Analog Devices AD210 Datasheet

INPUT

POWER

SUPPLY

19

14

15

16

17

18

V

O

30

29

T2

POWER

POWER

OSCILLATOR

INPUT OUTPUT

MOD

DEMOD

FILTER

1

2

OUTPUT

POWER

SUPPLY

3

4

O

COM

+V

OSS

–V

OSS

AD210

PWR COMPWR

T3

T1

–V

ISS

+V

ISS

I

COM

+IN

–IN

FB

Precision, Wide Bandwidth

a

FEATURES
High CMV Isolation: 2500 V rms Continuous

63500 V Peak Continuous
Small Size: 1.00" 3 2.10" 3 0.350"
Three-Port Isolation: Input, Output, and Power
Low Nonlinearity: 60.012% max
Wide Bandwidth: 20 kHz Full-Power (–3 dB)
Low Gain Drift: 625 ppm/8C max
High CMR: 120 dB (G = 100 V/V)
Isolated Power: 615 V @ 65mA
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 sur­face-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 in­ternal to the module. The AD210’s functionally complete de­sign, 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 pro­tection 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 ±

*Covered by U.S. Patent No. 4,703,283.

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.

3500 V peak (Continuous) common-

3-Port Isolation Amplifier

AD210*

FUNCTIONAL BLOCK DIAGRAM

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 inde­pendent. 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 pro­vided at the input. This amplifier provides buffering and gain as
required and facilitates many alternative input functions as
required by the user.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

AD210–SPECIFICATIONS

WARNING!

ESD SENSITIVE DEVICE

(typical @ +258C, and VS = +15 V unless otherwise noted)

Model AD210AN AD210BN AD210JN

GAIN

Range 1 V/V – 100 V/V * *
Error ± 2% max ±1% max *
vs. Temperature(0°C to +70°C) +25 ppm/°C max * *

vs. Supply Voltage ±0.002%/V * *
Nonlinearity

INPUT VOLTAGE RATINGS

Linear Differential Range ±10 V * *
Maximum Safe Differential Input ±15 V * *
Max. CMV Input-to-Output *

ac, 60 Hz, Continuous 2500 V rms * 1500 V rms
dc, Continuous ±3500 V peak * ± 2000 V peak

Common-Mode Rejection *

60 Hz, G = 100 V/V *

≤ 500 Ω Impedance Imbalance 120 dB * *

R

S

Leakage Current Input-to-Output *

@ 240 V rms, 60 Hz 2 µA rms max * *

INPUT IMPEDANCE

Differential l0
Common Mode 5 GΩi5pF * *

INPUT BIAS CURRENT

Initial, @ +25°C 30 pA typ (400 pA max) * *
vs. Temperature (0°C to +70°C) 10 nA max * *

INPUT DIFFERENCE CURRENT

Initial, @ +25°C 5 pA typ (200 pA max) * *
vs. Temperature(0°C to + 70°C) 2 nA max * *

INPUT NOISE

Voltage (l kHz) 18 nV/√
Current (1 kHz) 0.01 pA/√Hz **

FREQUENCY RESPONSE

Bandwidth (–3 dB) *

G = 1 V/V 20 kHz * *
G = 100 V/V 15 kHz * *

Settling Time (± 10 mV, 20 V Step) *

G = 1 V/V 150 µs* *
G = 100 V/V 500 µs* *

Slew Rate (G = 1 V/V) 1 V/µs* *

OFFSET VOLTAGE (RTI)

Initial, @ +25°C ±15 ± 45/G) mV max (±5 ±15/G) mV max *
vs. Temperature (0°C to +70°C) (±10 ±30/G) µV/°C* *

(–25°C to +85°C) (±10 ±50/G) µV/°C* *
RATED OUTPUT

Voltage, 2 kΩ Load ± 10 V min * *
Impedance 1 Ω max * *
Ripple (Bandwidth = 100 kHz) 10 mV p-p max * *

ISOLATED POWER OUTPUTS

Voltage, No Load ±15 V * *
Accuracy ±10% * *
Current ±5mA * *
Regulation, No Load to Full Load See Text * *
Ripple See Text * *

POWER SUPPLY

Voltage, Rated Performance +15 V dc ± 5% * *
Voltage, Operating +15 V dc ± 10% * *
Current, Quiescent 50 mA * *
Current, Full Load – Full Signal 80 mA * *

TEMPERATURE RANGE

Rated Performance –25°C to +85°C* *
Operating –40°C to +85°C* *
Storage –40°C to +85°C* *

PACKAGE DIMENSIONS

Inches 1.00 × 2.10 × 0.350 * *
Millimeters 25.4 × 53.3 × 8.9 * *

NOTES
*Specifications same as AD210AN.

1

Nonlinearity is specified as a % deviation from a best straight line..

2

RTI – Referred to Input.

3

A reduced signal swing is recommended when both ±V

loaded, due to supply voltage reduction.

4

See text for detailed information. _

Specifications subject to change without notice.

