Overview
The AD628ARZ from Analog Devices Inc. is a high-performance, precision difference amplifier designed to handle high common-mode input voltages and provide excellent dc and ac performance. This device is particularly suited for applications requiring the measurement and scaling of high voltages, such as those found in industrial control systems, power supply monitoring, and sensor signal conditioning. The AD628ARZ operates over a wide range of supply voltages, including both single and dual supply configurations, and is available in an 8-lead SOIC package.
Key Specifications
| Parameter | Specification |
|---|---|
| Input Common Mode Voltage Range | ±120 V at VS = ±15 V |
| Gain Range | 0.1 to 100 |
| Supply Voltage Range | Dual: ±2.25 V to ±18 V, Single: 4.5 V to 36 V |
| Operating Temperature Range | -40°C to +85°C |
| Input Bias Current | 1.5 nA maximum |
| Common Mode Rejection Ratio (CMRR) | 75 dB minimum (dc to 500 Hz, G = +1) |
| Offset Voltage vs Temperature | 8 μV/°C maximum |
| Offset Voltage Range | ±1.5 mV maximum |
| Quiescent Current | 1.6 mA maximum at TA = 25°C, VS = ±15 V, RL = 2 kΩ |
| Package Style | 8-lead SOIC-N |
Key Features
- High common-mode input voltage range of ±120 V at VS = ±15 V
- Programmable gain from 0.1 to 100
- Excellent ac and dc performance with high common-mode rejection ratio (CMRR) of 75 dB minimum
- Low input bias current of 1.5 nA maximum
- Operating temperature range of -40°C to +85°C
- Single and dual supply operation: 4.5 V to 36 V and ±2.25 V to ±18 V respectively
- Remote Kelvin connection capability through the inverting input of the buffer amplifier
- Low-pass filter capability using an external capacitor
Applications
- High voltage current shunt sensing
- Programmable logic controllers (PLCs)
- Analog input front-end signal conditioning for various control voltages and currents (e.g., +5V, +10V, ±5V, ±10V, and 4 to 20mA)
- Isolation and sensor signal conditioning
- Power supply monitoring
- Electrohydraulic controls and motor controls
- Battery voltage monitoring and charging systems
Q & A
- What is the input common-mode voltage range of the AD628ARZ?
The input common-mode voltage range of the AD628ARZ is ±120 V at VS = ±15 V.
- What is the gain range of the AD628ARZ?
The gain range of the AD628ARZ is from 0.1 to 100.
- What are the supply voltage ranges for the AD628ARZ?
The AD628ARZ can operate with single supply voltages from 4.5 V to 36 V and dual supply voltages from ±2.25 V to ±18 V.
- What is the operating temperature range of the AD628ARZ?
The operating temperature range of the AD628ARZ is -40°C to +85°C.
- What is the input bias current of the AD628ARZ?
The input bias current of the AD628ARZ is 1.5 nA maximum.
- What is the common-mode rejection ratio (CMRR) of the AD628ARZ?
The CMRR of the AD628ARZ is 75 dB minimum (dc to 500 Hz, G = +1).
- Can the AD628ARZ be used for remote Kelvin connections?
- What types of applications is the AD628ARZ suitable for?
The AD628ARZ is suitable for high voltage current shunt sensing, PLCs, analog input front-end signal conditioning, isolation and sensor signal conditioning, power supply monitoring, electrohydraulic controls, and motor controls.
- How does the AD628ARZ handle high voltage measurements?
The AD628ARZ is well-suited for high voltage measurements across a shunt resistor due to its high common-mode input impedance and the ability to attenuate high voltage signals.
- What package styles are available for the AD628ARZ?
The AD628ARZ is available in an 8-lead SOIC-N package).
