EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE

Tel: +44 1460 230000 Fax: +44 1460 230001 email: info@euroquartz.co.uk web: www.euroquartz.co.uk

SYNCHRONOUS TIMING MODULES

Input Reference Frequency:

8, 16, 32 or 64kHz or <77.76MHz

Selectable by SELA & SELB pads

Output Frequency:

from 1.544MHz to 77.760MHz

Supply Voltage:

+3.3 Volts ±5%

Current Consumption:

Less than 80mA

Input Jitter Tolerance:

2us at 10Hz

Acquisition Time:

1 second

Capture/Pull-in Range:

±40ppm

Input Logic:

CMOS

Output Logic:

CMOS

Duty Cycle:

40%60% at 50% level

Rise and Fall Times:

2ns (20%~80% output levels)

Free Run Accuracy:

±15ppm maximum

Jitter at 77.760MHz:

7.5ps RMS typ. at 10Hz~1MHz

12kHz to 20MHz bandwidth

Operating Temperature Range

COMMERCIAL:

0°~+70°C (Code ‘C’)

INDUSTRIAL:

-40°~+85°C (Code ‘I’)

Loss of Reference (LOR) and Loss of Lock (LOL) active alarms.

Continuous input reference monitoring of external references.

Automatic FREE RUN mode on Loss Of Reference (LOR)

±15ppm output accuracy guaranteed.

Manually forced FREE-RUN mode by software control.

Tristate (output high impedance) for external testing.

+3.3V leadframe package, current <80mA.

1 second acquisition time

TMA SERIES SYNCHRONOUS TIMING MODULES

FEATURES

GENERAL SPECIFICATION

OUTLINES & DIMENSIONS

PART NUMBERS

DESCRIPTION

TMA (Synchronous Timing Module, model A) parts serve as a frequency

translator in telecommunications systems. The device translates any CMOS

input reference frequencies (8, 16, 32, 64kHz up to 77.760MHz) into

jitter-attenuated, phase locked reference synchronized output frequencies

up to 77.760MHz.

FUNCTIONAL BLOCK DIAGRAM

8kHz to 77.760MHz Inputs, up to 77.760MHz CMOS output

Page 1 of 2

Supply

Voltage

Package

Type

Operating

Temperature

Range

Input

Frequency

Output

Frequency

“3” for +3.3 V

TMA20

“C”=0°~+70°C

“I”=-40°~+85°C

Add “k”

for kHz

Output

Frequency

in MHz

Part numbers are generated according to this scheme:

EXAMPLE:

3TMA20-C-8K-77.760

Representing: +3.3V supply, TMA package, Commercial operating

temperature range, 8kHz input frequency and output frequency of

77.760MHz.

ABSOLUTE MAXIMUM RATINGS

Vcc

Supply Voltage relative to ground

-0.5V to 4.0V

Vin

Input Voltage relative to ground

-0.5V to 5.5V

Tstg

Storage Temperature (Ambient)

-65° to +150°C

Tref

Maximum reflow Temperature

240°C

Symbol

Description

Rating

PAD CONNECTIONS

1

REF OP

Reference Output

2

NC

Do not connect - factory use only

3

NC

Do not connect - factory use only

4

GND

Ground

5

FREE RUN

Control input to force FREE RUN

6

LOR

Logic 1 indicates Loss Of Reference

7

LOL

Logic 1 indicates Loss Of Lock

8

REFIN

Reference input

9

OUTPUT

VCXO output

10

E/D

Enable/Disable output

11

VCC

Supply Votage

12

TDO

Do not connect - factory use only

13

SEL A

Second bit reference frequency selection

14

SEL B

First bit reference frequency selection

Pad No. Pad Name

Description of Function