Mercury+™ IC OCXO | RRH and Small Cells

Issue: B, 26 August 2024

Specifications are subject to change without notice.

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ROM9070PA

The ROM9070PA uses Rakon’s market-leading proprietary Mercury+™ technology, delivering the world’s smallest and lowest

power OCXO for Radio applications. This product family achieves ±10 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. Low-g sensitivity and extended operating temperature

options are available on request. Using Rakon’s innovative high-Q quartz crystals, ROM9070PA 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 9 x 7 mm form factor and few discrete components, a ROM9070PA consumes only 0.4 W at room temperature and has

faster warm up times than traditional OCXOs.

1.0

Standard Specifications

Parameter

Min.

Typ.

Max.

Unit

Test Condition / Description

Nominal frequency (Fn)

10 – 50

MHz

Standard frequencies: 10, 19.2, 20, 25, 25.6,

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 reflowing)

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

±20 ppb (Vc), ±10 ppb (Fixed frequency)

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

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

9.7 x 7.5 x 3.9

mm



Miniature SC-cut OCXO with fast warm up time



Superior close-in phase noise with high-Q crystal



< 1% VCO linearity



Patented tilt compensation for lifetime performance



Ultra-reliable OTP memory programming



Lower customer Total Cost of Ownership through

VLSI ASIC-integration



Base Stations



5G RRH



Small Cells



Microwave transmission systems