MICRF102

Micrel

MICRF102

4

December 2006

Parameter

Condition

Min

Typ

Max

Unit

Digital / Control Section

Calibration Time

Note 9

, ASK data rate 20kbps

25

ms

Power Amplifier Output Hold Off

Note 10

, STDBY transition from LOW to HIGH

6

ms

Time from STBY

Crystal, ESR < 20Ω

Transmitter Stabilization Time

From External Reference (500mVpp)

10

ms

from STBY

Crystal, ESR < 20Ω

19

ms

Maximum Data Rate

– ASK modulation

Duty cycle of the modulating signal = 50%

20

kbits/s

Enable voltage

0.75V

DD

V

STBY Sink Current

5

6.5

µA

ASK pin

0.8V

DD

V

0.2V

DD

V

ASK input current

ASK = 0V, 5.0V input current

–10

0.1

10

µA

Note 9.

When the device is first powered up or it loses power momentarily, it goes into the calibration mode to tune up the transmit antenna.

Note 10.

After the release of the STDBY, the device requires an initialization time to settle the REFOSC and the internal PLL. The first MARK state

(ASK HIGH) after exit from STDBY needs to be longer than the initialization time. After that, highs and lows in the ASK pin callibrates the

output RF stage. See Figures 2, 3, and 4.

PC

VDD

VSS

REFOSC

ASK

MICRF102

R2

6.8k

C1

0.1µF

16V

+5VSW

R1

100k

ANTP

ANTN

STBY

+5VTX

R3

100k

R5

0Ω

C3

12pF 50V

(2.7pF 50V)

C2

8.2pF 50V

(4.7pF 50V)

L1

pcbant

C5

4.7µF

6.3V

C6 (np)

4.7µF

6.3V

Y1

9.84375MHz

(13.560MHz)

C4

100pF

50V

R4

(np)

+5VSW

+5VTX

REFOSC

Data

Figure 1.

Frequency Antenna

Height

Azimuth

EMI Meter Duty Cycle Corrected

Corrected 15:231b Limit

Margin

(MHz)

Polarity (meters)

(0-360)

Reading

Correction

Reading

Reading

(dBµV/m)

(dB)

(dBµV/m)

(dB)

(dBµV/m)

(µV/m)

434.03

V

2.5

140

64.2

5.4

58.8

871.00

80.8

22

868.5

V

1

150

53.1

5.4

47.7

242.70

60.8

33.1

434.03

H

1

150

76.1

5.4

70.7

3427.80

80.8

10.1

868.5

H

1.5

295

60.1

5.4

54.7

543.30

60.8

26.1

1302

V

1

195

41.1

5.4

35.7

61.00

54

18.3

1736

V

1

280

51.3

5.4

45.9

197.20

60.8

14.9

1302

H

2.5

110

49.4

5.4

44

158.50

54

10

1736

H

1

113

44.5

5.4

39.2

91.20

60.8

21.6

Note. Higher order harmonics were found to be below the noise floor of the receiving system for testing.

Table 1. Transmitted Power Measurement with Transmitted Frequency 433.92MHz, FCC Limits and Compliance