Overview
The AD629ANZ, 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 AD629ANZ 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, making it suitable for high-accuracy DC performance and excellent AC specifications.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Nominal Gain | VOUT = ±10 V, RL = 2 kΩ | 1 | 1 | 1 | V/V |
| Gain Error | VOUT = ±10 V, RL = 2 kΩ | 0.01 | 0.05 | 0.05 | % |
| Gain Nonlinearity | RL = 2 kΩ | 4 | 10 | 10 | ppm |
| Gain vs. Temperature | TA = TMIN to TMAX | 3 | 10 | 10 | ppm/°C |
| Offset Voltage | VS = ±5 V | 0.2 | 1 | 1 | mV |
| Offset Drift | TA = TMIN to TMAX | 6 | 20 | 20 | μV/°C |
| Common-Mode Rejection Ratio (CMRR) | VS = ±12 V, 500 Hz | 77 | - | - | dB (AD629A) |
| Bandwidth | - | - | - | 500 kHz | - |
| Power Supply Range | - | ±2.5 V | - | ±18 V | - |
| Maximum Power Supply Current | - | - | - | 1 mA | - |
| Output Swing | VS = ±12 V | - | - | ±10 V | - |
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 and offset drift (20 μV/°C for AD629A, 10 μV/°C for AD629B)
- Low gain error drift (10 ppm/°C)
- Excellent common-mode rejection ratio (CMRR) over a wide frequency range (77 dB minimum at 500 Hz for AD629A, 86 dB minimum at 500 Hz for AD629B)
- 500 kHz bandwidth
- Wide power supply range (±2.5 V to ±18 V)
- ±10 V output swing on ±12 V supply
- Maximum power supply current of 1 mA
Applications
- High voltage current sensing
- Battery cell voltage monitoring
- Power supply current monitoring
- Motor control
- Isolation in applications where galvanic isolation is not required
Q & A
- What is the common-mode voltage range of the AD629ANZ?
The AD629ANZ has a common-mode voltage range of up to ±270 V.
- What is the maximum differential voltage the AD629ANZ can handle?
The AD629ANZ can handle a maximum differential voltage of ±13 V.
- What is the bandwidth of the AD629ANZ?
The bandwidth of the AD629ANZ is 500 kHz.
- What is the power supply range for the AD629ANZ?
The AD629ANZ operates over a power supply range of ±2.5 V to ±18 V.
- What is the maximum output swing on a ±12 V supply?
The maximum output swing on a ±12 V supply is ±10 V.
- What is the maximum power supply current for the AD629ANZ?
The maximum power supply current for the AD629ANZ is 1 mA.
- What are some typical applications of the AD629ANZ?
Typical applications include high voltage current sensing, battery cell voltage monitoring, power supply current monitoring, motor control, and isolation in applications where galvanic isolation is not required.
- How does the AD629ANZ protect against input transients?
The AD629ANZ has input protection from common-mode or differential mode transients up to ±500 V.
- What are the package options available for the AD629ANZ?
The AD629ANZ is available in 8-lead PDIP and 8-lead SOIC packages.
- What is the operating temperature range for the AD629ANZ?
The AD629ANZ operates over an industrial temperature range of −40°C to +85°C.
