| Part Numbert | Mfg | Packt | D/C | Descriptiont | Qty | Company/Contact |
PC1639 Datasheet
PC1639 Price a) V is proportional to the supply voltage. Output tone amplitude, which is a function of (VDD - VREF), increases with supply voltage (Fig. 2). b) The temperature coefficient of VREF is low due to a single VBE drop. Use of a resistive divider also provides an accuracy of better than 10%. As a result, tone amplitude variations over tempuature and unit to unit differences are held to less than tl.OdB over normal. c) Resistor values in the divider network are so chosen that VREF is above the VBE drop of the tone output transistor even at the low end of the supply voltage range. The tone output clipping at low supply voltage is thus eliminated, which improves distortion per- formance. PC1639 on stock Coupling: - 3 dB nom. Impedance: 50 Q nom. Isolation: < 300 MHz: 20 dB min., 25 dB typ. > 300 MHz: 18 dB min., 22 dB typ. Insertion Loss: > 75 MHz: 0.75 dB max., 0.5 dB typ < 75 MHz: 0.5 dB max., 0.3 dB typ.
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