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AD202

Low Cost / Miniature Isolation Amplifiers



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AD202 pdf
a
Low Cost, Miniature
Isolation Amplifiers
AD202/AD204
FEATURES
Small Size: 4 Channels/lnch
Low Power: 35 mW (AD204)
High Accuracy: ؎0.025% Max Nonlinearity (K Grade)
High CMR: 130 dB (Gain = 100 V/V)
Wide Bandwidth: 5 kHz Full-Power (AD204)
High CMV Isolation: ؎2000 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
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002



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AD202 pdf
AD202/AD204–SPECIFICATIONS(Typical @ 25؇C and VS = 15 V unless otherwise noted.)
Model
GAIN
Range
Error
vs. Temperature
vs. Time
vs. Supply Voltage
Nonlinearity (G = 1 V/V)1
Nonlinearity vs. Isolated Supply Load
INPUT VOLTAGE RATINGS
Input Voltage Range
Max lsolation Voltage (Input to Output)
AC, 60 Hz, Continuous
Continuous (AC and DC)
Isolation-Mode Rejection Ratio (IMRR) @ 60 Hz
RS £ 100 W (HI and LO Inputs) G = 1 V/V
G = 100 V/V
RS £ l kW (Input HI, LO, or Both) G = 1 V/V
G = 100 V/V
Leakage Current Input to Output @ 240 V rms, 60 Hz
INPUT IMPEDANCE
Differential (G = 1 V/V)
Common-Mode
INPUT BIAS CURRENT
Initial, @ 25C
vs. Temperature (0C to 70C)
INPUT DIFFERENCE CURRENT
Initial, @ 25C
vs. Temperature (0C to 70C)
INPUT NOISE
Voltage, 0.1 Hz to 100 Hz
f > 200 Hz
FREQUENCY RESPONSE
Bandwidth (VO £ 10 V p-p, G = 1 V–50 V/V)
Settling Time, to ± 10 mV (10 V Step)
OFFSET VOLTAGE (RTI)
Initial, @ 25C Adjustable to Zero
vs. Temperature (0C to 70C)
RATED OUTPUT
Voltage (Out HI to Out LO)
Voltage at Out HI or Out LO (Ref. Pin 32)
Output Resistance
Output Ripple, 100 kHz Bandwidth
5 kHz Bandwidth
ISOLATED POWER OUTPUT2
Voltage, No Load
Accuracy
Current
Regulation, No Load to Full Load
Ripple
OSCILLATOR DRIVE INPUT
Input Voltage
Input Frequency
POWER SUPPLY (AD202 Only)
Voltage, Rated Performance
Voltage, Operating
Current, No Load (VS = 15 V)
TEMPERATURE RANGE
Rated Performance
Operating
Storage
PACKAGE DIMENSIONS4
SIP Package (Y)
DlP Package (N)
AD204J
AD204K
AD202J
AD202K
1 V/V–100 V/V
± 0.5% typ (± 4% max)
± 20 ppm/C typ (± 45 ppm/C max)
± 50 ppm/1000 Hours
± 0.01%/V
± 0.05% max
± 0.0015%/mA
*
*
*
*
± 0.01%/V
± 0.025% max
*
±5 V
750 V rms
± 1000 V Peak
110 dB
130 dB
104 dB min
110 dB min
2 mA rms max
*
1500 V rms
± 2000 V Peak
110 dB
*
104 dB min
*
*
1012 W
2 GWʈ4.5 pF
*
*
± 30 pA
± 10 nA
*
*
± 5 pA
± 2 nA
*
*
4 mV p-p
50 nV/÷Hz
*
*
*
*
*
*
± 0.01%/V
± 0.05% max
*
*
750 V rms
± 1000 V Peak
105 dB
*
100 dB min
*
*
*
*
*
*
*
*
*
*
*
*
*
*
± 0.01%/V
± 0.025% max
*
*
1500 V rms
± 2000 V Peak
105 dB
*
100 dB min
*
*
*
*
*
*
*
*
*
*
5 kHz
1 ms
5 kHz
*
2 kHz
*
2 kHz
*
(± 15 ± 15/G)mV max
Ê
ËÁ
±10
±
10
G
ˆ
¯˜
mV
C
(± 5 ± 5/G) mV max
*
(± 15 ± 15/G) mV max (± 5 ± 5/G) mV max
**
±5 V
± 6.5 V
3 kW
10 mV p-p
0.5 mV rms
*
*
3 kW
*
*
*
*
7 kW
*
*
*
*
7 kW
*
*
± 7.5 V
± 10%
2 mA (Either Output)3
5%
100 mV p-p
*
*
2 mA (Either Output)3
*
*
*
*
400 mA Total
*
*
*
*
400 mA Total
*
*
15 V p-p Nominal
25 kHz Nominal
15 V p-p Nominal
25 kHz Nominal
N/A
N/A
N/A
N/A
N/A
N/A
15 V ± 5%
15 V ± 5%
N/A
N/A
15 V ± 10%
15 V ± 10%
N/A
N/A
5 mA
5 mA
0C to 70C
–40C to +85C
–40C to +85C
2.08" ¥ 0.250" ¥ 0.625"
2.10" ¥ 0.700" ¥ 0.350"
*
*
*
*
*
**
**
**
**
**
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.
–2– REV. D



Part Number AD202
Description Low Cost / Miniature Isolation Amplifiers
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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