MERCURY+™ IC OCXO | NETWORKING AND STRATUM 3E

ROM9070EA
The ROM9070EA uses Rakon’s market‐leading proprietary Mercury+™ technology, delivering the world’s smallest and lowest power Stratum
3E OCXO. This product family delivers ±10 ppb frequency stability over ‐40 to 95°C and ageing of less than 1 ppb/day; fully compliant withStratum 3E specifications. The ROM9070EA is an ideal solution for telecommunications equipment which require low dynamic noise
contribution from oscillators, and where small form factor, low cost and power are paramount.
Mercury+™ ASIC‐OCXOs enable lower Total Cost of Ownership of customer equipment through significantly enhanced reliability. With a small
9 x 7 mm form factor and few discrete components, the ROM9070EA consumes only 0.4W at room temperature and has faster warm up
times than traditional OCXOs.

Features

Applications

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 Stratum 3E
 PTP Enabled Ethernet Switches andMiniature SC‐cut OCXO
Stratum 3E grade stability and ageing
Low ADEV and RMS phase jitter
Fast warm up time
Ultra‐reliable OTP memory programmingLower customer Total Cost of Ownership throughVLSI ASIC‐integration

9.7 x 7.5 x 3.9 mm

Routers
 Cable Modem CMTS and Remote PHYs
 G.8262, G.8262.1, G.8263, G.8273.2,G.8273.3, G.8273.4

Standard Specifications
Parameter

Min.

Nominal frequency

Typ.

Max.

10 – 50

Unit

Test Condition / Description

MHz

Standard frequencies: 10, 12.8, 19.2, 20, 24.576,
25, 30.72, 38.4, 38.88, 49.152, 50 MHz
Initial accuracy at 25°C ±2°C

Frequency calibration

±0.2

ppm

Reflow shift±0.2ppm+95°C

Operating temperature range‐40Frequency stability temperature
Frequency slope ΔF/ΔT in still air±0.1

All causes stability±10ppbIn still air. Reference to (FMAX + FMIN)/2±0.5ppb/°C

Temperature ramp ≤ 1°C/minute±4.6ppm

Including calibration, temperature, supply voltage& load changes and 20 years life, reference to Fn±2% variation, frequency ≤ 26 MHz

Supply voltage stability±5ppb

Load sensitivity±5ppb

Warm‐up time

15Long term stability (Ageing)

Root Allan Variance (ADEV)

30*10 ‐12
20*10 ‐12
15*10 ‐12
15*10 ‐1270*10 ‐12

Supply voltage (Vcc)

2.7 – 5Input power
Wander generation

Oscillator output

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Pre to post reflow ∆F (measured ≥ 60 minutes
after reflow)

60

sec

10.3
2.5ppbppm±10% variation, reference to frequency ≤ 26 MHz
at 15pF
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
Per day, after 60 days of continuous operation
First year
20 yearstau = 0.1s
tau = 1.0s
tau = 10s
tau = 100s
tau = 1000s

V±5%

1200
1500mW
Warm up400440
Steady state in still air at 25°C
› TDEV compliant with GR‐1244 fig 5‐4 & G.812
Oscillator stabilised 24 hours at constanttypes II & III fig 2
temperature (±1°C, still air). Data subjected torelevant loop filter values (‐3dB cut‐off, 2nd order› MTIE compliant with GR‐1244 fig 5‐5 & G.812
high pass)types II & III fig 1› TDEV & MTIE compliant with G.8262, G.8262.1,G.8263, G.8273.2, G.8273.3, G.8273.4
Regulated CMOS output (1.0, 1.8, 2.5V) or standard CMOS (options)Page 1 of 2

MERCURY+™ IC OCXO | NETWORKING AND STRATUM 3E
Frequency Stability over Temperature @ 30.72 MHz
Frequency stability over temperature (5 units)
Fractional frequency (ppb)20Frequency Stability (ppb)

151050‐50‐40‐30‐20‐10‐5 0102030

405060708090100

Temperature (°C)

‐10‐15‐20Warm‐up Time @ 19.2 MHz

40Warm‐up – The First Hour

Frequency Stability (ppb)

Frequency Stability (ppb)

Frequency Stability (ppb)

Warm‐up – The First 2 Minutes
302010Time after power on (sec)

0‐10 0102030405060708090 100 110 120‐20‐30‐4040Frequency Stability (ppb)302010Time after power on (min)0‐10 0102030405060‐20‐30‐40

Model Outline and Recommended Pad Layout

NOTE: Unit: mm
 Cover: plastic
 Base: FR4
 Finish: 0.05 ~ 0.13 µm Gold over3 ~ 6 µm Nickel.

PinConnections

1Do not connect (GND optional)

2GND

3

Output4for correct operation decouple the supply voltage
with a 10 μF capacitor close to the oscillator

Supply Voltage (Vcc)

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