Overview
The AD629BR, produced by Analog Devices Inc., is a high common-mode voltage difference amplifier. This precision device is designed to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V. It is particularly useful in applications where galvanic isolation is not required, offering a cost-effective alternative to isolation amplifiers. The AD629BR operates over a wide power supply range of ±2.5 V to ±18 V and features low offset, low offset drift, and low gain error drift, along with excellent common-mode rejection ratio (CMRR) over a wide frequency range.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| GAIN | VOUT = ±10 V, RL = 2 kΩ | 1 | 1 | 1 | V/V |
| Gain Error | VOUT = ±10 V, RL = 2 kΩ | 0.01 | 0.05 | 0.03 | % |
| Gain Nonlinearity | RL = 2 kΩ | 4 | 10 | 3 | ppm |
| Gain vs. Temperature | TA = TMIN to TMAX | 3 | 10 | 10 | ppm/°C |
| Offset Voltage | VS = ±5 V | 0.2 | 1 | 0.5 | mV |
| Offset Drift | TA = TMIN to TMAX | 6 | 20 | 3 | µV/°C |
| Common-Mode Rejection Ratio (CMRR) | @ 500 Hz | 77 | - | 86 | dB |
| Bandwidth | - | - | - | 500 kHz | |
| Power Supply Range | - | ±2.5 V | - | ±18 V | |
| Output Swing | VS = ±12 V | - | - | ±10 V | |
| Power Supply Current | - | - | - | 1 mA | |
| Operating Temperature | - | -40°C | - | +85°C |
Key Features
- High input common-mode voltage range up to ±270 V
- Input protection from common-mode or differential mode transients up to ±500 V
- Low offset voltage and drift (20 µV/°C for AD629A, 10 µV/°C for AD629B)
- Low gain nonlinearity (3 ppm maximum for AD629B)
- Excellent CMRR over a wide frequency range (77 dB minimum at 500 Hz for AD629A, 86 dB minimum at 500 Hz for AD629B)
- Wide power supply range (±2.5 V to ±18 V)
- High bandwidth of 500 kHz
- Low power supply current (1 mA maximum)
- Available in 8-lead PDIP and 8-lead SOIC packages
Applications
- High voltage current sensing
- Battery cell voltage monitoring
- Power supply current monitoring
- Motor control
- Isolation in applications not requiring galvanic isolation
Q & A
- What is the maximum common-mode voltage range of the AD629BR?
The AD629BR can handle a common-mode voltage range up to ±270 V.
- What is the input protection level for the AD629BR?
The inputs are protected from common-mode or differential mode transients up to ±500 V.
- What is the typical gain nonlinearity of the AD629BR?
The gain nonlinearity is 3 ppm maximum for the AD629B model.
- What is the CMRR of the AD629BR at 500 Hz?
The CMRR is 77 dB minimum for AD629A and 86 dB minimum for AD629B at 500 Hz.
- What is the bandwidth of the AD629BR?
The bandwidth is 500 kHz.
- What is the power supply range for the AD629BR?
The power supply range is ±2.5 V to ±18 V.
- What is the maximum output swing of the AD629BR on a ±12 V supply?
The maximum output swing is ±10 V on a ±12 V supply.[
- What is the maximum power supply current of the AD629BR?
The maximum power supply current is 1 mA.[
- What are the typical operating temperatures for the AD629BR?
The operating temperature range is from -40°C to +85°C.[
- In what packages is the AD629BR available?
The AD629BR is available in 8-lead PDIP and 8-lead SOIC packages.[
- What are some common applications of the AD629BR?
Common applications include high voltage current sensing, battery cell voltage monitoring, power supply current monitoring, motor control, and isolation in applications not requiring galvanic isolation.[
