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TEA0678 датащи(PDF) 9 Page - NXP Semiconductors |
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TEA0678 датащи(HTML) 9 Page - NXP Semiconductors |
9 / 28 page 1996 Jun 06 9 Philips Semiconductors Preliminary specification Dual Dolby* B-type noise reduction circuit, automatic music search, with differential outputs and mute TEA0678 Notes to the characteristics 1. For the signal to be doubled (+6 dB) at differential output as a function of OUTC, the signal-to-ripple ratio is improved at differential output for approximately 3 dB. 2. By using the small load, the output voltage may be divided by −0.8 dB. 3. The high speed of the tape (FF, REW) at the tape head during AMS mode causes a transformation of level and frequency of the originally recorded signal. It means a boost of signal level of approximately 10 dB and more for recorded frequencies from 500 Hz up to 4 kHz. So the threshold level of −22 dB corresponds to signal levels in PB mode of approximately −32 dB. The AMS inputs for each channel are pin SCA and pin SCB. As the frequency spectrum is transformed by a factor of approximately 10 to 30 due to the higher tape speed in FF, REW, the high-pass filter (4.7 nF/24 k Ω) removes the effect of offset voltages but does not affect the music search function. In the application circuit (Fig.1) the frequency response of the system between tape heads input, e.g. pins INA2/INB2, to the AMS input pins SCA and SCB is constant over the whole frequency range (see Fig.3). The frequency dependence of threshold level is shown in Fig.3. 4. In AMS OFF mode, pin AMSEQ is HIGH level, the equalization time constant will be switched by pulling approximately 200 µA out of pin AMSEQ. This means for the device connected to pin AMSEQ, a restriction of input current at HIGH level less than 200 µA during AMS off; otherwise the switching of the time constants is disabled but fixed at 120 µs. If the following devices, input consumes more than 200 µA, this input has to be disconnected in AMS off mode. (To ensure switching the currents for the different switched modes are specified with a tolerance of ±50 µA in Chapter “Characteristics”.) For an application with a fixed EQ time constant of 120 µs the equalizing network may be applied completely external. Change 8.2 k Ω resistor to 14 kΩ the internal resistor REQ = 5.8 kΩ is short-circuited by fixing the EQ switch input at the 70 µs position (IEQ70). Table 1 Blank delay time set by resistor Rt at pin TD RESISTOR VALUE Rt (k Ω) DELAY TIME td TYP. (ms) TOLERANCE (%) 68 23 20 150 42 15 180 48 15 220 56 15 270 65 10 330 76 10 470 98 10 560 112 10 680 126 10 820 142 10 1000 160 10 |
Аналогичный номер детали - TEA0678 |
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Аналогичное описание - TEA0678 |
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