Overview
The AD4020BRMZ is a high-accuracy, high-speed, low-power 20-bit successive approximation register (SAR) analog-to-digital converter (ADC) produced by Analog Devices Inc. This ADC operates from a single power supply and features an externally applied reference voltage, which can be set independently of the supply voltage. The AD4020 is part of the AD4000 family of precision SAR ADCs, known for their high performance and low power consumption. It is particularly suited for applications requiring high channel density and reduced signal chain complexity.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 20 | - | - | Bits |
| Sampling Rate | - | - | 1.8 | MSPS |
| Throughput Time | - | - | 555 | ns |
| Conversion Time | 300 | 320 | 350 | ns |
| Acquisition Phase | 325 | - | - | ns |
| Analog Input Voltage Range | -VREF | - | +VREF | V |
| Common-Mode Input Range | VREF/2 - 0.125 | - | VREF/2 + 0.125 | V |
| Integral Nonlinearity Error (INL) | -3.1 | - | +3.1 | ppm |
| Differential Nonlinearity Error (DNL) | -0.5 | - | +0.5 | LSB |
| Power Supply Voltage (VDD) | 1.71 | - | 1.89 | V |
| Operating Temperature Range | -40 | - | +125 | °C |
| Package Type | - | - | 10-Lead MSOP | - |
Key Features
- High Accuracy and Speed: The AD4020 offers 20-bit resolution with sampling rates up to 1.8 MSPS, making it suitable for high-performance applications.
- Low Power Consumption: The power consumption scales linearly with throughput, reducing power usage in lower throughput applications.
- Easy Drive Technology: This feature reduces signal chain complexity and power consumption by enabling higher channel density and eliminating the need for a dedicated ADC driver.
- Input Span Compression: This feature allows for full ADC code range access without the need for a negative supply to the ADC driver amplifier.
- Input Overvoltage Clamp: Protects the ADC inputs against overvoltage events, minimizing disturbances on the reference pin and eliminating the need for external protection diodes.
- Flexible Interface: Supports 3-wire or 4-wire SPI interface, including daisy chain and CS configurations.
Applications
- Industrial Automation: Suitable for high-precision measurement and control systems.
- Medical Devices: Ideal for medical imaging, patient monitoring, and other medical applications requiring high accuracy and low power consumption.
- Aerospace and Defense: Used in various military and aerospace applications where high reliability and precision are critical.
- Test and Measurement Equipment: Utilized in precision measurement instruments such as multimeters, oscilloscopes, and signal analyzers.
- Automotive Systems: Applied in advanced driver-assistance systems (ADAS) and other automotive applications requiring high accuracy and reliability.
Q & A
- What is the resolution of the AD4020 ADC?
The AD4020 has a 20-bit resolution.
- What are the sampling rates available for the AD4020?
The AD4020 supports sampling rates up to 1.8 MSPS.
- What is the power supply voltage range for the AD4020?
The power supply voltage (VDD) ranges from 1.71 V to 1.89 V.
- What is the operating temperature range of the AD4020?
The operating temperature range is from -40°C to +125°C.
- What package types are available for the AD4020?
The AD4020 is available in a 10-Lead MSOP package.
- What is the Easy Drive feature in the AD4020?
The Easy Drive feature reduces signal chain complexity and power consumption by enabling higher channel density and eliminating the need for a dedicated ADC driver.
- How does the input span compression feature work?
The input span compression feature allows for full ADC code range access without the need for a negative supply to the ADC driver amplifier.
- What is the purpose of the input overvoltage clamp in the AD4020?
The input overvoltage clamp protects the ADC inputs against overvoltage events, minimizing disturbances on the reference pin and eliminating the need for external protection diodes.
- What interfaces does the AD4020 support?
The AD4020 supports 3-wire or 4-wire SPI interface, including daisy chain and CS configurations.
- What are some common applications of the AD4020?
The AD4020 is commonly used in industrial automation, medical devices, aerospace and defense, test and measurement equipment, and automotive systems.
