AD203SN ,Rugged, Military Temperature Range, 10 kHz Bandwidth Isolation AmplifierSPECIFICATIONS (typical @ +NT, ll, = +15 ll d/ses, 5therwise noted)
GAIN
Range
Error
vs. Temp ..
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AD203SN
Rugged, Military Temperature Range, 10 kHz Bandwidth Isolation Amplifier
ANALOG
DEVICES
Rugged, Military Temperature Range,
lil kHz Bandwidth Isolation Amplifier
AD203SN
FEATURES
Rugged Design: Meets Stringent MlL-STD-883C
Environmental Test Methods
1004 (Moisture Resistance)
1010 Condition B (Temperature Cycling,
-55oC to +125°C)
2002 Condition B (Mechanical Shock Ct 1,500 g
for 0.5 ms)
2004 (Lead Integrity)
2007 Condition A (Variable Frequency Vibration
a 20 gl
2015 (Resistance to Solvents)
Reliable Design: Conforms to Stringent Quality and
Reliability Standards
Characterized to the Full Military Temperature Range
--55oC to +125°C Rated Performance
10 kHz Full Power Bandwidth
Low Nonlinearity: 1-0.025% max
Wide Output Range: :10 V min (Into a 2.5 kn Load)
High CMV Isolation: 1500 V RMS Continuous
Isolated Power: " V DC Cr) :5 mA
Small Size: 2.23”x0.83"x0.65"
56.6 mmx21.1 mmx16.5 mm
Uncommitted Input Amplifier
Two-Port Isolation Through Transformer Coupling
ISOLATION AMPLIFIERS
Provide Galvanic Isolation Between the Input and
Output Stages
Eliminate Ground Loops
Reiect High Common Mode Voltages and Noise
Protect Sensitive Electronic Signal Processing Systems
from Transient and/or Fault Voltages
APPLICATIONS INCLUDE
Engine Monitoring and Control
Mobile Multichannel Data Acquisition Systems
Instrumentation and/or Control Signal Isolation
Current Shunt Measurements
High Voltage Instrumentation Amplifier
GENERAL DESCRIPTION
The AD203SN is designed and built expressly for use in hostile
operating environments. The AD203SN is also an integral mem-
ber of Analog Devices' AD200 Series of low cost, high perfor-
mance, transformer coupled isolation amplifiers. Technological
innovations in circuit design, transformer construction, surface
mount components and assembly automation have resulted in a
rugged, economical, military temperature range isolator that
either retains or improves upon the key performance specifica-
tions of the AD202/AD204 line.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAM
SIGNAL AD203SN
UNCOMMITTED , t -
INPUT DP AMP
12 kHz
LP FILTER our
MODULATOR DEM0DULATOR = aouwur 9 HI
BUFFER
7—1 Kiwis:
V.sc.+ y OSCILLATOR
ISOLATED ) g C]
35 km r
INPUT 'oRr--1 _ OUTPUT PORT
SUPPLY
The AD203SN provides total galvanic isolation between the in-
put and output stages of the isolation amplifier, including the
power supplies, through the use of internal transformer cou-
pling. The functionally complete design of the AD203SN, pow-
ered by a single + 15 V dc supply, eliminates the need for an
external dc/dc converter. This permits the designer to minimize
the necessary circuit overhead and consequently reduce the over-
all design and component costs. Furthermore, the power con-
sumption, nonlinearity and drift characteristics of transformer
coupled devices are vastly superior to those achievable with
other isolation technologies, without sacrificing bandwidth or
noise performance. Finally, the AD203SN will maintain its high
operating performance even under sustained common mode
stress.
The design of the AD203SN emphasizes maximum flexibility
and ease of use in a broad range of applications where signals
must be measured or transmitted under high CMV conditions.
