Low Cost, Miniature a Isolation Amplifiers AD202/AD204 FEATURES PRODUCT HIGHLIGHTS Small Size: 4 Channels/lnch The AD202 and AD204 are full-featured isolators offering Low Power: 35 mW (AD204) numerous benefits to the user: High Accuracy: 0.025% Max Nonlinearity (K Grade) Small Size: The AD202 and AD204 are available in SIP and High CMR: 130 dB (Gain = 100 V/V) DIP form packages. The SIP package is just 0.25 wide, giving Wide Bandwidth: 5 kHz Full-Power (AD204) the user a channel density of four channels per inch. The isolation High CMV Isolation: 2000 V pk Continuous (K Grade) barrier is positioned to maximize input to output spacing. For (Signal and Power) applications requiring a low profile, the DIP package provides a Isolated Power Outputs height of just 0.350 . Uncommitted Input Amplifier High Accuracy: With a maximum nonlinearity of 0.025% APPLICATIONS for the AD202K/AD204K (0.05% for the AD202J/AD204J) Multichannel Data Acquisition and low drift over temperature, the AD202 and AD204 provide Current Shunt Measurements high isolation without loss of signal integrity. Motor Controls Low Power: Power consumption of 35 mW (AD204) and Process Signal Isolation 75 mW (AD202) over the full signal range makes these isolators High Voltage Instrumentation Amplifier ideal for use in applications with large channel counts or tight power budgets. GENERAL DESCRIPTION The AD202 and AD204 are general purpose, two-port, trans- Wide Bandwidth: The AD204s full-power bandwidth of 5 kHz former-coupled isolation amplifiers that may be used in a broad makes it useful for wideband signals. It is also effective in appli- range of applications where input signals must be measured, cations like control loops, where limited bandwidth could result processed, and/or transmitted without a galvanic connection. in instability. These industry standard isolation amplifiers offer a complete Excellent Common-Mode Performance: The AD202K/ isolation function, with both signal and power isolation provided AD204K provide 2000 V pk continuous common-mode isola- for in a single compact plastic SIP or DIP style package. The tion, while the AD202J/AD204J provide 1000 V pk continuous primary distinction between the AD202 and the AD204 is that common-mode isolation. All models have a total common-mode the AD202 is powered directly from a 15 V dc supply while the input capacitance of less than 5 pF inclusive of power isolation. AD204 is powered by an externally supplied clock, such as the This results in CMR ranging from 130 dB at a gain of 100 dB to recommended AD246 Clock Driver. 104 dB (minimum at unity gain) and very low leakage current The AD202 and AD204 provide total galvanic isolation between (2 mA maximum). the input and output stages of the isolation amplifier through Flexible Input: An uncommitted op amp is provided at the the use of internal transformer-coupling. The functionally com- input of all models. This provides buffering and gain as required, plete AD202 and AD204 eliminate the need for an external, and facilitates many alternative input functions including filtering, user-supplied dc-to-dc converter. This permits the designer summing, high voltage ranges, and current (transimpedance) input. to minimize the necessary circuit overhead and consequently reduce the overall design and component costs. Isolated Power: The AD204 can supply isolated power of 7.5 V at 2 mA. This is sufficient to operate a low-drift input The design of the AD202 and AD204 emphasizes maximum preamp, provide excitation to a semiconductor strain gage, or flexibility and ease of use, including the availability of an power any of a wide range of user-supplied ancillary circuits. uncommitted op amp on the input stage. They feature a bipolar The AD202 can supply 7.5 V at 0.4 mA, which is sufficient to 5 V output range, an adjustable gain range of from 1V/V to operate adjustment networks or low power references and op 100 V/V, 0.025% max nonlinearity (K grade), 130 dB of amps, or to provide an open-input alarm. CMR, and the AD204 consumes a low 35 mW of power. The functional block diagrams can be seen in Figures 1a and 1b. REV. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties that Tel: 781/329-4700 www.analog.com may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781/326-8703 Analog Devices, Inc., 2002(Typical 25 C and V = 15 V unless otherwise noted.) AD202/AD204SPECIFICATIONS S Model AD204J AD204K AD202J AD202K GAIN Range 1 V/V100 V/V ** * Error 0.5% typ (4% max) ** * vs. Temperature 20 ppm/ C typ (45 ppm/ C max)** * vs. Time 50 ppm/1000 Hours ** * vs. Supply Voltage 0.01%/V 0.01%/V 0.01%/V 0.01%/V 1 Nonlinearity (G = 1 V/V) 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 R 100 W (HI and LO Inputs) G = 1 V/V 110 dB 110 dB 105 dB 105 dB S G = 100 V/V 130 dB ** * R l kW (Input HI, LO, or Both) G = 1 V/V 104 dB min 104 dB min 100 dB min 100 dB min S G = 100 V/V 110 dB min ** * Leakage Current Input to Output 240 V rms, 60 Hz 2 mA rms max ** * INPUT IMPEDANCE 12 Differential (G = 1 V/V) 10 W ** * Common-Mode 2 GW 4.5 pF ** * INPUT BIAS CURRENT Initial, 25 C 30 pA ** * vs. Temperature (0 C to 70 C) 10 nA ** * INPUT DIFFERENCE CURRENT Initial, 25 C 5 pA ** * 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 10 V p-p, G = 1 V50 V/V) 5 kHz 5 kHz 2 kHz 2 kHz O 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 10 10 mVC vs. Temperature (0 C to 70 C) ** * G 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 kW 3 kW 7 kW 7 kW Output Ripple, 100 kHz Bandwidth 10 mV p-p ** * 5 kHz Bandwidth 0.5 mV rms ** * 2 ISOLATED POWER OUTPUT Voltage, No Load 7.5 V ** * Accuracy 10% ** * 3 3 Current 2 mA (Either Output) 2 mA (Either Output) 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 = 15 V) N/A N/A 5 mA 5 mA S TEMPERATURE RANGE Rated Performance 0 C to 70 C ** * Operating 40 C to +85 C ** * Storage 40 C to +85 C ** * 4 PACKAGE DIMENSIONS SIP Package (Y) 2.08 0.250 0.625 ** * DlP Package (N) 2.10 0.700 0.350 ** * 3 NOTES 3 mA with one supply loaded. 4 *Specifications same as AD204J. Width is 0.25 typ, 0.26 max. 1 Nonlinearity is specified as a % deviation from a best straight line. Specifications subject to change without notice. 2 1.0 mF min decoupling required (see text). 2 REV. D