EE-October 2018 Product Picks

Sept. 25, 2018

6 min read

USB Vector Network Analyzer

The LTC6952, LTC6953, LTC6955 and LTC6955-1 family of low jitter, high-performance clock generation and distribution devices support JESD204B subclass 1 clocking applications up to 7.5GHz. These products are suitable for high-speed data converter clocking applications, with a scalable architecture to provide thousands of synchronized low jitter clocks, each with a complementary SYSREF signal. LTC6952: ultralow jitter, 4.5GHz PLL with 11 outputs and JESD204B support. LTC6953: ultralow jitter, 4.5GHz clock distributor with 11 outputs and JESD204B support. LTC6955: ultralow jitter, 7.5GHz, 11 output fanout buffer. LTC6955-1: LTC6955 with additional ÷2 on one output. The LTC6952 is a high performance, ultralow jitter, JESD204B clock generation and distribution device. It includes a phase-locked-loop (PLL) core, consisting of a reference divider, phase-frequency detector (PFD) with a phase-lock indicator, ultralow noise charge pump and integer feedback divider. The LTC6952’s eleven outputs can be configured as up to five JESD204B subclass 1 device clock/SYSREF pairs plus one general purpose output, or simply 11 general-purpose clock outputs for non-JESD204B applications. Each output has its own individually programmable frequency divider and output driver. All outputs can be synchronized and set to precise phase alignment using individual coarse half-cycle digital delays and fine analog time delays. For applications requiring more than eleven total outputs, multiple LTC6952s can be connected using the EZSync™ or ParallelSync™ synchronization protocols. The LTC6953 is the clock distribution function of the LTC6952. The LTC6955 is an 11 output fanout buffer with a parallel interface that selects one of three states per output group: in-phase, 180° out of phase, or power-down. The LTC6955-1 is the same as the LTC6955-1 except one output has an integrated ÷2. All devices are offered in a 52-lead, 7 mm × 8 mm plastic QFN package. Analog Devices

Fault-insertion switching

This vendor has expanded its range of PXI fault-insertion switching. The new Model 40-202 PXI fault-insertion switches, available with 22 or 11 fault-insertion channels, were primarily designed to simulate fault conditions in automotive and avionics test applications involving the reliability testing of safety-critical controllers. They are specifically designed for differential signaling requirements, with capabilities to insert three different types of fault conditions between the test fixture and the equipment under test: open-circuit, short-circuit between signal pairs, and short-circuit to user-applied fault conditions such as power or ground. These new models complement a range of PXI fault-insertion switches, which are typically used in hardware-in-the-loop simulation applications for electronic control unit validation. Relays in-line with the signal paths allow open-circuit conditions to be simulated on either side or both sides of a signal pair. Relays between each channel pair enable adjacent signals to be shorted, and relays between signal paths and the fault connection allow the application of external fault conditions. The switching topology of the 40-202 fault insertion switches allows switching channels to be interconnected so that complex fault-insertion channels can be constructed. These products are supported by the vendor’s eBIRST switching-system test tools, which provide a quick and easy way of finding relay failures within the modules. In addition, Switch Path Manager signal-routing software may be used to simplify signal routing through complex switching systems. Pickering Interfaces

General-purpose digitizers add more speed

This vendor has added five new models to its general-purpose M2p.59xx Series PCIe 16-bit digitizer cards. The new versions extend the performance range by increasing the maximum sampling rate from 80 MS/s up to 125 MS/s. The increased sampling rate, together with higher overall bandwidth, enables the new cards to capture a wider range of electronic signals. It makes them suitable for use in applications where signals in the DC to 50-MHz frequency range need to be acquired and analyzed with speed and accuracy. Based on 16-bit ADC technology, the new M2p-596x Series includes models that provide 1, 2, 4, or 8 input channels. Multichannel models each have their own ADC and signal-conditioning circuitry to allow fully synchronous acquisitions on all the inputs. Importantly, the high-resolution 16-bit ADCs deliver 16 times more resolution than digitizers using older 12-bit technology and 256 times more resolution than what is available from digital scopes that commonly use 8-bit ADCs. The extra resolution translates directly into improved measurement capabilities and superior dynamic performance. The complete product has been packed into a half-length PCIe card, yet it still offers a full set of digitizer features. Each channel has its own programmable input amplifier with ranges between ±200 mV and ±10 V, programmable input offset for unipolar measurements, programmable input termination of 50 Ωand 1 MΩ and an integrated calibration circuit. Models are available with up to eight single-ended and up to four differential channels. Spectrum

Single output 600 to 1200W power supplies

The QS series of single-output medical and industrial power supplies are rated at 600 to 1200W. These configurable models have full MoPPs (Means of Patient Protection) isolation, low acoustic noise and a range of options including a PMBus communication with a high current standby voltage. With medical and industrial safety certifications, the power supplies are suitable for use in medical, test and measurement, communications and broadcast equipment. Accepting a wide range 90 to 264Vac, 47-440Hz input, the QS7 can deliver 1200W, the QS5 600W and the Q5H up to 1200W at high line and 700W with a low line (<180Vac) input. Three standard output voltages are available; 12V, 24V and 48V. The standby/signal option can be configured with output inhibit or enable remote on//off, a PMBus interface and a 5V 0.25A and/or a 5V 2A standby voltage. Case dimensions for the QS5 and QS5H are 127 x 63.3 x 270mm (W x H x D) and 176 x 63.3 x 270mm for the QS7. The QS5 and QS5H are available with an IEC 320 input connector, replacing the screw terminal block. Operating ambient temperatures are -20 to +70°C, with output power and output current linearly derating above 50°C to 50% at 70°C. The use of low-speed fan cooling reduces audible noise and also significantly reduces the ingress of dirt and other contaminants, improving product reliability. All models in the QS series have a seven-year warranty as standard. The power supplies have 4,000Vac (2 x MoPPs) input to output, 1,500Vac (1 x MoPP) input to ground and 1,500Vac (1 x MoPP) output to ground isolation. All models are certified to the IEC/EN/UL/CSA 60601-1, ANSI/AAMI ES 60601-1 and IEC/EN/UL/CSA 60950-1 safety standards, (designed to meet IEC/EN 61010-1), with CE marking for the Low Voltage, EMC and RoHS2 Directives. Earth leakage current is less than 300µA, and complies with the EN61000-6-3:2007 and EN60601-1-2:2015 (curve B conducted and radiated) emission standards. The units also meet the EN60601-1-2 and EN61000-6-2 immunity standards and are designed and manufactured under the control of ISO9001 and ISO13485 (including risk management). TDK-Lambda