The AD203SN has a :10 V output range, an uncommitted in-
put amplifier, an output buffer, a 10 kHz full power bandwidth
and a front-end isolated power supply of i 15 V dc Cd t5 mA.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Tel: 617/329-4700 Fax: 617/326-8703 wa: 710/394-6577
West Coast Central Atlantic
714/641-9391 214/231-5094 215/643-7790
ADZU3SN -SPEtlFltWl0lG (pm @ +25'T, lls = +15 If d/a,,, otherwise Mted)
vs. Temperature1
--55''C to +125°C
--550C to +25°C
-40°C to +25°C
-25c'C to +25°C
+25°C to +125°C
vs. Time
vs. Supply Voltage
Nonlinearity', G=1 WV, t10 V Output Swing
1 V/V-loo WV
tl% typ (i4% max)
50 ppml°C
100 ppml°C
80 ppm/°C
60 ppm/Y:
5 ppm/°C
:50 ppm/ 1000 hours
:0.005%/V
:0.012% (:0.025% max)
INPUT VOLTAGE RATINGS
Linear Differential Range
Max CMV Input to Output
AC, 60 Hz, Continuous
Continuous (ac and dc)
Common Mode Rejection (CMR) @ 60 Hz
RS 3 100 ft (HI & LO Inputs), G = 1 WV
G = 100 V/V
RS 5 1 kn (Input, HI, LO or Both), G = 1-100 V/V
Leakage Current, Input to Output @ 240 V rms, 60 Hz
1500 V rms
t2000 V peak
96dB (min)
4.OWA rms (max)
INPUT IMPEDANCE
Differential (G = 1 WV) 1012 n
Common Mode 2 Gnil4.5 pF
INPUT BIAS CURRENT
Initial @ +25°C 30 pA
Current Ci) + 125°C 30 nA
INPUT DIFFERENCE CURRENT
Initial @ +25°C :5 pA
Current (ij) +125°C t5 nA
INPUT NOISE
Voltage, 0.1 Hz to 100 Hz 4 wV p-p
Voltage, Frequency > 200 Hz 50 nV/V Hz
FREQUENCY RESPONSE
Bandwidth (VOUT S 20 V p-p, G = 1-100 WV) 10 kHz
Slew Rate 0 5 V/ws
Settling Time to :0.10% 160 ps
OFFSET VOLTAGE, REFERRED TO INPUT (RTI)
Initial Ca +25°C (Adjustable to Zero)
vs. Temperature (--55''C to + 125°C)
5 + 25/G) mV (max)
6 + 100/G) p.NIt
RATED OUTPUT3
Voltage (Out HI to Out LO) @ RL = 5.0 kfl i 10 V (min)
Current t4 mA
Maximum Capacitive Load4 270 pF
Output Resistance 0.2 n
Output Ripple, 100 kHz Bandwidth 15 mV p-p
5 kHz Bandwidth 0.7 mV rms
ISOLATED POWER OUTPUTS
Voltage, No Load t15 V
Accuracy 15%
Current (Either Output) 5 mA
Regulation, No Load to Full Load 5%
Ripple, 100 kHz Bandwidth, Full Load 110 mV p-p
POWER SUPPLY
Voltage, Rated Performance
Voltage, Operating Performances
Current, No Load (VS = + 15 V dc)
+15 V dc (t5%)
+12 Vdc to +16V dc
REV. A
TEMPERATURE RANGE
Rated Performance
Storage
PACKAGE DIMENSIONS
Inches
-55T to +125°C
-55''C to +125°C
2.23 x 0.83 X 0.65
Millimeters 56.6,x 21.1 X 16 S
PRICES
1-24 $93
100s $58
1Refer to Figure l for a plot of gain versus temperature.
2For gains greater than 50 V/V, a 100 pF capacitor from the feedback terminal of the input op amp (Pin 38) to the input common terminal (Pin 2) is
recommended in order to minimize the gain nonlinearity. Refer to Figure 17 for a circuit schematic.
3For additional information on the Rated Output parameters, refer to Figure 9 for a plot of the Output Voltage Swing vs. Power Supply Voltage, and
Figure 10 for the Output Current vs. Temperature and Power Supply Voltage relationship.
'For larger capacitive loads, it is recommended that a 4.7 ft resistor be placed in series with the load in order to suppress possible output oscillations.
51.0 wF (min) decoupling is required.
'Refer to Figure 9 for a plot of output voltage swing versus supply voltage.
Specifications subject to change without notice.
