Overview
The AD629BRZ from Analog Devices Inc. is a high common-mode voltage difference amplifier designed for precision applications requiring accurate measurement of differential signals in the presence of high common-mode voltages. This device is particularly useful in environments where common-mode voltages can reach up to ±270 V. The AD629BRZ offers high accuracy, low offset drift, and excellent common-mode rejection ratio (CMRR), making it an ideal choice for various industrial and instrumentation applications.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Nominal Gain | VOUT = ±10 V, RL = 2 kΩ | 1 | 1 | 1 | V/V |
| Gain Error | 0.01 | 0.05 | 0.03 | % | |
| Gain Nonlinearity | RL = 2 kΩ | 4 | 10 | 10 | ppm |
| Gain Nonlinearity | RL = 10 kΩ | 1 | 3 | 3 | ppm |
| Gain vs. Temperature | TA = TMIN to TMAX | 3 | 10 | 10 | ppm/°C |
| Offset Voltage | 0.1 | 0.5 | 1 | mV | |
| Offset Drift | 10 | 20 | μV/°C | ||
| CMRR @ 500 Hz | 77 | 86 | dB | ||
| Bandwidth | 500 | kHz | |||
| Slew Rate | 2.1 | V/μs | |||
| Power Supply Range | ±2.5 | ±18 | V | ||
| Power Supply Current | 1.2 | mA | |||
| Operating Temperature Range | -40 | +85 | °C | ||
| Package | SOIC-8, PDIP-8 |
Key Features
- High common-mode voltage range up to ±270 V
- Input protection up to ±500 V common mode and differential mode
- Low offset voltage and drift (10 μV/°C for AD629B)
- Low gain error and drift (3 ppm/°C)
- Excellent CMRR (up to 86 dB at 500 Hz for AD629B)
- Wide power supply range (±2.5 V to ±18 V)
- Low power supply current (1.2 mA maximum)
- High bandwidth (500 kHz) and slew rate (2.1 V/μs)
- Available in SOIC-8 and PDIP-8 packages
Applications
- High voltage current sensing
- Battery cell voltage monitors
- Power supply current monitors
- Motor controls
- Instrumentation amplifiers
- Pressure transducers and thermocouples
- Precision analog-to-digital converter applications
Q & A
- What is the common-mode voltage range of the AD629BRZ?
The AD629BRZ has a common-mode voltage range of up to ±270 V.
- What is the input protection level of the AD629BRZ?
The inputs are protected from common-mode or differential mode transients up to ±500 V.
- What is the typical gain nonlinearity of the AD629BRZ?
The gain nonlinearity is typically 3 ppm for RL = 10 kΩ.
- What is the CMRR at 500 Hz for the AD629BRZ?
The CMRR at 500 Hz is typically 86 dB for the AD629B grade.
- What is the bandwidth of the AD629BRZ?
The bandwidth is 500 kHz.
- What is the slew rate of the AD629BRZ?
The slew rate is 2.1 V/μs.
- What are the available package types for the AD629BRZ?
The AD629BRZ is available in SOIC-8 and PDIP-8 packages.
- What is the operating temperature range of the AD629BRZ?
The operating temperature range is -40°C to +85°C.
- What are some typical applications of the AD629BRZ?
Typical applications include high voltage current sensing, battery cell voltage monitors, power supply current monitors, and motor controls.
- How does the AD629BRZ compare to isolation amplifiers?
The AD629BRZ can replace costly isolation amplifiers in applications that do not require galvanic isolation.
