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This application note discusses the design of isolated converters using simple switchers.

Extremely high-speed ADCs (>1 GSPS) demand a low-jitter sample clock in order to preserve signal-tonoiseratio (SNR). These 8- and 10-bit converters have best-case noise floors set by quantization noise.For an N-bit ADC sampling a full-scale sinusoid the well known expression for SNR (in dB) is: SNR =6.02N + 1.76. This sets the best case noise floor for an 8-bit ADC at −49.9 dBc. The noise f

The ADP5350, a power management IC (PMIC), combines one high performance buck regulator for single Li-Ion/Li-Ion polymer battery charging, a fuel gauge, a highly programmable boost regulator for LED backlight illumination, and three 150 mA LDO regulators.The ADP5350 operates in trickle charge mode and in constant current (CC) and constant voltage (CV) fast charge mode. It features an internal field effect transistor (FET) that permits battery isolation on the system power side.The ADP5350 fuel gauge is a space-saving and low current consuming solution. It is optimal for rechargeable Li-Ion battery-powered devices, and features a voltage-based, battery SOC measurement function.The ADP5350 boost regulator operates at a 1.5 MHz switching frequency. It can be operated as a constant voltage regulator or as a supplemental constant current regulator for multiple LED backlight drivers.The ADP5350 LED drivers can support a wide range of LED backlight configurations, either multiple LEDs in parallel or in series.The ADP5350 low dropout (LDO) regulators are optimized to operate at low shutdown current and quiescent current to extend battery life. The device also operates as a load switch that can be fully turned off or on.The I2C-compatible interface enables the programmability of all parameters, including status bit readback for operation monitoring and safety control.The ADP5350 operates over the ?40?C to +125?C junction temperature range and is available in a 32-lead, 5 mm ? 5 mm LFCSP package and a 32-ball, 3 mm ? 3 mm WLCSP package.Applications Rechargeable Li-Ion and Li-Ion polymer battery-powered devices Portable consumer devices Portable medical devices Portable instrumentation devices Wearable devices

This 600W wide voltage input dual phase power converter uses two emulated current-mode controllers 180 degrees out of phase to minimize input and output ripple current. Compared to conventional isolated power converters: this synchronous buck architecture provides a reduced footprint and BOM cost at higher levels of efficiency: greater than 97% over several operating conditions.

This is an LED driver/converter that can power up to three high output LEDs. It has an input voltage range of 9V-to-16Vin and an output of 10.5Vout @ 1A.

The AD7873 is a 12-bit successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The AD7873 operates from a single 2.2 V to 5.25 V supply, with a throughput rate of 125 kSPS.The AD7873 features direct battery measurement, temperature measurement, and touch pressure measurement. The AD7873 also has an on-board reference of 2.5 V that can be used for the auxiliary input, battery monitor, and temperature measurement modes. When not in use, the internal reference can be shut down to conserve power. An external reference can also be applied and varied from 1 V to VCC with an analog input range from 0 V to VREF. The device includes a shutdown mode that reduces the current consumption to less than 1 ?A.The AD7873 features on-board switches. This, coupled with low power and high speed operation, makes the device ideal for battery-powered systems with resistive touch screens. The part is available in a 16-lead, 0.15 inch quarter size outline package (QSOP), a 16-lead, thin shrink small outline package (TSSOP), and a 16-lead, lead frame chip scale package (LFCSP).PRODUCT HIGHLIGHTS Ratiometric conversion mode available, eliminating errors due to on-board switch resistances. On-board temperature sensor: ?40?C to +85?C. Battery monitor input. Touch pressure measurement capability. Low power consumption of 1.37 mW maximum with the reference off, or 2.41 mW typical with the reference on, at 125 kSPS and VCC at 3.6 V. Package options include 4 mm ? 4 mm LFCSP. Analog input range from 0 V to VREF. Versatile serial I/O ports.APPLICATIONS Personal digital assistants Smart hand-held devices Touch screen monitors Point-of-sale terminals Pagers

The LTM4675 is a dual 9A or single 18A step-down ?Module? (micromodule) DC/DC regulator with 40ms turn-on time. It features remote configurability and telemetry-monitoring of power management parameters over PMBus?an open standard I2C-based digital interface protocol. The LTM4675 is comprised of fast analog control loops, precision mixed-signal circuitry, EEPROM, power MOSFETs, inductors and supporting components.The LTM4675?s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. Input and output currents and voltages, output power, temperatures, uptime and peak values are readable. Custom configuration of the EEPROM contents is not required. At start-up, output voltages, switching frequency, and channel phase angle assignments can be set by pin-strapping resistors. The LTpowerPlay? GUI and DC1613 USB-to-PMBus converter and demo kits are available.The LTM4675 is offered in a 16mm ? 11.9mm ? 3.51mm BGA package available with SnPb or RoHS compliant terminal finish.APPLICATIONS System Optimization in Prototype and Production

The ADM1270 is a current-limiting controller that providesinrush current limiting and overcurrent protection for modularor battery-powered systems. When circuit boards are insertedinto a live backplane, discharged supply bypass capacitors drawlarge transient currents from the backplane power bus as theycharge. These transient currents can cause permanent damageto connector pins, as well as dips on the backplane supply thatcan reset other boards in the system.The ADM1270 is designed to control the inrush current, whenpowering on the system, via an external P-channel field effecttransistor (FET).To protect the system from a reverse polarity input supply, thereis a provision made to control an additional external P-channelFET. This feature prevents reverse current flow in case of a reversepolarity connection, which can damage the load or the ADM1270.The ADM1270 is available in a 3 mm ? 3 mm, 16-lead LFCSP anda 16-lead QSOP. Applications Industrial modules Battery-powered/portable instrumentation

A DSP/BIOS AIC23 Codec Device Driver for the TMS320C6416 DSK Application Report

DC918C-A: Demo Board for the LTC2207 16-Bit, 105Msps ADC.

This document discusses the use of impedance pneumography as a technique to measure respiration rate. The generation of high-frequency ac current source is described and the issues related to delay in modulated signal and finite transition times of carriers are addressed. The report also includesdescriptions of potential implementations of a respiration rate measurement system using the ADS1298

The TPS6200x EVM is available as the TPS62000 adjustable version set to 2.5V. The TPS62007 is a fixed 3.3V version: and the TPS62005 is a fixed 1.8V version.