Precision High Voltage Solutions

Analog Devices’ precision high-voltage signal chains combine precision high-voltage amplifiers, high-voltage digital-to-analog converters (DACs), difference amplifiers, and matched resistor networks. Drive signal chains are offered at several voltage, current drive, density, and slew rates, allowing system designers to find a solution optimized for their needs. Each signal chain provides example solutions to drive high-voltage signals up to 216 V or currents up to 2 A.

Precision high-voltage measurement signal chains support a range of common-mode voltages, allowing interchangeable density, dynamic range, and accuracy depending on application needs. These signal chains provide examples to measure large differential signals up to 220 V or small differential signals with a large common-mode voltage.

Precision High Voltage Solutions

  • High voltage/high current drive
  • High differential voltage measurement
  • High common-mode current measurement

High voltage/high current drive

Signal chain options for high voltage drive or high current drive.

High voltage drive

Value Proposition

  • Signal chain optimized for high voltage drive.
  • More reliable than discrete high voltage amplifier design
  • High voltage output stage supports
    • ADHV4702-1: ±108 V, 20 mA drive
    • LTC6090, LTC6091: ±70 V, 50 mA drive
  • Smaller footprint than discrete driver design
  • Optional bootstrapped driver stage for extended range
    • ADHV4702-1: ±108 V, 20 mA drive
    • ±250 V (as shown)
  • Option to parallel multiple amps to increase drive current

Product Selection Guide: High voltage drive

PMU

  • AD5522Quad parametric measurement unit with integrated DACs and ADCs

Output drive

  • ADHV4702-1 220V with 2 pA max input bias current, high voltage ampADHV4710+/- 55V supplies, +/- 52 V out, fault protection, programmableLTC6090/LTC6090-5140 V, CMOS rail-to-rail output, Picoamp input current, high voltage ampLTC6091Dual 140 V, CMOS rail-to-rail output, Picoamp input current, high voltage amp

High current drive

Value Proposition

  • Signal chain optimized for high current drive.
  • High current drive and high slew capability
  • Smaller footprint than discrete design
  • More reliable than discrete driver design
    • Thermal protection
    • Overvoltage/current alerts

Product Selection Guide: High current drive

PMU

  • AD5522Quad parametric measurement unit with integrated DACs and ADCs

Output drive

  • ADA4870±20 V, 1 A output drive, 2500 V/μs slew rate output drive amplifierADHV4710+/- 55V supplies, +/- 52 V out, fault protection, programmableLT1210±15 V, 2A output drive, 900 V/μs slew rate current feedback amplifier

Density optimized voltage drive

Value Proposition

  • Signal chain optimized for density and voltage drive.
  • Small footprint with integrated ease of use: 225 mm2
    • >8× smaller than 32-channel ADHV4702-1 + DAC
  • High channel count (up to 32 channels)
  • Integrated DAC and high voltage amplifier
    • Trades off current drive for a more integrated solution

Product Selection Guide: Density optimized voltage drive

Isolation

  • ADuM1441Micropower quad-channel digital isolator, default high (3/1 channel directionality)

DAC and output drive

  • AD5535B32-Channel, 50 V to 200 V 14-bit DAC, 0.5 mA drive, 10 V/μs slewAD55044-Channel, 30 V or 60 V 12-bit DAC

High differential voltage measurement

Buffered and non-buffered signal chain options for measuring differential voltages up to ±110 V are shown below.

