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TEA2025G-D16-T 데이터시트(PDF) 4 Page - Unisonic Technologies |
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TEA2025G-D16-T 데이터시트(HTML) 4 Page - Unisonic Technologies |
4 / 7 page TEA2025 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 4 of 7 www.unisonic.com.tw QW-R107-033.B APPLICATION INFORMATION Input Capacitor Input capacitor is PNP type allowing source to be referenced to ground. In this way no input coupling capacitor is required. However, a series capacitor (0.22 uF)to the input side can be useful in case of noise due to variable resistor contact. Bootstrap The bootstrap connection allows to increase the output swing. The suggested value for the bootstrap capacitors (100uF) avoids a reduction of the output signal also at low frequencies and low supply voltages. Voltage Gain Adjust STEREO MODE (Figure 1) The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected between pin 6 (11) and ground. The frequency response is given approximated by: VOUT VIN = R1 Rf + R2 + 1 JWC1 With Rf=0, C1=100μF, the gain results 46 dB with pole at f=32 Hz. THE purpose of Rf is to reduce the gain. It is recommended to not reduce it under 36 dB. C1 Rf 6 (11) R2 R1 2 (15) Figure 1 BRIDGE MODE (Figure 2) The bridge configuration is realized very easily thanks to an internal voltage divider which provides (at pin 1) the CH 1 output signal after reduction. It is enough to connect pin 6 (inverting input of CH 2) with a capacitor to pin 1 and to connect to ground the pin 7. The total gain of the bridge is given by: and with the suggested values (C1 = C2 = 100 uF, Rf = 0) means: Gv = 52 dB with first pole at f = 32 Hz |
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