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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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TEA1069A Arkusz danych(PDF) 10 Page - NXP Semiconductors |
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TEA1069A Arkusz danych(HTML) 10 Page - NXP Semiconductors |
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10 / 44 page  1998 Jan 08 10 Philips Semiconductors Product specification Versatile speech/dialler/ringer with music-on-hold TEA1069; TEA1069A MICROPHONE INPUTS MIC+ AND MIC − AND GAIN PINS GAS1 AND GAS2 The circuit has symmetrical microphone inputs. Its input impedance is 64 k Ω (2 × 32 kΩ) and its voltage gain is typically 52 dB (when R7 = 68 k Ω). Dynamic, magnetic, piezoelectric or electret (with built-in FET source followers) microphones can be used. Microphone arrangements are illustrated in Fig.7. Fig.7 Alternative microphone arrangements. Pin numbers in parenthesis refer to the TEA1069H and TEA1069AH. (1) Resistor may be connected to reduce the terminating impedance. a. Magnetic or dynamic microphone. b. Electret microphone. c. Piezoelectric microphone. handbook, full pagewidth MBH198 VEE VCC (1) 36 (32) 3 (41) 4 (42) 23 (18) 4 (42) 3 (41) 4 (42) 3 (41) MIC + MIC − MIC − MIC + MIC + MIC − The gain of the microphone amplifier can be adjusted between 44 dB and 52 dB to suit the sensitivity of the transducer in use. The gain is proportional to the value of R7 which is connected between GAS1 and GAS2. Stability is ensured by two external capacitors, C6 connected between GAS1 and SLPE and C17 connected between GAS1 and VEE. The value of C6 is 100 pF but this may be increased to obtain a first-order low-pass filter. The value of C17 is 10 times the value of C6. The cut-off frequency corresponds to the time constant R7 × C6. RECEIVING AMPLIFIER IR, QR AND GAR The receiving amplifier has one input (IR) and one output (QR). Earpiece arrangements are illustrated in Fig.8. The IR to QR gain is typically 31 dB (when R4 = 100 k Ω). It can be adjusted between 20 and 31 dB to match the sensitivity of the transducer in use. The gain is set with the value of R4 which is connected between GAR and QR. The overall receive gain, between LN and QR, is calculated by subtracting the anti-sidetone network attenuation (32 dB) from the amplifier gain. Two external capacitors, C4 and C7, ensure stability. C4 is normally 100 pF and C7 is 10 times the value of C4. The value of C4 may be increased to obtain a first-order low-pass filter. The cut-off frequency will depend on the time constant R4 × C4. The output voltage of the receiving amplifier is specified for continuous-wave drive. The maximum output voltage will be higher under speech conditions where the peak to RMS ratio is higher. |
Podobny numer części - TEA1069A |
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Podobny opis - TEA1069A |
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