MERCURY+™ IC OCXO

| RRH AND SMALL CELLS

Issue: B, 10 June 2021

Specifications are subject to change without notice

Copyright © 2019 Rakon Limited. All rights reserved

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ROM1490PS

The ROM1490PS uses Rakon’s market-leading proprietary Mercury+™ technology, delivering the world’s first ASIC-based and smallest OCXO

in a hermetic package. This product family delivers ±10 ppb frequency stability over -40 to 85°C with short term ageing less than 1 ppb/day

and frequency slope as low as 0.1 ppb/°C. Using Rakon’s innovative high-Q quartz crystals, ROM1490PS offers superior close-in phase noise

performance, enabling Remote Radio Head PLLs to use a single reference clock to meet both network synchronisation requirements and air

interface requirements.

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

and few discrete components, a ROM1490PS 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

10 – 50

MHz

Standard frequencies: 10, 19.2, 20, 25, 30.72,

38.4, 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

±10

±5

ppb

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

±10 ppb (Vc), ±5 ppb (Fixed frequency)

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, reference to frequency at 3.3V

Load sensitivity

±5

ppb

±10% variation, reference to frequency at 15pF

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

1.5

ppb

ppm

Per day, after 60 days of continuous operation

First year

10 years

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

Control voltage (Vc) 1

0.25

1.25

2.25

V

Frequency tuning

±1.9

±3.3

ppm

Reference to frequency at Vc=1.25V

Linearity

1

%

Deviation from straight line curve fit

Oscillator output

Regulated CMOS output (1.0, 1.8, 2.5V) or standard CMOS (options)

1 The GND of the control voltage (Vc) needs to be connected directly to pin 2 (GND) as ground lead impedance may cause performance degradation.

Features

Applications

14.2 x 9.2 x 6.5

mm

 Superior close-in phase noise with high-Q

SC-cut crystal

 < 1% VCO linearity

 Patented tilt compensation for lifetime

performance

 Fast warm up time

 Ultra-reliable OTP memory programming

 Lower customer Total Cost of Ownership

through VLSI ASIC-integration

 Base Stations

 5G RRH

 Small Cells

 Microwave transmission systems