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Precision High Voltage
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 drive currents up to 2 A.
This platform offers...
- Measure and drive options for applications requiring >50 V and/or ≥200 mA current drive
- Up to 16-bit measurement resolution performance
- Up to 16-bit drive resolution performance
If the system requires
- High voltage measurement >50 V
- High current drive ≥200 mA
- Closed-loop/feedback
Signal chain options to suit different application requirements
- Enable emerging industrial sensors and capacitive drive applications
- High voltage precision measurements enabling new instrumentation automotive end markets
- Provide fast current drive (slew rate) for a range of applications (for example, optical, piezo, and SMU)
Signal chain options to suit different application priorities
- Precision high voltage measurements up to 200 V
- High slew rates and up to 1 A current drive for large cables, loads, and piezo sensors
- Fast settling time options for closed-loop feedback control
- Integrated high speed DAC with high voltage output stage
Precision High Voltage
High Voltage/High Current Drive
Signal chain options for high voltage drive or high current drive.
- High Voltage Drive
- High Current Drive
- Density Optimized 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
PMU
AD5522 Quad parametric measurement unit with integrated DACs and ADCs
Output Drive
ADHV4702-1 LTC6090/LTC6090-5 LTC6091 ADHV4702-1 is a 220V with 2 pA max input bias current, high voltage amp
LTC6090/LTC6090-5 is a 140 V, CMOS rail-to-rail output, Picoamp input current, high voltage amp
LTC6091 is a dual 140 V, CMOS rail-to-rail output, Picoamp input current, high voltage amp
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
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
Resources
Technical Articles
High Differential Voltage Measurement
Buffered and non-buffered signal chain options for measuring differential voltages up to ±110 V are shown below.
- High Accuracy
- Performance-Size Optimized
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
High Voltage Amplifier
ADHV4702-1LTC6090/LTC6090-5LTC6091 ADHV4702-1 is a 220V with 2 pA max input bias current, high voltage amp
LTC6090/LTC6090-5 is a 140 V, CMOS rail-to-rail output, Picoamp input current, high voltage amp
LTC6091 is a dual 140 V, CMOS rail-to-rail output, Picoamp input current, high voltage amp
Difference Amplifier
LT1997-2 Precision funnel amplifier, wide voltage range, selectable gain (0.1 to 0.05)
PMU
AD5522 Quad parametric measurement unit with integrated DACs and ADCs
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
Resources
Technical Articles
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.
- Highest Initial Accuracy
- Performance-Size Optimized
- Highest 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.
- High impedance ±110 V VCM current measurement
- Allows nA current measurement
- 40% smaller footprint than the highest accuracy after calibration signal chain
High Voltage Amplifier
ADHV4702-1 ADHV4702-1 is a 220V with 2 pA max input bias current, high voltage amp
Difference Amplifier
LT6375A LT6375A is a low power, ±270 V common-mode voltage difference amplifier
PMU
AD7606C-18 8-Channel, 1 MSPS bipolar input 18-bit simultaneous sampling data acquisition system ADC
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
High Voltage Amplifier
Difference Amplifier
LT6375A AD8479 LT6375A is a low power, ±270 V common-mode voltage difference amplifier
AD8479 is a low power, ±600 V common-mode voltage difference amplifier
PMU
AD7606C-18 8-Channel, 1 MSPS bipolar input 18-bit simultaneous sampling data acquisition system ADC
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
High Voltage Amplifier
ADHV4702-1 ADHV4702-1 is a 220V with 2 pA max input bias current, high voltage amp
Precision Resistor Network
LT5400 Quad matched resistor network for improved CMRR and gain error
PMU
AD5522 Quad parametric measurement unit with integrated DACs and ADCs
Hong Kong, China