(–25°C to +85°C) ±50 ppm/°C max * *

1

(–25°C to +85°C) 30 nA max * *

(–25°C to +85°C) 10 nA max * *

(10 Hz to 10 kHz) 4 µV rms * *

2

3

±0.025% max ±0.012% max *

12

Ω **

Hz **

4

and ±V

ISS

supplies are fully

OSS

–2–

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

AC1059 MATING SOCKET

AD210 PIN DESIGNATIONS

Pin Designation Function

1 V
2O
3+V
4–V
14 +V
15 –V

O

COM

OSS

OSS

ISS

ISS

Output
Output Common
+Isolated Power @ Output
–Isolated Power @ Output
+Isolated Power @ Input

–Isolated Power @ Input
16 FB Input Feedback
17 –IN –Input
18 I

COM

Input Common
19 +IN +Input
29 Pwr Com Power Common
30 Pwr Power Input

CAUTION

ESD (electrostatic discharge) sensitive device. Elec­trostatic charges as high as 4000 V readily accumu­late on the human body and test equipment and can
discharge without detection. Although the AD210
features proprietary ESD protection circuitry, per­manent damage may occur on devices subjected to
high energy electrostatic discharges. Therefore,
proper ESD precautions are recommended to avoid
performance degradation or loss of functionality.

REV. A

INSIDE THE AD210

19

14

15

16

17

18

30

29

+V

OSS

V

SIG

AD210

+V

ISS

–V

ISS

+15V

2

3

4

–V

OSS

1

V

OUT

= V

SIG

1+

( )

R

F

R

G

R

G

R

F

19

14

15

16

17

18

30

29

+V

OSS

AD210

+V

ISS

–V

ISS

+15V

2

3

4

–V

OSS

1

R

S1

I

S

V

S2

V

S1

R

S2

R

F

V

OUT

V

OUT

= –R

F

V

S1

R

S1

( )

V

S2

R

S2

+

+ IS + ...

19

15

16

17

18

30

29

+V

OSS

AD210

+V

ISS

–V

ISS

+15V

2

3

4

–V

OSS

R

G

HI

V

OUT

V

SIG

14

200Ω

47.5kΩ
5kΩ

100kΩ

50kΩ

LO

GAIN

OFFSET

1

The AD210 basic block diagram is illustrated in Figure 1.
A +15 V supply is connected to the power port, and
±15 V isolated power is supplied to both the input and
output ports via a 50 kHz carrier frequency. The uncom­mitted input amplifier can be used to supply gain or buff­ering of input signals to the AD210. The fullwave
modulator translates the signal to the carrier frequency for
application to transformer T1. The synchronous demodu­lator in the output port reconstructs the input signal. A
20 kHz, three-pole filter is employed to minimize output
noise and ripple. Finally, an output buffer provides a low
impedance output capable of driving a 2 kΩ load.

INPUT OUTPUT

MOD

T2

T1

POWER

POWER

OSCILLATOR

30

PWR COMPWR

DEMOD

FILTER

29

T3

AD210

OUTPUT

POWER

SUPPLY

1

V

O

O

2

COM

+V

3

OSS

4

–V

OSS

+V

–V

I

COM

–IN
+IN

FB

ISS

ISS

16

17
19

18

14

15

INPUT

POWER

SUPPLY

Figure 1. AD210 Block Diagram

USING THE AD210

The AD210 is very simple to apply in a wide range of ap­plications. Powered by a single +15 V power supply, the
AD210 will provide outstanding performance when used
as an input or output isolator, in single and multichannel
configurations.

Input Configurations: The basic unity gain configura­tion for signals up to ±10 V is shown in Figure 2. Addi­tional input amplifier variations are shown in the following
figures. For smaller signal levels Figure 3 shows how to
obtain gain while maintaining a very high input impedance.

16

V

1

OUT

V

OUT

(±10V)

2

V

SIG

±10V

17
19

AD210

18

AD210

Figure 3. Input Configuration for G > 1

Figure 4 shows how to accommodate current inputs or sum cur­rents or voltages. This circuit configuration can also be used for
signals greater than ±10 V. For example, a ±100 V input span
can be handled with R

Figure 4. Summing or Current Input Configuration

Adjustments

When gain and offset adjustments are required, the actual cir­cuit adjustment components will depend on the choice of input
configuration and whether the adjustments are to be made at
the isolator’s input or output. Adjustments on the output side
might be used when potentiometers on the input side would
represent a hazard due to the presence of high common-mode
voltage during adjustment. Offset adjustments are best done at
the input side, as it is better to null the offset ahead of the gain.

Figure 5 shows the input adjustment circuit for use when the in­put amplifier is configured in the noninverting mode. This offset
adjustment circuit injects a small voltage in series with the

= 20 kΩ and RS1 = 200 kΩ.

F

+V

ISS

14

–V

15

ISS

30

Figure 2. Basic Unity Gain Configuration

The high input impedance of the circuits in Figures 2 and
3 can be maintained in an inverting application. Since the
AD210 is a three-port isolator, either the input leads or
the output leads may be interchanged to create the signal
inversion.

REV. A

+15V

29

+V

–V

OSS

OSS

3

4

Figure 5. Adjustments for Noninverting Input

–3–