Micrel, Inc.

MICRF229

April 15, 2015

5

Revision 1.0

Electrical Characteristics (Continued)

Symbol

Parameter

Condition

Min.

Typ.

Max.

Units

Reference Oscillator

Reference Oscillator Frequency

13.52313

MHz

Reference Buffer Input Impedance

RO1 when driven externally

1.6

kΩ

Reference Oscillator Bias Voltage

RO2

1.15

V

Reference Oscillator Input Range

External input, AC couple to RO1

0.2

1.5

Reference Oscillator Source

Current

300

µA

Demodulator

CTH Source Impedance

(5)

120

K

Ω

CTH Leakage Current In CTH

Hold Mode

1

10

nA

Digital / Control Functions

DO Pin Output Current

300

680

µA

Output Rise Time

15pF load on DO pin, transition time

600

ns

Output Fall Time

200

Input High Voltage

EN

V

Input Low Voltage

EN

V

Output Voltage High

DO

V

Output Voltage Low

DO

V

RSSI

(6)

RSSI DC Output Voltage Range

−110dBm RF input level

0.5

V

−50dBm RF input level

2.0

RSSI Output Current

5k

Ω load to GND, −50dBm RF input

level

400

µA

RSSI Output Impedance

240

Ω

RSSI Response Time

D[4:3] = 00, RF input power-stepped

from no input to

−50dBm

10

ms

RF Leakage

LO Leakage for 433.92MHz

−98

dBm

Notes:

5.

CTH source impedance is inversely proportional to the reference frequency. In production test, the typical source impedance value is verified with

12MHz reference frequency.

6.

RSSI exhibit variation through manufacturing process, it is recommended that the reading is calibrated by software in system MCU when it is being

used.