ADHV4702-1BCPZ-R7 datasheet(20/21 Pages) AD

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ADHV4702-1

Data Sheet

Rev. A | Page 20 of 21

APPLICATIONS INFORMATION

POWER SUPPLY AND DECOUPLING

The ADHV4702-1 can operate from a single supply or dual

supply. The total supply voltage (VCC − VEE) must be between

24 V and 220 V. Decouple each supply pin to ground using high

quality, low effective series resistance (ESR), 0.1 µF capacitors.

Place decoupling capacitors as close to the supply pins as possible.

Additionally, place 1.2 µF tantalum capacitors from each supply

to ground to provide sufficient low frequency decoupling and

supply the needed current to support large, fast slewing signals

at the ADHV4702-1 output. To ensure reliable operation under

high voltages, the voltage ratings for the bypass capacitors must

be higher than the supply voltages of ADHV4702-1.

HIGH VOLTAGE GUARD RING

The ADHV4702-1 features a pin placement that facilitates the

use of a guard ring around the noninverting input of the

amplifier. Guarding minimizes leakage from nearby pins and

helps to achieve the benefit of low input bias current. The guard

must be free of solder mask so that it remains exposed on the

surface of the PCB. Drive the guard ring to a potential that

tracks the input of the amplifier.

HIGH VOLTAGE DAC VOLTAGE SUBTRACTOR

The ADHV4702-1 can be combined with a dual, 16-bit

voltage output, DAC, such as the AD5752R, to produce a

versatile high voltage DAC solution. For this configuration,

set up the ADHV4702-1 as a voltage subtractor with a gain

of 20, which is ideally suited for chemical analysis (mass

spectrometry), piezodrive, scanning electron microscope

(SEM), LiDAR APD/SPAD, and silicon photomultiplier bias

control applications.

DIN1

VOUTA

VOUTB

DIN2

2kΩ

2.5kΩ

40kΩ

2kΩ

ADHV4702-1

+VS

HVOUT_FORCE

–VS

HVOUT_SENSE

40kΩ

Figure 61. ADHV4702-1 Configured as a Voltage Subtractor Using DACs

HIGH CURRENT OUTPUT DRIVER

Figure 62 shows a system level application of the ADHV4702-1

that boosts the output current drive of the amplifier. By introducing

a discrete unity-gain output stage, the ADHV4702-1 can be

used as a high power output driver retaining the precision

performance capabilities of the standalone amplifier, such as

offset, drift, open-loop gain, and CMRR, while increasing the

output current drive up to the current handling capabilities of

the discrete devices.

ADHV4702-1

+VS

–VS

RLOAD

VOUT

P CHANNEL

N CHANNEL

RFB

VIN

Figure 62. High Current Output Driver Schematic

SIGNAL RANGE EXTENDER

Figure 63 shows an example of a signal range extender

configuration. By introducing two additional high power, discrete,

metal-oxide semiconductor field effect transistors (MOSFETs), the

range extender can deliver at least twice the signal range

(depending on the MOSFET selection), while retaining the original

performance characteristics of the amplifier.

VIN

RTOP

RBOT

RTOP

RBOT

ADHV4702-1

+VS

RFB

–VS

VOUT

RLOAD

P CHANNEL

N CHANNEL

Figure 63. Voltage Extender Schematic

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