Overview
The AD4021BCPZ-RL7 is a high-accuracy, high-speed, low-power 20-bit precision successive approximation register (SAR) analog-to-digital converter (ADC) produced by Analog Devices Inc. This ADC operates from a single power supply, VDD, and features an externally applied reference voltage, VREF, which can be set independently of the supply voltage. The AD4021 is part of the AD4020/AD4021/AD4022 family, known for their Easy Drive technology, which reduces signal chain complexity and power consumption, enabling higher channel density.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 20 | - | - | Bits |
| Analog Input Voltage Range | -VREF | - | +VREF | V |
| Operating Input Voltage (VIN+, VIN- to GND) | -0.1 | - | +VREF + 0.1 | V |
| Common-Mode Input Range | VREF/2 - 0.125 | - | VREF/2 + 0.125 | V |
| Common-Mode Rejection Ratio (CMRR) | - | 68 | - | dB |
| Throughput | - | - | 1 MSPS | - |
| Conversion Time | - | - | 1000 ns | - |
| Acquisition Phase | - | - | 770 ns | - |
| Power Consumption | - | - | 1.0 mW | - |
| Energy per Conversion | - | - | 8.3 nJ/sample | - |
| Temperature Range | -40 | - | +125 | °C |
Key Features
- Easy Drive Technology: Reduces signal chain complexity and power consumption, enabling higher channel density and eliminating the need for a dedicated ADC driver.
- Input Span Compression: Allows access to the full ADC code range 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.
- High-Z Mode: Reduces input current, particularly in high-Z mode, coupled with a long signal acquisition phase.
- 3-Wire or 4-Wire SPI Interface: Supports daisy chain and CS modes for flexible communication.
Applications
The AD4021BCPZ-RL7 is suitable for a variety of high-performance applications, including:
- Industrial Automation: For precise measurement and control in industrial environments.
- Medical Devices: For high-accuracy data acquisition in medical equipment.
- Aerospace and Defense: For reliable and precise data conversion in harsh environments.
- Test and Measurement Equipment: For high-speed and accurate data acquisition in various test and measurement applications.
Q & A
- What is the resolution of the AD4021BCPZ-RL7 ADC?
The AD4021BCPZ-RL7 has a resolution of 20 bits. - What is the typical throughput of the AD4021BCPZ-RL7?
The typical throughput is 1 MSPS. - What is the operating temperature range of the AD4021BCPZ-RL7?
The specified performance temperature range is from -40°C to +125°C. - Does the AD4021BCPZ-RL7 support input span compression?
Yes, it supports input span compression, allowing access to the full ADC code range without a negative supply. - What is the power consumption of the AD4021BCPZ-RL7?
The power consumption is typically 1.0 mW. - What interface does the AD4021BCPZ-RL7 use for communication?
The AD4021BCPZ-RL7 uses a 3-wire or 4-wire SPI interface. - What is the purpose of the high-Z mode in the AD4021BCPZ-RL7?
The high-Z mode reduces input current, particularly useful during signal acquisition phases. - Is the AD4021BCPZ-RL7 protected against overvoltage events?
Yes, it features an input overvoltage clamp to protect the ADC inputs. - What package type is the AD4021BCPZ-RL7 available in?
The AD4021BCPZ-RL7 is available in a 10-Lead LFCSP (3mm x 3mm) package. - Can the AD4021BCPZ-RL7 be used in industrial automation applications?
Yes, it is suitable for precise measurement and control in industrial environments.
