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这篇5页的应用笔记详细说明如何设置AD5933阻抗转换器的评估板,以及如何测量板上15 pF电容的阻抗。AD5933数据手册提供了更多信息,使用评估板时应加以参考。



June 2011

Instrumentation Amplifier features 1-nV/rt-Hz input noise

ad8429The AD8429 ultralow-noise instrumentation amplifier is ideal for measuring extremely small signals over a wide temperature range. Excellent for measuring tiny signals, the amplifier features industry-leading 1-nV/rt-Hz input noise and 50-µV max input offset voltage specifications.. Its common-mode rejection (CMR) increases from 80 dB at G=1 to 140 dB at G=1000, offering high rejection when it is most needed; and its high-performance pin-out allows CMR to be guaranteed from dc to 5 kHz. Its current-feedback architecture provides wide bandwidth and fast settling times: 15 MHz and 0.75 µs at G=1, 4 MHz and 0.65 µs at G=10, 1.2 MHz and 0.85 µs at G=100, and 0.15 MHz and 5 µs at G=1000. Gain is set from 1 to 10,000 with a single external resistor. A reference pin allows the output voltage to be offset. Operating on ±4-V to ±18-V supplies, the AD8429 draws 9 mA max over temperature. Specified from –40°C to +125°C, it is available in an 8-lead SOIC package and priced from $3.50 in 1000s.

SHARC Processors

adsp-21478/79The ADSP-21478 and ADSP-21479 fourth-generation low-power SHARC® processors offer increased performance, hardware-based filter accelerators, audio- and application-focused peripherals, and up to 5 Mbits of SRAM, making them ideal for professional and automotive audio applications. Their single-instruction, multiple-data (SIMD) core supports 32-bit fixed-point and 32-/40-bit floating-point arithmetic formats—performing up to 1800 MFLOPS with a 300-MHz clock. The variable instruction-set architecture (VISA) allows code to be decreased by 20% to 30%, increasing the available memory. Application-specific peripherals simplify hardware design, minimize design risks, and reduce time to market. The software-programmable signal routing unit (SRU) enables flexible routing of digital applications interface (DAI) blocks. Peripherals connected through the SRU include serial ports, SPI ports, S/PDIF transceiver, and an 8-channel asynchronous sample-rate-converter block. The digital peripheral interface (DPI) includes a UART and a two-wire interface. FIR, IIR, and FFT accelerators increase the total system performance. The DMA controller can transfer data from the serial ports to external 16-bit SDR SDRAMs through a glueless interface. All SHARC processors are pin- and code compatible. Specified from 0°C to +70°C (K-grade) or –40°C to +85°C (B-grade), the ADSP-21478/79 are available in 100-lead LQFP and 196-ball CSP-BGA packages and priced from $7.99 in 1000s.

Blackfin Embedded Processor

adsp-bf592The ADSP-BF592 Blackfin processors—optimized for cost-sensitive industrial, automotive, and medical applications—combine the multimedia signal-processing power of a single-instruction, multiple-data (SIMD) DSP with the control capabilities of a RISC microcontroller. With two 16-bit MACs, two 40-bit ALUs, four 8-bit video ALUs, and 132K bytes of core-addressable memory, they operate at up to 400 MHz. 64K bytes of factory-programmed instruction ROM contains VDK RTOS and C-runtime libraries. Peripherals include four timer/counters (three with PWM); two full-duplex synchronous serial ports (SPORTs) that support eight channels of I2S stereo audio; two SPI ports; one UART with IrDA support; a parallel peripheral interface (PPI) that supports ITU-R 656 video formats; a two-wire interface (TWI) controller; nine peripheral DMAs; two memory-to-memory DMA channels, an event handler, 32 GPIOs, a JTAG debugging interface, and a PLL. Specified from 0°C to +70°C (K-grade) or –40°C to +85°C (B-grade), the ADSP-BF592 is available in a 64-lead LFCSP package and priced from $3.56 in 1000s.


Bob Scannell, Medical MEMS: How Motion Sensing Is Transforming Next-Generation Medical Device Designs, European Medical Device Technology, 5/25/2011

Bob Scannell, Inertial MEMs, from Life-Enhancing to Life-Saving, MEMS Technology Review, 5/1/2011

Bill Crone, The Six Major Challenges of ECG Design and Mitigation Strategies, Medical Electronics Design, 3/23/2011

Tom O'Dwyer, Schrumpfende Medizingeräte, Design & Elektronik, 3/14/2011

Patrick Wiers, 波束成形系统的相位测量, Electronic Products, 3/1/2011

Paul Errico, Healthcare is Coming Home, New Electronics, 3/8/2011

Ken Marasco, “便携式医疗设备的电源管理考虑”, EPN, 3/1/2011

Jan-Hein Broeders, 针对病人护理的处理能力, EPN, 10/19/2010

Henri Sino, 滤除电磁干扰以降低精密模拟应用的误差, Analog Dialogue, 1/11/2011

Paul Errico, 半导体如何成就消费类医疗设备, ECN, 12/15/2010


Simplifying Point-of-Care Patient Monitor Design Using ECG AFE - This webcast will introduce an ECG Analog Front End (AFE) which integrates the functional blocks traditionally designed into an ECG system using discrete components, as well as respiration measurement and pace pulse detection. We will look at how this device addresses some of the main ECG design challenges including critical system level requirements. Register for June 15th premiere.

非成像医疗保健应用中的光电流测量 -- 光电检测器小电流测量相关的放大器设计挑战:以脉搏血氧仪和消费类测定仪为例,讨论光电二极管电流测量的一般问题。本研讨会将研究与光电检测器小电流测量相关的主要模拟设计挑战和噪声的根本原因,并讨论使应用的信噪比最大化所涉及到的权衡因素。

ECG和心率监控设计技术 -- 本网络研讨会介绍成熟的设计技术,用以解决医疗器件的EMI辐射、EMI耐受性、共模抑制、ESD和去颤保护问题。

面向21世纪消费医疗保健应用的运动监护技术 -- 本在线研讨会聚焦于医疗保健应用,对ADI公司用于21世纪运动监护设备的领先产品进行了介绍。

医疗应用解决方案:病人监护 -- 本在线研讨会由来自ADI公司和Avnet Electronics Marketing的技术专家共同主持,探讨ECG和脉搏血氧仪等病人监护应用的具体设计解决方案。


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