MICRF219A

300MHz to 450MHz ASK/OOK Receiver with

Auto-Poll, RSSI, and Squelch

July 2011

M9999-071811-A

General Description

The MICRF219A is a 300MHz to 450MHz super-

heterodyne, image-reject, RF receiver with automatic gain

control, ASK/OOK demodulator, analog RSSI output, and

integrated squelch features. It only requires a crystal and a

minimum number of external components to implement.

The MICRF219A is ideal for low-cost, low-power, RKE,

TPMS, and remote actuation applications.

The MICRF219A achieves

−110dBm sensitivity at a bit

rate of 1kbps with 0.1% BER. Four demodulator filter

bandwidths are selectable in binary steps from 1625Hz to

13kHz at 433.92MHz, allowing the device to support bit

rates up to 20kbps. The device operates from a supply

voltage of 3.0V to 3.6V, and typically consumes 4.3mA of

supply current at 315MHz and 6.0mA at 433.92MHz. A

shutdown mode reduces supply current to 0.1μA typical.

The squelch feature decreases the activity on the data

output pin until valid bits are detected while maintaining

overall receiver sensitivity.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• –110dBm sensitivity at 1kbps with 0.1% BER

• Auto-polling mode with bit checking

• Supports bit rates up to 20kbps at 433.92MHz

• 25dB image-reject mixer

• No IF filter required

• 60dB analog RSSI output range

• 3.0V to 3.6V supply voltage range

• 4.3mA supply current at 315MHz

• 6.0mA supply current at 434MHz

• 13μA supply current in sleep mode

• 0.1μA supply current in shutdown mode

• 16-pin QSOP package (4.9mm x 6.0mm)

• −40°C to +105°C temperature range

• 3kV HBM ESD Rating

Ordering Information

Part Number

Temperature Range

Package

MICRF219AAYQS

–40

°C to +105°C

16-Pin QSOP

_________________________________________________________________________________________________________________________

Typical Application

MICRF219A Typical Application Circuit (433.92MHz, 1kbps)