5962-87719012A

可编程增益仪表放大器器 Programmable Gain Instrumentation Amplifier

Product Details

The AD625 is a precision instrumentation amplifier specifically designed to fulfill two major areas of application: 1 Circuits requiring nonstandard gains i.e., gains not easily achievable with devices such as the AD524 and AD624. 2 Circuits requiring a low cost, precision software programmable gain amplifier.

For low noise, high CMRR, and low drift the AD625JN is the most cost effective instrumentation amplifier solution available. An additional three resistors allow the user to set any gain from 1 to 10,000. The error contribution of the AD625JN is less than 0.05% gain error and under 5 ppm/°C gain TC; performance limitations are primarily determined by the external resistors. Common-mode rejection is independent of the feedback resistor matching.

A software programmable gain amplifier SPGA can be configured with the addition of a CMOS multiplexer or other switch network, and a suitable resistor network. Because the ON resistance of the switches is removed from the signal path, an AD625 based SPGA will deliver 12-bit precision, and can be programmed for any set of gains between 1 and 10,000, with completely user selected gain steps.

For the highest precision the AD625C offers an input offset voltage drift of less than 0.25 µV/°C, output offset drift below 15 µV/°C, and a maximum nonlinearity of 0.001% at G = 1. All grades exhibit excellent ac performance; a 25 MHz gain bandwidth product, 5 V/µs slew rate and 15 µs settling time.

The AD625 is available in three accuracy grades A, B, C for industrial -40°C to +85°C temperature range, two grades J, K for commercial 0°C to +70°C temperature range, and one S grade rated over the extended -55°C to +125°C temperature range.

### Features and Benefits

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User Programmed Gains of 1 to 10,000

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Low Gain Error: 0.02% Max

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Low Gain TC: 5 ppm/°C Max

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Low Nonlinearity: 0.001% Max

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Low Offset Voltage: 25 µV

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Low Noise 4 nV/√Hz at 1 kHz RTI

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MIL-Standard Parts Available

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Gain Bandwidth Product: 25 MHz

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16-Lead Ceramic or Plastic DIP

Package, 20-Terminal LCC Package

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Standard Military Drawing Available

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Low Cost