AS Telephone Line Interface And Speakerphone Circuit. is a CMOS integrated circuit that incorporates DC and AC line adaptation (DC-mask and. AS Datasheet PDF Download – Telephone Line Interface and Speakerphone Circuit, AS data sheet. austriamicrosystems AG AS datasheet, Telephone Line Interface and Speakerphone Circuit (1-page), AS datasheet, AS pdf, AS datasheet.
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datasheet for AS/4 by ams AG |
Applications Enhanced handsfree feature phones with CallerID and extended displays. Should be connected to RO via coupling capacitor.
The soft clip circuit limits the output voltage at LS to 2V p. There is no LLC for this path. The normal operating mode is from 15mA to mA. An operating adtasheet with reduced performance is from 5mA to 15mA. In the line hold range from 0mA to 5mA the ax2523 is in a power down mode. This gain can be changed by programming from —7.
datasheet for AS2523/4 by ams AG
The soft clip circuit limits the output voltage at RO to 1V p. It prevents harsh distortion and acoustic shock. There is LLC for this path.
It can be calculated by the following equation: V LI can be programmed to be 3.
AS Datasheet(PDF) – ams AG
The user can also change the gain via Register Handsfree receive end gain See section “Handsfree”. The soft clip circuit limits the output voltage at LO to 1.
There is optional LLC for this path. With an external resistor of approx. This provides a maximum of independence of AC-impedance and side tone from each other. One can adapt side tone without changing the ACimpedance.
Side Tone A good side tone cancellation can be achieved by using the following equation: Two voice controlled attenuators prevent acoustic coupling between the loudspeaker and the microphone.
The voice switching circuit has three states, namely idle, transmit or receive. In receive mode the attenuation of the receive path and the transmit path can be controlled by Register Handsfree receive end gain between 0dB and dB. Each register has 4 bit data width. Timing The data format for writing to a register has the following form: No Conf Tone Analog tone at RO Rx-offset setting 0 0 0mV 0 1 12mV 1 0 40mV 1 1 mV Mask, Lh, Hf, Hook Mask: For factory test only!
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. Each register has a default setting see data sheetwhich is set after power-up of the chip. The register contents cannot be read, they can only be written. This guarantees safe operation in case of unexpected loss of power during normal operation.
Re-writing all registers also eases later software updates, as only register contents need to be changed, but no additional command lines need to be inserted. Example of a typical power-up sequence A typical power-up sequence will require the following programming.
Other settings do not need to be re-written, as VDD has not discharged. As a safety margin however, it is recommended to re-write all registers after a flash Additional settings during line breaks If a line-break-detection brief interruption of the line while in off-hook state is implemented, the same rules apply as for a Flash: It is recommended to re-write all registers after a line-break, as a line break may take long enough to discharge VDD, even when the MASK bit was set.
General Rules The serial interface may be programmed at any time, it does not affect the speech quality, e. It is also possible to re-write all registers periodically. The register is static, therefore it can be clocked at any speed up to 5MHz. However, electromagnetic pulses on the clock and data lines may cause unwanted programming of the chip.
It is therefore recommended to keep these lines short, filter them by a discrete lowpass filter and reduce the clock speed accordingly.
The Power down mode is used during Flash and Pulse dialing and for On-hook operation. Typical mean values will not be tested. 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 datashet of their respective companies.
AS2523 Datasheet PDF
Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term of Sale. Therefore, prior to designing this product into a system, it is necessary to datazheet with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended daasheet range, unusual environmental requirements, or high reliability applications, such as dwtasheet, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application.
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