Isolation Amplifiers

Isolation Amplifiers are instruments that have been designed to measure the smallest current and voltage signals in the presence of high common mode voltage by providing electrical safety barrier and electrical isolation. They are differential amplifiers that protect data acquisition components from common mode voltages, which are potential differences between instrument ground and signal ground.

How to select a correct isolation amplifier?
There are two main types of isolation amplifiers and the decision of using one or another may depend on several aspects and user needs:

• Single-ended, floating common - an isolated and quasi-balanced input (the floating common is typically connected to the (-) input of differential amplifier). Suitable for off-ground measurements up to breakdown voltage of the isolation barrier, and exhibits very good common mode rejection (100 dB typical).

• Differential, floating common - an isolated and balanced input. Suitable for off-ground measurements of the breakdown voltage of the isolation barrier, and exhibits superb common mode rejection (>120 dB).

What is typical application of isolation amplifiers?
Isolation amplifiers are commonly used in test and measurement or medical devices. Also, they are popular in solar and fuel cells construction to profile the performance of individual series-connected voltage cells.

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Description Price Power Supply Type Typical Dual Supply Voltage Typical Single Supply Voltage Isolation Mode Rejection Rail to Rail Number of Channels per Chip Maximum Voltage Gain Mounting Type Package Type Pin Count Dimensions Height Width Length
RS Stock No. 786-3151
Mfr. Part No.ADUM3190ARQZ
$3.625
Each (In a Pack of 2)
units
Single - 3 → 20 V - - 2 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 796-8789
Mfr. Part No.AD210AN
$144.03
Each
units
Dual ±15V - 120dB - 1 100V/V Through Hole PDIP 12 53.3 x 25 x 8.91mm 8.91mm 25mm 53.3mm
RS Stock No. 159-9273
Mfr. Part No.ADUM3190ARQZ
$2.742
Each (In a Tube of 98)
units
Single - 3 → 20 V - - 2 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 912-9983
Mfr. Part No.AD210AN
$130.69
Each (In a Tube of 9)
units
Dual ±15V - 120dB - 1 100V/V Through Hole PDIP 12 53.3 x 25 x 8.91mm 8.91mm 25mm 53.3mm
RS Stock No. 159-9303
Mfr. Part No.ADUM3190SRQZ
$3.032
Each (In a Tube of 98)
units
Single - 3 → 20 V 72dB - 1 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 796-8736
Mfr. Part No.ADUM3190SRQZ
$3.534
Each (In a Pack of 7)
units
Single - 3 → 20 V 72dB - 1 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 106-7013
Mfr. Part No.AD202JN
$87.672
Each (In a Tube of 9)
units
Single - 15 V 130dB - 1 40dB Through Hole PDIP 11 8.9 x 53.3 x 17.8mm 8.9mm 17.8mm 53.3mm
RS Stock No. 127-0272
Mfr. Part No.AD202JN
$82.87
Each
units
Single - 15 V 130dB - 1 40dB Through Hole PDIP 11 8.9 x 53.3 x 17.8mm 8.9mm 17.8mm 53.3mm
RS Stock No. 759-2187
Mfr. Part No.AD202KN
$108.04
Each
units
Single - 15 V 105dB - 2 1 → 100V/V Through Hole PDIP 10 53.3 x 17.8 x 8.52mm 8.52mm 17.8mm 53.3mm
RS Stock No. 758-9588
Mfr. Part No.AD204KY
$94.14
Each
units
- - - 110dB - 2 1 → 100V/V Through Hole SIP 10 52.8 x 6.6 x 15.9mm 15.9mm 6.6mm 52.8mm
RS Stock No. 159-8059
Mfr. Part No.AD204KY
$94.644
Each (In a Tube of 9)
units
- - - 110dB - 2 1 → 100V/V Through Hole SIP 10 52.8 x 6.6 x 15.9mm 15.9mm 6.6mm 52.8mm
RS Stock No. 159-9277
Mfr. Part No.ADUM4190BRIZ
$3.401
Each (In a Tube of 37)
units
Single - 3 → 20 V - - 1 80dB Surface Mount SOIC 16 12.85 x 7.6 x 2.44mm 2.44mm 7.6mm 12.85mm
RS Stock No. 786-3154
Mfr. Part No.ADUM3190BRQZ
$3.345
Each (In a Pack of 2)
units
Single - 3 → 20 V - - 2 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 758-9579
Mfr. Part No.AD204KN
$94.05
Each
units
- - - 110dB - 2 1 → 100V/V Through Hole PDIP 10 53.3 x 17.8 x 8.52mm 8.52mm 17.8mm 53.3mm
RS Stock No. 159-9274
Mfr. Part No.ADUM4190ARIZ
$3.164
Each (In a Tube of 37)
units
Single - 3 → 20 V - - 1 80dB Surface Mount SOIC 16 12.85 x 7.6 x 2.44mm 2.44mm 7.6mm 12.85mm
RS Stock No. 159-9305
Mfr. Part No.ADUM4190TRIZ
$3.665
Each (In a Tube of 37)
units
Single - 3 → 20 V 72dB - 1 80dB Surface Mount SOIC 16 12.85 x 7.6 x 2.44mm 2.44mm 7.6mm 12.85mm
RS Stock No. 145-7696
Mfr. Part No.ADUM3190BRQZ
$2.953
Each (In a Tube of 98)
units
Single - 3 → 20 V - - 2 80dB Surface Mount QSOP 16 5 x 4.01 x 1.65mm 1.65mm 4.01mm 5mm
RS Stock No. 759-2196
Mfr. Part No.AD202KY
$115.29
Each
units
Single - 15 V 105dB - 2 1 → 100V/V Through Hole SIP 10 52.8 x 6.6 x 15.9mm 15.9mm 6.6mm 52.8mm
RS Stock No. 106-7018
Mfr. Part No.AD202JY
$78.078
Each (In a Tube of 9)
units
Single - 15 V 130dB - 1 40dB Through Hole SIP 11 15.9 x 52.8 x 6.6mm 15.9mm 6.6mm 52.8mm
RS Stock No. 912-9787
Mfr. Part No.AD202KY
$105.673
Each (In a Tube of 9)
units
Single - 15 V 105dB - 2 1 → 100V/V Through Hole SIP 10 52.8 x 6.6 x 15.9mm 15.9mm 6.6mm 52.8mm