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TEA7063 Arkusz danych(PDF) 10 Page - STMicroelectronics

Numer części TEA7063
Szczegółowy opis  SPEECH CIRCUIT WITH POWER MANAGEMENT
Download  15 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA7063 Arkusz danych(HTML) 10 Page - STMicroelectronics

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6. CURRENT SOURCE FOR SPEAKERPHONE
6.1 Current Source (pin 12)
Most of the DC current available from the line is
delivered by the speech circuit at the output Isource
(pin 12) through an internal current generator.
Typical values of this current, lLS with R9 = 100K,
are:
ILS = (0.3
• ILINE)
for ILINE < 16.5mA
ILS = (0.9
• ILINE -10mA) for ILINE > 16.5mA
(ex: ILINE = 16mA then ILS = 5mA
ILINE = 30mA then ILS = 17mA
ILINE = 60mA then ILS = 44mA).
The voltage level at pin 12 must be defined by an
external regulator (i.e.: zener) and, if necessary,
filtered with a capacitor (47 to 220
µF).
In case VLINE (at pin 16) approaches voltage at
pin 12, then the internal current source switches
off and its DC current is shunt to ground through
and internal
complementary generator, thus
avoiding any negative effect on the AC and DC
impedances of the telephone set application.
5. MICROPROCESSOR INTERFACE
5.1 Microprocessor Supply (pin 19)
At ”off-hook” the first priority of the circuit is to
make some current available at the Microproces-
sor Supply (pin 19) to charge quickly the external
capacitor C2.
This charging current is Icpm = 0.6
• ILINE
T-charge of about 10ms is necessary, with C2 =
47/
µF. to charge pin 19 at the specified value of
3.3V typical at ILINE = 25mA:
T-charge =
3.3V
• C2
0.6
• ILINE
typically
Vmp = 3.3V in normal operation and current in-
creases linearly from 0.5mA min, at ILINE = 6mA,
to1.5mA, at ILINE = 25mA, remaining stable for
higher values of ILINE. (with R9 = 100K)
In general:
Imp =
130Volt
R9
+ 0.3mA at IL > 25mA
Imp =
11Volt
R9
+ 0.3mA at IL > 6mA
A zener of 3.9V typical is generally suggested to
Figure 8
Figure 9
TEA7063
10/15


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