Overview
The AD8557ARZ, produced by Analog Devices Inc., is a zero drift, sensor signal amplifier designed for precise and flexible signal processing. It features digitally programmable gain and output offset, making it ideal for converting variable pressure sensor and strain bridge outputs into well-defined output voltage ranges. The AD8557 utilizes Analog Devices' proprietary low noise auto-zero and DigiTrim® technologies to ensure high accuracy and reliability in a compact footprint.
Key Specifications
| Parameter | Value |
|---|---|
| Input Offset Voltage | 12 μV maximum over temperature |
| Input Offset Voltage Drift | 65 nV/°C maximum |
| Common-Mode Rejection Ratio (CMRR) | 96 dB minimum |
| Gain Range | 28 to 1300 |
| Supply Voltage | 2.7 V to 5.5 V |
| Operating Temperature | −40°C to +125°C |
| Package Types | 8-lead SOIC, 16-lead LFCSP (4 mm × 4 mm) |
| Output Offset Voltage Adjustment | Digitally programmable, ratiometric to supply voltage |
| Output Clamping | Set via external reference voltage |
Key Features
- Digitally programmable gain and output offset voltage through a single-wire serial interface.
- Extremely low input offset voltage and input offset voltage drift.
- Very high dc and ac CMRR (Common-Mode Rejection Ratio).
- Includes pull-up current source at input pins and pull-down current source at VCLAMP pin.
- Output clamping to drive lower voltage analog-to-digital converters (ADCs) safely and accurately.
- Lockout trim after gain and offset adjustment for field reliability.
- Qualified for automotive applications.
Applications
- Automotive sensors.
- Pressure and position sensors.
- Precision current sensing.
- Thermocouple amplifiers.
- Industrial weigh scales.
- Strain gages.
Q & A
- What is the AD8557ARZ used for? The AD8557ARZ is used for precise amplification of sensor signals, particularly in applications involving pressure sensors, strain bridges, and thermocouples.
- What are the key features of the AD8557ARZ? Key features include digitally programmable gain and output offset, low input offset voltage, high CMRR, and output clamping capabilities.
- What is the operating voltage range of the AD8557ARZ? The AD8557ARZ operates from single-supply voltages of 2.7 V to 5.5 V.
- What are the available package types for the AD8557ARZ? The AD8557ARZ is available in 8-lead SOIC and 16-lead LFCSP (4 mm × 4 mm) packages.
- How is the gain adjusted in the AD8557ARZ? Gain is adjusted through a single-wire serial interface and can be permanently programmed using polyfuse technology.
- What is the temperature range for the AD8557ARZ? The AD8557ARZ is fully specified from −40°C to +125°C.
- Is the AD8557ARZ suitable for automotive applications? Yes, the AD8557ARZ is qualified for automotive applications.
- How does the AD8557ARZ ensure field reliability? The AD8557ARZ ensures field reliability through a lockout trim after gain and offset adjustment.
- What is the common-mode rejection ratio (CMRR) of the AD8557ARZ? The CMRR of the AD8557ARZ is 96 dB minimum.
- Can the AD8557ARZ drive lower voltage ADCs? Yes, the AD8557ARZ can drive lower voltage ADCs safely and accurately through output clamping set via an external reference voltage.
