PT4308

Compact 433.92 MHz OOK/ASK Receiver

Tel: 886-2-66296288

‧Fax: 886-2-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan

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.

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

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

BLOCK DIAGRAM

LNA

Buffer

Amplifier

Limiter

RSSI

Data Filter

(LPF)

PLL

Reference

Oscillator

DO

XIN

ANT

VDD5

VSS

On-Chip

Regulator

VREG

CTH

CSF

(BPF)

I

Q

IRM

1

2

7

6

3

4

5

EN

8