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参数资料
| 型号： | TS34118CD |
| 厂商： | Taiwan Semiconductor Co., Ltd. |
| 英文描述： | Voice Switched Speakerphone Circuit |
| 中文描述： | 语音开关扬声器电路 |
| 文件页数： | 16/20页 |
| 文件大小： | 328K |
| 代理商： | TS34118CD |
TS34118
16-20
2004/09 rev. B
Design Equations
Figure 10. Basic Block Diagram For Design Purpos
This is the general equation defining the microphone voltage necessary to switch comparator C1 when a received
signal V
L
is present. The highest V
M
occurs when the receive attenuator is at maximum gain (+6.0dB). Using the typical
numbers for Equation 6 yields:
V
M
= 0.52V
L
(Equation 7)
To switch comparator C2, currents I2 and I4 need to be determined. With sound applied to the
microphone, a voltage V
M
is creased by the microphone, resulting in a current I2 into TLI1:
V
M
2
Since G
HA
is the differential gain of the hybrid amplifiers, it is divided by two to obtain the voltage V2 applied to R2.
Comparator C2 switches when I4=I2. I4 is defined by:
V
L
[
]
FO
HR
G
G
×
(Equation 9)
I2 =
R2
×
×
G
G
G
HA
TX
MA
(Equation 8)
I4 =
R4
Setting I4=I2, and combining the above equations results in:
V
L
= V
M
×
[
]
[
2
G
G
G
×
G
×
G
R2
R4
FO
HR
HA
TX
MA
×
×
×
(Equation 10)
This equation defines the line voltage at Tip/Ring necessary to switch comparator C2 in the presence of a microphone
voltage. The highest V
L
occurs when the circuit is in the transmit mode (G
TX
= +6.0dB). Using the typical numbers for
Equation 10 yields:
V
L
=840V
M
(or V
M
=0.0019 V
L
)
(Equation 11)
At idle, where the gain of the two attenuators is –20dB (0.1V/V), Equations 6 and 10 yield the same result:
V
M
=0.024V
L
(Equation 12)
Equations 7, 11 and 12 define the thresholds for switching, and are represented in the following graph:
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| TS34118CD28C4 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
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| TS34118CS28C8 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
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