CXA1910 SONY [Sony Corporation], CXA1910 Datasheet - Page 12

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CXA1910

Manufacturer Part Number
CXA1910
Description
Dolby B Type Noise Reduction System with Playback Equalizer
Manufacturer
SONY [Sony Corporation]
Datasheet
Description of Operation
(1) Signal route
(2) Level diagram
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 24dB.
Reference input level for Dolby is –30dBm.
The adjustment method of playback equalizer is described in the paragraph (3).
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–5
0dBm
F
PBIN
PBFB PBTC
R
VR adjustment
70dBm (315Hz 160n/Wb/m)
P
B
N
I
Op1
PBOUT
30dBm
O
U
P
B
T
NR ON
(–30dBm)
TAPEIN
—12—
Fig. 1
Fig. 2
30dBm
NR OFF
A
P
E
N
T
I
Op2
Dolby level
LINEOUT
(–6dBm)
20dB
20dB
4dB
Dolby level
6dBm
NR
O
U
N
E
T
L
I
CXA1910Q

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