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BA7042 Arkusz danych(PDF) 4 Page - Rohm |
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BA7042 Arkusz danych(HTML) 4 Page - Rohm |
4 / 5 page 1 C (pF) 111 Optical disc ICs BA7042 FCircuit operation (1) Circuit configuration The control voltage, input through pin 1, is amplified by the control amplifier, then output to pin 7 and input to the VCO control circuit. The oscillation frequency of the VCO is determined by the attached capacitor and controlled according to the control voltage. Highly modulated FM signals can be produced by superimposing the control voltage with AC signals. (2) Block description (1) Control amplifier (pin 1, pin 7, pin 8) The differential amplifier’s positive input is pin 1, its nega- tive input pin 8, and its output pin 7. Set the input bias volt- age so that the pin 7 voltage is VCC / 2. The amplification degree is determined by the external constant. (2) VCO (pin 2, pin 3, pin 5) The oscillator’s center frequency is set with an external capacitor. Use the following equation to calculate oscilla- tion frequency : f (1.3 V7 )0.15) 102 [MHz] where C = C2 )C3, V7 = pin 7 voltage The oscillation frequency set by the capacitor is the cen- ter frequency in the VCO’s frequency variation range. The VCO can be given a roughly linear oscillation fre- quency by changing its control voltage. FOperation notes (1) Temperature drift of the oscillator circuit can be re- duced by configuring with a capacitor having a tempera- ture coefficient. Temperature drift with a capacitor having a temperature coefficient of zero is *30kHz / _C when C = 25pF, fO = 14.3MHz, VCTL = 2.5V. (2) The control amplifier’s frequency characteristics depend on NF. When used as a reversing amplifier, cutoff frequency is roughly 100kHz with a gain of 20dB. When configuring PLL circuits, remember that loop stability is affected by the amplifier’s frequency characteristics. |
Podobny numer części - BA7042 |
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Podobny opis - BA7042 |
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