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L3281AD1 Datasheet

  • L3281AD1

  • LOW VOLTAGE TELEPHONE SPEECH CIRCUITS

  • 10頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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上傳產(chǎn)品規(guī)格書

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L3281
DC CHARACTERISTIC
The fig.5 shows the equivalent simplified circuit of
the DC regulator that provides to give the oppor-
tune DC impedance Zdc.
equivalent.
The zener voltage will be:
錚?/div>
70K
錚?/div>
Vz
= 錚?/div>
+
1
錚?/div>
Vbe
錚?/div>
13.6K
錚?/div>
It is possible to supply 1mA to the electrete volt-
age if VL > (1mA + Iz)
鈰?/div>
Rz + Vz
鈰?/div>
錚?/div>
錚?/div>
Idc
Z4
VL
=
錚?/div>
錚?/div>
RB
錚?/div>
鈰?/div>
鈰?/div>
錚?/div>
錚?/div>
(RA +
RB)
錚?+
VD
+
VR1
錚?/div>
錚?/div>
Figure 6:
Low Voltage Speech Circuit.
錚?/div>
錚?/div>
RA
錚訛９
+
1
錚鳳： +
VD
+
VR1
VL
=
錚?
Idc Z4
)
錚?/div>
錚?/div>
RB
錚革；
錚?/div>
since RA = RB
VL
=
(
Idc Z4 2
)
+
VD
+
VR1
When IL 18 mA and considering neglectible the
VD + VR1 variation versus line current :
鈭?/div>
VL
ZDC
=
=
2 Z4
鈭?/div>
Idc
At IL = 6.5 mA no current flows through Z4 but
only in the rest of the circuit for internal biasing
(Io;Ia). The bias current Io is fixed by the resistor
R2. The line voltage in this case is :
鈰?/div>
鈰?/div>
鈰?鈰?/div>
鈰?/div>
Figure 7:
Zener Equivalent.
VL = Ia RA + VR1 = 1.6 V
The Fig.6 shows the DC characteristic (voltage
between pin 12 and pin 3 versus line current).
The device own an equivalent zener voltage at
pin 5 that can be used as supply voltage for elec-
tret microphone (see Block Diagram).
The value of the resistor R2 and the capacitor C2
should be chosen in order to not affect the AC
line inpedance. The Fig.7 shows the zener
Figure 5:
Equivalent Simplified Circuit
6/10

L3281AD1相關(guān)型號PDF文件下載

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