Clock Synthesizer for Portable Systems

MDS 1493-17 A

6

Revision 101005

Integr ated Circuit System s

ICS1493-17

PRELIMINAR Y INFORMA T ION

AC Electrical Characteristics

Unless stated otherwise, VDDO = 1.8 V ±0.1 V, Ambient Temperature -10

°C to +80°C

Note 1: Measured with a 5 pF load.

Note 2: Finish from prior cycle to start of new cycle.

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Input Frequency

27

MHz

Output Rise Time

20% to 80%, Note 1

1.1

2.2

3.3

ns

Output Fall Time

80% to 20%, Note 1

1.1

2.2

3.3

ns

Output Impedance

VO=VDDO/2

33

46

68

Ω

Output Clock Duty Cycle

VDDO/2, 27 MHz,

Note 1

40

50

60

%

VDDO/2, Note 1

45

50

55

%

Absolute Clock Period Jitter

Note 1

± 225

ps

Frequency Synthesis Error

All outputs

0

ppm

Modulation Rate

30

35

40

kHz

Short Term Jitter

Cycle-to-cycle

225

375

ps

Long Term Jitter

27 MHz, n=1000

900

ps

Long Term Jitter

48 MHz, n=1000

750

ps

Long Term Jitter

22M and 22/24M,

n=1000

1200

ps

Long Term Jitter

37 MHz, n=1000

2.5

9

ns

Power-up Time

From minimum VDD

to outputs stable

1.5

4

ms

Output Enable Time

50

ns

Output Disable Time

20

ns

Switching Time

22/24M, Note 2

250

ns