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AS2524B Datasheet(PDF) 6 Page - ams AG |
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AS2524B Datasheet(HTML) 6 Page - ams AG |
6 / 20 page Data Sheet AS2523, AS2524, AS2524B austriamicrosystems Revision 1.13 Page 5 of 19 Functional Description DC conditions The normal operating mode is from 15mA to 100mA. An operating mode with reduced performance is from 5mA to 15mA. In the line hold range from 0mA to 5mA the device is in a power down mode. The DC characteristic is determined by the voltage at LI- pin and a 30Ω resistor between LI- and LS-pin. It can be calculated by the following equation: VLS = VLI + ILine * 30Ω. VLI can be programmed to be 3.5V or 4.5V. 2/4 wire conversion AS2523/24 has built in two Wheatstone bridges with one common ground. This provides a maximum of independence of AC-impedance and side tone from each other. One can adapt side tone without changing the AC- impedance. AC-impedance The AC-impedance of AS2523/24 is set to t.m. 1000Ω. With the external capacitor at CI-pin it can be programmed complex. With an external resistor of approx. 1.5kΩ connected to the LS-pin it can be programmed to 600Ω. Side Tone A good side tone cancellation can be achieved by using the following equation: ZBAL/ZLINE = 10 Transmit path The gain of the M1/M2 → LS is 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 at LS to 2Vp. There is LLC for this path. The gain of the M3/M4 → LS is set to +46dB. This gain can be changed by programming from +39dB to +54dB in 1dB steps on AS2523. The input is differential with an impedance of 10kΩ. The soft clip circuit limits the output voltage at LS to 2Vp. There is no LLC for this path. Receive path The gain of the LS → RO receive path is set to +7.5dB. This gain can be changed by programming from –7.5dB to +7.5dB in 1dB steps (Register Rxgain). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at RO to 1Vp. It prevents harsh distortion and acoustic shock. There is LLC for this path. The gain of the LS → LO receive path is set to +32dB. This gain can be changed by programming from +19dB to - 34dB in 1dB steps. The user can also change the gain via Register Handsfree receive end gain (See section "Handsfree"). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at LO to 1.1Vp. It prevents harsh distortion and acoustic shock. There is optional LLC for this path. Line Loss Compensation (AS2523, AS2524B) - programmable on AS2523 - not activated at AS2524 - permanently activated at AS2524B When it is activated, the transmit and receive gains for both I/O’s are decreased by 6dB at line currents from 20mA to 50mA or from 45mA to 75mA. Handsfree The handsfree function allows voice communication without using the handset (full 2-way speaker phone). 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 -20dB. The following table shows how voice switching is controlled TX_atten Backgnd noise monitor Voice switching speech RX voice switching circuit |
Similar Part No. - AS2524B |
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Similar Description - AS2524B |
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