AD736-EVALZ Analog Devices Inc, AD736-EVALZ Datasheet
AD736-EVALZ
Specifications of AD736-EVALZ
Related parts for AD736-EVALZ
AD736-EVALZ Summary of contents
Page 1
... Compared to these circuits, the AD736 offers higher accuracy at an equal or lower cost. The AD736 can compute the rms value of both ac and dc input voltages. It can also be operated as an ac-coupled device by adding one external capacitor. In this mode, the AD736 can resolve input signal levels of 100 μ ...
Page 2
... AD736 TABLE OF CONTENTS Features .............................................................................................. 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 10 Types of AC Measurement ........................................................ 10 Calculating Settling Time Using Figure 16 ............................. 11 REVISION HISTORY 2/07—Rev Rev. H Updated Layout ...
Page 3
... V rms ±0.9 ±2.7 V ±4 Ω 300 300 mV rms rms ±1.7 V ±3.8 V ±11 V 9.6 6.4 8 9.6 kΩ ±12 ±12 V p-p ±3 ±3 mV ±3 ± μV/°C 150 50 150 μV/V 80 μV/V AD736 ...
Page 4
... Industrial −40°C to +85°C 1 Accuracy is specified with the AD736 connected as shown in Figure 18 with Capacitor C 2 Nonlinearity is defined as the maximum deviation (in percent error) from a straight line connecting the readings rms and 200 mV rms. Output offset voltage is adjusted to zero. 3 Error vs ...
Page 5
... Exposure to absolute ±V S maximum rating conditions for extended periods may affect Indefinite device reliability. +V and – –65°C to +150°C –65°C to +125°C ESD CAUTION 300°C 500 V = 110°C/W, and Rev Page AD736 ...
Page 6
... Connect an Auxiliary Low-Pass Filter Capacitor from the Output −V Negative Supply Voltage if Dual Supplies Are Used, or Ground if Connected to a Single-Supply Source Connect the Averaging Capacitor Here OUTPUT DC Output Voltage Positive Supply Voltage COM Common. C COM AD736 TOP VIEW C OUTPUT (Not to Scale – Figure 2. Pin Configuration Rev Page ...
Page 7
... C 1% ERROR 10% ERROR –3dB 1 10 100 –3dB FREQUENCY (kHz) Figure 7. Frequency Response Driving Pin 2 3ms BURST OF 1kHz = 3 CYCLES 200mV rms SIGNAL C = 10µ ± 22µ 100µ 33µ 100µ 250µ CREST FACTOR (V /V rms) PEAK AD736 1000 1000 5 AV ...
Page 8
... AD736 0 200mV rms IN 1kHz SINE WAVE 0 100mF 22mF F 0 ±5V S 0.2 0 –0.2 –0.4 –0.6 –0.8 –60 –40 – TEMPERATURE (°C) Figure 9. Additional Error vs. Temperature 600 V = 200mV rms IN 1kHz SINE WAVE C = 100µF AV 500 C = 22µ ±5V S 400 300 200 100 0 0.2 ...
Page 9
... SETTLING TIME Figure 16. RMS Input Level for Various Values of C 10nA 1nA 100pA 10pA 1pA 100fA – 22µ 0µ 100µF AV 10s 100s vs. Settling Time AV Rev Page –35 – TEMPERATURE (°C) Figure 17. Pin 2 Input Bias Current vs. Temperature AD736 105 125 ...
Page 10
... Figure 18. AD736 True RMS Circuit TYPES OF AC MEASUREMENT The AD736 is capable of measuring ac signals by operating as either an average responding converter or a true rms-to-dc converter. As its name implies, an average responding converter computes the average absolute value (or ac and dc) voltage or current by full-wave rectifying and low-pass filtering the input signal ...
Page 11
... CALCULATING SETTLING TIME USING FIGURE 16 Figure 16 can be used to closely approximate the time required for the AD736 to settle when its input level is reduced in amplitude. The net time required for the rms converter to settle is the difference between two times extracted from the graph (the initial time minus the final settling time example, consider the following conditions μ ...
Page 12
... Other waveforms, such as low duty-cycle pulse trains and SCR waveforms, have high crest factors. These types of waveforms require a long averaging time constant (to average out the long periods between pulses). Figure 8 shows the additional error vs. the crest factor of the AD736 for various values Rev Page ...
Page 13
... APPLICATIONS CONNECTING THE INPUT The inputs of the AD736 resemble an op amp, with noninverting and inverting inputs. The input stages are JFETs accessible at Pin 1 and Pin 2. Designated as the high impedance input, Pin 2 is connected directly to a JFET gate. Pin 1 is the low impedance input because of the scaling resistor connected to the gate of the second JFET ...
Page 14
... F 3 BIAS –V S SECTION –V S rms – CORE + C 1µF AV 33µ 10µF Figure 25. AD736 with a High Impedance Input Attenuator Rev Page the amplitude error is approximately −30% L that sets F at one-tenth of the Max Crest Factor (μF) (μF) Settling Time 5 150 10 360 ms ...
Page 15
... C C 10µF + (OPTIONAL) COM AD736 8 FULL +V S WAVE RECTIFIER 8kΩ 1µF OUTPUT OUTPUT 6 OUTPUT AMPLIFIER C AV rms 5 CORE + C AV 33µ 10µF (OPTIONAL) Adjustment OS C COM AD736 8kΩ 7 100kΩ OUTPUT 4.7µF 6 OUTPUT AMPLIFIER 4.7µ 100kΩ 33µ AD736 9V ...
Page 16
... AD736 EVALUATION BOARD An evaluation board, AD736-EVALZ, is available for experimentation or becoming familiar with rms-to-dc converters. Figure photograph of the board, and Figure 30 is the top silkscreen showing the component locations. Figure 31, Figure 32, Figure 33, and Figure 34 show the layers of copper, and Figure 35 shows the schematic of the board configured as shipped. The board is designed for multipurpose applications and can be used for the AD737 as well ...
Page 17
... Components Corp. TP-104-01-02 Components Corp. TP-104-01-05 Nichicon Corp. F931E106MCC KEMET Corp. C0603C104K4RACTU Nichicon Corp. F931C336MCC Components Corp. TP-104-01-07 Analog Devices, Inc. AD736JRZ Components Corp. TP-104-01-00 AMP 227161-1 3M 929836-09-03 Molex, Inc. 22-10-2031 Panasonic Corp. ERJ3EKF1004V Panasonic Corp. ERJ3GEY0R00V Molex, Inc. 22-10-2021 AD736 ...
Page 18
... AD736 OUTLINE DIMENSIONS 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. ...
Page 19
... AD736KR-REEL7 0°C to +70°C 1 AD736KRZ 0°C to +70°C 1 AD736KRZ-RL 0°C to +70°C 1 AD736KRZ-R7 0°C to +70°C 1 AD736-EVALZ RoHS compliant part. Package Description 8-Lead CERDIP 8-Lead CERDIP 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N ...
Page 20
... AD736 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00834-0-2/07(H) Rev Page ...