0.15 (3.8)
--1 i-o., (2.S) TYP
0.60 (15.2)
AC1062 MATING SOCKET
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
i-- 2.23 (56.6) MAX --------1
AD203SN
SIDE VIEW
0.65 (16.5)
llllll
-A--- 0.018 (OAS) SO
BOTTOM VIEW "itlrm
1.6 (40.6) ------/
0.215 (5.5)
AD203SN
AD203SN PIN DESIGNATIONS
2.25 (57.2) "llUdl
15., 138.1) PIN DESIGNATION FUNCTION PORT
(- 1 lN+ INPUT OP AMP: NONINVERTING INPUT INPUT
2 IN COM INPUT COMMON INPUT
-l-oyo _ - - oil-. I 3 IN- INPUT OP AMP: INVERTING INPUT INPUT
I 18 OUT RTN OUTPUT RETURN OUTPUT
l I 19 OUT HI OUTPUT SIGNAL OUTPUT
20 PWR IN no POWER SUPPLY INPUT OUTPUT
- Ci) _— - - - C.600 y,'g 21 NONE NONE -
Wi.2) l . l 22 PWR COM Dc POWER SUPPLY COMMON OUTPUT
I I as Ihso+ ISOLATED POWER: +oc INPUT
-°- o -o - --.-.._ - - - o- I'- 37 .so- ISOLATED POWER: -Dc INPUT
' I as FB INPUT OP AMP: OUTPUTIFEEDBACK INPUT
0.125 TYP -ol I---
thT00 Wii) DIA. CIS TO (3.2)
OA80 (4.6) DIA. TYP
2 PLACES
CAUTION
ESD (electrostatic discharge) sensitive device. Permanent damage may occur on unconnected
devices subject to high energy electrostatic fields. Unused devices must be discharged to the
destination socket before devices are removed.
Note: Per MIL-STD-883C, Method 3015, this device have been classified as a Category 2 ESD
sensitive device.
_'iiiii'i 2iDtiSMiimlBaglrlili,
REV. A
PRODUCT HIGHLIGHTS
Rugged Design. The AD203SN is specifically designed for
applications where ruggedness and high performance are the key
requirements. The ruggedness of the AD203SN design meets
MIL-STD-883C Methods 1004 (Moisture Resistance), 1010
Condition B (Temperature Cycling, -55°C to +125°C), 2002
Condition B (Mechanical Shock (ril 1,500 g for 0.5 ms), 2004
(Lead Integrity), 2007 Condition A (Variable Frequency Vibra-
tion Ct 20 g) and 2015 (Resistance to Solvents).
Engine and vehicular monitor/control systems as well as mobile
instrumentation and control systems are some examples of appli-
cations for which the AD203SN is well suited.
Military Temperature Range Rating. With its performance
rated over the -5Y'C to + 125°C MIL specification temperature
range, the AD203SN is an excellent choice in applications where
severe environmental conditions may be encountered. Examples
include engine monitoring/control systems and remote power
line monitoring.
10 kHz Bandwidth. With a full power bandwidth of 10 kHz,
the AD203SN is effective in control loop applications where a
smaller bandwidth could induce control system instabilities.
Excellent Common Mode Performance. The AD203SN pro-
vides a 1.5 kV rms continuous common mode isolation. A low
common mode input capacitance of 4.5 pF, inclusive of power
isolation, results in a minimum 96 dB of CMR as well as a very
low leakage current of 4.0 " rms (max (d 240 V rms, 60 Hz).
High Accuracy. Exhibiting a maximum nonlinearity of
t0.025% and a low gain temperature coefficient, averaging
50 ppm/°C over the full temperature range, the AD203SN pro-
vides high isolation without loss of signal integrity and quality.
Isolated Power. An isolated power supply capable of deliver-
ing t15 V dc Cir t5 mA is available at the input port of the
isolator. This permits the AD203SN to power up floating signal
conditioners, front-end amplifiers or remote transducers at the
Input.
Flexible Input Stage. An uncommitted op amp is provided on
the input stage. This amplifier provides input buffering and gain
as needed, It also facilitates a host of alternative input functions
including filtering, summing, high voltage ranges and current
(transimpedance) inputs.
DESCRIPTION OF KEY SPECIFICATIONS
Gain Nonlinearity. Nonlinearity is defined as the peak devia-
tion of the output voltage from the best straight line and is ex-
pressed as a percent of peak-to-peak output voltage span. The
nonlinearity of the model AD203SN, which operates at a 20 V
p-p output span, is :0.025% or t5 mV. Good nonlinearity is
critical for retaining signal fidelity.
Max CMV, Input to Output. Maximum common mode volt-
age (CMV) describes the amount of voltage that may be applied
across both input terminals with respect to the output terminals
without degrading the integrity of the isolation barrier. High
input-to-output CMV capability is necessary in applications
where high CMV inputs exist or high voltage transients may
occur at the input.
Common Mode Rejection (CMR). CMR describes the isola-
tor's ability to reject common mode voltages that may exist be-
tween the inputs and the outputs. High CMR is required when
it is necessary to process small signals riding on high common
mode voltages.
Leakage Current. This is the current that flows from the in-
put common across the isolation barrier to the output common
when the power-line voltage (either 115 V or 240 V rms, 60 Hz)
is impressed on the inputs. Leakage current is dependent on the
magnitude of the coupling capacitance between the input and
the output ports. Line frequency leakage current levels are unaf-
fected by the power ON or OF F condition of the AD203SN.
