7

U2741B

4733A–RKE–11/03

Oscillator frequency XTO

M-version: at T

N-version: full temperature range

(monitoring)

Crystal frequency = 13.56 MHz

Crystal frequency = 6.78 MHz

Load capacity of the crystal must be

selected accordingly

f

XTO

f

XTO

13.56 -

30 ppm

6.78 -

30 ppm

13.56

6.78

13.56 +

30 ppm

6.78 +

30 ppm

MHz

MHz

Loop bandwidth

For best LO noise

Loop filter components:

C

B

Loop

100

kHz

Phase noise PLL

Referring to the phase comparator

f

PN

PLL

-111

-105

dBC/Hz

Phase noise VCO

at 1 MHz

at 36 MHz

PN

VCO

PN

VCO

-91

-123

-87

-119

dBC/Hz

Frequency range of the VCO

f

VCO

300

450

MHz

Clock output

(CMOS microcontroller compatible)

Clk

out

f

MHz

Load capacitance at CLK

C

CLK

10

pF

Series resonance R of the crystal

f

f

f

f

Rs

Rs

Rs

Rs

80

100

150

225

W

FSK modulation frequency rate

Duty cycle of the

modulation signal = 50%

f

modFSK

020

kHz

ASK modulation frequency rate

Duty cycle of the

modulation signal = 50%

f

modASK

020

kHz

CLK output

- Output current Low

- Output current Low

- Output current High

- Output current High

V

V

V

V

I

ol

I

ol

I

oh

I

oh

150

200

-150

-200

100

µA

µA

µA

µA

ASK input

- Low level input voltage

- High level input voltage

- Input current High

V

ASKl

V

ASKh

I

ASKh

1.7

0.3

140

V

V

µA

FSK input

- Low level input voltage

- High level input voltage

- Input current High

V

FSKl

V

FSKh

I

FSKh

1.7

0.3

140

V

V

µA

Electrical Characteristics (Continued)

All parameters are refered to GND (pin 5). The possible operating ranges refer to different circuit conditions:

Parameters

Test Conditions

Symbol

Min.

Typ.

Max.

Unit