090-44350-31 - MICROSEMI - Datasheet.Live

Features

• High-precision atomic clock

• Small form factor (standard OCXO

pinout)

• 1.5 µs typical holdover over

temperature (SA.35m)

• Low power consumption

• RoHs 6/6-compliant

Applications

• Stand-alone (free-run) stable frequency

source for audio equipment, LTE base

stations, smart grid, and enterprise

network Infrastructure

• Extended holdover for CDMA and

WiMAX base stations

• Stability for various other

communication and transmission

applications

Newly Enhanced MAC SA.3Xm Family

The Microsemi SA.3Xm marks a

major step forward in the evolution of

rubidium atomic clocks. Based on a new

generation of atomic clock technology,

the SA.3Xm family has a unique

package that enables unprecedented

miniaturization in a rubidium clock. It

is suitable for applications requiring

compact design, low power consumption,

extended aging, and precision in an

economical and easily adaptable

package.

Smallest Commercially Available Ru-

bidium Clock

Microsemi has leveraged the signiﬁcant

advances in miniaturization and

integration to design the world's ﬁrst

commercially available miniature atomic

clock. The SA.3Xm has physical

dimensions and packaging of a small

ovenized crystal oscillator (OCXO),

measuring 50.8 mm x 50.8 mm

(2" × 2") and standing at a mere 18.3mm

(0.72"). The MAC is the world’s ﬁrst

commercially available rubidium coherent

population trapping atomic clock. It

consumes less power and has wide-

spectrum temperature operation. This

makes it useful for a range of timing

and synchronization applications—

wireless base stations, wire line network

infrastructure, defense systems, and test

and measurement devices. The small

size of the SA.3Xm enables it to be easily

mounted to a PCBA.

SA.31m, SA.33m, and SA.35m

Miniature Atomic Clock (MAC) SA.3Xm

SA.31m

The SA.31m is targeted for applications

that require an economical solution

for frequency stability, such as audio

equipment in studio applications. It

can also be used as an independent

frequency source for next generation

base stations, smart grid infrastructure

and Enterprise network infrastructure.

It enables transition from costly TDM

backhaul transport to economic and

efﬁcient Ethernet transport.

SA.33m

The SA.33m has superior aging and

tempco, and better stability and phase

noise than the SA.31m. The SA.33m

may be deployed in existing rubidium

applications such as extended holdover

(for CDMA/CDMA 2000 or WiMAX).

SA.35m

The SA.35m is the premium grade of

the entire SA.3Xm family. It has the

best tempco and greatest performance

amongst all the versions of the family.

The SA.35m is suited for applications

such as extended hold over for LTE-TDD

base stations and other applications

that require precision frequency and

long hold-over. Economical for its

performance level, the SA.35m delivers

premium performance at an excellent

price.

MAC

Microsemi invented portable atomic timekeeping

with the world's rst family of miniature and chip scale

atomic clocks.

Choose MAC for best-in-class stability, size, weight, and

power consumption.

SA.31m, SA.33m, and SA.35m

Miniature Atomic Clock (MAC) SA.3Xm

MAC SA.3Xm Mechanical Diagram

Note: Connect Pin 2 to GND externally. Pin 2 and Pin 4 are not connected together internally.

SA.31m, SA.33m, and SA.35m

Miniature Atomic Clock (MAC) SA.3Xm

Speciﬁcations1

Electrical

RF Output

• Frequency 10 MHz

• Waveform CMOS square wave,

0 VDC–5 VDC(max)

• Logic level VOL(max) 0.55 V, VOH(min) 2.3 V

• Rise/fail time <10 ns (15 pf, 1MΩ load)

• Duty cycle 50% ± 10%

Built-in Test Equipment Output

• Format CMOS

• Logic 0 = Normal Operation

1 = Alarm

Serial Communications

• Protocol RS232

• Format CMOS 0 V to 5 VDC

• Baud rate 57600 (8, N, 1)

Power Input

• Supply voltage/current 5 VDC ± 0.1 VDC, max current

<2.8 A

• Power consumption Warm-up: 14 W max

(–10 °C to 75 °C)

Operating: 8 W at 10 °C, 5W at

25 °C, 5 W at 75 °C baseplate

• Voltage coefﬁcient <2 × 10–11 peak-to-peak

(+5 VDC ± 0.1 VDC)

Environmental

• Operating temperature –10 °C to 75 °C baseplate

• Magnetic ﬁeld

sensitivity

<±7 × 10–11/Gauss (up to

±2Gauss)

• Humidity GR-63-CORE, issue 4,

April 2012, section 4.1.2

• Vibration (operating) 7.7 grms, at 1 hour/axis

MIL-STD-810, ﬁgure 514.7E-1,

category 24 (General Minimum

Integrity Exposure) No loss of

lock

• Shock (operating) 30 g, 11 ms half-sine pulse per

MIL-STD-202, Method 213,

Test Condition J. Frequency

perturbation ≤4 × 10– 9

momentary

Storage and Transport (Non-operating)

• Temperature –55 °C to 100 °C

• Vibration

(non-operating,

unpackaged)

