Mercury+ ™ IC OCXO | Networking & Stratum 3E

Issue: B, 10 June 2021

Specifications are subject to change without notice

Copyright © 2019 to 2021 Rakon Limited. All rights reserved

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ROM1490E

The ROM1490E uses Rakon’s market-leading proprietary Mercury+™ technology, delivering the world’s smallest footprint Stratum 3E OCXO

in a hermetic package. This product family delivers ±5 ppb frequency stability over -40 to 85°C and ageing of less than 1 ppb/day; fully

compliant with Stratum 3E specifications. The ROM1490E is an ideal solution for Telecom Boundary Clocks (T-BC) Class C and Class D, which

require low dynamic noise contribution from oscillators over the operating temperature range. Holdover of a few hours is available for select

temperature profiles.

Mercury+™ ASIC-OCXOs enable lower Total Cost of Ownership of customer equipment through significantly enhanced reliability. With a small

form factor and few discrete components, the ROM1490E consumes only 0.4W at room temperature and has faster warm up times than

traditional OCXOs.

Standard Specifications

Parameter

Min.

Typ.

Max.

Unit

Test Condition / Description

Nominal frequency (Fn)

10 – 50

MHz

Standard frequencies: 10, 12.8, 19.2, 20, 24.576,

25, 30.72, 38.4, 38.88, 49.152, 50 MHz

Frequency calibration

±0.2

ppm

Initial accuracy at 25°C ±2°C

Reflow shift

±0.2

ppm

Pre to post reflow ∆F (measured ≥ 60 minutes

after reflow)

Operating temperature range

-40

+85

°C

Frequency stability temperature

±5

ppb

In still air. Reference to (FMAX + FMIN)/2

Frequency slope ΔF/ΔT in still air

±0.1

±0.5

ppb/°C

Temperature ramp ≤ 1°C/minute

All causes stability

±4.6

ppm

Including calibration, temperature, supply voltage

& load changes and 20 years life, reference to Fn

Supply voltage stability

±5

ppb

±2% variation, frequency ≤ 26 MHz

Load sensitivity

±5

ppb

±10% variation, reference to frequency ≤ 26 MHz

at 15 pF

Warm-up time

15

60

sec

Time needed for frequency to be within ±20 ppb

reference to frequency after 1 hour, at 25°C.

Parameter is frequency, assembly and operating

history dependent

Long term stability (Ageing)

1

0.3

2.5

ppb

ppm

Per day, after 60 days of continuous operation

First year

20 years

Root Allan Variance (ADEV)

30*10 -12

20*10 -12

15*10 -12

15*10 -12

70*10 -12

tau = 0.1s

tau = 1.0s

tau = 10s

tau = 100s

tau = 1000s

Supply voltage (Vcc)

2.7 – 5

V

±5%

Input power

1200

400

1500

440

mW

Warm up

Steady state in still air at 25°C

Wander generation

› TDEV compliant with GR-1244 fig 5-4 & G.812

types II & III fig 2

› MTIE compliant with GR-1244 fig 5-5 & G.812

types II & III fig 1

Oscillator stabilised 24 hours at constant

temperature (±1°C, still air). Data subjected to

relevant loop filter values (-3dB cut-off, 2nd order

high pass)

Features

Applications

14.2 x 9.2 x 6.5

mm



Stratum 3E grade stability and ageing



Miniature SC-cut crystal



Low ADEV and RMS phase jitter



Fast warm up time



Ultra-reliable OTP memory programming



Lower customer Total Cost of Ownership

through VLSI ASIC-integration



Stratum 3E



PTP Enabled Ethernet Switches and

Routers



Cable Modem CMTS and Remote PHYs



G.8262, G.8262.1, G.8263, G.8273.2,

G.8273.3, G.8273.4