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TEA1110AG-S14-R データシート(PDF) 6 Page - Unisonic Technologies |
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TEA1110AG-S14-R データシート(HTML) 6 Page - Unisonic Technologies |
6 / 9 page TEA1110A LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 6 of 9 www.unisonic.com.tw QW-R108-014.C FUNCTIONAL DESCRIPTION Supply (pins LN, SLPE, VCC and REG) The UTC TEA1110A and its peripheral circuit derive the power supply from telephone line (see Fig.1). The IC generates a stabilized reference voltage (VREF) between pins LN and SLPE. The voltage at pin SLPE is proportional to the line current. VREF is temperature compensated and can be adjusted by means of an external resistor (RVA). VREF is set to 3.35 V, which can be increased by connecting RVA between pins REG and SLPE (see Fig.2) and be decreased by connecting RVA between pins REG and LN. The voltage at pin REG is used by the internal regulator to generate VREF and is decoupled by, which is connected to VEE. This CREG capacitor converted into an equivalent inductance (see Section “Set impedance”) realizes the set impedance conversion from its DC value (RSLPE) to its AC value (RCC in the audio-frequency range). In the following formula, the most appropriate value for RSLPE is 20 Ω. The changing of RSLPE will affect the DC characteristics; furthermore, it can influence the microphone and DTMF gains, the gain control characteristics, the side tone level and the maximum output swing on the line. The voltage at pin LN is: VLN = VREF +RSLPE×ISLPE ISLPE = IIINE-ICC-IP-I* Where: ILINE = line current ICC = current consumption of the IC IP = supply current for peripheral circuits I* = current consumed between LN and VEE. RCC + SLPE REG + VEE 2 3 11 + Vd 1 from pre amp ICC I* VCC 14 LN + - + IP - - Fig 1. Supply configuration. Rexch Vexch lline Rline UTC TEA1110A Ish ISLPE RSLPE 20Ω 619Ω CREG 4.7μF CVCC 100μF Peripheral circuits |
同様の部品番号 - TEA1110AG-S14-R |
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同様の説明 - TEA1110AG-S14-R |
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