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PDF AS2534BP Data sheet ( Hoja de datos )
| Número de pieza | AS2534BP | |
| Descripción | Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping | |
| Fabricantes | austriamicrosystems AG | |
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Data Sheet
AS2533...6
Multi-Standard CMOS Single Chip
® Telephone IC with Dual Soft Clipping
Austria Mikro Systeme International AG
General Description
Key Features
The AS253x is a CMOS integrated circuit that contains
u Line/speech circuit, LD/MF repertory dialler and
tone ringer on one 28 pin CMOS chip
all the functions needed to form a high performance
electronic telephone.
u Operating range from 13 to 100 mA (down to 5 mA
with reduced performance)
u Soft clipping to avoid harsh distortion
u Volume control of receive signal
The device incorporates LD/MF repertory dialling, melody
generation, ring frequency discrimination and a high
quality line/speech circuit.
u Line loss compensation selectable by pin option
u Low noise (max. - 72 dBmp)
u Real or complex impedance
u NET 4 compatible
u LD/MF switchable dialling
u Pacifier tone during programming
A RAM is on chip for a 31 digit last number redial and
memories (not AS2534) each containing up to 21 digits/
data. The sliding cursor procedure makes the LNR
function easy to use under various PABX systems. Also
centrex keys (not AS2535) are provided.
u 31 digit last number redial
u Repertory memories (not AS2534), 4 direct/10
indirect (AS2533/6), 12 direct (AS2535)
u Repeat dialling by busy or engaged (not AS2535)
The device incorporate a volume control for the earpiece.
The volume can be controlled by the VOL key (+ 5.4 dB)
or by the –/+ keys (+8.1 dB/-5.4 dB in 5 steps).
u Sliding cursor protocol with comparison
u Pause key for access pause or wait function
u 3 flash keys, 100 ms, 280 ms and 375/600 ms
u On chip MF filter (CEPT CS 203 compatible)
The versatility of the circuit is provided by pin options
and a few external components. This allows easy
adaptation to different PTT requirements.
u Ring frequency discrimination
u 3-tone melody generator
Package
Block Diagramme
Available in 28 pin SOIC or DIP.
La
Z2
ZBAL
Z1
Lb
CS
VDD
Vss
MO
FCI
LI CI
LS RI
STB
AGND
LED
LINE ADAPTATION
POWER EXTRACTION
DC MASK
VDD
LINE
CURRENT
SENSE
SOFT CLIP
AGC
MELODY
SEQUENCER
TONE
GENERATOR
RING
FREQUENCY
DISCRIMINATION
CONTROL
LOGIC
OSC
AS253x
RAM
MUTE
DIALLER
RO
M2
M1
R4
R3
R2
R1
HS/DP
LLC OSC
MFL
3.58
MHz
MODE C1 C2 C3 C4
AGND
LLC Hi
LLC Lo
LLC Off
KEY
PAD
Rev. 7
1 July 1998
1 page  
Data Sheet
AS2533...6
Keyboard Connections Continued
(Either VOL or +/– keys)
C1 C2 C3 C4
R1 P/M
1
2
3
R2 4 5 6 7
R3 8
R4 #
9
R1
LNR VOL
0
R2
+
*
R3
–
M1 M2 M3 M4
M5 M6 M7 M8
M9 M10 M11 M12
Figure 2c (AS2535)
Power On Reset
The on chip power on reset circuit monitors the supply
voltage (V ) during off-hook. When V rises above
DD DD
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 in order to turn
SS
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 • Z 1
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).
Rev. 7
5 July 1998
5 Page 
Data Sheet
Typical Application
Complex Impedance
(270 Ω + 750 Ω // 150 nF)
Figure 9
Only the components
necessary for
presenting the
complete functions of
the AS253X are
included.
The external components
might change to comply
with various national PTT
regulations and to interface
to different transducers.
Since the AS253x is a
component and not a complete
system, it can not be approved
as a stand alone part by the
standard bodies. Hence, full
conformance to any standards
is depending on the application
in which the AS253x is being
used, and therefore, approvals
by the standard bodies are the
responsibility of the customer
and Austria Mikro Systeme will
not have tested the product to
meet specific standards.
For further application
information please refer to
application note AN2201.
AS2533...6
Rev. 7
11 July 1998
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AS2534BP.PDF ] | |
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