AD636
Data Sheet
Rev. E | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ........................................................................ 8
RMS Measurements ..................................................................... 8
The AD636 Buffer Amplifier ...................................................... 8
Frequency Response ..................................................................... 9
AC Measurement Accuracy and Crest Factor (CF) ................. 9
Applications ..................................................................................... 10
Standard Connection ................................................................. 10
Optional Trims for High Accuracy .......................................... 10
Single-Supply Connection ........................................................ 10
Choosing the Averaging Time Constant ................................. 11
A Complete AC Digital Voltmeter ........................................... 12
A Low Power, High Input, Impedance dB Meter ....................... 12
Circuit Description ................................................................ 12
Performance Data .................................................................. 12
Frequency Response ? dBm ............................................... 13
Calibration .............................................................................. 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
REVISION HISTORY
5/13Rev. D to Rev. E
Reorganized Layout ............................................................ Universal
Changes to Figure 1 ........................................................................... 1
Change to Table 1 .............................................................................. 4
Added Typical Performance Characteristics Section ................... 7
Added Theory of Operation Section; Changes to Figure 7 and
Figure 8 ............................................................................................... 8
Changed Applying the AD636 Section to Applications Section;
Changes to Figure 9, Figure 10, and Single-Supply Connection
Section ............................................................................................... 10
Changes to Figure 11 ....................................................................... 11
Changes to Figure 13 and A Complete AC Digital Voltmeter
Section ............................................................................................... 12
Changes to Figure 17 and Figure 18 .............................................. 13
Changes to Ordering Guide ........................................................... 14
11/06Rev. C to Rev. D
Changes to General Description ..................................................... 1
Changes to Table 1 ............................................................................. 3
Changes to Ordering Guide .......................................................... 13
1/06Rev B to Rev. C
Updated Format .................................................................. Universal
Changes to Figure 1 and General Description .............................. 1
Deleted Metallization Photograph .................................................. 3
Added Pin Configuration and Function Description Section .... 6
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 14
8/99Rev A to Rev. B