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Preliminary Data Sheet
AS2507
(R)
Austria Mikro Systeme International AG
Single Chip 2-Wire Intercom CMOS Integrated Circuit
General Description
The AS2507 is a CMOS integrated circuit that contains all the functions needed to build a 2wire intercom network. The device incorporates 2/4-wire conversion (hybrid), soft clipping for high speech quality, FSK modem and a simple interface to a microcontroller. The signalling mode is selectable between FSK modulation and burst mode. The low standby current (typ. 2 mA) allows several devices to listen to the 2-wire line. The speech circuit is designed for compatibility with commonly used handset (150 earpiece and electret microphone) with receive gain of -6 dB and transmit gain of 32 dB (relative to line).
Key Features
Line/speech circuit and signalling on one 14
pin CMOS chip Only 2 wires needed for power supply, signalling and speech Soft clipping to avoid harsh distortion Fully integrated 2/4 wire conversion Side tone cancellation Low noise Signalling with FSK modem Low standby power consumption allows parallel operation of up to 25 terminals on a bus pair with central supply Parallel operation of up to 70 terminals if supplied locally Controllable via simple C interface Very few external components
Application
Entrance telephone system, intercom and data transmission, alarm systems, toy phone
Package
Available in 14 pin DIP and 16 pin SOIC
Block Diagram
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July 1998
Preliminary Data Sheet
AS2507
Pin description
Pin # DIP 14 7 6 2 4 Pin # SO 16 7 6 2 4 Symbol Function
M1 M2 RI RO
Microphone Input 1
Differential input for the microphone (electret)
Microphone Input 2
Differential input for the microphone (electret)
Receive Input
Input for ac-separated receive signal
Receive Output to Handset
Output for driving a dynamic earpiece with an impedance from 150 to 300
14 9 8 11 12 5
15 16 9 10 8 12 13 5
VDD VSS AGND OSC1 OSC2 PD
Voltage Drain Drain
Positive Power Supply
Voltage Source Source
Negative Power Supply
Analogue Ground
Signal ground for the internal amplifiers
Oscillator Output 1
Output to ceramic resonator 3.58MHz.
Oscillator Input 2
Input for ceramic resonator 3.58MHz.
Power Down Input Active high, i.e. a high level on this pin will power down the analogue signal path. Receive Data Output Output of the FSK demodulator Transmit Data Input
Input for the FSK modulator
10 13 1
11 14 1
RxD TxD TE
Transmit Enable
Input for enabling transmit data
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July 1998
Preliminary Data Sheet
AS2507
Functional Description
The AS2507 is a CMOS integrated circuit that incorporates a speech circuit and a FSK modem. It is intended to be used as linepowered interface on a 2-wire intercom bus.
FSK Modulator Two signalling modes are provided, namely FSK and burst mode. The signalling mode and the signalling can be controlled by a microcontroller using the TE and TXD inputs as follows: TE 0 0 1 1 TXD 0 1 0 1 MODE IDLE, no transmission TEST, for testing only SPACE ("0") 18.645 kHz MARK ("1") 22.375 kHz
Standby Condition During standby operation (PD=High) only the FSK demodulator is active to provide the companion microcontroller with all signalling information on the 2-wire bus. The low power consumption (typical 2mA) and a high input and output impedance in standby mode allow the parallel operation of many terminals on each bus pair. 2/4-Wire Conversion The AS2507 has a built-in side tone cancellation circuit. The transmit signal is attenuated by 6 dB over the 600 resistor (ac impedance) and subtracted from the receive signal at the receive input (RI). This configuration allows the selection of the required ac impedance and yet maintaining a good side tone cancellation. AC Impedance The ac impedance is determined by an external resistor at the TO output (typical 600). Transmit Path The gain of the transmit path from the microphone inputs (M1/M2) to the transmit output (TO) is set to 32 dB. The soft clip level is set to 0.5VPEAK at TO. In standby the output impedance is 60k. Receive Path The gain of the receive path from the receive input (RI) to the receive output (RO) is set to -6dB. The receive input is internally biased to AGND with a 500k resistor.
