ADG508F| Datasheet

ADG508F, ADG509F, ADG528F

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FEATURES Low On Resistance (300 Typ) Fast Switching Times t ON 250 ns Max t OFF 250 ns Max Low Power Dissipation (3.3 mW Max) Fault and Overvoltage Protection ( 40 V to +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 Existing Multiplexer Applications (Both Fault-Protected and Nonfault-Protected) New Designs Requiring Multiplexer Functions GENERAL DESCRIPTION

4/8 Channel Fault-Protected Analog Multiplexers ADG508F/ADG509F/ADG528F*
FUNCTIONAL BLOCK DIAGRAMS
ADG508F/ADG528F
S1 S1A DA S4A D S1B DB S8 ADG528F ONLY WR RS 1 OF 8 DECODER S4B 1 OF 4 DECODER

ADG509F

A0 A1 A2 EN

A0 A1 EN

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. 6. Trench Isolation Eliminates Latch-up. A dielectric trench separates the p and n-channel MOSFETs thereby preventing latch-up.
ORDERING GUIDE

The ADG508F, ADG509F, and ADG528F are CMOS analog multiplexers, the ADG508F and ADG528F comprising eight single channels and the ADG509F comprising four differential channels. These multiplexers provide fault protection. Using a series n-channel, p-channel, n-channel 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 that drive the multiplexer. The ADG508F and ADG528F switch one of eight inputs to a common output as determined by the 3-bit binary address lines A0, A1, and A2. The ADG509F switches one of four differential inputs to a common differential output as determined by the 2-bit binary a
ddress lines A0 and A1. The ADG528F has on-chip address and control latches that facilitate microprocessor interfacing. An EN input on each device is used to enable or disable the device. When disabled, all channels are switched OFF.
PRODUCT HIGHLIGHTS

Model ADG508FBN ADG508FBRN ADG508FBRW ADG509FBN ADG509FBRN ADG509FBRW ADG528FBN ADG528FBP

Temperature Range 40 C to +85 C 40 C to +85 C 40 C to +85 C 40 C to +85 C 40 C to +85 C 40 C to +85 C 40 C to +85 C 40 C to +85 C

Package Option* N-16 R-16N R-16W N-16 R-16N R-16W N-18 P-20A

1. Fault Protection. The ADG508F/ADG509F/ADG528F can withstand continuous voltage inputs from 40 V to +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.
*Patent Pending.

*N = Plastic DIP; P = Plastic Leaded Chip Carrier (PLCC); RN = 0.15" Small Outline IC (SOIC), RW = 0.3" Small Outline IC (SOIC).

REV. D
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: www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2001