Alternative Parts

Overview

Features and Benefits

  • Integrated bipolar charge pump
    • Simplified isolation requirements
    • Wide input range on low voltage supplies
  • Dedicated output amplifier supplies for ADC protection
  • Low power: 83 mW (DVDD = 3 V, VDDCP = 5 V)
  • 36 precision gains from 1/16 V/V to 176 V/V
  • Robust ±60 V protected 2:1 input multiplexer
  • Low input bias current: ±1.5 nA maximum at TA = 25°C
  • Integrated input EMI filtering
  • 7 GPIOx ports with special functions
  • Sequential chip select mode
  • Excellent dc precision
    • Low input offset voltage: ±14 µV maximum
    • Low input offset voltage drift: ±0.08 µV/°C maximum
    • Gain calibration via internal memory
    • Low gain drift: ±1 ppm/°C maximum
    • High CMRR: 111 dB minimum, G = 1 V/V
  • Excitation current source
  • SPI port with checksum (CRC) support
  • Internal/external fault detection
  • Compact 28-lead, 5 mm × 5 mm LFCSP
  • Specified temperature range: −40°C to +105°C

Product Details

The ADA4255 is a precision programmable gain instrumentation amplifier (PGIA) with integrated bipolar charge pumps. With its integrated charge pumps, the ADA4255 internally produces the high voltage bipolar supplies needed to achieve a wide input voltage range (38 V typical with VDDCP = 5 V) without lowering input impedance. The charge pump topology of the ADA4255 allows channels to be isolated with only low voltage components, reducing complexity, size, and implementation time in industrial and process control systems.

The zero drift PGIA topology of the ADA4255 self calibrates dc errors and lower frequency 1/f noise, achieving excellent dc precision over the entire specified temperature range. The combination of 36 precision gains ranging from 1/16 V/V to 176 V/V within the ADA4255 and high voltage, high impedance inputs allow a wide range of inputs to be scaled to the range of the analog-to-digital converter (ADC). By integrating all gain setting and level shifting resistors, the ADA4255 achieves excellent common-mode rejection ratio (CMRR) performance (111 dB minimum at G = 1 V/V) and extremely low gain drift (±1 ppm/°C maximum). This high level of precision maximizes dynamic range and greatly reduces calibration requirements in many applications.

The ±60 V input protection, integrated electromagnetic interference (EMI) filtering and various safety features make the ADA4255 an ideal choice for robust industrial systems. Seven general-purpose input and output (GPIOx) pins, which can be configured to provide various special functions, are included in the ADA4255. An excitation current source output is available to bias sensors such as resistance temperature detectors (RTDs).

The ADA4255 is specified over the −40°C to +105°C temperature range and is offered in a compact 5 mm × 5 mm, 28-lead LFCSP.

APPLICATIONS

  • Universal process control front ends
  • Data acquisition systems
  • Test and measurement systems
  • System power monitoring

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

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Product Recommendations

ADA4255 Companion Parts

Design Resources

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Evaluation Boards Pricing displayed is based on 1-piece.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.