AD8556 Digitally Programmable Sensor Signal Amplifier with EMI Filters

Applications

The AD8556 is a zero-drift, sensor signal amplifier with digitally programmable gain and output offset. Designed to easily and accurately convert variable pressure sensor and strain bridge outputs to a well-defined output voltage range, the AD8556 accurately amplifies many other differential or single-ended sensor outputs. The AD8556 uses the ADI patented low noise auto-zero and DigiTrim® technologies to create an incredibly accurate and flexible signal processing solution in a very compact footprint.

Gain is digitally programmable in a wide range from 70 to 1,280 through a serial data interface. Gain adjustment can be fully simulated in-circuit and then permanently programmed with reliable polyfuse technology. Output offset voltage is also digitally programmable and is ratiometric to the supply voltage. AD8556 also features internal EMI filters on the VNEG, VPOS, FILT and VCLAMP pins.

In addition to extremely low input offset voltage, low input offset voltage drift, and very high dc and ac CMRR, the AD8556 also includes a pull-up current source at the input pins and a pull-down current source at the VCLAMP pin. This allows open wire and shorted wire fault detection. A low-pass filter function is implemented via a single low cost external capacitor. Output clamping set via an external reference voltage allows the AD8556 to drive lower voltage ADCs safely and accurately.

When used in conjunction with an ADC referenced to the same supply, the system accuracy becomes immune to normal supply voltage variations. Output offset voltage can be adjusted with a resolution of better than 0.4% of the difference between VDD and VSS. A lockout trim after gain and offset adjustment further ensures field reliability.

The AD8556 is fully specified from −40°C to +140°C. Operating from single-supply voltages of 2.7 V to 5.5 V, the AD8556 is offered in the 8-lead SOIC_N, and 4 mm × 4 mm 16-lead LFCSP_VQ.

Features and Benefits
  • EMI filters at input pins
  • Specified from −40°C to +140°C
  • Low offset voltage: 10 μV maximum
  • Low input offset voltage drift: 65 nV/°C maximum
  • High CMRR: 94 dB minimum
  • Digitally programmable gain and output offset voltage
  • Programmable output clamp voltage
  • Open and short wire fault detection
  • Low-pass filtering
  • Single-wire serial interface
  • Stable with any capacitive load
  • SOIC_N and LFCSP_VQ packages
  • 4.5 V to 5.5 V operation
  • Amplifiers
    Automotive
    • Powertrain Body and Chassis
    Data Sheets
    Documentnote
    AD8556: Digitally Programmable Sensor Signal Amplifier with EMI Filters Data Sheet (Rev. B)PDF 770 kB
    Technical Books
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD8556ACPZ-R2 Production16 ld LFCSP (4x4mm, 2.35mm exposed pad) REEL 250-40 to 140C4.774.77Y
    AD8556ACPZ-REEL Obsolete16 ld LFCSP (4x4mm, 2.35mm exposed pad) REEL 5000-40 to 140C00Y
    AD8556ACPZ-REEL7 Production16 ld LFCSP (4x4mm, 2.35mm exposed pad) REEL 1500-40 to 140C02.92Y
    AD8556ARZ Production8 ld SOICOTH 98-40 to 140C3.782.88Y
    AD8556ARZ-REEL Production8 ld SOICREEL 2500-40 to 140C02.88Y
    AD8556ARZ-REEL7 Production8 ld SOICREEL 1000-40 to 140C02.88Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    AD8556CP-EBZEvaluation Board for 16 Lead AD8556/57 LFCSP195Y
    AD8556-EVALZEvaluatiion Board for 8 Lead AD8555/AD8556/AD8557195Y
    Reference Materials
    AD8556: Digitally Programmable Sensor Signal Amplifier with EMI Filters Data Sheet (Rev. B) ad8556
    AD8556参考代码 ad8556
    Auto-Zero Amplifiers ad693