cxa1102m Sony Electronics, cxa1102m Datasheet - Page 11

• Manufacturer Part Number: cxa1102m
• Description: Dolby B Type Noise Reduction System
• Manufacturer: Sony Electronics

2) Operation mode control
3) Reference levels
When the ripple or noise component of V
be usefull.
The operation voltage range are
The devices will satisfy the signal handling of 12dB specified by Dolby Laboratories on above voltage range.
The CXA1100 series provide fully electronic switching circuits. The functions are controlled by DC voltages
of the two control pins of REC/PB (pin 12) and ON/OFF (pin 5). The switching truth tables are shown in Fig. a-2.
V
(a) Single ended supply operation
(b) Split supply operation
It is desirable to provide CR time constant circuits at the mode control pins with time constant from
100msec to 1sec, which will reduce switching clicks effectively.
Characteristics and specifications of the Dolby noise reduction processor are defined as the levels and
measured with reference to the Dolby level. This particular level in these devices is –10dBm (245mVrms),
and is measured at the recording output (REC OUT) in the NR off mode.
The reference levels of the recording input (REC IN), play back input (PB IN) and line output (LINE OUT)
are defined the levels which provide the Dolby level at the recording output in the NR off mode.
The CXA1100 series has a common silicon die, and has different internal connection. The series provides
four different line output levels for various applications. Other reference levels, recording input level,
playback input level and recording output level (= Dolby level) are identical in all devices.
The reference levels are as follows
H
and V
CXA1100
CXA1101
CXA1102
CXA1163
Recording output level (= Dolby level)
Recording input level
Play back input level
Line output level
L
V
0.5V
V
V
are defined as
CC
CC
EE
+ 0.5V
V
V
V
H
H
11.5 to 16V (±5.75 to ±8V)
L
8.5 to 16V (±4.25 to ±8V)
6.5 to 16V (±3.25 to ±8V)
5.0 to 16V (±2.5 to ±8V)
2.5V
V
0V
EE
V
L
+ 2.5V
V
EE
CXA1100
CXA1101
CXA1102
CXA1163
EE
supply is not negligible small, the CR filter shown in Fig. a-1 will
–10dBm (245mVrms)
–30dBm (24.5mVrms)
–30dBm (24.5mVrms)
–10dBm (245mVrms)
–3dBm (548mVrms)
–6dBm (388mVrms)
0dBm (775mVrms)
– 11 –
Function
Function
REC/PB
ON/OFF
V
EE
100 to 470µF
47
PB (Decode)
Fig. a-2.
Fig. a-1.
NR off
CXA1100/CXA1101/CXA1102/CXA1163
V
V
H
H
R1
43k
15
13
14
REC (Encode)
CXA1100
Series
NR on
V
V
L
L