MERCURY+™ IC OCXO | RRH AND SMALL CELLS

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 noiseperformance, enabling Remote Radio Head PLLs to use a single reference clock to meet both network synchronisation requirements and airinterface 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.

FeaturesApplications

 Superior close-in phase noise with high-Q
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SC-cut crystal< 1% VCO linearity
Patented tilt compensation for lifetimeperformance
Fast warm up time
Ultra-reliable OTP memory programmingLower customer Total Cost of Ownership
through VLSI ASIC-integration

14.2 x 9.2 x 6.5 mm

Base Stations
5G RRH
Small Cells
Microwave transmission systems

Standard Specifications
Parameter

Min.

Nominal frequency

Typ.

Unit

Test Condition / Description

MHz

Standard frequencies: 10, 19.2, 20, 25, 30.72,±0.2±0.2

ppm
ppm

Initial accuracy at 25°C ±2°C
Pre to post reflow ∆F (measured ≥ 60 minutes
after reflow)+85°C±10±5±0.5±4.6

ppb

Max.

10 – 50

38.4, 50 MHz

Frequency calibration
Reflow shift
Operating temperature range
Frequency stability temperature-40

Frequency slope ΔF/ΔT in still air
All causes stability±0.1

Supply voltage stability
Load sensitivity
Warm-up time

±5±5Long term stability (Ageing)

115ppbppb
60

0.3
1.5
Supply voltage (Vcc)
Input power

12.7 – 5
1200
400
1.25ppb/°Cppm

1500
440
2.25±3.3
1secppbppm
VmW

In still air. Reference to (FMAX + FMIN)/2±10 ppb (Vc), ±5 ppb (Fixed frequency)
Temperature ramp ≤ 1°C/minute
Including calibration, temperature, supply
voltage & load changes and 20 years life,
reference to Fn±2% variation, reference to frequency at 3.3V
±10% variation, reference to frequency at 15pF
Time needed for frequency to be within ±20ppb reference to frequency after 1 hour, at
25°C. Parameter is frequency, assembly andoperating history dependent
Per day, after 60 days of continuous operation
First year
10 years±5%
Warm up
Steady state in still air at 25°C

Control voltage (Vc) 1
Frequency tuning
Linearity

0.25
±1.9

Oscillator output

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

Reference to frequency at Vc=1.25V
Deviation from straight line curve fit

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

Issue: B, 10 June 2021
Specifications are subject to change without notice
Copyright © 2019 Rakon Limited. All rights reserved

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MERCURY+™ IC OCXO | RRH AND SMALL CELLSFrequency
19.2 MHz
30.72 MHz38.4 MHzSSB Phase Noise(Typical value at 25°C)

1 Hz-80-73-70

10 Hz-110-105-102100 Hz-138-133-132

1 kHz-154-153-150

10 kHz-159-158-155

100 kHz-160-160-157

1 MHz-161-161-159

UnitdBc/Hz

Frequency Stability over Temperature @ 19.2 MHzFractional frequency(ppb)

Frequency Stability vs Temperature (5 units)-50-40-30-20-10

6 Frequency Stability (ppb)543210-1 01020-2-3-4-5-630

4050607080

90Temperature (°C)

Warm-up Time @ 19.2 MHz40

Frequency Stability (ppb)20Time after power on (sec)00102030405060708090 100 110 120-20-40Warm-up – The First Hour
Frequency Stability (ppb)

Frequency Stability (ppb)

Warm-up – The First 2 Minutes
40

Frequency Stability (ppb)20Time after power on (min)00102030405060-20-40

Model Outline and Recommended Pad Layout

PinConnections

1Control Voltage (Vc) / Do not connect (GND optional)*

2Vc_GND / Do not connect (GND optional)*

3GND

4Output

5NC
Supply Voltage (Vcc)

6NOTE
 Unit: mm
 Base: FR4
 Finish: 0.05 ~ 0.13 µm
Gold over 3 ~ 6 µm Nickelfor correct operation decouple the supply voltage with a 10 μF
capacitor close to the oscillator* Depending on detail specification
Issue: B, 10 June 2021
Specifications are subject to change without notice
Copyright © 2019 Rakon Limited. All rights reserved

Page 2 of 2sales@rakon.com