Overview
The AD8556ARZ-REEL, produced by Analog Devices Inc., is a zero-drift, sensor signal amplifier designed to accurately convert variable pressure sensor and strain bridge outputs to a well-defined output voltage range. This amplifier utilizes Analog Devices' patented low noise, auto-zero, and DigiTrim® technologies to provide an incredibly accurate and flexible signal processing solution in a compact footprint. It operates from single-supply voltages of 4.5 V to 5.5 V and is fully specified from −40°C to +140°C, making it suitable for a wide range of applications, including automotive sensors, pressure and position sensors, precision current sensing, and strain gages.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Offset Voltage | VOS | −40°C ≤ TA ≤ +125°C | 2 | 10 | µV | |
| Input Offset Voltage Drift | VOS Drift | −40°C ≤ TA ≤ +125°C | 65 | nV/°C | ||
| Common Mode Rejection Ratio (CMRR) | CMRR | 94 | dB | |||
| Supply Current | ISY | −40°C ≤ TA ≤ +125°C, VO = 2.5 V, VPOS = VNEG = 2.5 V, VDAC code = 128 | 2.0 | 2.7 | mA | |
| Power Supply Rejection Ratio (PSRR) | PSRR | AV = 70 | 109 | 125 | dB | |
| 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 | ||
| Supply Voltage | VDD | 4.5 | 5.0 | 5.5 | V |
Key Features
- EMI filters at input pins
- 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 via a single external capacitor
- Single-wire serial interface
- Stable with any capacitive load
- Available in SOIC_N and LFCSP_WQ packages
Applications
- Automotive Sensors
- Pressure and Position Sensors
- Precision Current Sensing
- Strain Gages
Q & A
- What is the operating temperature range of the AD8556ARZ-REEL?
The AD8556ARZ-REEL is fully specified from −40°C to +140°C.
- What are the key technologies used in the AD8556ARZ-REEL?
The AD8556ARZ-REEL uses Analog Devices' patented low noise, auto-zero, and DigiTrim® technologies.
- What is the range of digitally programmable gain for the AD8556ARZ-REEL?
The gain is digitally programmable in a wide range from 70 to 1280.
- How does the AD8556ARZ-REEL handle EMI?
The AD8556ARZ-REEL features internal EMI filters at the input pins.
- What types of fault detection does the AD8556ARZ-REEL support?
The AD8556ARZ-REEL supports open wire and shorted wire fault detection.
- How is the output offset voltage adjusted in the AD8556ARZ-REEL?
The output offset voltage is digitally programmable and is ratiometric to the supply voltage.
- What is the purpose of the low-pass filter function in the AD8556ARZ-REEL?
The low-pass filter function is implemented via a single low-cost external capacitor to filter out high-frequency noise.
- What are the available package options for the AD8556ARZ-REEL?
The AD8556ARZ-REEL is available in 8-lead SOIC_N and 4 mm × 4 mm 16-lead LFCSP_WQ packages.
- How does the AD8556ARZ-REEL ensure field reliability?
A lockout trim after gain and offset adjustment further ensures field reliability.
- What is the supply voltage range for the AD8556ARZ-REEL?
The AD8556ARZ-REEL operates from single-supply voltages of 4.5 V to 5.5 V.
