Mercury+ ™ IC OCXO | RRH and Small Cells

Issue: B, 25 October 2024

Specifications are subject to change without notice.

Copyright © 2014 to 2024 Rakon Limited. All rights reserved

Page 1 of 2

Contact Us

ROM1490PA

The ROM1490PA utilises market-leading proprietary Mercury+™ technology delivering the world’s first ASIC-based OCXO for Radio

applications. This product family achieves ±20 ppb frequency stability over -40 to 95°C, with short term ageing less than 1 ppb/day and

frequency slope as low as 0.1 ppb/°C. Extended operating temperature options are available on request. Using Rakon’s innovative high-Q

quartz crystals, ROM1490PA 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 ROM1490PA 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, 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

+95

°C

Operating temperatures up to 105°C are

available on request

Frequency stability temperature

±20

±10

ppb

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

Vc: ±20 ppb; Fixed frequency: ±10 ppb

Frequency slope ΔF/ΔT in still air

±0.1

±0.5

ppb/°C

Temperature ramp ≤ 1°C/minute

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

±20ppb 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

ppm

Per day, after 30 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

14.3 x 9.1 x 5.9

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