AD294_15 Datasheet, PDF (1/8 Pages) Analog Devices – Hybrid Industrial Medical Isolation Amplifier

-. ANALOG
W DEVICES
HybridIndustrial/
MedicalIsolationAmplifier
I
FEATURES
High Common-Mode Voltage:
AD293 :!:2500V peak max, cont.
AD294 :!:3500 peak max, cont.; :!:8000V peak
max Pulse
AD293/AD294I
AD293/AD294 FUNCTIONAL BLOCK DIAGRAM
AD293/AD294
INPUT
T1
OUTPUT
.
Nonlinearity: :!:0.05% max (AD293B)
Adjustable Input & Output Gain: 1VN to 1000VN
Meets UL Std 544 Leakage: 2.0fJ.Amax @ 115V ac,
OBSOLETE 60Hz
APPLICATIONS
Off Ground Signal Measurement
Industrial Control
Nuclear Instrumentation
High Voltage Protection for Data Acquisition Systems
Medical Diagnostic and Patient Monitoring Equipment
GENERAL DESCRIPTION
The AD293/AD294 are low cost, high performance isolation
amplifiers designed for accurate processing of low level,
industrial sensor or biomedical signals, with true galvanic
isolation from high common-mode voltages, transients and lethal
ground fault currents. The true hybrid architecture of the
AD293/AD294 includes a proprietary hybrid magnetic trans-
former, all housed in a low profile (0.3") epoxy sealed, .40-pin
-1JV
\-"
WHERE TO USE THE AD293/AD294
Industrial: In process control systems, high CMV instrumentation
and multi-channel computer interface systems, the AD293/AD294
provide guaranteed protection against high transient voltages,
lethal ground fault currents and high common-mode voltages.
Medical: In biomedical and patient monitoring equipment such
as ECG recorders, diagnostic systems and blood pressure
monitors, the AD294A offers protection from lethal ground
ceramic package.
fault currents as well as 8kV peak defibrillator pulse inputs.
The AD293 features a maximum nonlinearity of 0.1 % (AD293A)
or 0.05% (AD293B) and maximum common-mode voltage
isolation of either 2500V peak (continuous ac or dc) or 2500V
rms (ac 60Hz, I minute). The AD294A provides a maximum
Low level signal recording and monitoring is achieved with the
AD294A's low input noise (l°J.LV Pop (((1G = 1O0VIV) high
CMR (lOOdB min (ill 60Hz).
nonlinearity of 0.1% and maximum common-mode voltage
DESIGN FEATURES AND USER BENEFITS
isolation of 3500V peak (continuous ac, dc) and common-mode
voltage pulse (defibrillator) or transient protection of :t 8000V
peak.
Adjustable Gain: Gain can be selected at dther the input,
output, or both. Thus, circuit response can be tailored to the
user's application. The input gain can be selected from IVIV to
In medical applications requiring patient isolation from lethal
ground fault currents, the AD293/AD294 meet UL STD 544
leakage requirements by guaranteeing a maximum leakage
current of 2J.LArms (1l5V, 60Hz).
1O0VN with a single resistor. The output gain can be selected
from IVN to IOVN with or without compensation. The
AD293/AD294 provides the user with flexibility for circuit
optimization without requiring external active components.
All versions provide small signal ( - 3dB) frequency response of
2.5kHz and a full power response of 200Hz (at gain of IVIV).
Both the input and output sections of the AD293/AD294 are
gain programmable, allowing the user to tailor the amplifier to
meet an application requirement.
Buffered Output: The AD293/AD294 prevent inaccuracies
related to low impedance loads by providing an uncommitted
output amplifier capable of supplying :t IOV (ll SmA min.
---
--