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PDF SA602 Data sheet ( Hoja de datos )
| Número de pieza | SA602 | |
| Descripción | Double-balanced mixer and oscillator | |
| Fabricantes | Philips | |
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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 | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SA602.PDF ] | |
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