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AS2533P Scheda tecnica(PDF) 5 Page - ams AG

Il numero della parte AS2533P
Spiegazioni elettronici  Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping
PDF  25 Pages
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Produttore elettronici  AMSCO [ams AG]
Homepage  http://www.ams.com
Logo AMSCO - ams AG

AS2533P Scheda tecnica(HTML) 5 Page - ams AG

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5
Rev. 7
July 1998
Data Sheet
AS2533...6
Power On Reset
The on chip power on reset circuit monitors the supply
voltage (V
DD)
during off-hook. When V
DD rises above
approx. 1.2V, a power on reset occurs which clears the
RAM.
DC Conditions
The normal operating range is from 13 mA to 100 mA.
Operating range with reduced performance is from 5 mA
to 13 mA (parallel operation). In the operating range all
functions are operational.
At line currents below 13 mA the AS253x provides an
additional slope below 4.5V in order to allow parallel
operation (see figure 13).
The dc characteristic (excluding diode bridge) is
determined by the voltage at LI and the resistor R1 at line
currents above 13 mA as follows:
VLS
= VLI + ILINE ⋅ R1
The voltage at LI is 4.5V in the normal operating range.
During pulse dialling the speech circuit and other part of
the device not operating is in a power down mode to
save current. The CS pin is pulled to V
SS in order to turn
the external shunt transistor on to keep a low voltage
drop at the LS pin during make periods.
AC Impedance
The ac impedance of the circuit is set by external
components. The impedance can be real or complex.
The ac impedance is determined as follows:
ZAC
= 33 • Z1
The dc value of Z1 should be 30
Ω to maintain correct dc
performance.
Return loss and side tone cancellation can be determined
independant of each other.
Speech Circuit
The speech circuit consists of a transmit and a receive
path with dual soft clipping, mute, line loss compensation
and sidetone cancellation.
Transmit
The gain of the transmit path is 37 dB for 600
Ω line
termination from M1/M2 to LS (see test circuit figure 10).
Keyboard Connections Continued
(Either VOL or +/– keys)
Figure 2c (AS2535)
P
P //M
M
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
0
0
**
#
#
R
R 1
1
R
R 2
2
R
R 3
3
L
L N
N R
R
V
V O
O L
L
+
+
–
–
M
M 1
1
M
M 2
2
M
M 3
3
M
M 4
4
M
M 5
5
M
M 6
6
M
M 7
7
M
M 8
8
M
M 9
9
M
M 1
1 0
0
M
M 1
1 1
1
C1
C2
C3
C4
R1
R2
R3
R4
M
M 1
1 2
2



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