ALLGEMEINE BESCHREIBUNG

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, combined 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 instrumentation, 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 8-lead MSOP, and the popular 8-lead, narrow SOIC, RoHS compliant packages. MSOP packaged devices are only available in tape and reel format.

For the dual version of this ultraprecision, rail-to-rail op amp, see the AD8676 data sheet.

The AD8675 and AD8676 are members of a growing series of low noise op amps offered by Analog Devices, Inc.

 

FEATURES

Very low voltage noise: 2.8 nV/√Hz

Rail-to-Rail-Ausgangsschwingung

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

 

ANWENDUNGEN

Precision instrumentation

PLL filters

Laser diode control loops

Dehnungsmessstreifen-Verstärker

Medizinische Instrumentierung

Thermoelement-Verstärker

 

ABSOLUTE HÖCHSTWERTE

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

WÄRMEBESTÄNDIGKEIT

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages and measured using a standard 4-layer board, unless otherwise specified.

Table 5. Thermal Resistance

Package Type θJA θJA Unit
8-Lead MSOP (RM-8) 142 45 °C/W
8-Lead SOIC_N (R-8) 120 45 °C/W

POWER SEQUENCING

Establish the op amp supplies simultaneously with, or before, any input signals are applied. If this is not possible, the input current must be limited to 10 mA.

ESD CAUTION

ESD(electrostatic discharge)sensitive device. Charged devices and circuit boards can discharge without detection.Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore,proper ESD precautions should be taken to avoid performance degradation or loss of functionality,.