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MINIREF

Product catalog summary

Overview
MINIREF is a high-stability OEM signal generator providing time and frequency reference signals (PPS, 10 MHz). It utilizes OCXO operation managed by GPS for precision. The device features two independent 10 MHz frequency outputs, one PPS time reference output, and one IRIG-B optical output. It supports both local and remote management via RS-232/RS485 and Ethernet (TCP/IP). MINIREF functions as an NTP server, operating as Stratum1 when GPS-locked and Stratum2 standalone. An optional linear voltage signal can be provided for external frequency source tuning.

Features
The device is powered by a Zilog eZ80F91 CPU at 50 MHz, with 2 MB SRAM and an embedded RZK + ZTS operating system. It includes a 10/100 network interface, supports up to 1,000 NTP clients, and features an integrated GPS receiver and high-stability OCXO. Customizable TTL interfaces, status LEDs, an integrated web server, and SNMP for remote management are also included.

Technical Specifications
Frequency Reference: 10 MHz sine wave with spectral purity of -70 dBc (harmonics) and -75 dBc (non-harmonics). Phase noise is -125 dBc at 1kHz. Outputs are tunable from -2dBm to 16 dBm, with 50 Ω impedance and BNC connectors. Stability is 1e-12 daily average when GPS-locked.
Time Reference: 1 PPS signal with 100µs duty and rising edge, and 1 IRIG-B output. Outputs are TTL 5 Vpp square wave with 50 Ω impedance and BNC connectors.
GPS Section: 12-channel receiver with 1.575,42 MHz frequency, tracking 12 satellites. PPS accuracy is < 50 nsec, with a TNC antenna connector and < 4 minutes acquisition time.
NTP Section: Supports NTP Version 4, operating as an NTP server with < 10 ms precision and Stratum 1.
Supply: Operates on 95 Vac – 240 Vac with an integrated IEC320 plug and EMI/RFI filter. Battery supply is 48Vdc with a rear Molex connector.
Signaling: RS-232 serial connection and Ethernet interface for network connection. Includes 4 dry contacts for signaling.
Size: 1U 19'' width, 300 mm depth excluding connectors.

Catalog excerpts

Digital Instruments MINIREF OEM Signal Generator

Open the catalog to page 1

Digital Instruments MINIREF OEM Signal Generator 1 MINIREF is a generator of Time and Frequency (PPS, 10 MHz) reference signals. High-stability is obtained through management algorithms of OCXO operation referenced by GPS. In standard version are presents two independent outputs of frequency reference at 10 MHz, 1 independent outputs of time reference PPS (pulse per second) and 1 IRIG-B (00x) optical output via ST or BNC. The device offers a 10 MHz and a TTL ouput customizable (e.g. IRIG B) MINIREF results extremely flexible in all applications where is essential supply a TimeFrequency reference...

Open the catalog to page 2

Digital Instruments MINIREF OEM Signal Generator 2 Features · Zilog eZ80F91 @ 50 MHz CPU · 2 MB SRAM · Embedded RZK + ZTS Operative System · 1x 10/100 Network interface via RJ45 interface · Support up to 1.000 NTP Client · Integrated GPS receiver · Internal high stability OCXO · 2x TTL customizable interfaces via BNC · Status LED’s for local management (LCD and crosspad as option) · Integrated web server and SNMP for remote management.

Open the catalog to page 3

Digital Instruments MINIREF OEM Signal Generator 3 Tech. Spec. Frequency reference Signal: 10 MHz sine wave. Spectral purity: -70 dBc at full output power. (harmonics), -75 dBc at full output power (non-harmonics). Phase noise: -125 dBc at 1kHz. Output: 2 independents. Output level: tunable from -2dBm to 16 dBm (or 13 dBm static). Output impedance: 50 Ω. Output connectors: BNC. Stability: 1e-12 daily average OCXO locked at GPS in SA. OCXO Standard: 1e-10 daily average OCXO in free run. Time reference Signal: 1 PPS, 100µs Duty, Rising Edge. 1 IRIG-B output (00x) via ST or BNC Output: N° 2 independents....

Open the catalog to page 4