mV

0.9V

D94AU186B

280mV

240mV

180mV

140mV

NOISE ADJUSTED

TRIG. THRESHOLD

1.4V

VPEAK(V)

11/29

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