Driven by trends like the rapid electrification of automobiles, applications utilizing high-voltage batteries are becoming increasingly common worldwide.
For these high-voltage battery applications, particularly in electric vehicles (EVs), the performance characteristics of isolation amplifiers, including their insulation capability, robustness, and precision in voltage and current monitoring, are crucial for enhancing overall application performance and efficiency. To extend driving range, batteries used in EVs are evolving from 400V to 800V systems, and these voltages may increase further in the future.
As you may already know, key factors for isolation amplifiers include high insulation performance, compliance with standards, and analog signal accuracy.
But is that really enough? To achieve a truly optimized solution, shouldn’t factors like the total implementation area with peripheral components, cost of components, ease of design, and usability also be factored in?

The ADuM4195-1 from Analog Devices is a reinforced isolation amplifier characterized by low offset voltage and low gain error. It provides an isolation voltage of 5kV and is housed in a compact 8-pin SOIC package. Optimized for isolated voltage sensing, it incorporates a high impedance input buffer and exhibits high linearity across an input voltage range of 0.25V to Vdd -0.7V.
Unlike typical isolation amplifiers, which often have restricted input voltage ranges, the ADuM4195-1 features a wide input dynamic range along with minimal offset and gain errors, contributing to an improved signal-to-noise ratio.
With a fixed gain of 1x, gain setting using external resistors is unnecessary, and the single-ended output eliminates the need for a subsequent differential-to-single-ended conversion circuit. This inherent simplicity ensures the design is not susceptible to errors from external components, thereby helping to maintain performance levels effectively.

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  Figure 1: Internal Block Diagram

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  Figure 2: Reference Circuit Example

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  Figure 3: Reference Layout

Low offset, low gain error / Wide input dynamic range / Single-ended output / AEC-Q100 qualified

• Isolation Voltage: 5000V RMS
• Offset Error: ±5mV (25°C max) Offset Drift: −22µV/°C (typ)
• Gain Error: ±0.5% (max) Gain Drift: ±42 ppm/°C (max)
• Gain: 1x fixed
• Power Supply Voltage VDD1: 4.5V to 5.5V VDD2: 4.5V to 5.5V
• Bandwidth: 210kHz
• Operating Temperature Range: Ta −40°C to +125°C Tj_max: 150°C
• Applicable Standards (Pending)
  - UL Recognition: 5000V RMS for 1 minute per UL 1577
  - CSA Component Acceptance Notice #5A compliant
  - VDE conformity certificate
  - DIN V VDE V 0884-11（VDE V 0884-11）
  - VIORM = 1401V peak

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