Overview
The AD8557ACPZ-REEL7, 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 to a well-defined output voltage range. The AD8557 utilizes Analog Devices' proprietary low noise auto-zero and DigiTrim® technologies to ensure high accuracy and reliability. It operates from single-supply voltages of 2.7 V to 5.5 V and is available in both 8-lead SOIC and 4 mm × 4 mm, 16-lead LFCSP packages.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Offset Voltage | VOS | - | 2 | 12 | μV |
| Input Offset Voltage Drift | TCVOS | - | 27 | 65 | nV/°C |
| Input Bias Current | IB | 10 | 18 | 25 | nA |
| Input Offset Current | IOS | 1 | 4 | - | nA |
| Input Voltage Range | - | 0.6 | - | 3.8 | V |
| Common-Mode Rejection Ratio (CMRR) | CMRR | - | 75 | 85 | dB (AV = 28) |
| Common-Mode Rejection Ratio (CMRR) | CMRR | - | 96 | 112 | dB (AV = 1300) |
| Gain Range | - | 28 | - | 1300 | - |
| Operating Voltage Range | - | 2.7 | - | 5.5 | V |
| Operating Temperature Range | - | -40 | - | 125 | °C |
Key Features
- Digitally programmable gain from 28 to 1300 through a serial data interface.
- Digitally programmable output offset voltage, ratiometric to the supply voltage.
- Extremely low input offset voltage and input offset voltage drift.
- High dc and ac Common-Mode Rejection Ratio (CMRR).
- Pull-up current source at the input pins and pull-down current source at the VCLAMP pin.
- Output clamping set via an external reference voltage to safely drive lower voltage analog-to-digital converters (ADCs).
- Stable with any capacitive load.
- Available in 8-lead SOIC and 4 mm × 4 mm, 16-lead LFCSP packages.
- 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 AD8557ACPZ-REEL7 used for?
The AD8557ACPZ-REEL7 is used for precise and flexible signal processing, particularly in converting variable pressure sensor and strain bridge outputs to a well-defined output voltage range.
- What is the gain range of the AD8557?
The gain of the AD8557 is digitally programmable from 28 to 1300.
- What are the key features of the AD8557's input stage?
The AD8557 features extremely low input offset voltage, low input offset voltage drift, high CMRR, and includes pull-up and pull-down current sources.
- What are the operating voltage and temperature ranges of the AD8557?
The AD8557 operates from single-supply voltages of 2.7 V to 5.5 V and is fully specified from −40°C to +125°C.
- In what packages is the AD8557 available?
The AD8557 is available in 8-lead SOIC and 4 mm × 4 mm, 16-lead LFCSP packages.
- How is the output offset voltage adjusted in the AD8557?
The output offset voltage is digitally programmable and ratiometric to the supply voltage.
- What is the significance of the DigiTrim® technology in the AD8557?
The DigiTrim® technology allows for precise and reliable adjustment of gain and offset, ensuring high accuracy and field reliability.
- Can the AD8557 drive lower voltage analog-to-digital converters (ADCs)?
- What are some common applications of the AD8557?
- Is the AD8557 qualified for automotive applications?
