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ML3356 Datasheet(PDF) 5 Page - LANSDALE Semiconductor Inc. |
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ML3356 Datasheet(HTML) 5 Page - LANSDALE Semiconductor Inc. |
5 / 9 page www.lansdale.com Page 5 of 9 Issue A LANSDALE Semiconductor, Inc. ML3356 Figure 6. Application with Self–Adjusting Bias on Data Shaper RF In 1:2 0.01 20 19 18 17 16 15 14 13 12 11 Data Out 5.0 V 10 k Car. Det. Out 0 V or 4.0 V 3.3 k 130 k 3.3 k 470 pF 15 k 18 k 150 pF RF Input Ground Data Output Comp(+) Comp(–) Squelch Status Squelch Control Demod Out Demod Filter Quad Input 1 470 k 470 pF 47 k 47 k 0.1 0.1 f = 10.7 1.5 µH APPLICATION NOTES (continued) Depending on the external circuit, inverted or noninverted data is available at Pin 18. Inverted data makes the higher fre- quency in the FSK signal a “one” when the local oscillator is above the incoming RF. Figure 5 schematic shows the com- parator with hysteresis. In this circuit the DC reference volt- age at Pin 17 is about the same as the demodulated output voltage (Pin 13) when no signal is present. This type circuit is preferred for systems where the data rates can drop to zero. Some systems have a low frequency limit on the data rate, such as systems using the MC3850 ACIA that has a start or stop bit. This defines the low frequency limit that can appear in the data stream. Figure 5 circuit can then be changed to a circuit configuration as shown in Figure 6. In Figure 6 the ref- erence voltage for the comparator is derived from the demodu- lator output through a low pass circuit where τ is much lower than the lowest frequency data rate. This and similar circuits will compensate for small tuning changes (or drift) in the quadrature detector. Squelch status (Pin 15) goes high (squelch off) when the input signal becomes greater than some preset level set by the resistance between Pin 14 and ground. Hysteresis is added to the circuit externally by the resistance from Pin 14 to Pin 15. Legacy Applications Information |
Número de pieza similar - ML3356_08 |
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Descripción similar - ML3356_08 |
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