Low-Cost, 315MHz, 345MHz, and 433.92MHz

ASK Transceiver with Fractional-N PLL

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5

AC ELECTRICAL CHARACTERISTICS (continued)

(Typical Application Circuit, 50

unless otherwise noted.) (Note 1)

Note 1:

Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.

Note 2:

Note 3:

50% duty cycle at 10kHz ASK data (Manchester coded).

Note 4:

Guaranteed by design and characterization. Not production tested.

Note 5:

Time for final signal detection; does not include baseband filter settling.

Note 6:

Note 7:

Dependent on PC board trace capacitance.

Note 8:

Input impedance is measured at the LNAIN pin. Note that the impedance at 315MHz includes the 12nH

inductive degeneration from the LNA source to ground. The impedance at 434MHz includes a 10nH induc-

tive degeneration connected from the LNA source to ground. The equivalent input circuit is 50

Ω in series

with ~2.2pF. The voltage conversion is measured with the LNA input-matching inductor, the degeneration

inductor, and the LNA/mixer tank in place, and does not include the IF filter insertion loss.

Typical Operating Characteristics

SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

3.3

3.0

2.7

2.4

5.8

6.0

6.2

6.4

6.6

6.8

7.0

5.6

2.1

3.6

+85

°C

+125

°C

+25

°C

-40

°C

SUPPLY CURRENT vs. RF FREQUENCY

RF FREQUENCY (MHz)

425

400

325

350

375

6.1

6.2

6.3

6.4

6.5

6.6

6.7

6.8

6.0

300

450

+85

°C

+125

°C

+25

°C

-40

°C

DEEP-SLEEP CURRENT vs. TEMPERATURE

TEMPERATURE (

°C)

110

85

35

60

-10

-15

2

4

6

8

10

12

14

16

18

0

-40

RECEIVER

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CRYSTAL OSCILLATOR

Crystal Frequency

/ 24

MHz

Maximum Crystal Inductance

50

mH

2

ppm/V

Crystal Load Capacitance

(Note 7)

4.5

pF