cxa1910q Sony Electronics, cxa1910q Datasheet - Page 12

• Manufacturer Part Number: cxa1910q
• Description: Dolby B Type Noise Reduction System With Playback Equalizer
• Manufacturer: Sony Electronics

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
P
B
O
U
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
–
NR
6dBm
N
E
O
U
L
T
I
CXA1910Q