CXA1580Q 查看數據表（PDF） - Sony Semiconductor

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CXA1580Q

Dolby B Type Noise Reduction System with Playback Equalizer

Sony Semiconductor 

(1) Signal route

PBFB PBTC

Dolby level

(–30dBm)

PBOUT TAPEIN CDIN RADIOIN

(–6dBm)

LINEOUT

CXD1580Q

Op 1

Op 2

4dB

TAPE

AUX

20dB

20dB

PBIN

FR

Fig. 1

Op1 and Op2 are operational amplifiers.

Op1 compose the playback equalizer by attaching a resistor and a capacitor to PBFB pin, and a capacitor to

PBTC pin.

Op2 is an input selector and a LINEOUT amplifier. The gain of LINEOUT amplifier is 24 dB.

Reference input level for Dolby is -30 dBm.

The adjustment method of playback equalizer is described in the paragraph (3).

(2) Level diagram

0dBm

–5

–10

–15

–20

–25

–30

–35

–40

–45

–50

–55

–60

–65

–70

–75

P

P

T

C

B

B

A

D

I

O

P

I

N

U

E

N

T

I

N

VR adjustment

–30dBm

–30dBm

(400Hz 217nWb/m)

Dolby level

–30dBm

–70dBm (315Hz 160n/Wb/m)

R

L

A

I

D

N

I

E

O

O

I

U

N

T

–6dBm

Dolby level

–30dBm

—11—

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