36 V Precision, 2.8 nV/√Hz

Rail-to-Rail Output Op Amp

AD8675

Rev. 0

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FEATURES

Very low voltage noise 2.8 nV/√Hz

Rail-to-rail output swing

Low input bias current: 2 nA maximum

Very low offset voltage: 75 μV maximum

Low input offset drift: 0.6 μV/°C maximum

Very high gain: 120 dB

Wide bandwidth: 10 MHz typical

±5 V to ±18 V operation

APPLICATIONS

Precision instrumentation

PLL filters

Laser diode control loops

Strain gage amplifiers

Medical instrumentation

Thermocouple amplifiers

PIN CONFIGURATIONS

–IN

2

+IN

3

V–

4

NULL

8

V+

7

OUT

6

NC

5

NC = NO CONNECT

AD8675

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead SOIC_N (R-8)

–IN

2

+IN

3

V–

4

NULL

8

V+

7

OUT

6

NC

5

NC = NO CONNECT

AD8675

TOP VIEW

(Not to Scale)

Figure 2. 8-Lead MSOP (RM-8)

GENERAL DESCRIPTION

The AD8675 precision operational amplifier has ultralow offset,

drift, and voltage noise combined with very low input bias

currents over the full operating temperature range. The AD8675

is a precision, wide bandwidth op amp featuring rail-to-rail

output swings and very low noise. Operation is fully specified

from ±5 V to ±15 V.

The AD8675 features a rail-to-rail output like that of the OP184,

but with wide bandwidth and even lower voltage noise, com-

bined with the precision and low power consumption like that

of the industry-standard OP07 amplifier. Unlike other low

noise, rail-to-rail op amps, the AD8675 has very low input bias

current and low input current noise.

With typical offset voltage of only 10 μV, offset drift of 0.2 μV/°C,

and noise of only 0.10 μV p-p (0.1 Hz to 10 Hz), the AD8675 is

perfectly suited for applications where large error sources

cannot be tolerated. For applications with even lower offset

tolerances, the proprietary nulling capability allows a combination

of both device and system offset errors up to 3.5 mV (referred

to the input) to be compensated externally. Unlike previous

circuits, the AD8675 accommodates this adjustment without

adversely affecting the offset drift, CMRR, and PSRR of the

amplifier. Precision instrumentation, PLL, and other precision

filter circuits, position and pressure sensors, medical instru-

mentation, and strain gage amplifiers benefit greatly from the

very low noise, low input bias current, and wide bandwidth.

Many systems can take advantage of the low noise, dc precision,

and rail-to-rail output swing provided by the AD8675 to

maximize SNR and dynamic range.

The smaller packages and low power consumption afforded by

the AD8675 allow maximum channel density or minimum

board size for space-critical equipment.

The AD8675 is specified for the extended industrial temperature

range (−40°C to +125°C). The AD8675 amplifier is available in

the tiny MSOP-8, and the popular 8-lead, narrow SOIC, lead-

free packages. MSOP packaged devices are only available in tape

and reel format.