FSK Demodulator Also the demodulator provides two modes for detection as follows: Signal on line IDLE, no transmission SPACE ("0") 18.645 kHz MARK ("1") 22.375 kHz RXD 1 0 1
The demodulator consists out of a bandpass filter to attenuate interfering speech signals and a period counter. The RxD output is updated after each valid period or a counter overflow. Transmission Protocol In order to assure a safe data transmission, data framing is recommended. Each frame should consist out of a preamble (e.g. FFhex), a header (e.g. AAhex), data bytes and checksum. Independence of bus polarity Centrally supplied terminals can be connected to the 2-wire bus independent from polarity. In this case a rectifier bridge, known from telephony, is recommended since the DCsupply current will bias the diodes.
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July 1998
Preliminary Data Sheet
AS2507
Typical 2-Wire Intercom Application
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July 1998
Preliminary Data Sheet
AS2507
Electrical characteristics
Electrical charateristics are measured with the Test Circuit application. Typical mean values will not be tested.
Absolute maximum ratings Positive Supply Voltage Input Current Analogue Input Voltage Digital Input Voltage Electrostatic Discharge (HBM 1.5k-100pF) Storage Temperature -0.3V <= VDD <= 7V 25mA -0.3V <= Vin <= VDD+0.3V -0.3V <= Vin <= VDD+0.3V 1000V -65C to +125C
Recommended operating conditions Supply Voltage (VDD) Oscillator Frequency Operating Temperature 5V 10% 3.58 MHz -10C to +60C
DC characteristics VDD=5V, f=1kHz, unless other specified Symbol Parameter IDDS IDDO VIL VIH Supply Current Supply Current Digital Input Voltage LOW Digital Input Voltage HIGH Conditions Standby Mode PD=High, VDD=2.5V Operating Mode PD=Low, VDD=2.5V VSS 0.9 VDD Min Typ 2 5 Max 3 6 0.1 VDD VDD Units mA mA V V
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July 1998
Preliminary Data Sheet
AS2507
Transmit characteristics VDD=5V, f=1kHz, unless other specified Symbol Parameter ATX THD VNO VAGC1 Zout-TO Transmit Gain M1/M2 --> TO Distortion Noise Output Voltage TO Soft Clip Level M1/M2 --> TO at TO Output Impedance with PD=High at TO PD=High TAMP=25C 60 Conditions VTO=0.25VRMS VTO=0.25VRMS TAMP=25C 0.5 Min +30.0 Typ +32.0 Max +34.0 2 -60 Units dB % dBmp VP k
Receive characteristics VDD=5V, f=1kHz, unless other specified Symbol Parameter ARX THD VNO ST ZIn-RI Receive Gain RI --> RO Distortion Noise Output Voltage RO Sidetone Input Impedance RI Conditions VRI=0.25VRMS VRI=0.25VRMS TAMP=25C VRI=0.25VRMS 24 500 Min -8.0 Typ -6.0 Max -4.0 2 -60 Units dB % dBmp dB k
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July 1998
Preliminary Data Sheet
AS2507
FSK characteristics VDD=5V, f=1kHz, unless other specified Symbol Parameter fMARK MARK Frequency Conditions TE=High TxD=High fOSC=3.579545MHz TE=High TxD=Low fOSC=3.579545MHz TE=Low TE=Low TE=Low TE=High 600 35 Min Typ 22375 Max Units Hz
fSPACE
SPACE Frequency
18645
Hz
fMARK
Valid input frequency range MARK
22375 447 18645 372 100
Hz Hz mVp mVp dB
fSPACE Valid input frequency range SPACE VRImin VTO AVB Minimum Receive Input Voltage Detection Level Tone Output Level Attenuation at 4kHz Input Bandpass Filter
Test circuit
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July 1998
Preliminary Data Sheet
AS2507
Packaging
The device is available in the packages outlined below (not to scale). For exact mechanical package dimensions please see AMSAG packaging information.
