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Data Sheet

ADA4610-1/ADA4610-2/ADA4610-4

Rev. G | Page 19 of 25

FUNCTIONAL DESCRIPTION

The ADA4610-1/ADA4610-2/ADA4610-4 are manufactured

using the Analog Devices, Inc., iPolar® process, a 36 V dielectrically

isolated (DI) process with P-channel JFET technology. The

unique architecture of the ADA4610-1/ADA4610-2/ADA4610-4

makes it possible to combine high precision and high speed

characteristics into a high voltage, low power op amp. A simplified

schematic for the ADA4610-1/ADA4610-2/ADA4610-4 is

shown in Figure 57. The JFET input stage architecture offers

advantages of low input bias current, high bandwidth, high

gain, low noise, and no phase reversal when the applied input

signal exceeds the common-mode voltage range. The output

stage is rail to rail with high drive characteristics and low

dropout voltage for both sinking and sourcing currents.

The ADA4610-1/ADA4610-2/ADA4610-4 are unconditionally

stable for all gain configurations, even with capacitive loads well

in excess of 1 nF. The devices have internal protective circuitry

that allows voltages as high as 0.3 V beyond the supplies to be

applied at the input of either terminal without causing damage (for

higher input voltages, refer to the Input Overvoltage Protection

section). The ADA4610-1/ADA4610-2 B grades achieve less

than 0.4 mV of offset and 4 µV/°C of offset drift; these

characteristics are usually associated with very high precision

bipolar input amplifiers. The gate current of a typical JFET

doubles every 10°C, resulting in a similar increase in input bias

current over temperature. The low power consumption

characteristic of the ADA4610-1/ADA4610-2/ADA4610-4

minimizes the die temperature, which warrants low input bias

currents even at elevated ambient temperatures, making the

amplifiers ideal for applications that require low leakage

specifications without active cooling. Give special care to the

printed circuit board (PCB) layout to minimize leakage currents

between PCB traces. Improper layout and board handling may

generate leakage currents exceeding the bias currents of the

operational amplifier.

The ADA4610-1/ADA4610-2/ADA4610-4 are fully specified with

supply voltages from ±5 V to ±15 V over the extended industrial

temperature range of −40°C to +125°C. The ADA4610-1 is

available in an 8-lead SOIC. The ADA4610-2 is available in an

8-lead MSOP, an 8-lead SOIC, and an 8-lead LFCSP. The

ADA4610-4 is available in a 14-lead SOIC and a 16-lead

LFCSP. All these packages are surface-mount type.

+ –

D31

Q28

Q27

VOUT

V–

Q15

Q14

Q13

Q17

Q16

Q23

Q29

Q30

Q25

Q24

Q18

Q12

DE1

VIN+

VIN–

R16

R10

R11

RC4

D26

R15

V+

DE5

DE6

DE3

DE2

DE4

Figure 57. Simplified Schematic

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