FEATURES

High CMV Isolation: ±5000V pk, 10ms Pulse; ±2500V dc

Continuous

High CMR: 110dB min with 5k

Ω imbalance

Low Nonlinearity: 0.05% @ 10V pk-pk Output

High Gain Stability: ±0.0075%/

°C, ±0.001%/1000 hours

Low Input Offset Voltage Drift: 10

µV/ °C, G = 100V/V

(Model 286J)

Resistor Programmed Gain: 1 to 10V/V (284J)

1 to 100V/V (286J)

Isolated Power Supply: ±8.5V dc @ ±5mA (284J)

±15V dc @ ±15mA (286J)

Meets IEEE Std 472: Transient Protection (SWC)

Meets UL Std 544 Leakage @ 115V ac, 60Hz:

2.0

µA max (284J)

2.5

µA max (286J)

APPLICATIONS

Fetal Heartbeat Monitoring

Multi-Channel ECG Recording

Ground Loop Elimination in Industrial and Process

Control High Voltage Protection in Data Acquisition

Systems 4-20mA Isolated Current Loop Receiver

GENERAL DESCRIPTION

The models 284J, 286J are low cost, high performance isolation

amplifiers designed for high CMV isolation and low leakage in

biomedical, industrial and data acquisition systems. Using modulation

techniques with reliable transformer isolation, the models 284J, 286J

protect both patients and ultrasensitive equipment from high CMV

transients up to ±5000V pk (10ms pulse) or 2500V dc continuous, high

CMR of ll0dB (5k

Ω imbalance) and feature maximum leakage current

of less than 3

µA rms, @ 115V ac, 60Hz (inputs to power common).

The model 284J is a self-contained isolation amplifier for single

channel applications. For multi-channel applications, the model 286J

combined with an external synchronizing oscillator such as the model

281 may be used; up to 16 model 286J amplifiers can be driven from 1

model 281 oscillator. Additional channels may be obtained by

configuring an unlimited number of 284Js with several ganged 281

oscillators.

Both models also provide resistor-programmable gain of 1 to 10V/V

(284J) or 1 to 100V/V (286J), high gain stability of 0.0075%/

°C, low

nonlinearity of 0.05% @ 10V pk-pk output and isolated power supply

outputs of ±15V dc @ ±15mA (286J) or ±8.5V dc @ ±5mA (284J).

WHERE TO USE MODELS 284J, 286J

Industrial Applications: In data acquisition systems, computer

interface systems, process signal isolators and high CMV

instrumentation, models 284J, 286J offer complete galvanic isolation

and protection against damage from transients and fault voltages. High

level transducer interface capability is afforded

Information furnished by Intronics is believed to be accurate and reliable. However, no

responsibility is assumed by Intronics for its use; nor for any infringements of patents or

other rights of third parties which may result from its use. No license is granted by

implication or otherwise under any patent or patent rights of Intronics.

4 CHANNEL. ISOLATED DATA ACQUISITION SYSTEM

with model 286J's 20V pk-pk or model 284J's 10V pk-pk input signal

range at a gain of 1V/V operation. In portable field designs, single

supply, wide range operation (+8V to +16V) offers simple battery

operation.

Medical Applications: In biomedical and patient monitoring

equipment such as multi-channel VCG, ECG, and polygraph

recorders, models 284J, 286J offer protection from lethal ground

fault currents as well as 5kV defibrillator pulse inputs. Low level

bioelectric signal recording is achieved with low input noise (8

µV

pk-pk @ G = max gain) and high CMR (110dB, min @ 60Hz).

DESIGN FEATURES AND USER BENEFITS

High Reliability: Models 284J, 286J are conservatively designed,

compact modules, capable of reliable operation in harsh

environments. Models 284J, 286J have calculated MTBF of over

390,000 hours and are designed to meet MIL-STD-202E

environmental testing as well as the IEEE Standard for Transient

Voltage Protection (472-1974: Surge Withstand Capability).

Isolated Power Supply: Dual regulated supplies, completely

isolated from the input power terminals (±2500V dc isolation),

provides the capability to excite floating signal conditioners, front

end buffer amplifiers as well as remote transducers such as

thermistors or bridges.

Adjustable Gain: A single external resistor enables gain adjustment

from 1V/V to 100V/V (286J) or 1V/V to 10V/V (284J) providing the

flexibility of applying models 284J, 286J in both high level

transducer interfacing as well as low level sensor measurements.

1400 Providence Highway, Building #2

Norwood, MA 02062

Phone (781) 551-5500

FAX (781) 551-5555

www.intronicspower.com

High CMV, High Performance

Isolation Amplifiers

Models 284J, 286J, 281