Belvidere, Ill. — NDK (Nihon Dempa Kogyo Co., Ltd.) has announced the availability of its COTS family of frequency control devices including crystals, XOs, TCXOs, VCXOs, SAW devices and FCXO modules.
NDK’s facilities have been qualified per MIL-STD-790 and NDK America has QPL status. The product offerings are suitable for high reliability, demanding environments such as defense communications, aerospace, down hole, and maritime applications.
The crystals are available in an operating temperature range of -40° to +150°C (less demanding temperatures are available) and frequencies up to 50 MHz. They feature high shock & vibration resistance and have proven themselves in on-engine automotive applications for years. They are all SMD with packaging as small as 3.2 x 2.5 mm (LxW).
The smallest COTS, GPS-grade TCXO (temperature compensated crystal oscillator) product features a very tight frequency stability of +/-0.5 ppm. The NT2016S measures 2.0 x 1.6 mm (LxW) and includes an enable/disable function, which allows for deactivation of the oscillator circuit to conserve power. They operate over a -30° to +85°C temperature range on as low as a 1.8-Vdc supply voltage.
The VCXOs (voltage controlled crystal oscillators) are available in frequencies up to 700 MHz. They have a frequency stability of +/-50 ppm and a frequency control range of +/-100 ppm/+1.65 +/-1.5 V. They operate over a temperature range of -40° to +85°C with a supply voltage of +3.3 Vdc, providing a LVCMOS, LVPECL, or LVDS output.
The SAW (surface acoustic wave) filter is a miniature 3.8 x 3.8 SMD that has proven itself in remote keyless entry (RKE) applications. Center frequencies are 315 and 433.92 MHZ (others available). The device features low insertion loss and excellent out-of-band rejection while operating in a temperature range of -40° to +105°C.
NDK also offers FCXO (frequency controlled crystal oscillator) modules. The NW34M25WA is a translation/synthesizer device that has a reference input HCMOS 19.44 MHz (others available), with output frequencies of LVPECL = 155.52 MHz, 77.75 MHz, Hi-Z and HCMOS of 77.75 MHz (others available). Free run accuracy is +/-20 ppm . The NW36M25LA is a FCXO advanced Stratum 3 module. It allows up to 4 HCMOS inputs and HCMOS outputs of 12.96 to 77.75 MHz, M/S 8 kHz, and a BITS_Clk. of 1.544 or 2.048 MHz.
Availability:Delivery is 8 to 12 weeks ARO. Qualified engineering samples may be ordered.