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部品型式

ADG439FBRN

製品説明
仕様・特性

a High Performance 4/8 Channel Fault-Protected Analog Multiplexers ADG438F/ADG439F* FEATURES Fast Switching Times tON 250 ns max tOFF 150 ns max Fault and Overvoltage Protection (–40 V, +55 V) All Switches OFF with Power Supply OFF Analog Output of ON Channel Clamped Within Power Supplies If an Overvoltage Occurs Latch-Up Proof Construction Break Before Make Construction TTL and CMOS Compatible Inputs APPLICATIONS Data Acquisition Systems Industrial and Process Control Systems Avionics Test Equipment Signal Routing Between Systems High Reliability Control Systems FUNCTIONAL BLOCK DIAGRAMS ADG439F ADG438F S1 S1A DA S4A D S1B DB S8 S4B 1 OF 8 DECODER 1 OF 4 DECODER A0 A1 A2 EN A0 A1 EN GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The ADG438F/ADG439F are CMOS analog multiplexers, the ADG438F comprising 8 single channels and the ADG439F comprising four differential channels. These multiplexers provide fault protection. Using a series n-channel, p-channel, nchannel MOSFET structure, both device and signal source protection is provided in the event of an overvoltage or power loss. The multiplexer can withstand continuous overvoltage inputs from –40 V to +55 V. During fault conditions, the multiplexer input (or output) appears as an open circuit and only a few nanoamperes of leakage current will flow. This protects not only the multiplexer and the circuitry driven by the multiplexer, but also protects the sensors or signal sources which drive the multiplexer. 1. Fault Protection. The ADG438F/ADG439F can withstand continuous voltage inputs up to –40 V or +55 V. When a fault occurs due to the power supplies being turned off, all the channels are turned off and only a leakage current of a few nanoamperes flows. The ADG438F switches one of eight inputs to a common output as determined by the 3-bit binary address lines A0, A1 and A2. The ADG439F switches one of four differential inputs to a common differential output as determined by the 2-bit binary address lines A0 and A1. An EN input on each device is used to enable or disable the device. When disabled, all channels are switched OFF. 6. Trench Isolation Eliminates Latch-up. A dielectric trench separates the p- and n-channel MOSFETs thereby preventing latch-up. 2. ON channel turns OFF while fault exists. 3. Low RON. 4. Fast Switching Times. 5. Break-Before-Make Switching. Switches are guaranteed break-before-make so that input signals are protected against momentary shorting. 7. Improved OFF Isolation. Trench isolation enhances the channel-to-channel isolation of the ADG438F/ADG439F. *Patent Pending. REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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