Overview
The AD8556ARZ-REEL7, produced by Analog Devices Inc., is a digitally programmable sensor signal amplifier designed to convert variable pressure sensor and strain bridge outputs into a well-defined output voltage range. This amplifier incorporates advanced technologies such as low noise, auto-zero, and DigiTrim® to provide an incredibly accurate and flexible signal processing solution in a compact footprint. It operates over a wide temperature range from −40°C to +140°C and is available in 8-lead SOIC_N and 16-lead LFCSP_WQ packages.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Offset Voltage | VOS | −40°C ≤ TA ≤ +125°C | 2 | 10 | 12 | µV |
| Input Offset Voltage Drift | TCVOS | −40°C ≤ TA ≤ +125°C | 65 | nV/°C | ||
| Common Mode Rejection Ratio (CMRR) | CMRR | AV = 70 | 94 | dB | ||
| Supply Current | ISY | −40°C ≤ TA ≤ +125°C, VO = 2.5 V, VPOS = VNEG = 2.5 V | 2.0 | 2.7 | 2.78 | mA |
| Power Supply Rejection Ratio (PSRR) | PSRR | AV = 70 | 109 | 125 | dB | |
| Supply Voltage | VDD | 4.5 | 5.5 | V | ||
| Gain Bandwidth Product (GBP) | GBP | First gain stage, TA = 25°C | 2 | MHz | ||
| Output Buffer Slew Rate | SR | AV = 70, RL = 10 kΩ, CL = 100 pF, TA = 25°C | 1.2 | V/µs |
Key Features
- Digitally programmable gain from 70 to 1280 through a single-wire serial interface.
- Digitally programmable output offset voltage, ratiometric to the supply voltage.
- Internal EMI filters on input pins and VCLAMP pin.
- Low input offset voltage and low input offset voltage drift.
- High common mode rejection ratio (CMRR) of 94 dB minimum.
- Open and short wire fault detection.
- Low-pass filtering via a single external capacitor.
- Output clamping set via an external reference voltage.
- Stable operation with any capacitive load.
- Operating temperature range from −40°C to +140°C.
Applications
- Pressure and position sensors.
- Precision current sensing.
- Strain gages.
Q & A
- What is the operating temperature range of the AD8556?
The AD8556 operates over a temperature range from −40°C to +140°C.
- What is the range of digitally programmable gain for the AD8556?
The gain is digitally programmable from 70 to 1280.
- What type of filters are included in the AD8556?
The AD8556 includes internal EMI filters on the input pins and VCLAMP pin.
- How is the output offset voltage adjusted in the AD8556?
The output offset voltage is digitally programmable and is ratiometric to the supply voltage.
- What is the common mode rejection ratio (CMRR) of the AD8556?
The CMRR is 94 dB minimum.
- Does the AD8556 support fault detection?
Yes, it includes open and short wire fault detection.
- How is low-pass filtering implemented in the AD8556?
Low-pass filtering is implemented via a single external capacitor.
- What is the supply voltage range for the AD8556?
The supply voltage range is from 4.5 V to 5.5 V.
- What are the package options for the AD8556?
The AD8556 is available in 8-lead SOIC_N and 16-lead LFCSP_WQ packages.
- What are some typical applications of the AD8556?
Typical applications include pressure and position sensors, precision current sensing, and strain gages.
