ADA4610-1ARJZ-R2 datasheet(20/27 Pages) AD

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ADA4610-1/ADA4610-2/ADA4610-4

Data Sheet

Rev. I | Page 20 of 27

THEORY OF OPERATION

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 2 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. Ensure proper printed circuit board (PCB) layout to

minimize leakage currents between PCB traces. Improper layout

and board handling can 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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