Circuit Centre – ECG Monitoring


The electrocardiogram featured in this issue’s Circuit Centre requires high- precision, low-noise analogue circuitry and a controller which can handle many input and output signals. This is reflected in the choice of parts highlighted in the following pages, which includes multiplexers, precision op amps and two very different microcontrollers from Cypress Semiconductor and NXP Semiconductors. Recommended […]

AVX – Zinc oxide varistors for ESD protection feature very low leakage current


AVX has expanded its zinc oxide- based series of varistors for ESD protection to include a version which features a low maximum leakage current of 1μA, helping to extend battery run-time in portable devices. Intended for use in applications requiring low power consumption, the UltraGuard series also offers a higher voltage rating and a faster […]

Cypress Semiconductor – High-performance parallel processing supports designs with multiple sensor inputs


Cypress Semiconductor’s PSoC® 5LP programmable system- on-chip combines a 32-bit ARM® Cortex®-M3 processor core with a hardware co-processor, CPLD-based digital fabric, high- precision programmable analogue blocks and a peripheral-to- peripheral DMA controller. Small and low-power, the PSoC 5LP chip offers very high parallel processing performance. In a product such as a heart monitor, it is […]

Diodes Incorporated – Buck converter drives 2A loads at high efficiency


The AP3512E from Diodes Incorporated is a 500kHz synchronous DC-DC buck converter, capable of driving a 2A load with high efficiency up to 93% and providing excellent line and load regulation. The AP3512E operates over an input-voltage range of 4.5V to 18V and provides an adjustable output voltage. Operating at a fixed frequency of 500kHz, […]

Diodes Incorporated – Compact Class-D amplifier for portable devices


The PAM8304 from Diodes Incorporated is a mono filterless Class-D amplifier offering a high signal-to-noise ratio up to 95dB and a differential input which helps to eliminate noise. It is capable of driving speaker loads as low as 3Ω from a 5V supply. Achieving high efficiency up to 90% and occupying a small 3mm x […]

Fairchild Semiconductor – Two-port multiplexer for storage and multimedia cards and peripherals


The FSSD06 from Fairchild is a two-port multiplexer which enables the output from a host application processor, baseband processor or ASIC to be routed to multiple Secure Digital (SD), Secure Digital I/O (SDIO) or Multimedia Card (MMC) cards or peripherals. The architecture includes the necessary bi-directional data and command transfer capability for single high-voltage cards, […]

Murata – Conduction-cooled 160W AC-DC power supply achieves 93% efficiency


Murata’s MVAD160 series of 160W AC-DC power supplies is packaged in an industry-standard 2” x 4” (51mm x 102mm x 38mm) format and achieves high efficiency up to 93%. Conduction-cooled, the MVAD160 power supplies are suitable for applications requiring fanless operation in an enclosure with little space for air circulation. The units comply with the […]

NXP Semiconductor – Analogue MUX/DEMUX devices provide eight channels


The 74HC4851 and 74HCT4851 from NXP Semiconductors are eight-channel analogue multiplexers/demultiplexers with three digital Select inputs, an active-low Enable input, eight independent I/Os and a common I/O. The devices’ injection current-effect control allows signals at disabled analogue input channels to exceed the supply voltage without affecting the signal of the enabled analogue channel. This eliminates […]

NXP Semiconductor – MCU with auxiliary processor for always-on sensor interfacing


NXP Semiconductors’ LPC4333 is a dual-core 32-bit microcontroller offering low-power operation in always-on sensing mode. The LPC4333 features an ARM® Cortex®-M4 main processor core supported by a low-power ARM Cortex-M0 co-processor which is code- and tool-compatible with the -M4 core. By configuring a system design so that the co-processor handles signal inputs from connected sensors […]

NXP Semiconductor – Small ESD protection diode for portable devices


The PESD36VS1UL from NXP Semiconductors is a uni- directional ESD protection diode in a small, leadless SOD882 surface-mount plastic package suitable for integration into portable devices. It protects one signal line from the damage caused by ESD and other transient voltage events. The device offers up to 30kV of ESD protection. It is AEC-Q101 qualified […]