ADA4077-2ARZ-R7 datasheet(21/25 Pages) AD

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Data Sheet

ADA4077-1/ADA4077-2/ADA4077-4

Rev. D | Page 21 of 25

THEORY OF OPERATION

The ADA4077-1, ADA4077-2, and ADA4077-4 are the sixth

generation of the Analog Devices, Inc., industry-standard OP07

amplifier family. The ADA4077-1, ADA4077-2, and ADA4077-4

are high precision, low noise operational amplifiers with a

combination of extremely low offset voltage and very low input

bias currents. Unlike JFET amplifiers, the low bias and offset

currents are relatively insensitive to ambient temperatures, even

up to 125°C.

The Analog Devices proprietary process technology and linear

design expertise have produced a high voltage amplifier with

superior performance to the OP07, OP77, OP177, and OP1177

in tiny, 8-lead SOIC and 8-lead MSOP packages (ADA4077-1

and ADA4077-2) and 14-lead TSSOP and 14-lead SOIC packages

(ADA4077-4). Despite their small size, the ADA4077-1,

ADA4077-2, and ADA4077-4 offer numerous improvements,

including low wideband noise, wide bandwidth, lower offset and

offset drift, lower input bias current, and complete freedom from

phase inversion.

The ADA4077-1, ADA4077-2, and ADA4077-4 have a specified

operating temperature range of −40°C to +125°C with an MSL1

rating, which is as wide as any similar device in a plastic surface-

mount package. This MSL1 rating is increasingly important as

printed circuit board (PCB) and overall system sizes continue to

shrink, causing internal system temperatures to rise.

In the ADA4077-1, ADA4077-2, and the ADA4077-4, the power

consumption is reduced by a factor of four compared to the OP177,

and the bandwidth and slew rate are both increased by a factor

of six. The low power dissipation and very stable performance

vs. temperature also reduce warmup drift errors to insignificant

levels.

Inputs are protected internally from overvoltage conditions

referenced to either supply rail. Like any high performance

amplifier, maximum performance is achieved by following

appropriate circuit and PCB guidelines.

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