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CXA1101M Arkusz danych(PDF) 11 Page - Sony Corporation

Numer części CXA1101M
Szczegółowy opis  DOLBY B TYPE NOISE REDUCTION SYSTEM
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Producent  SONY [Sony Corporation]
Strona internetowa  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA1101M Arkusz danych(HTML) 11 Page - Sony Corporation

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– 11 –
CXA1100/CXA1101/CXA1102/CXA1163
When the ripple or noise component of VEE supply is not negligible small, the CR filter shown in Fig. a-1 will
be usefull.
The operation voltage range are
CXA1100
11.5 to 16V (±5.75 to ±8V)
CXA1101
8.5 to 16V (±4.25 to ±8V)
CXA1102
6.5 to 16V (±3.25 to ±8V)
CXA1163
5.0 to 16V (±2.5 to ±8V)
Fig. a-1.
The devices will satisfy the signal handling of 12dB specified by Dolby Laboratories on above voltage range.
2) Operation mode control
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.
VH and VL are defined as
(a) Single ended supply operation
VCC
≥ VH ≥ 2.5V
0.5V
≥ VL ≥ 0V
(b) Split supply operation
VCC
≥ VH ≥ VEE + 2.5V
VEE + 0.5V
≥ VL ≥ VEE
Fig. a-2.
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.
3) Reference levels
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
Recording output level (= Dolby level)
–10dBm (245mVrms)
Recording input level
–30dBm (24.5mVrms)
Play back input level
–30dBm (24.5mVrms)
Line output level
CXA1100
0dBm (775mVrms)
CXA1101
–3dBm (548mVrms)
CXA1102
–6dBm (388mVrms)
CXA1163
–10dBm (245mVrms)
13
14
15
R1
43k
47
100 to 470µF
VEE
CXA1100
Series
REC/PB
Function
VH
PB (Decode)
VL
REC (Encode)
ON/OFF
Function
VH
NR off
VL
NR on


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