MICRF230

400MHz to 450MHz ASK/OOK Receiver

with RSSI and Squelch

General Description

The

MICRF230

is

a

400MHz

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 MICRF230 is ideal for low-cost, low-power, RKE,

TPMS, and remote actuation applications.

The MICRF230 achieves

−112dBm sensitivity at a bit rate

of 1kbps with 1% BER. Four demodulator filter bandwidths

are selectable using SEL0 and SEL1 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 3.5V to 5.5V and typically consumes 6.0mA at

433.92MHz. The MICRF230 has a shutdown mode that

reduces current to 0.5µA. The squelch feature decreases

the activity on the data output pin until valid bits are

detected while maintaining overall receiver sensitivity.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• −112dBm sensitivity at 1kbps with 1% BER

• Supports bit rates up to 20kbps at 433.92MHz

• 25dB image-reject mixer

• No IF filter required

• 60dB analog RSSI output range

• 3.5V to 5.5V supply voltage range

• 6.0mA supply current at 434MHz

• 0.5

μA supply current in shutdown mode

• 16-pin 4.9mm × 6.0mm QSOP package

• −40°C to +105°C temperature range

• 2kV HBM ESD rating

Applications

• Automotive remote keyless entry (RKE)

• Long range RFID

• Remote fan and light control

• Garage door and gate openers

• Remote metering

• Low data rate unidirectional wireless data links

Typical Application

MICRF230 Typical Application Circuit for 433.92MHz

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 15, 2015

Revision 2.0