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MF DIGITAL Scribe EC Standalone Series Bedienungsanleitung Seite 6

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Seitenansicht 5
Data Sheet AS25 33-36 austriamicrosystems
Revision 8.10 Page 5 of 25
Keyboard Connections continued (either VOL or +/– keys)
Figure 4 Keyboard Conn ection AS2535
Power On Reset
The on chip power on reset circuit monitors the supply
v
oltage (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 12).
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 dialing 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
independent of each other.
Speech Circuit
The speech circuit consists of a transmit and a receive
p
ath with dual soft clipping, mute, line loss compensation
and sidetone cancellation.
P
P
P
/
/
/
M
M
M
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
M
M
M
9
9
9
M
M
M
1
1
1
0
0
0
M
M
M
1
1
1
1
1
1
M
M
M
1
1
1
2
2
2
M
M
M
5
5
5
M
M
M
6
6
6
M
M
M
7
7
7
M
M
M
8
8
8
M
M
M
1
1
1
M
M
M
2
2
2
M
M
M
3
3
3
M
M
M
4
4
4
8
8
8
9
9
9
0
0
0
*
*
*
#
#
#
R
R
R
1
1
1
R
R
R
2
2
2
R
R
R
3
3
3
L
L
L
N
N
N
R
R
R
V
V
V
O
O
O
L
L
L
+
+
+
−
−−
−
−
−−
−
−
−−
−
R1
R2
R3
R4
C1
C2
C3
C4
ams AG
Technical content still valid
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