參數(shù)資料
型號(hào)： CXA1550
廠(chǎng)商： Sony Corporation
英文描述： Quad Precision Operational Amplifiers 20-LCCC -55 to 125
中文描述： 杜比B型降噪系統(tǒng)
文件頁(yè)數(shù)： 9/16頁(yè)
文件大小： 232K
代理商： CXA1550
—9—
CXA1550P, CXA1551M/P, CXA1552M/P, CXA1553M/P
Notes on Applications
1) Power supply
The CXA1550 series is designed to operate on either single or split power supply. The ripple rejection
performance is excellent for either supply. VCT (Pin 4) is a reference voltage of the V
CC
/2 buffer amplifier.
With single power supply operation, internally generated V
CC
/2 voltage appears at the pin, and a bypass
capacitor has to be connected between the pin and ground. On split power supply operation, the VCT (Pin
4) pin has to be connected to ground, and V
EE
(negative power supply) is supplied to the GND (Pin 15) pin.
2) Double speed (
×
2)
The CXA1550 series provides double speed encode/decode modes, which offer high speed dubbing
function. On double speed mode, the frequency response shifts twice as the normal B type.
3) Operational mode control
The CXA1550 series provides fully electronic switching circuits. The functions are controlled by DC voltage
of the two control pins of REC/PB (Pin 12) and ON/OFF/
×
2 (Pin 5). The switching truth tables are shown in
Table 1.
Table 1.
Pin
Pin 12
Pin 5
Function
PB (Decode)
REC (Encode)
NR
×
2
NR OFF
NR ON
Single Supply
V
CC
≥
V
≥
2.5 V
0.5 V
≥
V
≥
0 V
V
CC
≥
V
≥
V
CC
–0.5 V
V
CC
–2.5
≥
V
≥
2.5 V
0.5 V
≥
V
≥
0 V
Split Supply
V
CC
≥
V
≥
V
EE
+2.5 V
V
EE
+0.5 V
≥
V
≥
V
EE
V
CC
≥
V
≥
V
CC
–0.5 V
V
CC
–2.5 V
≥
V
≥
V
EE
+2.5 V
V
EE
+0.5 V
≥
V
≥
V
EE
It is desirable to provide CR time constant circuits at the mode control pins with time constant from 100
msec to 1 sec, which will reduce switching clicks effectively.
4) 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 –10 dBm (245 mVrms),
and is measured at the recording output (REC OUT) in the NR off mode.
The reference levels of the recording input (REC IN), playback input (PB IN) and line output (LINE OUT)
are defined as the levels which provide the Dolby level at the recording output in the NR off mode.
The CXA1550 series has a common silicon die, and has different internal connection (AL pattern). 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)
Recording input level
Playback input level
Line output level
–10 dBm (245 mVrms)
–30 dBm (24.5 mVrms)
–30 dBm (24.5 mVrms)
0 dBm (775 mVrms)
–3 dBm (548 mVrms)
–6 dBm (388 mVrms)
–10 dBm (245 mVrms)
CXA1550
CXA1551
CXA1552
CXA1553
相關(guān)PDF資料
PDF描述
CXA1551 Quad Precision Operational Amplifiers 14-CDIP -55 to 125
CXA1552 Dolby B type Noise Reduction System
CXA1553 Dolby B type Noise Reduction System
CXA1561M Dolby B-C Type Noise Reduction System(杜比B-C型降噪系統(tǒng))
CXA1560S Dolby B-C Type Noise Reduction System(杜比B-C型降噪系統(tǒng))
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CXA1550P 制造商:SONY 制造商全稱(chēng):Sony Corporation 功能描述:Dolby B type Noise Reduction System
CXA1551 制造商:SONY 制造商全稱(chēng):Sony Corporation 功能描述:Dolby B type Noise Reduction System
CXA1551M 制造商:SONY 制造商全稱(chēng):Sony Corporation 功能描述:Dolby B type Noise Reduction System
CXA1551M/P 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Dolby B type Noise Reduction System
CXA1551P 制造商:SONY 制造商全稱(chēng):Sony Corporation 功能描述:Dolby B type Noise Reduction System
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