10.9 grms at 1 hour/axis per

MIL-STD-810, ﬁgure 514.7E-1,

Cat 24

• Shock (non-operating,

unpackaged)

50 g, 11 ms half-sine pulse per

MIL-STD-202, Method 213, Test

Condition A

Performance Parameters

• Warm-up time

(time to <1 × 10–9)

<15 min (typical at 25 °C)

• Retrace <±5 × 10–11 (on-off-on: 24hours,

48 hours, 12 hours at 25°C)

• Analog tuning Range: ±1 × 10–8

Input: 0V–5 V into 5 kΩ

• Digital tuning Range: ±2 × 10–8

(resolution ±1 × 10–12)

• Time drift in a 24 hr

period (SA.35m)

1.5 μs, typical (–10 °C to 70°C,

16°C/hr)

• MTBF Per MIL-HDBK-217F:

• ≥20 years at 40 °C

(ground, benign, GB)

• ≥17 years at 40 °C

(ground, ﬁxed, GF)

Per Telcordia SR-332, Issue 1:

• ≥20 years at 40 °C

(ground, ﬁxed, uncontrolled)

• Accuracy at shipment <±5 × 10–11 (25 °C)

1At 25 °C and 5 VDC, unless otherwise speciﬁed.

Microsemi Corporation (Nasdaq: MSCC) offers a comprehensive portfolio of semiconductor and system solutions for aerospace

& defense, communications, data center and industrial markets. Products include high-performance and radiation-hardened

analog mixed-signal integrated circuits, FPGAs, SoCs and ASICs; power management products; timing and synchronization

devices and precise time solutions, setting the world’s standard for time; voice processing devices; RF solutions; discrete

components; enterprise storage and communication solutions, security technologies and scalable anti-tamper products;

Ethernet solutions; Power-over-Ethernet ICs and midspans; as well as custom design capabilities and services. Microsemi is

headquartered in Aliso Viejo, California and has approximately 4,800 employees globally. Learn more at www.microsemi.com.

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2016–2018 Microsemi Corporation. All rights

reserved. Microsemi and the Microsemi logo are

registered trademarks of Microsemi Corporation.

All other trademarks and service marks are the

property of their respective owners.

Microsemi makes no warranty, representation, or guarantee regarding the information contained herein or the suitability of its products and services for any

particular purpose, nor does Microsemi assume any liability whatsoever arising out of the application or use of any product or circuit. The products sold

hereunder and any other products sold by Microsemi have been subject to limited testing and should not be used in conjunction with mission-critical equipment

or applications. Any performance speciﬁcations are believed to be reliable but are not veriﬁed, and Buyer must conduct and complete all performance and other

testing of the products, alone and together with, or installed in, any end-products. Buyer shall not rely on any data and performance speciﬁcations or parameters

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900-00378-000. Revision K. 3/18

SA.31m, SA.33m, and SA.35m

Miniature Atomic Clock (MAC) SA.3Xm

Ordering Information

Part Number Description3

090-44310-31 SA.31m Rubidium Clock, AT Disabled

090-44310-32 SA.31m Rubidium Clock, AT Enabled

090-44330-31 SA.33m Rubidium Clock, AT Disabled

090-44330-32 SA.33m Rubidium Clock, AT Enabled

090-44350-31 SA.35m Rubidium Clock, AT Disabled

090-44350-32 SA.35m Rubidium Clock, AT Enabled

090-44300-00 SA.3Xm Developer's Kit

3AT = analog tuning

Phase Noise (SSB)

Frequency Sa.35/SA.33m SA.31m

1 Hz <–70 dBc/Hz <–65 dBc/Hz

10 Hz <–87 dBc/Hz <–85 dBc/Hz

100 Hz <–114 dBc/Hz <–112 dBc/Hz

1 kHz <–130 dBc/Hz <–130 dBc/Hz

10 kHz <–140 dBc/Hz <–140 dBc/Hz

• Spurious (non-harmonic) <–85 dBc

Temperature Coefficient (Peak-to-Peak)

Temperature SA.35m SA.33m SA.31m

0 °C to 70 °C ≤7 × 10–11 ≤1 × 10–10 ≤7 × 10–10

–10 °C to 75 °C ≤1 × 10–10 ≤1.5 × 10–10 ≤1 × 10–9

Aging

Type SA.35m/SA.33m SA.31m

Daily2±2.5 × 10–11 ±4 × 10–11

Monthly2±1 × 10–10 ±3 × 10–10

Yearly ±1 × 10–9 ±1.5 × 10–9

2After 1 day and 1 month of operation, respectively.

Short-Term Stability (Allan Deviation)

Type SA.35m/SA.33m SA.31m

t = 1 s ≤3 × 10–11 ≤5 × 10–11

t = 10 s ≤1.6 × 10–11 ≤2.5 × 10–11

t = 100 s ≤8 × 10–12 ≤1 × 10–11

Physical

• Weight <85 g (<3 oz)

• Size 18.3 mm × 50.8 mm × 50.8mm

• Volume <49.5 cm3 (< 3.0 in3)

RoHS Compliance

• 6/6 RoHS-compliant