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TEA1065T データシート(PDF) 9 Page - NXP Semiconductors |
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TEA1065T データシート(HTML) 9 Page - NXP Semiconductors |
9 / 28 page March 1994 9 Philips Semiconductors Product specification Versatile telephone transmission circuit with dialler interface TEA1065 Microphone inputs MIC + and MIC− and gain adjustment connections GAS1 and GAS2 The TEA1065 has symmetrical microphone inputs, its input impedance is 40.8 k Ω (2 × 20.4 kΩ) and its voltage gain is typ. 38 dB with R7 = 68 k Ω. Either dynamic, magnetic or piezoelectric microphones can be used, or an electret microphone with a built-in FET buffer. Arrangements for the microphones types are illustrated in Fig.9. The gain of the microphone amplifier is proportional to external resistor R7, connected between GAS1 and GAS2, which can be adjusted between 30 dB and 46 dB to suit the sensitivity of the transducer. An external 100 pF capacitor (C6) is required between GAS1 and SLPE to ensure stability. A larger value of C6 may be chosen to obtain a first-order low-pass filter. The “cut-off” frequency corresponds with the time constant R7 × C6. Fig.9 Microphone arrangements. (a) magnetic or dynamic microphone, the resistor (1) may be connected to reduce the terminating impedance, or for sensitive types a resistive attenuator can be used to prevent overloading the microphone inputs; (b) electret microphone; (c) piezoelectric microphone. handbook, full pagewidth MBA553 VEE VCC 21 7 8 16 8 7 (1) (a) (b) (c) MIC + MIC − MIC − MIC + 8 7 MIC − MIC + |
同様の部品番号 - TEA1065T |
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同様の説明 - TEA1065T |
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