AD737JNZ Analog Devices Inc, AD737JNZ Datasheet
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AD737JNZ
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AD737JNZ Summary of contents
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FEATURES Computes True rms value Average rectified value Absolute value Provides 200 mV full-scale input range (larger inputs with input attenuator) Direct interfacing with 3½ digit CMOS ADCs 12 High input impedance: 10 Ω Low input bias current ...
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AD737 TABLE OF CONTENTS Features .............................................................................................. 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 6 Thermal Resistance ...................................................................... 6 ESD Caution .................................................................................. 6 ...
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SPECIFICATIONS T = 25°C, ±V = ±5 V except as noted Specifications shown in boldface are tested on all production units at final electrical test. Results from these tests are used to calculate outgoing quality levels. Table ...
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AD737 Parameter Conditions Peak Transient ±V = +2.5 V input to S Input Pin 1 ±V = +2.8 V/−3 ±V = ± ±V = ±16 Input Resistance Input Bias ±V = ± ...
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Parameter Conditions 3 dB Bandwidth rms rms 100 mV rms 200 mV rms IN Low-Z Input (Pin 1) 1% Additional rms ...
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AD737 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Internal Power Dissipation Input Voltage Output Short-Circuit Duration Differential Input Voltage Storage Temperature Range CERDIP (Q-8) PDIP (N-8) and SOIC_N (R-8) Lead Temperature, Soldering (60 sec) ESD Rating Stresses above those ...
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PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS C COM AD737 POWER DOWN OUTPUT 3 TOP VIEW 6 (Not to Scale) – Figure 2. SOIC_N Pin Configuration (R-8) Table ...
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AD737 TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, ±V = ±5 V (except AD737J-5, where ± unless otherwise specified. 0 200mV rms 100µ 22µF F 0.3 0.1 0 –0.1 –0.3 ...
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V = 200mV rms 100µ 22µF F 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –60 –40 – TEMPERATURE (°C) Figure 11. Additional Error vs. Temperature 500 400 ...
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AD737 4.0 3.5 3.0 2.5 2.0 1.5 1 SUPPLY VOLTAGE (±V) Figure 17. Input Bias Current vs. Supply Voltage 1V 100mV C = 10µF AV 10mV C = 33µF AV 1mV 100µV 1ms 10ms 100ms ...
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V = ±2.5V 22µ 4.7µ 22µ 100mV 0.5% 10mV 10% 1mV –3dB 1% 100µV 0 FREQUENCY (kHz) Figure 21. Error Contours Driving Pin ...
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AD737 THEORY OF OPERATION As shown in Figure 24, the AD737 has four functional subsec- tions: an input amplifier, a full-wave rectifier, an rms core, and a bias section. The FET input amplifier allows a high impedance, buffered input at ...
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DC ERROR, OUTPUT RIPPLE, AND AVERAGING ERROR Figure 25 shows the typical output waveform of the AD737 with a sine wave input voltage applied. As with all real-world devices, the ideal output never exactly achieved; ...
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AD737 APPLICATIONS INFORMATION RMS MEASUREMENT—CHOOSING AN OPTIMUM VALUE FOR C AV Because the external averaging capacitor, C tified input signal during rms computation, its value directly affects the accuracy of the rms measurement, especially at low frequencies. Furthermore, because the ...
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Battery Operation All the level-shifting for battery operation is provided by the 3½ digit converter, shown in Figure 28. Alternatively, an external op amp adds flexibility by accommodating nonzero common-mode voltages and providing output scaling and offset to zero. When ...
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AD737 SWITCH CLOSED ACTIVATES POWER-DOWN MODE. AD737 DRAWS JUST 40µA IN THIS MODE 1PRV 0.01µF V 200mV IN 1N4148 9MΩ 2V 900kΩ 47kΩ 20V 1W 1N4148 90kΩ 200V POWER 10kΩ 1µF + INPUT SCALE FACTOR ADJ 69.8kΩ ...
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C C 10µ AD737 8kΩ COM FULL-WAVE RECTIFIER 8kΩ INPUT AMPLIFIER POWER BIAS 3 DOWN SECTION –V S RMS 4 CORE + R1** CAL CONNECT *Q1, ...
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AD737 AD737 EVALUATION BOARD An evaluation board, AD737-EVALZ, is available for experi- ments or for becoming familiar with rms-to-dc converters. Figure photograph of the board; Figure 35 to Figure 38 show the signal and power plane copper ...
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Table 7. AD737 Evaluation Board Bill of Materials Qty Name Description 1 Test loop Red 1 Test loop Green 2 Capacitor Tantalum 10 μ Capacitor 0.1 μ 0603, X7R 1 Capacitor Tantalum ...
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AD737 OUTLINE DIMENSIONS COPLANARITY 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497) 4 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.25 (0.0098) 8° 0.10 (0.0040) 0° 0.51 (0.0201) 0.10 0.31 (0.0122) 0.25 (0.0098) ...
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BSC 0.210 (5.33) MAX 0.015 0.150 (3.81) (0.38) 0.015 (0.38) MIN 0.130 (3.30) 0.115 (2.92) SEATING PLANE 0.022 (0.56) 0.005 (0.13) 0.018 ...
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... AD737AR −40°C to +85°C 1 AD737ARZ −40°C to +85°C AD737BQ −40°C to +85°C AD737JN 0°C to 70°C 1 AD737JNZ 0°C to 70°C AD737JR 0°C to 70°C AD737JR-REEL 0°C to 70°C AD737JR-REEL7 0°C to 70°C AD737JR-5 0°C to 70°C AD737JR-5-REEL 0° ...
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NOTES Rev Page AD737 ...
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AD737 NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00828-0-10/08(H) Rev Page ...