Analog Devices Inc. AD4020 20-Bit Precision SAR ADC
Analog Devices Inc. AD4020 20-Bit Precision SAR ADC is a low-power, low-noise, 1.8MSPS 20-Bit Precision Successive Approximation Register (SAR) Analog-to-Digital Converter. The AD4020 ADC offers ease-of-use features that lower the signal chain power, reduce signal chain complexity, and enable higher channel density. Operating using a 1.8V supply, the AD4020 ADC provides a ±VREF fully differential input range with a 2.4V to 5.1V. VREF range. In turbo mode, the AD4020 ADC consumes only 15mW at 1.8MSPS with a minimum SCK rate of 71MHz. The ADC achieves ±3.1ppm integral nonlinearity (INL). The AD4020 guarantees no missing codes at 20 bits with 100.5dB typical signal-to-noise ratio (SNR).
The Analog Devices AD4020 ADC's SPI-compatible versatile serial interface provides seven different modes. Using the SDI input, designers can daisy-chain several ADCs on a single 3-wire bus. The AD4020 ADC is specified for operation from -40°C to +125°C and is compatible with 1.8V, 2.5V, 3V, and 5V logic.
Features
- Guaranteed 20-bit no missing codes
- Low Power
- 9.0mW at 1.8MSPS (VDD only)
- 83μW at 10kSPS, 15mW at 1.8MSPS (total)
- Ease-of-Use Features Reduce System Power and Complexity
- Input overvoltage clamp circuit
- Reduced nonlinear input charge kickback
- High-Z mode
- Long acquisition phase
- Input span compression
- Fast conversion time allows low SPI clock rates
- SPI-programmable modes, read/write capability, status word
- 1.8MSPS maximum throughput
- ±3.1ppm maximum INL
- SNR: 100.5dB typical at 1kHz, 99dB typical at 100kHz
- THD: −123dB typical at 1kHz, −100dB typical at 100kHz
- Differential Analog Input Range
- 0V to VREF with VREF from 2.4V to 5.1V
- Single 1.8V supply operation with 1.71V to 5.5V logic interface
- SAR architecture: no latency/pipeline delay
- Valid first accurate conversion
- −40°C to +125°C operating temperature range
- SPI/QSPI/MICROWIRE/DSP compatible serial interface
- Ability to daisy-chain multiple ADCs and busy indicator
- 10-lead packages: 3mm x 3mm LFCSP, 3mm x 4.90mm MSOP
Applications
- Automatic test equipment
- Machine automation
- Medical equipment
- Battery-powered equipment
- Precision data acquisition systems
Block Diagram
Videos
Evaluation Boards
Analog Devices Inc. EVAL-AD4020FMCZ Eval for AD4020 20-Bit SAR ADC
Demonstrates the performance of the AD4020 20-Bit SAR ADCs.
Analog Devices Inc. EVAL-SDP-CB1Z System Demonstration Platform
Provides a means of communicating w/PC from the system under evaluation.
Analog Devices Inc. EV-AD4020REFDGNZ Reference Design Board
Integrates a unique ADI programmable gain instrumentation amplifier (PGIA).
Related Products
Analog Devices Inc. AD4021/AD4022 Differential SAR ADCs
High-speed, low-power, 20-bit, Easy Drive, precision SAR ADCs operating from a single power supply.
Analog Devices Inc. AD40xx 16/18-Bit SAR ADCs
Low-noise 16-/18-bit precision SAR ADCs that offer high-performance with throughputs up to 2MSPS.
Analog Devices Inc. ADA4254 High-Voltage Low-Power PGIA
Zero-drift, high-voltage, low-power programmable gain instrumentation amplifier.
Additional Resources
Driving High Precision ADCs
Ensure the full performance capabilities of connected sensors can be exploited by using this reference design which has been optimized for fast, high precision data acquisition systems.