3

SP5848

Preliminary Information

Tamb= -40

o

C to +80

o

C, Vcc = 4.5 to 5.5 V, These characteristics are guaranteed by either production test or

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

Characteristic

Pin

Value

Units

Conditions

Min

Typ

Max

Synthesiser 2 (DOWN)

RF2 input voltage

5,6

30

300

mV

rms

80 -1300MHz

RF2 input impedance

5,6

See Figure 5

RF2 division ratio

240

65535

Reference division 2

See Table 2

ratio

Comparison frequency 2

16.25

4000

KHz

Phase noise degrades above

250KHz

Equivalent phase noise

-144

dBc/Hz

SSB, within loop bandwidth, all

at phase detector 2

comparison frequencie up to

250KHz

Charge pump 2 output

2

See Table 4

current

Vpin 2=2V

Charge pump 2 output

2

±3

±10

nA

Vpin2 = 2V

leakage

Charge pump 2 drive

3

0.5

mA

Vpin 3 = 0.7V

output curent

Data, clock and enable

12,11,13

Input high voltage

3

Vcc

V

Input low voltage

0

0.7

V

Input current

-10

10

µA

All input conditions

hysterysis

0.8

Vpp

Clock rate

11

500

KHz

Bus timing -

Data set up

300

ns

Data hold

600

ns

Enable setup

300

ns

Enable hold

600

ns

Clock to enable

300

ns

Reference Oscillator

Crystal frequency

8, 9

2

16

MHz

See Figure 6 for application

External reference input

8

2

20

MHz

Sinewave coupled through

frequency

10nF blocking capacitor

External reference drive

8

0.2

0.5

Vpp

Sinewave coupled through

10nF blocking capacitor

Outputs ports P0 - P1

1, 20

See note 1

sink current

2

mA

Vport = 0.7V

leakage current

10

µA

Vport = Vcc

Note 1 Output ports high impedance on power up, with data, clock and enable at logic 0