SCG4503 datasheet(2/16 Pages) CONNOR-WINFIELD

2 / 16 page

Data Sheet #: SG082

Page 2 of 16

Rev: 00

Date: 06/17/05

Absolute Maximum Rating

Table 1

Symbol

Parameter

Minimum

Nominal

Maximum

Units

Notes

Power Supply Voltage

-0.5

+4.0

Volts

1.0

Input Voltage

-0.5

+5.5

Volts

1.0

Storage Temperature

-65.0

+100

°C

1.0

General Description

The SCG4503 is a mixed-signal phase locked loop

generating LVPECL outputs from an intrinsically low

jitter, voltage controlled, crystal oscillator. The LVPECL

outputs may be disabled.

The SCG4503 can lock to one of two external

references, which is selectable using the SEL

AB input

select pin. The unit has a fast acquisition time of about

1.5 seconds and it is tolerant of different reference duty

cycles.

The SCG4503 includes an alarm output that

indicates deviations from normal operation. If a Loss-

of-Reference (LOR) or Loss-of-Lock (LOL) is detected

the alarm with indicate the need for a reference

rearrangement. If both references A and B are absent

the module will enter Free Run operation. The FR

status

pin will indicate that the module is in Free Run

operation. Frequency stability during Free Run

operation is guaranteed to ±20 ppm. Additionally the

Free Run mode may be entered manually.

The package dimensions are 1” x 1.025” x .45” on a

6 layer FR4 board with castellated pins. Parts are

assembled using high temperature solder to withstand

63/37 alloys, 180°C surface mount reflow processes.

Maximum Dimension Package Outline

Figure 1

Block Diagram

Figure 2

8 KHz PHASE

ALIGNER

REFB

REFA

SEL AB

ANALOG

FILTER

1 / N

ALARM

LOW JITTER

VCXO

FREE RUN STATUS

FORCE

FREE RUN

ENABLE/

TRI-STATE

Ω

10 k

Ω

10 k

Ω

10 k

Ω

10 k

Ω

DPFD

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