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PDF AD210 Data sheet ( Hoja de datos )
| Número de pieza | AD210 | |
| Descripción | Precision / Wide Bandwidth 3-Port Isolation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Precision, Wide Bandwidth
3-Port Isolation Amplifier
FEATURES
High CMV Isolation: 2500 V rms Continuous
؎3500 V Peak Continuous
Small Size: 1.00" ؋ 2.10" ؋ 0.350"
Three-Port Isolation: Input, Output, and Power
Low Nonlinearity: ؎0.012% max
Wide Bandwidth: 20 kHz Full-Power (–3 dB)
Low Gain Drift: ؎25 ppm/؇C max
High CMR: 120 dB (G = 100 V/V)
Isolated Power: ؎15 V @ ؎5 mA
Uncommitted Input Amplifier
APPLICATIONS
Multichannel Data Acquisition
High Voltage Instrumentation Amplifier
Current Shunt Measurements
Process Signal Isolation
GENERAL DESCRIPTION
The AD210 is the latest member of a new generation of low
cost, high performance isolation amplifiers. This three-port,
wide bandwidth isolation amplifier is manufactured with sur-
face-mounted components in an automated assembly process.
The AD210 combines design expertise with state-of-the-art
manufacturing technology to produce an extremely compact
and economical isolator whose performance and abundant user
features far exceed those offered in more expensive devices.
The AD210 provides a complete isolation function with both
signal and power isolation supplied via transformer coupling in-
ternal to the module. The AD210’s functionally complete de-
sign, powered by a single +15 V supply, eliminates the need for
an external DC/DC converter, unlike optically coupled isolation
devices. The true three-port design structure permits the
AD210 to be applied as an input or output isolator, in single or
multichannel applications. The AD210 will maintain its high
performance under sustained common-mode stress.
Providing high accuracy and complete galvanic isolation, the
AD210 interrupts ground loops and leakage paths, and rejects
common-mode voltage and noise that may other vise degrade
measurement accuracy. In addition, the AD210 provides pro-
tection from fault conditions that may cause damage to other
sections of a measurement system.
PRODUCT HIGHLIGHTS
The AD210 is a full-featured isolator providing numerous user
benefits including:
High Common-Mode Performance: The AD210 provides
2500 V rms (Continuous) and ± 3500 V peak (Continuous) common-
AD210
FUNCTIONAL BLOCK DIAGRAM
FB 16
–IN 17
+IN 19
ICOM 18
+VISS 14
–VISS 15
INPUT
POWER
SUPPLY
INPUT
MOD
OUTPUT
T1
DEMOD
FILTER
1 VO
T2 POWER
POWER
OSCILLATOR
30 29
PWR PWR COM
T3
OUTPUT
POWER
SUPPLY
AD210
2 OCOM
3 +VOSS
4 –VOSS
mode voltage isolation between any two ports. Low input
capacitance of 5 pF results in a 120 dB CMR at a gain of 100,
and a low leakage current (2 µA rms max @ 240 V rms, 60 Hz).
High Accuracy: With maximum nonlinearity of ± 0.012% (B
Grade), gain drift of ± 25 ppm/°C max and input offset drift of
(± 10 ± 30/G) µV/°C, the AD210 assures signal integrity while
providing high level isolation.
Wide Bandwidth: The AD210’s full-power bandwidth of
20 kHz makes it useful for wideband signals. It is also effective
in applications like control loops, where limited bandwidth
could result in instability.
Small Size: The AD210 provides a complete isolation function
in a small DIP package just 1.00" × 2.10" × 0.350". The low
profile DIP package allows application in 0.5" card racks and
assemblies. The pinout is optimized to facilitate board layout
while maintaining isolation spacing between ports.
Three-Port Design: The AD210’s three-port design structure
allows each port (Input, Output, and Power) to remain inde-
pendent. This three-port design permits the AD210 to be used
as an input or output isolator. It also provides additional system
protection should a fault occur in the power source.
Isolated Power: ± 15 V @ 5 mA is available at the input and
output sections of the isolator. This feature permits the AD210
to excite floating signal conditioners, front-end amplifiers and
remote transducers at the input as well as other circuitry at the
output.
Flexible Input: An uncommitted operational amplifier is pro-
vided at the input. This amplifier provides buffering and gain as
required and facilitates many alternative input functions as
required by the user.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
AD210
low side of the signal source. This will not work if the source has
another current path to input common or if current flows in the
signal source LO lead. To minimize CMR degradation, keep the
resistor in series with the input LO below a few hundred ohms.
Figure 5 also shows the preferred gain adjustment circuit. The
circuit shows RF of 50 kΩ, and will work for gains of ten or
greater. The adjustment becomes less effective at lower gains
(its effect is halved at G = 2) so that the pot will have to be a
larger fraction of the total RF at low gain. At G = 1 (follower)
the gain cannot be adjusted downward without compromising
input impedance; it is better to adjust gain at the signal source
or after the output.
Figure 6 shows the input adjustment circuit for use when the
input amplifier is configured in the inverting mode. The offset
adjustment nulls the voltage at the summing node. This is pref-
erable to current injection because it is less affected by subse-
quent gain adjustment. Gain adjustment is made in the feedback
and will work for gains from 1 V/V to 100 V/V.
1
0.1"
GRID
CHANNEL OUTPUTS
2
3
POWER
GAIN
RS
VSIG
47.5kΩ
5kΩ
200Ω
16
17
19
18
50kΩ
14
100kΩ
15
OFFSET
+VISS
–VISS
30 29
VOUT
1
AD210
2
+VOSS
–VOSS
3
4
RG RF
RG RF
12
CHANNEL INPUTS
RG RF
3
Figure 8. PCB Layout for Multichannel Applications with
Gain
Synchronization: The AD210 is insensitive to the clock of an
adjacent unit, eliminating the need to synchronize the clocks.
However, in rare instances channel to channel pick-up may
occur if input signal wires are bundled together. If this happens,
shielded input cables are recommended.
+15V
Figure 6. Adjustments for Inverting Input
Figure 7 shows how offset adjustments can be made at the out-
put, by offsetting the floating output port. In this circuit, ± 15 V
would be supplied by a separate source. The AD210’s output
amplifier is fixed at unity, therefore, output gain must be made
in a subsequent stage.
16
17
19
18
14 +VISS
15 –VISS
30 29
1
VOUT
AD210
2
200Ω
+VOSS
3
–VOSS
4
50kΩ
0.1µF
100k
OFFSET
+15V
–15V
+15V
Figure 7. Output-Side Offset Adjustment
PCB Layout for Multichannel Applications: The unique
pinout positioning minimizes board space constraints for multi-
channel applications. Figure 8 shows the recommended printed
circuit board layout for a noninverting input configuration with
gain.
PERFORMANCE CHARACTERISTICS
Common-Mode Rejection: Figure 9 shows the common-
mode rejection of the AD210 versus frequency, gain and input
source resistance. For maximum common-mode rejection of
unwanted signals, keep the input source resistance low and care-
fully lay out the input, avoiding excessive stray capacitance at
the input terminals.
180
160 RLO = 0Ω
140
RLO = 500Ω
120 RLO = 0Ω
100
RLO = 10kΩ
80 RLO = 10kΩ
60
G = 100
G=1
40
10
20
50 60 100 200 500 1k 2k 5k 10k
FREQUENCY – Hz
Figure 9. Common-Mode Rejection vs. Frequency
–4– REV. A
5 Page | ||
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| PDF Descargar | [ Datasheet AD210.PDF ] | |
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