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otherwise under any patent or patent rights of Analog Devices.
a
120 kHz Bandwidth, Low Distortion,
Isolation Amplifier
AD215
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Isolation Voltage Rating: 1,500 V rms
Wide Bandwidth: 120 kHz, Full Power (–3 dB)
Rapid Slew Rate: 6 V/ms
Fast Settling Time: 9 ms
Low Harmonic Distortion: –80 dB @ 1 kHz
Low Nonlinearity: 60.005%
Wide Output Range: 610 V, min (Buffered)
Built-in Isolated Power Supply: 615 V dc @ 610 mA
Performance Rated over –408C to +858C
APPLICATIONS INCLUDE
High Speed Data Acquisition Systems
Power Line and Transient Monitors
Multichannel Muxed Input Isolation
Waveform Recording Instrumentation
Power Supply Controls
Vibration Analysis
Flexible Input and Buffered Output Stages: An uncommit-
ted op amp is provided on the input stage of the AD215 to
allow for input buffering or amplification and signal condition-
ing. The AD215 also features a buffered output stage to drive
low impedance loads and an output voltage trim for zeroing the
output offset where needed.
High Accuracy: The AD215 has a typical nonlinearity of
±0.005% (B grade) of full-scale range and the total harmonic
distortion is typically –80 dB at 1 kHz. The AD215 provides
designers with complete isolation of the desired signal without
loss of signal integrity or quality.
Excellent Common-Mode Performance: The AD215BY
(AD215AY) provides 1,500 V rms (750 V rms) common-mode
voltage protection from its input to output. Both grades feature
a low common-mode capacitance of 4.5 pF inclusive of the
dc/dc power isolation. This results in a typical common-mode
rejection specification of 105 dB and a low leakage current of
2.0 µA rms max (240 V rms, 60 Hz).
Isolated Power: An unregulated isolated power supply of
±15 V dc @ ±10 mA is available at the isolated input port of
the AD215. This permits the use of ancillary isolated front-end
amplifiers or signal conditioning components without the need
for a separate dc/dc supply. Even the excitation of transducers
can be accomplished in most applications.
Rated Performance over the –408C to +858C Temperature
Range: With an extended industrial temperature range rating,
the AD215 is an ideal isolation solution for use in many indus-
trial environments.
GENERAL DESCRIPTION
The AD215 is a high speed input isolation amplifier designed to
isolate and amplify wide bandwidth analog signals. The innova-
tive circuit and transformer design of the AD215 ensures wide-
band dynamic characteristics while preserving key dc performance
specifications.
The AD215 provides complete galvanic isolation between the
input and output of the device including the user-available
front-end isolated power supplies. The functionally complete
design, powered by a ±15 V dc supply, eliminates the need for a
user supplied isolated dc/dc converter. This permits the designer
to minimize circuit overhead and reduce overall system design
complexity and component costs.
The design of the AD215 emphasizes maximum flexibility and
ease of use in a broad range of applications where fast analog
signals must be measured under high common-mode voltage
(CMV) conditions. The AD215 has a ±10 V input/output
range, a specified gain range of 1 V/V to 10 V/V, a buffered out-
put with offset trim and a user-available isolated front-end
power supply which produces ±15 V dc at ±10 mA.
PRODUCT HIGHLIGHTS
High Speed Dynamic Characteristics: The AD215 features
a typical full-power bandwidth of 120 kHz (100 kHz min), rise
time of 3 µs and settling time of 9 µs. The high speed perfor-
mance of the AD215 allows for unsurpassed galvanic isolation
of virtually any wideband dynamic signal.
OUT HI
TRIM
OUT LO
+15V
IN
–15V
IN
PWR RTN
FB
IN–
IN+
IN COM
+V
ISO
–V
ISO
1
3
MODULATOR
37
36
38
42
44
43
6
2
5
4
UNCOMMITTED
INPUT OP AMP
RR
OUTPUT
BUFFER
33kΩ
0.01µF
DEMODULATOR
LOW-PASS
FILTER
150kHz
POWER
ISOLATED
DC
SUPPLY
430kHz
POWER
OSCILLATOR
T1
T2
AD215
SIGNAL
