AD202

AD202/AD204 Low Cost, Miniature Isolation Amplifiers Data Sheet (Rev D)

Document overview

• Manufacturer or author: Analog Devices
• PDF pages: 12

Technical content

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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD202/AD204 Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 Low Cost, Miniature Isolation Amplifiers

FEATURES

Small Size: 4 Channels/lnch Low Power: 35 mW (AD204) High Accuracy: /H115500.025% Max Nonlinearity (K Grade) High CMR: 130 dB (Gain = 100 V/V) Wide Bandwidth: 5 kHz Full-Power (AD204) High CMV Isolation: /H115502000 V pk Continuous (K Grade) (Signal and Power) Isolated Power Outputs Uncommitted Input Amplifier

APPLICATIONS

Multichannel Data Acquisition Current Shunt Measurements Motor Controls Process Signal Isolation High Voltage Instrumentation Amplifier GENERAL DESCRIPTION The AD202 and AD204 are general purpose, two-port, trans- former-coupled isolation amplifiers that may be used in a broad range of applications where input signals must be measured, processed, and/or transmitted without a galvanic connection. These industry standard isolation amplifiers offer a complete isolation function, with both signal and power isolation provided for in a single compact plastic SIP or DIP style package. The primary distinction between the AD202 and the AD204 is that the AD202 is powered directly from a 15 V dc supply while the AD204 is powered by an externally supplied clock, such as the recommended AD246 Clock Driver. The AD202 and AD204 provide total galvanic isolation between the input and output stages of the isolation amplifier through the use of internal transformer-coupling. The functionally com- plete AD202 and AD204 eliminate the need for an external, user-supplied dc -to-dc converter. This permits the designer to minimize the necessary circuit overhead and consequently reduce the overall design and component costs. The design of the AD202 and AD204 emphasizes maximum flexibility and ease of use, including the availability of an uncommitted op amp on the input stage. They feature a bipolar ± 5 V output range, an adjustable gain range of from 1V/V to 100 V/V, ± 0.025% max nonlinearity (K grade), 130 dB of CMR, and the AD204 consumes a low 35 mW of power. The functional block diagrams can be seen in Figures 1a and 1b. PRODUCT HIGHLIGHTS The AD202 and AD204 are full-featured isolators offering numerous benefits to the user: Small Size: The AD202 and AD204 are available in SIP and DIP form packages. The SIP package is just 0.25" wide, giving the user a channel density of four channels per inch. The isolation barrier is positioned to maximize input to output spacing. For applications requiring a low profile, the DIP package provides a height of just 0.350". High Accuracy: With a maximum nonlinearity of ± 0.025% for the AD202K/AD204K ( ± 0.05% for the AD202J/AD204J) and low drift over temperature, the AD202 and AD204 provide high isolation without loss of signal integrity. Low Power: Power consumption of 35 mW (AD204) and 75 mW (AD202) over the full signal range makes these isolators ideal for use in applications with large channel counts or tight power budgets. Wide Bandwidth: The AD204’s full-power bandwidth of 5 kHz makes it useful for wideband signals. It is also effective in appli- cations like control loops, where limited bandwidth could result in instability. Excellent Common-Mode Performance: The AD202K/ AD204K provide ± 2000 V pk continuous common-mode isola- tion, while the AD202J/AD204J provide ± 1000 V pk continuous common-mode isolation. All models have a total common-mode input capacitance of less than 5 pF inclusive of power isolation. This results in CMR ranging from 130 dB at a gain of 100 dB to 104 dB (minimum at unity gain) and very low leakage current (2 mA maximum). Flexible Input: An uncommitted op amp is provided at the input of all models. This provides buffering and gain as required, and facilitates many alternative input functions including filtering, summing, high voltage ranges, and current (transimpedance) input. Isolated Power: The AD204 can supply isolated power of ± 7.5 V at 2 mA. This is sufficient to operate a low-drift input preamp, provide excitation to a semiconductor strain gage, or power any of a wide range of user-supplied ancillary circuits. The AD202 can supply ± 7.5 V at 0.4 mA, which is sufficient to operate adjustment networks or low power references and op amps, or to provide an open-input alarm.

