Mercury+ ™ IC OCXO | 5G RRHs and Small Cells

Issue: C, 31 August 2023

Specifications are subject to change without notice

Copyright © 2020 to 2023 Rakon Limited. All rights reserved

Page 1 of 2

Contact Us

ROM7050PA

The ROM7050PA mini SMD OCXO utilises Rakon’s market-leading proprietary Mercury+™ technology. This compact OCXO is a low-

power and small footprint in 7.5 x 5.5 mm solutions for radio and small cell applications. This product family achieves excellent

frequency stability of ±20 ppb over -40 to 95°C, with long-term ageing less than 1.5 ppm in 10 years and frequency sensitivity to

temperature (i.e. 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, ROM7050PA 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 (TCO) of customer equipment through improved reliability. With a

miniature footprint, the ROM7050PA consumes only 400 mW at room temperature and has a faster warm-up time 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, 25,

30.72, 38.4, 50 MHz

Frequency calibration1

±0.2

ppm

Initial accuracy at 25°C ±2°C

Reflow shift

±0.5

ppm

After 1 hour recovery at 25°C

Operating temperature range

-40

+95

°C

105°C available upon request

Frequency stability over

temperature in still air

±20

ppb

Reference to (FMAX + FMIN)/2

Frequency slope ΔF/ΔT in still air

±0.1

ppb/°C

Temperature ramp ≤ 1°C/minute

Supply voltage stability

±5

ppb

±2% variation, reference to frequency at 3.3 V

Load sensitivity

±5

ppb

±10% variation, reference to frequency at 15 pF

Warm-up time (F0 – F1)2

3

20

s

Time after power on needed for frequency F0

to be within ±25 ppb reference to frequency F1

after 1 hour

All causes stability (Ageing)

±4.6

ppm

Including calibration, temperature, supply

voltage & load changes over a 10 year life

Vibration sensitivity (Optional)

0.7

1

ppb/g

Gamma vector

Supply voltage (Vcc)

2.7 – 5

V

Nominal value in the range ±5% variation

Input power (Vcc = 3.3V)

1200

400

1500

440

mW

Warm-up

Steady-state in still air at 25°C

Root Allan Variance (RAV)

30x10 -12

20x10 -12

15x10 -12

40x10 -12

20x10 -11

tau = 0.1s

tau = 1.0s

tau = 10s

tau = 100s

tau = 1000s

Oscillator output

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

SSB Phase Noise

(Typical value at 25°C)

Frequency

1 Hz

10 Hz

100 Hz

1 kHz

10 kHz

100 kHz

1 MHz

Unit

10 MHz

-82

-114

-144

-158

-160

-160

-160

dBc/Hz

1

Frequency calibration’s limit is ±0.5 ppm when offering low g-sensitivity performance. | 2 Parameter is assembly and operating history dependent.

Features

Applications

7.5 x 5.5 x 3.3

mm



Smallest OCXO footprint industrywide: 7 x 5 mm



Excellent frequency stability: ≤±20 ppb

(-40 to 95°C, -40 to 105°C available upon request)



Low-frequency slope: 0.1 ppb/°C



Superior close-in phase noise

; noise floor as low as

-160 dBc/Hz for 10 MHz devices



Fast warm-up time (±20 ppb): <15s at -25°C, <20s at -40°C



Long-term stability: ≤1.5 ppm/10 years



Excellent g-sensitivity: 1 ppb/g



5G RRHs



4G/5G small cells



Fronthaul switches & routers



G.8273.x boundary clocks



Optical network equipment



Microwave transmission

systems