Common Mode Input Impedance. This is defined to be the
impedance seen across either input terminal (i.e., +IN or -IN)
and the input common.
Input Noise. This specification characterizes the voltage noise
levels that are generated internally by the isolation amplifier. In
order to facilitate a comparison between the "isolator back-
ground noise" levels and the expected input signal levels the
input noise parameter is referred to the input.
Input noise is a function of the noise bandwidth, i.e., the fre-
quency range over which the noise characteristics are measured.
Offset Voltage, Referred to Input (RTI). The offset voltage
describes the isolation amplifier's total dc offset voltage with the
inputs grounded. The offset voltage is referred to the input in
order to allow for a comparison of the dc offset voltages with the
expected input signal levels. The total offset comes from two
sources, namely from the input and output stages, and is gain
dependent. To compute the offset voltage, RTI, the isolator is
modelled as two cascaded amplifier stages. The input stage has a
variable gain G while the output isolation stage has a fixed gain
of l. RTI offset is then given by:
Eos (RTI) = Eos, + EOSZ/G
where:
E051 = Total input stage offset voltage
Eos, = Output stage offset voltage
G = Input stage gain.
Offset voltage drift, RTI, is calculated in an identical manner.
Isolated Power Output. Dual supply voltages, completely
isolated from the input power supply terminals, provide the
capability to excite floating input signal conditioners as well as
remote transducers.
-4- REV. A
A0llil3Sli
PERFORMANCE CHARACTERISTICS
This section details the key specifications of the AD203SN that
exhibit a functional dependence on such variables as frequency,
power supply load, output voltage swing, bypass capacitance
and temperature. Table I summarizes the performance charac-
teristics that will be discussed in this section. For the sake of
completeness, a typical dynamic output response of the
AD203SN is included.
Gain Temperature Coefficient. Figure 1 presents the
AD203SN's gain temperature coefficient over the entire --55T
to + 125°C temperature range.
GAIN — ppm
-55 -40 -25 0 +25 +85 +125
TEMPERATURE - "C
Figure 1. Gain (ppm of Span) vs. Temperature (°C)
Note: 1 ppm (part per million) is equivalent to 0.0001%.
Gain Nonlinearity. The maximum nonlinearity error of the
AD203SN, at a gain of 1 WV, is specified as t0.025% or
:5 mV. The nonlinearity performance of the AD203SN is de-
pendent on the output voltage swing and this dependency is il-
lustrated in Figure 2. The horizontal axis represents the gain
error, expressed either in percent of peak-to-peak output span
(i.e., % of 20 V) on the left axis or in mV on the right axis. The
vertical axis indicates the magnitude of the output voltage
swing.
+0.02 +4
is, + . +2 >
I 001 E
m o Illl III!“ Ill 0 J,
m-0.01 -2
-0.02 -4
-10 -8 -6 -4 -2 0 +2 +4 +6 +8 +10
OUTPUT VOLTAGE SWING - V
Figure 2. Gain Nonlinearity Error (% p-p Output Range
and mV) VS. Output Voltage Swing (V), with a Gain of
. Parameter Key Specifications As a Function of Shown In
Gain Gain (ppm of Span) Temperature (°C) Figure 1
Gain Nonlinearity (Expressed in mV Output Voltage Swing (V) Figure 2
and % of p-p Output)
Input Voltage Rating Common Mode Rejection (dB) Common Mode Signal Frequency Figure 3
(Hz), Amplifier Gain (V/V) and
Input Source Resistance (O)
Input Noise Input Noise (nv/h/AE) Frequency (Hz) Figure 4
Frequency Response Frequency Response: Gain (dB) Frequency (Hz) Figure 5
Frequency Response: Phase Shift (Degree) Frequency (Hz) Figure 6
Dynamic Response N/A Figure 7
Offset Output Offset Voltage (mV) Temperature (°C) Figure 8
Rated Out Output Voltage Swing (V) Supply Voltage (V dc) Figure 9
Output Current (mA) Supply Voltage (V dc) Figure 10
Isolated Power Supply Isolated Power Supply Voltage (V) Current Delivered to the Load (mA) Figure 11
Isolated Power Supply Ripple (mV p-p) Current Delivered to the Load (mA)' Figure 12
Isolated Power Supply Ripple (V p-p) Bypass Capacitance (WF) Figure 13
Table f, Performance Characteristics Detailed in the AD203SN Data Sheet
REV. A
