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CXA1917AM/AS PDF预览

CXA1917AM/AS

更新时间： 2024-01-22 20:21:17
品牌 Logo 应用领域
其他 - ETC /
页数 文件大小 规格书
17页 290K
描述
Dolby S type Noise Reduction Processor

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中文翻译

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CXA1917AM/AS 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Obsolete零件包装代码：DIP
包装说明：SDIP,针数：30
Reach Compliance Code：unknown风险等级：5.92
商用集成电路类型：DOLBY NOISE REDUCTION IC杜比水平规范：388 mV
杜比类型：S谐波失真：1%
JESD-30 代码：R-PDIP-T30JESD-609代码：e0
长度：26.9 mm信道数量：2
功能数量：1端子数量：30
最高工作温度：75 °C最低工作温度：-20 °C
封装主体材料：PLASTIC/EPOXY封装代码：SDIP
封装形状：RECTANGULAR封装形式：IN-LINE, SHRINK PITCH
峰值回流温度（摄氏度）：240认证状态：Not Qualified
最大供电电压 (Vsup)：6.5 V最小供电电压 (Vsup)：4.5 V
表面贴装：NO温度等级：COMMERCIAL EXTENDED
端子面层：TIN LEAD端子形式：THROUGH-HOLE
端子节距：1.778 mm端子位置：DUAL
处于峰值回流温度下的最长时间：10宽度：10.16 mm
Base Number Matches：1

CXA1917AM/AS 数据手册

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CXA1917AM/AS  
Notes on Application  
The CXA1917A is an encoding IC for the Dolby S type (NR). An external operational amplifier is required to  
configure the decoder circuit. The Dolby level voltage of this IC is designed to be –6dBm (388mVrms), which is  
the same as that of the CXA1562 and CXA1563 Dolby B-C type ICs. Therefore, it is possible to use the  
CXA1562 or the CXA1563 to configure a B-C-S type switchable processor. The B-C-S type switchable  
processor can be configured without requiring an external operational amplifier because the CXA1563 has a  
built-in S-type changeover switch.  
Power Supply  
The CXA1917A will operate with either dual or single power supply. Connect VCT pin to GND pin when dual  
power supply is used. Connect VEE pin to GND pin and open VCT pin when a single power supply is used. The  
power supply half the Vcc generated inside the IC is generated at VCT pin.  
The supply voltage range is from ±4.5V to ±6.5V and from 9V to 13V for dual and single power supplies,  
respectively. Note, however, that the minimum supply voltage is determined by the maximum voltage  
amplitude of external operational amplifier. Because general-purpose operational amplifiers have the  
maximum voltage amplitude of approximately (Vcc – VEE) –2V, actual minimum supply voltages, which satisfy  
the 15dB overload margin, are ±5.0V and 10V for dual and single power supplies, respectively. The supply  
current does not depend so much on the supply voltage, but does depend on the signal level and frequency.  
The maximum supply current in the worst case is approximately 25mA.  
Recording Processor  
Fig. 1 shows the recording processor. The gain is defined as follows:  
GREC20 · Log (1 + R62/R63) ...... (1)  
The processor in Fig. 1 has a gain of 14dB, therefore, input sensitivity is –20dBm (77.5mVrms). An input  
sensitivity higher than –25dBm (44mVrms) is generally unacceptable due to noise performance, although this  
is affected by the operational amplifier in the input circuit. An important characteristic for the external  
operational amplifier is the noise performance for approximately an input impedance of 20kΩ. A bipolar input  
type will be better than the JFET input type for the recording processor.  
Playback Processor  
Fig. 2 shows the playback processor. The gain is defined as follows:  
GPB20 · Log (1 + R64/R65) ...... (2)  
The processor in Fig. 2 has a gain of 20dB, therefore, the input sensitivity is –26dBm (39mVrms). Important  
characteristics of the playback processor are the frequency response and the feedback loop stability, which  
depend on the gain of the feedback loop gain and the slew rate of the external operational amplifier. The slew  
rate has to be higher than 3V/µs. The loop gain can be estimated using the gain bandwidth product BG (Hz) of  
the operational amplifier and the decode gain APB. The lower limit of BG/APB is approximately 500kHz, and  
the recommended range is from 1 to 3MHz.  
Switchable Processor  
Fig. 3 shows the switchable processor. The gains are the same as in equations (1) and (2). An operational  
amplifier is required with low noise, average slew rate (> 3V/µs), and wide bandwidth (≈ 10MHz) for this gain  
setting. A bipolar input type operational amplifier with a wide bandwidth like those of the 4560 and the 4570 is  
required of the switchable processor.  
The processor in Fig. 3 may generate a significant switching noise, especially when S2 switch is make-break-  
make type. When S2 switch is a make-to-make type or has a quick switching feature, the switching noise will  
be within the range acceptable for cassette decks with output muting circuits.  
– 12 –  
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