3

KESTX01

ELECTRICAL CHARACTERISTICS A.C.

T amb = –40

°C to + 85°C, V

or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated.

Parameter

Symbol

Value

Units

Conditions

Min

Typ

Max

Output current at

IF75

1.4

2.1

2.8

pk–pk

I

mod

=75

µA, F

o

=434MHz

fundamental, V

mA

Output current at

IF150

2.4

3.8

4.9

pk-pk

I

mod

=150

µA, F

o

=434MHz

Fundamental, V

CC

= 3.5V

mA

Output current

IF150(6V5)

3.0

4.6

5.6

pk–pk

I

o

=434MHz

fundamental V

CC

= 6.5V

mA

Output level at 2 x

–32

dBc

I

o

=434MHz

fundamental see note 1

(1)

Output level at 3 x

–11

dBc

I

o

=434MHz (1)

fundamental and all other

spurii see note 1

Phase detector gain

PDG

4.7

8

9.5

µA/rad

V

Extinction ratio

ER

40

dB

see note 2

VCO gain

G

VCO

110

MHz/V

TXEN settling time

Txe

5.0

ms

see note 3

Output sidebands due to

SB

–40

dBc

I

reference frequency

see note 4

(1, 4)

30dB rise timeRF envelope

T30R

380

ns

of Data pulse

30dB fall timeRF envelope

T30F

430

ns

of Data pulse

VCO operating frequency

400

434

460

MHz

V

Notes:

1. The spurii are specified relative to the fundamental, measured in a 300KHz resolution bandwidth.

2. Extinction ratio is defined as the ratio of the output power SPACE to output power MARK measured at the output

operating fequency.

3. Regulatory issues demand that transmission does not take place until the PLL has acquired lock and the VCO is

operating at its final output frequency. This requirement demands that pin TXEN is set high at least Txe ms prior to the

transmission of any data. This value is dependent on the PLL loop bandwidth and hence on the value of the external

loop filter component values. The specification value above is for the loop filter components shown in the applications

diagram (Figure. 6)

4. Sidebands on the output due to the PLL reference are a function of the PLL loop bandwidth and the application.

Reducing the closed loop bandwidth of the PLL loop will aid in reducing the level of the PLL reference spurii.