Overview
The AD629AN, produced by Analog Devices Inc., is a high-performance difference amplifier designed to accurately measure differential signals in the presence of high common-mode voltages. This precision device operates over a wide common-mode voltage range of up to ±270 V and is protected against common-mode or differential mode transients up to ±500 V. The AD629AN is particularly useful in applications where galvanic isolation is not required, making it a cost-effective alternative to isolation amplifiers.
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 | 0.03 | % |
| Gain Nonlinearity | RL = 10 kΩ | 3 | 10 | 10 | ppm |
| Gain vs. Temperature | TA = TMIN to TMAX | 3 | 10 | 10 | ppm/°C |
| Offset Voltage | VS = ±5 V | 0.1 | 1 | 0.5 | mV |
| Offset Drift | TA = TMIN to TMAX | 3 | 10 | 10 | 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 | ±12 V Supply | - | - | ±10 V | |
| Power Supply Current | - | - | - | 1 mA |
Key Features
- High common-mode voltage range up to ±270 V
- Input protection against common-mode or differential mode transients up to ±500 V
- Low offset, low offset drift, and low gain error drift
- Excellent common-mode rejection ratio (CMRR) over a wide frequency range
- Wide power supply range from ±2.5 V to ±18 V
- ±10 V output swing on ±12 V supply
- Low power supply current of 1 mA maximum
- Available in 8-lead PDIP and 8-lead SOIC packages
- Operates over an industrial temperature range of −40°C to +85°C
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 common-mode voltage range of the AD629AN?
The AD629AN operates over a common-mode voltage range of up to ±270 V.
- What is the maximum differential input voltage for the AD629AN?
The maximum differential input voltage is ±13 V.
- What is the output swing of the AD629AN on a ±12 V supply?
The output swing is ±10 V on a ±12 V supply.
- What is the maximum power supply current of the AD629AN?
The maximum power supply current is 1 mA.
- What are the typical applications of the AD629AN?
Typical applications include high voltage current sensing, battery cell voltage monitoring, power supply current monitoring, and motor control.
- What is the temperature range over which the AD629AN operates?
The AD629AN operates over an industrial temperature range of −40°C to +85°C.
- What are the package options available for the AD629AN?
The AD629AN is available in 8-lead PDIP and 8-lead SOIC packages.
- How does the AD629AN protect against ESD?
The AD629AN features proprietary ESD protection circuitry, but proper ESD precautions are still recommended to avoid performance degradation or loss of functionality.
- What is the bandwidth of the AD629AN?
The bandwidth of the AD629AN is 500 kHz.
- Can the AD629AN replace isolation amplifiers in some applications?
