Overview
The ADA4255ACPZ from Analog Devices Inc. is a precision programmable gain instrumentation amplifier (PGIA) designed for high-precision applications. It features an integrated bipolar charge pump, which simplifies isolation requirements and allows for a wide input voltage range without compromising input impedance. This amplifier is particularly suited for industrial and process control systems due to its ability to self-calibrate DC errors and lower frequency 1/f noise, ensuring excellent DC precision over the entire specified temperature range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Low Voltage Charge Pump Supply (VDDCP) | - | 5 | - | V |
| Low Voltage Analog Output Amplifier Supply (DVDD) | - | 3 | - | V |
| Power Consumption (DVDD = 3 V, VDDCP = 5 V) | - | 83 | - | mW |
| Precision Gains | 1/16 | - | 176 | V/V |
| Input Offset Voltage | - | - | - | Low (specified in datasheet) |
| Common-Mode Rejection Ratio (CMRR) at G = 1 V/V | 111 | - | - | dB |
| Gain Drift | - | - | ±1 ppm/°C | - |
| Internal/External Clock Frequency | 0.8 | 1 | 1.2 | MHz |
Key Features
- Integrated bipolar charge pump for simplified isolation requirements and wide input voltage range.
- 36 precision gains ranging from 1/16 V/V to 176 V/V.
- Low power consumption: 83 mW (DVDD = 3 V, VDDCP = 5 V).
- Excellent DC precision with low input offset voltage and low gain drift (±1 ppm/°C).
- High common-mode rejection ratio (CMRR) of 111 dB minimum at G = 1 V/V.
- Dedicated output amplifier supplies for ADC protection.
- Robust ±60 V protected 2:1 input multiplexer.
- Sequential Chip Select (SCS) and wire break detection capabilities.
- SPI digital interface for configuration and control.
Applications
- Industrial and process control systems.
- Programmable Logic Controller (PLC) voltage and current input.
- 3-Wire RTD with current excitation.
- High rail current sensing.
- Analog-to-digital converter (ADC) interfaces.
Q & A
- What is the ADA4255ACPZ?
The ADA4255ACPZ is a precision programmable gain instrumentation amplifier (PGIA) produced by Analog Devices Inc.
- What are the key features of the ADA4255ACPZ?
Key features include an integrated bipolar charge pump, 36 precision gains, low power consumption, excellent DC precision, and high CMRR.
- What is the power consumption of the ADA4255ACPZ?
The power consumption is 83 mW when DVDD = 3 V and VDDCP = 5 V.
- What are the precision gains available on the ADA4255ACPZ?
The ADA4255ACPZ offers 36 precision gains ranging from 1/16 V/V to 176 V/V.
- What is the common-mode rejection ratio (CMRR) of the ADA4255ACPZ?
The CMRR is 111 dB minimum at G = 1 V/V.
- What are the typical applications of the ADA4255ACPZ?
Typical applications include industrial and process control systems, PLC voltage and current input, 3-Wire RTD with current excitation, and high rail current sensing.
- Does the ADA4255ACPZ have built-in protection features?
Yes, it includes a robust ±60 V protected 2:1 input multiplexer and dedicated output amplifier supplies for ADC protection.
- How is the ADA4255ACPZ configured and controlled?
The ADA4255ACPZ uses an SPI digital interface for configuration and control.
- What is the internal/external clock frequency range of the ADA4255ACPZ?
The internal/external clock frequency range is from 0.8 MHz to 1.2 MHz.
- Does the ADA4255ACPZ support wire break detection?
Yes, it supports wire break detection.
