AN1833 Freescale Semiconductor / Motorola, AN1833 Datasheet - Page 7

• Manufacturer Part Number: AN1833
• Description: A Low-Power Wireless Remote Control Transmitter and Receiver
• Manufacturer: Freescale Semiconductor / Motorola

Description of the MC13158
AN1833
MOTOROLA
The MC13158 is an integrated, single-conversion, wideband FM
receiver system intended for digital and analog modulation formats. It
was developed as a high-performance IC to be used in battery-operated
radio systems, as it can be operated below 2 Vdc. The MC13158 is
available in a 32-lead, low-profile quad flat package (LQFP), which offers
small size layout and stable performance.
While it is an ideal receiver for the recovery of GFSK (Gaussian-filtered
shift keying), FSK (frequency-shift keying), or FM (frequency
modulation) signals, the circuit detailed in this application note shows
how the MC13158 system can be reconfigured to recover OOK signals.
Further details about the MC13158 not covered in this application note
are found in comprehensive device documentation [2].
The MC13158 functional blocks include:
The mixer has differential RF inputs allowing it to be used in balanced
and single-ended configurations. Its single-ended input impedance is
1 k in parallel with 4 picoFarads. Access is provided to the base and
emitter of the MC13158 internal oscillator transistor for attaching the
oscillator resonant tank circuit. The oscillator transistor internally drives
the mixer and can be operated as an LC oscillator to greater than
450 MHz. The application circuit (see
controlled oscillator (VCO) to provide LO drive at approximately
395 MHz.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Differential input mixer
40-dB IF amplifier
55-dB limiter amplifier
Externally tuned FM quadrature detector
Received signal strength indicator (RSSI)
Data slicer comparator
Carrier detection
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Figure
2) uses a varactor-
Description of the MC13158
Application Note
7