MICRF230 datasheet(13/20 Pages) MICREL

Part #	MICRF230

Description	400MHz to 450MHz ASK/OOK Receiver with RSSI and Squelch

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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13 / 20 page

Micrel, Inc.

MICRF230

configuration with MOS transconductor. Though the

MICRF230 has built-in load capacitors for the crystal

oscillator, the external load capacitors are still required

for tuning it to the right frequency. RO1 and RO2 are

external pins of the MICRF230 to connect the crystal to

the reference oscillator.

Figure 6. Reference Oscillator Circuit

Table 3. Reference Frequency Examples

RF Input Frequency (MHz)

Reference Frequency (MHz)

418.0

13.02708

433.92

13.52313

(9)

Note:

Empirically derived, slightly different from Equation 3.

Squelch Operation

Squelch operation can be used to limit the amount of

activity on the DO pin during normal operation, which is

particularly useful when interrupt generated on DO can

interfere with correct operation.

Table 4. Squelch Control

SQ Pin

Squelch Enable

Squelch Circuit Enabled

Squelch Circuit Disabled (default)

The external pin defaults high via an internal pull-up.

April 15, 2015

Revision 2.0

MICRF230 Datasheet(PDF) 13 Page - Micrel Semiconductor