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参数资料
| 型号： | MC33219ADW |
| 厂商： | MOTOROLA INC |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | VOICE SWITCHED SPEAKERPHONE CIRCUIT |
| 中文描述： | SPEAKER PHONE CIRCUIT, PDSO24 |
| 封装： | PLASTIC, SOIC-24 |
| 文件页数： | 21/28页 |
| 文件大小： | 562K |
| 代理商： | MC33219ADW |
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MC33219A
21
MOTOROLA ANALOG IC DEVICE DATA
experience has shown to be a “comfortable response” by
the circuit.
2) The distortion in the receive attenuator will increase as
the CT capacitor value is decreased. The extra THD will be
most noticeable at the lower frequencies and at the lower
ampitudes. Table 1 provides a guideline for this issue.
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15
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25 ms
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Input
20 mVrms
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300 Hz
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THD
1.2%
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0.25%
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100 mVrms
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300 Hz
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0.5%
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1.0 KHz
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0.2%
6.8
F
12 ms
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20 mVrms
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300 Hz
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5.0%
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1.0 KHz
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0.7%
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100 mVrms
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300 Hz
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1.3%
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1.0 KHz
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0.35%
3.0
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F
5.0 ms
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20 mVrms
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300 Hz
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11%
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1.0 KHz
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1.8%
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100 mVrms
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300 Hz
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2.6%
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1.0 KHz
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0.7 %
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Considerations in the Design of a Speakerphone
The design and adjustment of a speakerphone involves
human interface issues as well as proper signal levels.
Because of this fact, it is not practical to do all of the design
mathematically. Certain parts of the design must be done by
trial and error, most notably the switching response and the
“How does it sound” part of the testing. Among the
recommendations for a successful design are:
1) Design the enclosure
concurrently
with the
electronics. Do not leave the case design to the end as its
properties are just as important (just as
equally
important) as
the electronics. One of the major issues involved in a
speakerphone design is the acoustic coupling of the speaker
to the microphone, which must be minimized. This
parameter is dependent entirely on the design of the
enclosure, the mounting of the speaker and the microphone,
and their characteristics.
2) Ensure the speaker is optimally mounted. This fact
alone can make a difference of several dB in the sound level
from the speaker, as well as the sound quality. The speaker
manufacturer should be consulted for this information.
3) Do not breadboard the circuit with the microphone and
speaker hanging out in midair. It will not work. The speaker
and microphone must be in a suitable enclosure, preferably
one resembling the end product. If this is not feasible,
temporarily use some other properly designed enclosure,
such as one of the many speakerphones on the market.
4) Do not breadboard the circuit on a wirewrapped board
or a plug–in prototyping board. Use a PC board, preferably
with a ground plane. Proper filtering of the supply voltage at
the VCC pin is essential.
5) The speakerphone must be tested with the intended
hybrid and connected to a phone line or phone line simulator.
The performance of the hybrid is just as important as the
enclosure and the speakerphone IC.
6) When testing the speakerphone, be conscious of the
environment. If the speakerphone is in a room with large
windows and tile floors, it will sound different than if it is in a
carpeted room with drapes. Additionally, be conscious of the
background noise in a room.
7) When testing the speakerphone on a phone line, make
sure the person at the other end of the phone line is
not
in the
same room as the speakerphone.
Design Procedure
A recommended sequence follows in Figure 31,
assuming the end product enclosure is available, with the
intended production microphone and speaker installed, and
the PC boards or temporary substitutes installed.
Figure 31. Basic Block Diagram for Design Purposes
Acoustic
Coupling
Control
Hybrid
GST
(GAC)
V1
Tip
Ring
R1
V2
R2
Rx Attenuator
VM
MCI
Mike
Amp
Speaker
Amp
RAO
MCO
RAI
TAO
TAI
I1
I2
RXO
RXI
TLI
RLI
Tx Attenuator
Speaker
Microphone
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC33232D | 功能描述:功率因数校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| MC33232DG | 功能描述:功率因数校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| MC33232DR2 | 功能描述:功率因数校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| MC33232DR2G | 功能描述:功率因数校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| MC33232P | 功能描述:功率因数校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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