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參數(shù)資料
| 型號： | MC33215BE |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 0K |
| 描述： | IC SPEAKERPHONE CIRCUIT 42-SDIP |
| 標(biāo)準(zhǔn)包裝： | 13 |
| 功能： | 語音切換式揚聲電話 |
| 電路數(shù)： | 1 |
| 工作溫度： | -20°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 42-SDIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 42-PSDIP |
| 包裝： | 管件 |
MC33215
8
MOTOROLA ANALOG IC DEVICE DATA
DESCRIPTION OF THE CIRCUIT
Based on the typical application circuit as given in
Figure 18, the MC33215 will be described in three parts: line
driver and supplies, handset operation, and handsfree
operation. The data used refer to typical data of the
characteristics.
LINE DRIVER AND SUPPLIES
The line driver and supply part performs the ac and dc
telephone line termination and provides the necessary
supply points.
AC Set Impedance
The ac set impedance of the telephone as created by the
line driver and its external components can be approximated
with the equivalent circuit shown in Figure 2.
Figure 2. Equivalent of the AC impedance
Inductor
+ R
REG1
xC
REG
x
R
SLP
11
Slope
+
R
SLP
11
x
1
)
R
REG1
R
REG2
CVLN
10 n
CVDD
100
ZVDD
620
Zbal
RSLB
2.2 k
RREG
∞
RREG1
360 k
CREG
220 n
Slope
Inductor
With the component values of the typical application, the
inductor calculates as 1.6 H. Therefore, in the audio range of
300 Hz to 3400 Hz, the set impedance is mainly determined
by ZVDD. As a demonstration, the impedance matching or
Balance Return Loss BRL is shown in Figure 3.
100
40
BRL
(dB)
f, FREQUENCY (Hz)
Figure 3. Balance Return Loss
35
30
25
20
15
10
5.0
0
1000
10000
The influence of the frequency dependent parasitic
components is seen for the lower frequencies (Inductor) and
the higher frequencies (CVLN) by a decreasing BRL value.
DC Set Impedance
The line current flowing towards the MC33215 application
is partly consumed by the circuitry connected to VDD while
the rest flows into Pin VLN. At Pin VLN, the current is split up
into a small part for biasing the internal line drive transistor
and into a large part for supplying the speakerphone. The
ratio between these two currents is fixed to 1:10. The dc set
impedance or dc setting of the telephone as created by the
line driver and its external components can be approximated
with the equivalent of a zener voltage plus a series resistor
according to:
Vzener + 0.2 x 1 )
R
REG1
R
REG2
) 10 AxR
REG1
ILN
+ I
line
–I
VDD
R
slope +
R
SLP
11
x
1
)
R
REG1
R
REG2
With:
VLN
+ Vzener ) ILN x R
slope
If RREG2 is not mounted, the term between the brackets
becomes equal to 1.
With the values shown in the typical application and under
the assumption that IVDD = 1.0 mA, the above formulas can
be simplified to:
VLN
+ 3.8 V ) I
line
–1.0mA x20
^ 3.8 V ) I
line
x20
In the typical application this leads to a line voltage of 4.2 V
at 20 mA of line current with a slope of 20
. Adding a 1.5 V
voltage drop for the diode bridge and the interruptor, the dc
voltage at tip–ring will equal 5.7 V.
If the dc mask is to be adapted to a country specific
requirement, this can be done by adjusting the resistors
RREG1 and RREG2, as a result, the zener voltage and the
slope are varied. It is not advised to change the resistor RSLP
since this changes many parameters. The influence of RREG1
and RREG2 is shown in Figure 4.
Figure 4. Influence of RREG1 and RREG2
on the DC Mask
0
12
VLN
(V)
Iline (mA)
10
8.0
6.0
4.0
2.0
0
20
40
60
80
100
.
RREG1 = 470 k
RREG2 = 220 k
RREG1 = 365 k
RREG2 = 220 k
RREG1 = 470 k
RREG2 = Infinite
RREG1 = 365 k
RREG2 = Infinite
As can be seen in Figure 4, for low line currents below
10 mA, the given dc mask relations are no longer valid. This
is the result of an automatic decrease of the current drawn
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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| MC33218AP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC33232D | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC33232DG | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC33232DR2 | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC33232DR2G | 功能描述:功率因數(shù)校正 IC Critical Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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