AS2524 austriamicrosystems, AS2524 Datasheet
![no-image](/images/manufacturer_photos/0/0/84/austriamicrosystems_sml.jpg)
AS2524
Specifications of AS2524
Available stocks
Related parts for AS2524
AS2524 Summary of contents
Page 1
... Telephone Line Interface and Speakerphone Circuit AS2523, AS2524, AS2524B Key Features Line/Speakerphone circuit on a 28-pin CMOS-IC, simple - inventory: same die for AS2523/24 and AS2523/24B Serial I/F on AS2523, parallel I/F on AS2524 - Enhanced voice switching - Background noise monitoring - Tx- and Rx-gain programmable on AS2523 only ...
Page 2
... Data Sheet AS2523, AS2524, AS2524B Pin description Pin # Symbol ine Current ense Input Analog input for sensing the line current ine nput Analog input used for power extraction and line current sensing eceive nput Analog input for ac-separated receive signal 9 STB ...
Page 3
... Symbol 25 xCS C S hip elect on AS2523 Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm ) /xMUTE Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B ata nput on AS2523 Data input of the serial interface. Internal pull-up resistor ( 100kOhm ) /xPD ...
Page 4
... Data Sheet AS2523, AS2524, AS2524B Detailed Block Diagram Revision 1.13 austriamicrosystems Page ...
Page 5
... The gain of the M1/M2 → set to +37dB. This gain can be changed by programming on AS2523 from +30dB to +45dB in 1dB steps (Register Txgain), on AS2524 / 24B it is set to +37dB per default. The input is differential with an impedance of 10kΩ. The soft clip circuit limits the output voltage There is LLC for this path ...
Page 6
... Data Sheet AS2523, AS2524, AS2524B LINE +14dB +8dB ~ +17dB Compress +3dB TXO TXV RO Compress RECV RECI Speech Mode Rx > Tx_atten X Receive Tx_atten > Idle Tx_atten > Rx YES Transmit RX-mode Vol max Vol default Revision 1.13 Gmax = +9dB Gmin = -21dB … -40dB (Vol) ...
Page 7
... Data Sheet AS2523, AS2524, AS2524B Typical Characteristics of Line Loss Compensation (AS2523, AS2524B only) The line-loss-compensation is programmable at the AS2523, not activated at the AS2524 and LLC high (45mA-75mA) activated at the AS2524B. (dB) Tx Gain 800 600Ω LINE -10 dBm Figure 1 Typical Tx Gain Characteristics Line Loss Compensation ...
Page 8
... Data Sheet AS2523, AS2524, AS2524B Serial Interface on AS2523 Registers The settings of the AS2523 are stored in 16 registers. Each register has 4 bit data width. Timing The data format for writing to a register has the following form: xCS CLK Note: The pins xCS,CLK,DI have internal pull-up resistors. ...
Page 9
... Data Sheet AS2523, AS2524, AS2524B Serial interface Registers The following table shows the content of the 16 control registers. Address Data Control registers AS2523 Nop Conf-Tone: LIV: Voltage at pin LI LLC1 LLC0: Line loss compensation setting 0 0 20mA-50mA Line loss compensation 1 0 45-75mA Line loss compensation ...
Page 10
... Data Sheet AS2523, AS2524, AS2524B Programming Guidelines for the AS2523 The AS2523 is programmed by means of a serial 8-bit shift register. MSB is clocked in first, LSB last. The first four bits (7,6,5,4) are the addresses of the registers, the last four bits (3,2,1,0) are the data bits. ...
Page 11
... Data Sheet AS2523, AS2524, AS2524B Parallel Interface on AS2524 and AS2524B Input Signal on Pin XPD xMute Power down Power down Power down Power down Tone mode Tone mode Handset mode Handsfree mode Power down mode For low power consumption the analog part is turned off during activated power down mode. The Power down mode is used during Flash and Pulse dialing and for On-hook operation ...
Page 12
... No LLC Tone TX-Gain +14dB Confidence tone -36dB@Ro –15dB@Lo level relative to Pin LS Loudhearing AS2524 and AS2524B (feature only available as DIE) Speech mode is Loudhearing (M3-M4, RO active; LO activated). Loudhearing can be activated via a bond-option (see document “AS2523/24 Delivery as Dice”). Parameter LI Voltage LLC TX-Gain RX-Gain ...
Page 13
... Data Sheet AS2523, AS2524, AS2524B DC characteristics I =15mA w/o operation of any additional external Line circuitry, unless other specified Symbol Parameter I Operating Current Speech Mode DDS I Operating Current Handsfree Mode DDH V Line Voltage LIVolt=0 15mA<=ILINE<=100mA LI Line Voltage LIVolt=1 I Output Current, Sink ...
Page 14
... Data Sheet AS2523, AS2524, AS2524B Symbol Parameter Z Input Impedance IN-M1/2 M1/M2 Z Input Impedance IN-M3/4 M3/M4 V Input Voltage Range INmax M1/2 - M3/4 V Noise Output Voltage Mute Attenuation MUTE Receive characteristics I =15mA f=800Hz, default settings unless other specified Line Symbol Parameter A Receive Gain ...
Page 15
... Data Sheet AS2523, AS2524, AS2524B Symbol Parameter V Noise Output Voltage Gain = 7.5dB Z Input Imp. RI IN-RI Input Voltage Range RI V INmax Z Input Imp. STB IN-STB Input Volt. Range STB V INmax ST Side tone V RL Return Loss Z Temp. Variation Z Δ AC/°C Test circuit D1 10V ...
Page 16
... Data Sheet AS2523, AS2524, AS2524B Typical application AS2523 Revision 1.13 austriamicrosystems Page ...
Page 17
... Data Sheet AS2523, AS2524, AS2524B Typical application AS2524 and AS2524B Revision 1.13 austriamicrosystems Page ...
Page 18
... Data Sheet AS2523, AS2524, AS2524B Packaging 28-pin plastic SOIC For exact mechanical package dimensions please see austriamicrosystems Pin-out, Marking CBN 1 28 TONE CLK / HFI TXO xPD TXV 4 25 xCS/ xMUTE RECV RECI AGND VSS 11 18 VDD year of production WW calendar week of production ...
Page 19
... Data Sheet AS2523, AS2524, AS2524B Copyright Copyright © 2002-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. 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. All products and companies mentioned are trademarks of their respective companies. ...