DESCRIPTION
The PT4308 is a compact, fully integrated OOK／ASK
receiver with ±4 KV ESD （HBM）
protection for 433.92 MHz
frequency band and requires few external components.
The PT4308 consists of a low-noise amplifier （LNA）, an
image-rejection mixer （IRM）, a built-in channel-select filter
（CSF）, an OOK／ASK demodulator, a data filter, and a
data slicing comparator. The local oscillator （LO） sub
system incorporates a monolithic VCO, a ÷32 feedback
divider, a loop filter and a fast start-up reference oscillator
to form a complete phase-locked loop-based frequency
synthesizer for single channel applications.
The PT4308 is available in an 8-pin SOP package and is
specified over the temperature range from –40 to +85 °C
FEATURES
Normal operating of 4.3 mA at 433.92 MHz
Requires few external components
Achieves sensitivity of –114 dBm （peak ASK
signal level）
Supply voltage range: 2.1 to 5.5 V
Supports data rates up to 10 Kb／s
Wide input dynamic range with automatic gain
control handling
Image-rejection ratio of 25 dB
ESD protection level up to ±4 KV for HBM, ±400
V for MM and ±1 KV for CDM
APPLICATIONS
Automotive Remote Keyless Entry （RKE）
Remote control
Garage door and gate openers
Suitable for applications that must adhere to either
the European ETSI-300-220 or the North American
FCC（Part 15）regulatory standards
