Overview
The AD8207WBRZ from Analog Devices Inc. is a single-supply, zero-drift, high-voltage difference amplifier. It is designed to amplify small differential voltages in the presence of large common-mode voltages, making it ideal for applications such as current shunt monitoring, solenoid control, and motor control. The device operates with a single-supply voltage ranging from 3.3V to 5.5V and can withstand large input PWM common-mode voltages. It features excellent DC performance over temperature, ensuring minimal errors in measurement loops.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| GAIN | - | 20 | - | V/V | - |
| VOLTAGE OFFSET | - | ±100 μV | ±400 μV | - | At 25°C and over temperature |
| OFFSET DRIFT | -1 | - | 1 μV/°C | - | Over temperature |
| INPUT IMPEDANCE | - | 240 kΩ | - | - | Differential |
| - | - | 126 kΩ | - | Common Mode | |
| INPUT VOLTAGE RANGE | -4 V | - | +65 V | - | Common mode, continuous, V+ = 5 V |
| - | -4 V | - | +35 V | - | Common mode, continuous, V+ = 3.3 V |
| COMMON-MODE REJECTION (CMRR) | 80 dB | 90 dB | - | - | DC to 20 kHz |
| OUTPUT VOLTAGE RANGE | 0.02 V+ - 0.05 V | - | - | - | - |
| TEMPERATURE RANGE | -40°C | - | +125°C | - | For specified performance |
| SLEW RATE | - | 1 V/μs | - | - | Typical |
Key Features
- Ideal for current shunt applications and includes EMI filters.
- Bidirectional current monitoring capability.
- High common-mode voltage range: -4 V to +65 V (with 5 V supply) and -4 V to +35 V (with 3.3 V supply).
- Low offset voltage and drift: typically less than 500 nV/°C offset drift and below 10 ppm/°C gain drift.
- High common-mode rejection ratio (CMRR): 90 dB typical from DC to 20 kHz.
- Qualified for automotive applications with a wide operating temperature range of -40°C to +125°C.
- Available in an 8-lead SOIC package.
- Reference pins (VREF1 and VREF2) for easy output offset adjustment.
Applications
- High-side current sensing in motor control and solenoid control.
- Engine management and electric power steering.
- Suspension control and vehicle dynamic control.
- DC-to-DC converters.
Q & A
- What is the typical offset drift of the AD8207WBRZ?
The AD8207WBRZ has a typical offset drift of less than 500 nV/°C. - What is the common-mode rejection ratio (CMRR) of the AD8207WBRZ?
The CMRR of the AD8207WBRZ is typically 90 dB from DC to 20 kHz. - What is the operating temperature range of the AD8207WBRZ?
The operating temperature range is from -40°C to +125°C. - What is the supply voltage range for the AD8207WBRZ?
The supply voltage range is from 3.3V to 5.5V. - Is the AD8207WBRZ qualified for automotive applications?
Yes, the AD8207WBRZ is qualified for automotive applications. - What package type is the AD8207WBRZ available in?
The AD8207WBRZ is available in an 8-lead SOIC package. - How does the AD8207WBRZ handle large input PWM common-mode voltages?
The AD8207WBRZ is designed to withstand large input PWM common-mode voltages, making it suitable for solenoid and motor control applications. - What is the gain of the AD8207WBRZ?
The gain of the AD8207WBRZ is 20 V/V. - How can the output offset of the AD8207WBRZ be adjusted?
The output offset can be adjusted using the reference pins (VREF1 and VREF2) by applying an external low impedance voltage. - What are some typical applications of the AD8207WBRZ?
Typical applications include high-side current sensing, engine management, electric power steering, and DC-to-DC converters.
