PDF SA612 Data sheet ( Hoja de datos )

Número de pieza	SA612
Descripción	Double-balanced mixer and oscillator
Fabricantes	Philips
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No Preview Available ! RF COMMUNICATIONS PRODUCTS SA612A Double-balanced mixer and oscillator Product specification Replaces data of September 17, 1990 IC17 Data Handbook 1997 Nov 07 Philips Semiconductors 1 page Philips Semiconductors Double-balanced mixer and oscillator Product specification SA612A Besides excellent low power performance well into VHF, the SA612A is designed to be flexible. The input, output, and oscillator ports can support a variety of configurations provided the designer understands certain constraints, which will be explained here. The RF inputs (Pins 1 and 2) are biased internally. They are symmetrical. The equivalent AC input impedance is approximately 1.5k \|\| 3pF through 50MHz. Pins 1 and 2 can be used interchangeably, but they should not be DC biased externally. Figure 5 shows three typical input configurations. The mixer outputs (Pins 4 and 5) are also internally biased. Each output is connected to the internal positive supply by a 1.5kΩ resistor. This permits direct output termination yet allows for balanced output as well. Figure 6 shows three single-ended output configurations and a balanced output. The oscillator is capable of sustaining oscillation beyond 200MHz in crystal or tuned tank configurations. The upper limit of operation is determined by tank “Q” and required drive levels. The higher the Q of the tank or the smaller the required drive, the higher the permissible oscillation frequency. If the required L.O. is beyond oscillation limits, or the system calls for an external L.O., the external signal can be injected at Pin 6 through a DC blocking capacitor. External L.O. should be 200mVP-P minimum to 300mVP-P maximum. Figure 7 shows several proven oscillator circuits. Figure 7a is appropriate for cordless phones/cellular radio. In this circuit a third overtone parallel-mode crystal with approximately 5pF load capacitance should be specified. Capacitor C3 and inductor L1 act as a fundamental trap. In fundamental mode oscillation the trap is omitted. Figure 8 shows a Colpitts varacter tuned tank oscillator suitable for synthesizer-controlled applications. It is important to buffer the output of this circuit to assure that switching spikes from the first counter or prescaler do not end up in the oscillator spectrum. The dual-gate MOSFET provides optimum isolation with low current. The FET offers good isolation, simplicity, and low current, while the bipolar circuits provide the simple solution for non-critical applications. The resistive divider in the emitter-follower circuit should be chosen to provide the minimum input signal which will assume correct system operation. 612A INPUT 12 612A 12 612A 12 a. Single-Ended Tuned Input b. Balanced Input (For Attenuation of Second-Order Products) Figure 5. Input Configuration c. Single-Ended Untuned Input SR00103 1997 Nov 07 5 5 Page Philips Semiconductors Double-balanced mixer oscillator DIP8: plastic dual in-line package; 8 leads (300 mil) Product specification SA612 SOT97-1 1997 Nov 07 11 11 Page

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