MC3356P DIP IC

The MC3356 includes Oscillator, Mixer, Limiting IF Amplifier, Quadrature
Detector, Audio Buffer, Squelch, Meter Drive, Squelch Status output, and
Data Shaper comparator. The MC3356 is designed for use in digital data
communciations equipment.
? Data Rates up to 500 kilobaud
? Excellent Sensitivity: ? 3 dB Limiting Sensitivity
Excellent Sensitivity: 30 ?Vrms @ 100 MHz
? Highly Versatile, Full Function Device, yet Few External Parts are
Required
? Down Converter Can be Used Independently ? Similar to NE602

GENERAL DESCRIPTION
This device is intended for single and double conversion
VHF receiver systems, primarily for FSK data transmission
up to 500 K baud (250 kHz). It contains an oscillator, mixer,
limiting IF, quadrature detector, signal strength meter drive,
and data shaping amplifier.
The oscillator is a common base Colpitts type which can
be crystal controlled, as shown in Figure 1, or L?C controlled
as shown in the other figures. At higher VCC, it has been
operated as high as 200 MHz. A mixer/oscillator voltage gain
of 2 up to approximately 150 MHz, is readily achievable.
The mixer functions well from an input signal of
10 ?Vrms, below which the squelch is unpredictable, up to
about 10 mVrms, before any evidence of overload.
Operation up to 1.0 Vrms input is permitted, but non?linearity
of the meter output is incurred, and some oscillator pulling is
suspected. The AM rejection above 10 mVrms is degraded.
The limiting IF is a high frequency type, capable of being
operated up to 50 MHz. It is expected to be used at 10.7 MHz
in most cases, due to the availability of standard ceramic
resonators. The quadrature detector is internally coupled to
the IF, and a 5.0 pF quadrature capacitor is internally
provided. The ?3dB limiting sensitivity of the IF itself is
approximately 50 ?V (at Pin 7), and the IF can accept signals
up to 1.0 Vrms without distortion or change of detector
quiescent dc level.