AN1833 Freescale Semiconductor / Motorola, AN1833 Datasheet - Page 9

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

Receiver Application Circuit Description/Design
AN1833
MOTOROLA
capacitively grounded, the size of this capacitor and the nature of the
data signal determine how faithfully the data slicer shapes up the
recovered signal. A control pin is provided to shut the data slicer output
off (DS off, pin 19).
The block diagram of the OOK receiver and its controller is shown in
Figure
single conversion OOK receiver circuit is shown in
on-board transistor is used as the LO source to down convert the
received 384-MHz RF carrier signal. Its VCO tuning frequency is
controlled by an automatic frequency control (AFC) circuit created with
the dc output from the MC13158 quadrature detector buffer amplifier and
an external loop filter.
OOK demodulation is achieved by using the MC13158 fast RSSI port.
The RSSI output is fed to the data slicer, which shapes the recovered
RSSI data into a rail-to-rail logic swing.
In the following sections, each part of the OOK receiver is explained in
more detail.
Freescale Semiconductor, Inc.
For More Information On This Product,
1a. The complete schematic of the MC13144 and MC13158
Go to: www.freescale.com
Receiver Application Circuit Description/Design
Figure
2. The internal
Application Note
9