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PDF AD203SN Data sheet ( Hoja de datos )
| Número de pieza | AD203SN | |
| Descripción | 10 kHz Bandwidth Isolation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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r.ANALOG
WDEVICES
Rugged, Military Temperature Range,
10 kHz Bandwidth Isolation Amplifier
AD203SN I
FEATURES
Rugged Design:
C
Environmental Test Methods
1004 (Moisture Resistance)
1010 Condition B (Temperature Cycling,
-55°C to +125°C)
2002 Condition B (Mechanical Shock@ 1,500 g
for 0.5 ms)
2004 (Lead Integrity)
2007 Condition A (Variable Frequency Vibration
@20g)
2015 (Resistance to Solvents)
Reliable Design: Conforms to Stringent Quality and
Reliability Standards
Characterized to the Full Military Temperature Range
-55°C to +125°C Rated Performance
10 kHz Full Power Bandwidth
Low Nonlinearity: ±0.025% max
Wide Output Range: ±10 V min (Into a 2.5 k!l Load)
High CMV Isolation: 1500 V RMS Continuous
Isolated Power: ±15 V DC@ ±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
Reject 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
FUNCTIONAL BLOCK DIAGRAM
MODULATOR
DEMODULATOR
INPUT PORT~'I~OUTPUT PORT
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 de supply, eliminates the need for an
external de/de 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 ± 15 V de (CT; ± 5 mA.
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.
1 page  
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 -55°C
to + 125°C temperature range.
0.5k
-1k
-2k
E -3k
cc..
I -4k
2
<i
(!) -5k
/
II"
I
I
I
I
I-6k
I
-7k
-Bk
-55 -40 -25
+25 +85
TEMPERATURE - "C
+125
Figure 1. Gain {ppm of Span) vs. Temperature (°C)
Note: 1 ppm (part per million) is equivalent to 0.0001 %.
AD203SN
Gain Nonlinearity. The maximum nonlinearity error of the
AD203SN, at a gain of 1 VIV, is specified as ±0.025% 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
#. +0.01
I
a: 0
0
~
w
-0.0
1
-0.02
+4
+2 >
E
0
I
a:
-2 0aaw::
-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
1 VIV
Parameter
Gain
Input Voltage Rating
Input Noise
Frequency Response
Offset
Rated Out
Isolated Power Supply
Key Specifications
Gain (ppm of Span)
Gain Nonlinearity (Expressed in mV
and % of p-p Output)
Common Mode Rejection (dB)
Input Noise (nV/VHz)
Frequency Response: Gain (dB)
Frequency Response: Phase Shift (Degree)
Dynamic Response
Output Offset Voltage (mV)
Output Voltage Swing (V)
Output Current (mA)
Isolated Power Supply Voltage (V)
Isolated Power Supply Ripple (mV p-p)
Isolated Power Supply Ripple (V p-p)
As a Function of
Temperature (0C)
Output Voltage Swing (V)
Common Mode Signal Frequency
(Hz), Amplifier Gain (VIV) and
Input Source Resistance (!1)
Frequency (Hz)
Frequency (Hz)
Frequency (Hz)
NIA
Temperature (0C)
Supply Voltage (V de)
Supply Voltage (V de)
Current Delivered to the Load (mA)
Current Delivered to the Load (mA)
Bypass Capacitance (µF)
Table I. Performance Characteristics Detailed in the AD203SN Data Sheet
Shown In
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Rev. B
-5-
5 Page 
AD203SN
Low Level Inputs
In applications where low level signals need to be isolated (ther-
mocouples are one such application), a low drift input amplifier
can be used with the AD203SN. Figure 25 illustrates this imple-
mentation of the AD203SN. The circuit design also includes a
three-pole active filter which provides for enhanced common
mode rejection at 60 Hz and normal mode rejection of frequen-
cies above a few Hz. If any offset adjustments are desired, they
are best done at the trim pins of the low drift input amplifier.
Gain adjustments can be done at the feedback resistor.
Figure 23. Using the AD203SN as an Isolated Process
Current to Voltage Converter
For the circuit of Figure 23, the input to output transfer func-
tion can be expressed as:
where
Vour = 625 xJJN-2.5 V
VouT
IrN
Output Voltage (V)
Input Current in milliamps (mA). This current is
limited to the 4 to 20 mA range.
Current Shunt Measurements
In addition to isolating and converting process current signals
into voltage signals, the AD203SN can be used to indicate the
value of any loop current in general. Figure 24 illustrates a typi-
cal current shunt measurement application of the AD203SN. A
small sensing resistor RsHUND placed in series with the current
·1oop, develops a small differential voltage that may be further
scaled to provide an isolator output voltage that is directly pro-
. portional to the current. The voltage developed across the shunt
can potentially be several hundred to a thousand volts above
ground. In this circuit, the AD203SN provides the necessary
scaling of the shunt signal while providing high common-mode
voltage isolation and high common mode rejection of de and
60 Hz components.
t
VouT {±10V)
PWRIN
Figure 25. Using the AD203SN with Low Level Inputs
The input-output relationship for the circuit shown in Figure 25
can be written as:
Vour = VINx (1 +SO kWRG)
where
VouT
VrN
RG
Output Voltage (V)
Low Level Input Voltage (V)
Isolation Amplifier Gain Resistance (D).
Noise Reduction in Data Acquisition Systems
The AD203SN uses amplitude modulation techniques with a
35 kHz carrier to pass both ac and de signals across the isolation
barrier. Some of the carrier's harmonics are unavoidably passed
through to the isolator output in the form of ripple. In most
cases, this noise source is insignificant when compared to the
measured signal. However, in some applications, particularly
when a fast AID converter is used following the isolator, it may
be desirable to add filtering at the isolator's output in order to
reduce the carrier ripple. Figure 26 shows a circuit that will
reduce the carrier ripple through the use of a two-pole output
filter.
Figure 24. Using the AD203SN for Current Shunt
Measurements
The transfer function for the circuit of Figure 24 can be written
as:
where
VouT = RsHuNrx(I+Rp/RG)xlwoP
VouT
RsHUNT
RF
RG
I LOOP
Output Voltage (V)
Sense or Current Shunt Resistance (D)
Feedback Resistance (D)
Gain Resistance (D)
Loop Current (A).
Figure 26. Noise Reduction in Data Acquisition Systems
Using the AD203SN
Rev. B
-11-
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AD203SN.PDF ] | |
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