14-pin plastic DIP (suffix P)
16-pin plastic SOICw (suffix T)
Max. Body Length Max. Body Width Pitch Max. Body Length Max. Body Width Pitch 20.19mm / 795mil 7.11mm / 280mil 2.54mm / 100mil
10.5mm / 414mil 7.6mm / 300mil 1.27mm / 50mil
Pin-out
DIP14 (suffix P) SO16w (suffix T)
1 2 3 4 5 6 7
- - - - - - -
TE RI TO RO PD M1 M2
VDD TxD OSC2 OSC1 RxD VSS AGND
- - - - - - -
14 13 12 11 10 9 8
1 2 3 4 5 6 7 8
- - - - - - - -
TE RI TO RO PD M1 M2 AGND
VDD VDD TxD OSC2 OSC1 RxD VSS VSS
- - - - - - - -
16 15 14 13 12 11 10 9
Marking
YYWWAAA AS2507 Austria
YY WW AAA
year of production calendar week of production AMSAG assembly ID
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July 1998
Preliminary Data Sheet
AS2507
Ordering information
Number AS2507 P AS2507 T Package DIP14 SO16w Description
plastic dual inline package - 14 leads (suffix P) plastic small outline package - 16 leads (suffix T)
Devices sold by Austria Mikro Systeme Int. AG are covered by the warranty and patent idemnification provisions appearing in its Term of Sale. Austria Mikro Systeme Int. AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the decribed devices from patent infringement. Austria Mikro Systeme Int. AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Austria Mikro Systeme Int. AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equiment are specifically not recommended without additional processing by Austria Mikro Systeme Int. AG for each application. Copyright (c) 1997-98, Austria Mikro Systeme International Int. AG, Schloss Premstaetten, 8141 Unterpremstaetten, AustriaEurope. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished here by Austria Mikro Systeme Int. AG is believed to be correct and accurate. However, Austria Mikro Systeme Int. AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damag es, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Austria Mikro Systeme Int. AG rendering of technical or other services.
Headquarters
Austria Mikro Systeme International Int. AG Schlo Premstatten 8141 Unterpremstatten, Austria-Europe Tel: +43 (0)3136 500-0 Fax: +43 (0)3136 52501, 53650 email: info@vertical-global.com http://www.vertical-global.com
France
124 Avenue de Paris F-94300 Vincennes Tel:+33 (0)1 4374 0090 Fax: +33 (0)1 4374 2098
Germany (south)
Stefan-George-Ring 19 D-81929 Munchen Tel: +49 (0)89 993 558-0 Fax: +49 (0)89 993 558-66
Germany (nord)
Am Seestern 8 D-40547 Dusseldorf Tel: +49 (0)211 536 02-0 Fax: +49 (0)211 536 02-50
Hong Kong
21/F., 1 Des Voeux Road West Sheung Wan, Hong Kong Tel: +852 2524 2738 Fax: +852 2868 4155
Italy
Piazzale Lugano 9 I-20158 Milano Tel: +39 (0)2 3932 1022 Fax: +39 (0)2 3932 3087
Spain
Parc Tecnologic del Valles E-08290 Cerdanyola/Barcelona Tel: +34 (0)93 582 4470 Fax: +34 (0)93 582 4471
Sweden (Scandinavia)
Sjoangsvagen 7 S-19272 Sollentuna Stockholm Tel: +46 (0)8 7549 395 Fax: +46 (0)8 7544 544
United Kingdom
Coliseum Business Centre Watchmoor Park Camberley, Surrey England GU15 3YL Tel: +44 (0)1276 233 99 Fax: +44 (0)1276 293 53
USA
Suite 460 20863 Stevens Creek Blvd. Cupertino, CA 95014 Tel: +1 408 865 1217 Fax: +1 408 865 1219
Austria Mikro Systeme Int. AG is represented by distributors in the following countries. Please contact your nearest regional sales office for the distributor's address: China, India, Japan, Korea, Singapore, Taiwan
Application support
Please contact your local sales office or your distributor
9/9
July 1998

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