REV. D–2– AD202/AD204–SPECIFICATIONS Model AD204J AD204K AD202J AD202K GAIN Range 1 V/V–100 V/V ** * Error ± 0.5% typ (± 4% max) ** * vs. Temperature ± 20 ppm/∞C typ (± 45 ppm/∞C max) ** * vs. Time ± 50 ppm/1000 Hours ** * Nonlinearity (G = 1 V/V) 1 ± 0.05% max ± 0.025% max ± 0.05% max ± 0.025% max Nonlinearity vs. Isolated Supply Load ± 0.0015%/mA ** * INPUT VOLTAGE RATINGS Input Voltage Range ± 5 V ** * Max lsolation Voltage (Input to Output) AC, 60 Hz, Continuous 750 V rms 1500 V rms 750 V rms 1500 V rms Continuous (AC and DC) ± 1000 V Peak ± 2000 V Peak ± 1000 V Peak ± 2000 V Peak Isolation-Mode Rejection Ratio (IMRR) @ 60 Hz RS £ 100 W (HI and LO Inputs) G = 1 V/V 110 dB 110 dB 105 dB 105 dB G = 100 V/V 130 dB ** * RS £ l kW (Input HI, LO, or Both) G = 1 V/V 104 dB min 104 dB min 100 dB min 100 dB min G = 100 V/V 110 dB min ** * Leakage Current Input to Output @ 240 V rms, 60 Hz 2 mA rms max ** * INPUT IMPEDANCE Differential (G = 1 V/V) 10 12 W ** * Common-Mode 2 G W/H206484.5 pF ** * INPUT BIAS CURRENT vs. Temperature (0 ∞C to 70∞C) ± 10 nA ** * INPUT DIFFERENCE CURRENT vs. Temperature (0 ∞C to 70∞C) ± 2 nA ** * INPUT NOISE Voltage, 0.1 Hz to 100 Hz 4 mV p-p ** * f > 200 Hz 50 nV/ ÷Hz ** * FREQUENCY RESPONSE Bandwidth (V O £ 10 V p-p, G = 1 V–50 V/V) 5 kHz 5 kHz 2 kHz 2 kHz Settling Time, to ± 10 mV (10 V Step) 1 ms ** * OFFSET VOLTAGE (RTI) Initial, @ 25 ∞C Adjustable to Zero ( ± 15 ± 15/G)mV max ( ± 5 ± 5/G) mV max ( ± 15 ± 15/G) mV max ( ± 5 ± 5/G) mV max vs. Temperature (0 ∞C to 70∞C) ±± ∞Ê ËÁ ˆ ¯˜10 10 G VCm ** * RATED OUTPUT Voltage (Out HI to Out LO) ± 5 V ** * Voltage at Out HI or Out LO (Ref. Pin 32) ± 6.5 V ** * Output Resistance 3 k W 3 kW 7 kW 7 kW Output Ripple, 100 kHz Bandwidth 10 mV p-p ** * 5 kHz Bandwidth 0.5 mV rms ** * ISOLATED POWER OUTPUT 2 Voltage, No Load ± 7.5 V ** * Accuracy ± 10% ** * Current 2 mA (Either Output) 3 2 mA (Either Output) 3 400 mA Total 400 mA Total Regulation, No Load to Full Load 5% ** * Ripple 100 mV p-p ** * OSCILLATOR DRIVE INPUT Input Voltage 15 V p-p Nominal 15 V p-p Nominal N/A N/A Input Frequency 25 kHz Nominal 25 kHz Nominal N/A N/A POWER SUPPLY (AD202 Only) Voltage, Rated Performance N/A N/A 15 V ± 5% 15 V ± 5% Voltage, Operating N/A N/A 15 V ± 10% 15 V ± 10% Current, No Load (V S = 15 V) N/A N/A 5 mA 5 mA TEMPERATURE RANGE Rated Performance 0 ∞C to 70∞C ** * Operating –40 ∞C to +85∞C ** * PACKAGE DIMENSIONS 4 DlP Package (N) 2.10" ¥ 0.700" ¥ 0.350" ** * (Typical @ 25/H11543C and VS = 15 V unless otherwise noted.) NOTES *Specifications same as AD204J. 1Nonlinearity is specified as a % deviation from a best straight line. 21.0 mF min decoupling required (see text). 33 mA with one supply loaded. 4Width is 0.25" typ, 0.26" max. Specifications subject to change without notice.

REV. D AD202/AD204 –3– AD246–SPECIFICATIONS (Typical @ 25∞C and VS = 15 V unless otherwise noted.) Model AD246JY AD246JN OUTPUTl Frequency 25 kHz Nominal * Voltage 15 V p-p Nominal * Fan-Out 32 Max * POWER SUPPLY REQUIREMENTS Input Voltage 15 V ± 5% * Supply Current Unloaded 35 mA * Each AD204 Adds 2.2 mA * Each 1 mA Load on AD204 +VISO or –VISO Adds 0.7 mA * NOTES *Specifications the same as the AD246JY. 1The high current drive output will not support a short to ground. Specifications subject to change without notice. AD246 Pin Designations Pin (Y) Pin (N) Function 11 2 15 V POWER IN

