AD8436JCPZ-R7 Analog Devices Inc, AD8436JCPZ-R7 Datasheet

AD8436JCPZ-R7

Manufacturer Part Number

AD8436JCPZ-R7

Description

65T4276

Manufacturer

Analog Devices Inc

Datasheet

1.AD8436JCPZ-R7.pdf (20 pages)

Specifications of AD8436JCPZ-R7

Accuracy %

0.5%

Bandwidth

1MHz

Supply Current

325ÂµA

Power Dissipation Pd

18mW

Supply Voltage Range

4.8V To 36V

Digital Ic Case Style

LFCSP

No. Of Pins

Operating Temperature Range

0Â°C To +70Â°C

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FEATURES

Computes true rms value instantly

High-Z FET separately powered input buffer

Precision dc output buffer

Wide supply range

Small size: 4 mm × 4 mm package

ESD protected

GENERAL DESCRIPTION

The

true rms-to-dc converter that is loaded with options. It computes

a precise dc equivalent of the rms value of ac waveforms, including

complex patterns such as those generated by switchmode power

supplies and triacs. Its accuracy spans a wide range of input levels

(see Figure 2) and temperatures. The ensured accuracy of ≤±0.5%

and ≤10 μV output offset result from the latest Analog Devices,

Inc., technology. The crest factor error is <0.5% for CF values

between 1 and 10.

The

misleading peak, averaging, or digital solutions. There is no

programming expense or processor overhead to consider, and the

4 mm × 4 mm package easily fits into those tight applications.

On-board buffer amplifiers enable the widest range of options

for any rms-to-dc converter available, regardless of cost. For

minimal applications, only a single external averaging capacitor

is required. The built-in high impedance FET buffer provides an

interface for external attenuators, frequency compensation, or

driving low impedance loads. A matched pair of internal resistors

enables an easily configurable gain-of-two or more, extending

the usable input range even lower. The low power, precision input

buffer makes the

Rev. 0

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 that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Accuracy: ±10 μV ± 0.5% of reading

Wide dynamic input range

Wide bandwidth:

Zero converter dc output offset

No residual switching products

Specified at 300 mV rms input

Accurate conversion with crest factors up to 10

Low power: 300 µA typical at ±2.4 V

Fast settling at all input levels

Dual: ±2.4 V to ±18 V

Single: 4.8 V to 36 V

AD8436

100 μV rms to 3 V rms (8.5 V p-p) full-scale input range

Larger inputs with external scaling

1 MHz for −3 dB (300 mV)

65 kHz for additional 1% error

≥ 10

is a new generation, translinear precision, low power,

delivers instant true rms results at less cost than

Ω, C

AD8436

≤ 2 pF

attractive for use in portable multi-

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

meters and other battery-powered applications. The precision

dc output buffer offers extremely low offset voltages, thanks to

bias current cancellation.

Unlike digital solutions, the

limiting performance at high or low amplitudes (see Figure 2).

A usable response of <100 μV and >3 V extends the dynamic

range with no external scaling, accommodating the most

demanding low signal conditions.

The

(4.8 V) to ±18 V (36 V). A and J grades are available in a compact

4 mm × 4 mm, 20-lead chip-scale package. The operating

temperature ranges are −40°C to 125°C and 0°C to 70°C.

OBUFIN+

OBUFIN–

IBUFGN

IBUFIN–

IBUFIN+

AD8436

100µV

True RMS-to-DC Converter

SUM

RMS

Figure 2. Usable Dynamic Range of the

FUNCTIONAL BLOCK DIAGRAM

operates from single or dual supplies of ±2.4 V

GREATER INPUT DYNAMIC RANGE

8kΩ

10kΩ

1mV

16kΩ

Low Cost, Low Power,

CAVG

RMS CORE

–

10kΩ

10pF

10mV

AD8436

Figure 1.

AD8436

∆Σ SOLUTION

CCF

DC BUFFER

FET OP AMP

has no switching circuitry

100mV

AD8436

VCC

100kΩ

VEE

16kΩ

AD8436

www.analog.com

vs.

IGND

OGND

OUT

IBUFOUT

OBUFOUT

ΔΣ

Related parts for AD8436JCPZ-R7

AD8436JCPZ-R7 Summary of contents

Page 1

FEATURES Computes true rms value instantly Accuracy: ±10 μV ± 0.5% of reading Wide dynamic input range 100 μV rms rms (8.5 V p-p) full-scale input range Larger inputs with external scaling Wide bandwidth: 1 MHz for ...

Page 2

AD8436 TABLE OF CONTENTS Features .............................................................................................. 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Thermal Resistance ...................................................................... 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical ...

