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TEA1110A 데이터시트(PDF) 9 Page - Unisonic Technologies |
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TEA1110A 데이터시트(HTML) 9 Page - Unisonic Technologies |
9 / 9 page TEA1110A LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 9 of 9 www.unisonic.com.tw QW-R108-014.C FUNCTIONAL DESCRIPTION(Cont.) SIDETONE SUPPRESSION The UTC TEA1110A anti-side tone network consisting of RCC//Zline, Rast1, Rast2, Rast3, RSLPE and Zbal (see Fig.6) suppresses the transmitted signal in the earpiece. Maximum compensation is obtained under the following conditions: RSLPE×Rast1=RCC× (Rast2+Rast3) ) R × 1 Rast ( )) R + 3 Rast ( × 2 Rast ( = K SLPE SLPE Zbal= k×ZIine The scale factor k is mainly for the compatibility with a standard capacitor from the E6 or E12 range for Zbal. Zline varies considerably with the line type and the line length in practice. Therefore, the Zbal value should be set to be an average line length which gives appropriate side tone suppression with short and long lines. The suppression also depends on the accuracy of the match between Zbaland the impedance of the average line. The receiving signal is to be attenuated 32dB by the anti-side tone network from the line before it enters the receiving amplifier, and the attenuation is almost constant over the whole audio frequency range. Im Zbal SLPE IR VEE Zline LN Zir Fig.6 Equivalent circuit of UTC TEA1110A anti-sidetone bridge UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. |
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