21 CLOCK OUTPUT

Package Max Common-Mode Max Model Option Voltage (Peak) Linearity AD202JY SIP 1000 V ± 0.05% AD202KY SIP 2000 V ± 0.025% AD202JN DIP 1000 V ± 0.05% AD202KN DIP 2000 V ± 0.025% AD204JY SIP 1000 V ± 0.05% AD204KY SIP 2000 V ± 0.025% AD204JN DIP 1000 V ± 0.05% AD204KN DIP 2000 V ± 0.025% CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD202/AD204 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE PIN DESIGNATIONS AD202/AD204 SIP Package Pin Function 1 +INPUT 2I N P UT/VISO COMMON 3 –INPUT 4I N P UT FEEDBACK 5– V ISO OUTPUT 6+ V ISO OUTPUT 31 15 V POWER IN (AD202 ONLY)

32 CLOCK/POWER COMMON

33 CLOCK INPUT (AD204 ONLY)

37 OUTPUT LO

38 OUTPUT HI

3 –INPUT

18 OUTPUT LO

19 OUTPUT HI

20 15 V POWER IN (AD202 ONLY)

21 CLOCK INPUT (AD204 ONLY)

22 CLOCK/POWER COMMON

37 –V ISO OUTPUT

38 INPUT FEEDBACK

cable may be required or AD204s can be used. Figure 17. A three-pole active filter is included in the design to itself; gain adjustment can be done at the feedback resistor. often useful for getting offset with a follower-type output buffer. Figure 18. Process Current Input Isolator with Offset

5 V, but if necessary that can be reduced by using a lower value

Figure 17. Input Amplifier and Filter for Sensor Signals

REV. D AD202/AD204 –11– OUTLINE DIMENSIONS Dimensions shown in inches and (millimeters) AD202/AD204 SIP Package 0.625 (15.9) MAX 0.15 (3.81) TYP 1 3 5 2 6 31 33 37 38324 0.05 (1.3)TYP 1.30 (33.0) 0.010 /H11547 0.020 0.143 (3.63) 0.12 (3.05) 0.10 (2.5) TYP 0.250 (6.3) TYP 0.260 (6.6) MAX 2.08 (52.8) MAX FRONT VIEW BOTTOM VIEWCL AD202/AD204 SIDE VIEW NOTE: PIN 31 IS PRESENT ONLY ON AD202 PIN 33 IS PRESENT ONLY ON AD204 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGNAC1058 Mating Socket 0.30 (7.62) MAX 0.24 (6.10) 0.10 (2.5) DIA BOTH ENDS 2.65 (7.30) 2.50 (63.50) 0.10 (2.50) TYP 0.075 (1.90) TYP AC1058 CAN BE USED AS A SOCKET FOR AD202,AD204 AND AD246 NOTE: AMP ZP SOCKET (PIN 2 – 382006 – 3) MAY BE USED IN PLACE OF THE AC1058 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN 0.330 (8.4) MAX 0.10 (2.5) NOM 0.625 (15.9) MAX 0.115 (2.9) SIDE VIEW 0.015 (0.38) 0.010 (0.25) 0.10 (2.5) 0.115 (2.9) CL BOTTOM VIEW 0.05 (1.30) NOM 0.10 (2.5) MIN 0.995 (25.3) MAX AD246JY FRONT VIEW 0.55 (14.0) 0.010 (0.25) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN AD202/AD204 DIP Package 1.60 (40.6) BOTTOM VIEW 38 37 36 123 22 21 20 18 19 0.700 (17.8) MAX 0.015 (0.38) 0.350 (8.9) MAX 0.018 (0.46) SQUARE 0.10 (2.5) MIN 2.100 (53.3) MAX NOTE: PIN 20 IS PRESENT ONLY ON AD202 PIN 21 IS PRESENT ONLY ON AD204 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGNAC1060 Mating Socket 2.35 (59.7) 2.60 (66.0) 0.50 (12.7) 0.10 (2.5) DIA BOTH ENDS 0.70 (17.8) 0.125 (3.1) TYP 0.30 (7.62) MAX CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN FRONT VIEW AD246JN 1.445 (36.7) MAX 0.100 (2.5) MIN 0.35 (8.9) MAX 0.020 (0.51) 0.010 (0.25) 0.145 (3.7) 0.020 (0.51) 0.015 (0.38) 1 12 1424 BOTTOM VIEW 1.10 (27.9) 1.00 (25.4) 0. 50 (12.7) 0.70 (17.8) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN

REV. D–12– C00483–0–10/02(D) PRINTED IN U.S.A. AD202/AD204

Revision History

10/02—Data Sheet changed from REV. C to REV. D. 4/01—Data Sheet changed from REV. B to REV. C.