Page 3

SPECIFICATIONS e = 300 mV ac (rms), frequency = 1 kHz sinusoidal, ac-coupled, ±V IN Table 1. Parameter Test Conditions/Comments RMS CORE Conversion Error Default conditions Vs. Temperature −40°C < T < 125 C Vs. Rail Voltage ±2 ...

Page 4

AD8436 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Internal Power Dissipation Input Voltage Output Short-Circuit Duration Differential Input Voltage Temperature Operating Range Storage Range Lead Soldering (60 sec) ESD Rating Stresses above those listed under Absolute Maximum Ratings may ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS IBUFOUT IBUFIN– IBUFIN+ NOTES 1. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN. 2. THE EXPOSED PAD SHOULD NOT BE CONNECTED. Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 DNC ...

Page 6

AD8436 TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, ±V = ± μF, 1 kHz sine wave, unless otherwise indicated AVG 5V 1V 100mV 10mV 1mV 100µV 50µV 50 100 1k 10k FREQUENCY (Hz) Figure 4. ...

Page 7

–3 –6 –9 –12 –15 100 1k 10k 100k FREQUENCY (Hz) Figure 10. Output Buffer, Small Signal Bandwidth 0.5 CAVG = 10µF 0.4 8 SAMPLES 0.3 0.2 0.1 0 ...

Page 8

AD8436 −10 −50 − TEMPERATURE (°C) Figure 16. FET Input Buffer Bias Current vs. Temperature 1000 750 500 250 0 −250 −500 −750 −1000 −50 −25 0 ...

Page 9

TEST CIRCUITS SIGNAL SOURCE CAV 4.7µF RMS RMS CORE AC-IN MONITOR 16kΩ PRECISION DMM OUT OGND PRECISION DMM Figure 20. Core Response Test Circuit Using Dual Supplies SIGNAL SOURCE 10µF CAV 4.7µF RMS RMS CORE AC-IN MONITOR 16kΩ PRECISION DMM ...

Page 10

AD8436 THEORY OF OPERATION OVERVIEW The AD8436 is an implicit function rms-to-dc converter that renders a dc voltage dependent on the rms (heating value voltage. In addition to the basic converter, this highly integrated functional circuit block ...

Page 11

The 16 kΩ resistor in the output converts the output current voltage that can be connected to the output buffer or to the circuit that follows. The output appears as a voltage source in series with 16 ...

Page 12

AD8436 APPLICATIONS INFORMATION USING THE AD8436 This section describes the power supply and feature options, as well as the function and selection of averaging and filter capacitor values. Averaging and filtering options are shown graphically and apply to all circuit ...

Page 13

For simplicity, Figure 28 shows ripple vs. frequency for four combinations of CAVG and CLPF 1 AC INPUT = 300mV rms CAVG = 1µF, CLPF = 0.33µF CAVG = 1µF, CLPF = 3.3µF CAVG = 10µF, CLPF = 0.33µF CAVG ...

Page 14

AD8436 Using the FET Input Buffer The on-chip FET input buffer is an uncommitted FET input op amp used for driving the 8 kΩ I-to-V input resistor of the rms core. Pin 3, Pin 4, and Pin 5 are the ...

Page 15

Configure the output buffer as shown in Figure 36 to invert the dc output. OUT 16kΩ CORE 9 13 OBUFIN– 16kΩ 12 OBUFIN+ OGND 32.4kΩ 8 Figure 36. Inverting Output Configuration Current Output Option If a current output is required, ...

Page 16

AD8436 AD8436 EVALUATION BOARD The AD8436-EVALZ provides a platform to evaluate performance. The board is fully assembled, tested and ready to use after the power and signal sources are connected. Figure photograph of the board. Signal connections ...

Page 17

GND1 GND2 GND3 GND4 GND5 GND6 TSUM INCOUP SUM AC DC DNC 1 CORE_BUF CORE CIN AC IN TRMSIN 10µF 2 RMS BUF TIBUFOUT 3 IBUFOUT TACIN RFBH 0Ω TIBFIN– IBUFIN– 0.47µF RFBL DNI TIBFIN+ 5 IBUFIN+ R1 ...

Page 18

... SEATING PLANE ORDERING GUIDE 1 Model Temperature Range AD8436ACPZ-R7 −40°C to +125°C AD8436ACPZ-RL −40°C to +125°C AD8436ACPZ-WP −40°C to +125°C AD8436JCPZ-R7 0°C to +70°C AD8436JCPZ-RL 0°C to +70°C AD8436JCPZ-WP 0°C to +70°C AD8436-EVALZ RoHS Compliant Part. 4.10 0.30 4.00 SQ ...

Page 19

NOTES Rev Page AD8436 ...

Page 20

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