Overview
The AD8479ARZ from Analog Devices Inc. is a precision difference amplifier designed to accurately measure differential signals in the presence of high common-mode voltages. This device is capable of handling common-mode voltages up to ±600 V, making it ideal for applications that require high voltage tolerance without the need for galvanic isolation. The AD8479ARZ operates over a wide power supply range of ±2.5 V to ±18 V and features excellent AC specifications, including a high common-mode rejection ratio (CMRR) and low offset voltage drift. It is available in an 8-lead SOIC package and is operational over a temperature range of −40°C to +125°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range | ±2.5 | - | ±18 | V |
| Supply Current (VOUT = 0 V) | 550 | 650 | 850 | μA |
| Common-Mode Voltage Range | - | - | ±600 | V |
| Bandwidth | - | 310 | - | kHz |
| CMRR (Minimum) | 90 | - | - | dB |
| Gain Nonlinearity (Maximum) | - | - | ±5 ppm | - |
| Offset Voltage Drift (Maximum) | - | - | ±10 µV/°C | - |
| Gain Drift (Maximum) | - | - | ±5 ppm/°C | - |
| Temperature Range | -40 | - | 125 | °C |
Key Features
- Fixed gain of 1
- Wide power supply range of ±2.5 V to ±18 V
- Low supply current of 550 μA typical
- Excellent AC specifications, including high CMRR and low noise
- High accuracy DC performance with low offset voltage and gain drift
- Inputs protected from common-mode or differential mode transients up to ±600 V
- Space-saving 8-lead SOIC package
Applications
- High voltage current sensing
- Battery cell voltage monitors
- Power supply current monitors
- Motor controls
- Isolation applications where galvanic isolation is not required
Q & A
- What is the common-mode voltage range of the AD8479ARZ? The AD8479ARZ can handle common-mode voltages up to ±600 V.
- What is the operating temperature range of the AD8479ARZ? The device operates over a temperature range of −40°C to +125°C.
- What is the typical supply current of the AD8479ARZ? The typical supply current is 550 μA.
- What is the bandwidth of the AD8479ARZ? The bandwidth is 310 kHz.
- What is the CMRR of the AD8479ARZ? The minimum CMRR is 90 dB.
- What are the key applications of the AD8479ARZ? Key applications include high voltage current sensing, battery cell voltage monitors, power supply current monitors, and motor controls.
- What package type is the AD8479ARZ available in? The AD8479ARZ is available in an 8-lead SOIC package.
- Does the AD8479ARZ require galvanic isolation? No, the AD8479ARZ does not require galvanic isolation.
- What is the gain nonlinearity of the AD8479ARZ? The maximum gain nonlinearity is ±5 ppm.
- What is the offset voltage drift of the AD8479ARZ? The maximum offset voltage drift is ±10 µV/°C.
