Frequency and Timing SA.31m, SA.33m, and SA.35m Miniature Atomic Clock (MAC) SA.3Xm Newly Enhanced MAC SA.3Xm SA.31m Features Family High-precision atomic clock The SA.31m is targeted for applications Small form factor (standard OCXO The Microchip SA.3Xm marks a major that require an economical solution for pinout) step forward in the evolution of rubidium frequency stability, such as audio equip- 1.5 s typical holdover over atomic clocks. Based on a new gen- ment in studio applications. It can also temperature (SA.35m) eration of atomic clock technology, the be used as an independent frequency Low power consumption SA.3Xm family has a unique package source for next generation base stations, RoHs 6/6-compliant that enables unprecedented miniaturiza- smart grid infrastructure and Enterprise tion in a rubidium clock. It is suitable for network infrastructure. It enables Applications applications requiring compact design, transition from costly TDM backhaul Stand-alone (free-run) stable fre- low power consumption, low aging, and transport to economic and efficient quency source for audio equipment, precision in an economical and easily Ethernet transport. LTE base stations, smart grid, and adaptable package. enterprise network Infrastructure SA.33m Extended holdover for CDMA and Smallest Commercially The SA.33m has superior aging, WiMAX base stations Available Rubidium Clock tempco, and stability than the SA.31m. Stability for various other communica- Microchip has leveraged the significant ad - The SA.33m may be deployed in existing tion and transmission applications vances in miniaturization and integration to rubidium applications such as ex- design the world s first commercially avail - tended holdover (for CDMA/CDMA 2000 able miniature atomic clock. The SA.3Xm or WiMAX). has physical dimensions and packaging of SA.35m a small ovenized crystal oscillator (OCXO), The SA.35m is the premium grade of measuring 50.8 mm x 50.8 mm (2 2 ) the entire SA.3Xm family. It has the and standing at a mere 18.3 mm (0.72 ). best tempco and greatest performance The MAC is the worlds first commercially amongst all the versions of the family. available rubidium coherent population The SA.35m is suited for applications trapping atomic clock. It consumes less such as extended hold over for LTE-TDD power and has wide spectrum tempera- base stations and other applications that ture operation. This makes it useful for a require precision frequency and long range of timing and synchronization ap- hold-over. Economical for its perfor- plicationswireless base stations, wire line mance level, the SA.35m delivers pre- network infrastructure, defense systems, mium performance at an excellent price. and test and measurement devices. The small size of the SA.3Xm enables it to be easily mounted to a PCBA. www.microchip.com1 Specifications Electrical Environmental RF Outputs Specification Frequency 10 MHz Operating Temperature 10 C to 75 C baseplate 11 CMOS square wave, Magnetic Sensitivity <7 10 /Gauss (up to2 Gauss) Waveform 0 V 5 V DC DC(max) GR-63-CORE, issue 4, Humidity Logic Level V 0.55 V, V 2.3 V OL(max) OH(min) April 2012, section 4.1.2 7.7 g , at 1 hour/axis rms Rise/Fail Time <10 ns (15 pf, 1M load) Vibration MIL-STD-810, figure 514.7E-1, category 24 Duty Cycle 50% 10% (General Minimum Integrity Exposure) (Operating) No loss of lock Built-in Test Equipment Output 30 g, 11 ms half-sine pulse per MIL-STD-202, Humidity Shock Method 213, Test Condition J. Frequency Format CMOS (Operating) 9 perturbation 4 10 momentary 0 = Normal Operation Logic Storage and Transport (Non-operating) 1 = Alarm Serial Communications Temperature 55 C to 100 C Vibration Protocol RS232 10.9 g at 1 hour/axis per MIL-STD-810, rms (non-operating, figure 514.7E-1, Cat 24 unpackaged) Format CMOS 0 V to 5 V DC Shock 50 g, 11 ms half-sine pulse per MIL-STD-202, Baud Rate 57600 (8, N, 1) (non-operating, Method 213, Test Condition A unpackaged) Power Input Performance Parameters Supply Voltage/Current 5 V 0.1 V , max current <2.8 A DC DC Specification Power Consumption Warm-up Time <15 min (typical 25C) Warm-up 14 W max (10 C to 75 C) 9 (Time to <1 10 ) 11 8 W at 10 C, 5 W at 25 C, <5 10 Operating Retrace 5 W at 75 C baseplate (on-off-on: 24 hours, 48 hours, 12 hours) 11 8 <2 10 peak-to-peak Range: 1 10 Voltage Coefficient Analog Tuning (+5 V 0.1 V ) DC DC Input: 0 V5 V into 5 k 1 8 At 25 C and 5 VDC, unless otherwise specified. Range: 2 10 Digital Tuning 12 (resolution 1 10 ) Time Drift in a 24 hr Period 1.5 s, typical (10 C to 70 C, 16 C/hr) (SA.35m) MTBF 20 years at 40 C (ground, benign, GB) Per MIL-HDBK-217F 17 years at 40 C (ground, fixed, GF) Per Telcordia SR-332, 20 years at 40 C (ground, fixed, Issue 1 uncontrolled) 11 Accuracy at Shipment <5 10 www.microchip.com