High accuracy

Value Proposition

  • Buffered and non-buffered signal chain options for measuring differential voltages up to ±110 V and optimized for high accuracy.
  • High impedance voltage measurement
    • ±50 V: LTC6091 or two LTC6090s are the buffer
    • ±108 V: two ADHV4702-1s are the buffer
  • Difference amplifier output interfaces directly with ADC/PMU
  • ±2.5 V for ±50 V input
  • ±5 V for ±100 V input

Product Selection Guide: High accuracy

High voltage amplifier

  • ADHV4702-1 220V with 2 pA max input bias current, high voltage ampADHV4710+/- 55V supplies, +/- 52 V out, fault protection, programmableLTC6090/LTC6090-5140 V, CMOS rail-to-rail output, Picoamp input current, high voltage ampLTC6091Dual 140 V, CMOS rail-to-rail output, Picoamp input current, high voltage amp

Difference amplifier

  • LT1997-2Precision funnel amplifier, wide voltage range, selectable gain (0.1 to 0.05)

PMU

  • AD5522Quad parametric measurement unit with integrated DACs and ADCs

Performance-sized optimized

Value Proposition

  • Buffered and non-buffered signal chain options for measuring differential voltages up to ±110 V and optimized for Performance-Size.
  • High performance when voltage source is low impedance
    • High source impedance degrades CMRR and gain accuracy—it creates offset voltage due to interaction between IBIAS and RSOURCE
    • Option to improve performance by adding HV buffers—see high accuracy solution
  • Difference amplifier output interfaces directly with ADC/PMU
    • ±2.5 V for ±50 V input, ±5 V for ±100 V input

Product Selection Guide: Performance-sized optimized

High voltage amplifier

  • N/A

Difference amplifier

  • LT1997-2Precision funnel amplifier, wide voltage range, selectable gain (0.1 to 0.05)

PMU

  • AD5522Quad parametric measurement unit with integrated DACs and ADCs

High common-mode current measurement

When measuring nA load currents, a high input impedance is required. Two high accuracy buffered options are provided with ADHV4702-1 as the input stage. One uses a difference amplifier while the other creates a difference amplifier using the LT5400 matched resistor network.

High intial accuracy

Value Proposition

  • When measuring nA load currents, a high input impedance is required. A high accuracy buffered option is provided with ADHV4702-1 as the input stage.
  • High impedance ±110 V VCM current measurement
  • Allows nA current measurement
  • 40% smaller footprint than the highest accuracy after calibration signal chain

Product Selection Guide: High intial accuracy

High voltage amplifier

  • ADHV4702-1 220V with 2 pA max input bias current, high voltage amp

Difference amplifier

  • LT6375ALow power, ±270 V common-mode voltage difference amplifier

PMU

  • AD7606C-188-Channel, 1 MSPS bipolar input 18-bit simultaneous sampling data acquisition system ADC

Performance-size optimized

Value Proposition

  • When measuring nA load currents, a high input impedance is required.
  • 5× lower power
  • Smaller than the highest accuracy after calibration signal chain
    • 11× LT6375A DFN: 16 mm2
    • 6× with AD8479 standard 8-lead SOIC: 31 mm2
  • Current measurement resolution
    • Hundreds of uA with AD8479
    • 1 mA with LT6375A
  • Accuracy varies with common-mode voltage
    • Based on difference amp
    • input impedance

Product Selection Guide: Performance-size optimized

High voltage amplifier

  • N/A

Difference amplifier

  • LT6375ALow power, ±270 V common-mode voltage difference amplifierAD8479Low power, ±600 V common-mode voltage difference amplifier

PMU

  • AD7606C-188-Channel, 1 MSPS bipolar input 18-bit simultaneous sampling data acquisition system ADC

High accuracy after calibration

Value Proposition

  • When measuring nA load currents, a high input impedance is required. A high accuracy buffered option is provided with ADHV4702-1 as the input stage. This signal chain creates a difference amplifier using the LT5400 matched resistor network.
  • High impedance ±75 V VCM current measurement
  • Allows nA current measurement
  • Highest accuracy after room temperature calibration
    • 2× more accurate over temperature than high accuracy option
  • Difference amplifier output of ±5 V scaled down to interface with ADC/PMU

Product Selection Guide: High accuracy after calibration

High voltage amplifier

  • ADHV4710+/- 55V supplies, +/- 52 V out, fault protection, programmable

Difference amplifier

  • LT5400Quad matched resistor network for improved CMRR and gain error

PMU

  • AD5522Quad parametric measurement unit with integrated DACs and ADCs

Additional resources