AD4020
RECOMMENDED FOR NEW DESIGNS20-Bit, 1.8 MSPS/1 MSPS/500 kSPS, Easy Drive, Differential SAR ADCs
- Part Models
- 3
- 1ku List Price
- Starting From $29.49
Part Details
- Easy Drive
- Greatly reduced input kickback
- Input current reduced to 0.5 μA/MSPS
- Enhanced acquisition phase, ≥77% of cycle time at 1 MSPS
- First conversion accurate, no latency or pipeline delay
- Input span compression for single-supply operation
- Fast conversion allows low SPI clock rates
- Input overvoltage clamp protection sinks up to 50 mA
- SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface
- Greatly reduced input kickback
- High performance
- Differential analog input range: ±VREF, VREF from 2.4 V to 5.1 V
- Throughput: 1.8 MSPS/1 MSPS/500 kSPS options
- INL: ±3.1 ppm maximum
- Guaranteed 20-bit, no missing codes
- SNR: 100.5 dB at fIN = 1 kHz, VREF = 5 V
- THD: −123 dB at fIN = 1 kHz, −100 dB at fIN = 100 kHz
- SINAD: 89 dB at fIN = 900 kHz (see Figure 17 in the data sheet)
- Oversampled dynamic range
- 104 dB for OSR = 2
- 131 dB for OSR = 1024
- Low power
- Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface
- 2.7 mW at 500 kSPS (VDD only)
- 83 μW at 10 kSPS, 15 mW at 1.8 MSPS (total power)
- 10-lead packages: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOP
- Guaranteed operation: −40°C to +125°C
The AD4020 is a high accuracy, high speed, low power, 20-bit, Easy Drive, precision successive approximation register (SAR) analog-to-digital converter (ADC) that operates from a single power supply, VDD. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage. The AD4020 power scales linearly with throughput.
Easy Drive features reduce both signal chain complexity and power consumption while enabling higher channel density. The reduced input current, particularly in high-Z mode, coupled with a long signal acquisition phase, eliminates the need for a dedicated ADC driver. Easy Drive broadens the range of companion circuitry that is capable of driving these ADCs (see Figure 2 in the data sheet).
Input span compression eliminates the need to provide a negative supply to the ADC driver amplifier while preserving access to the full ADC code range. 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.
Fast device throughput up to 1.8 MSPS allows users to accurately capture high frequency signals and to implement oversampling techniques to alleviate the challenges associated with antialias filter designs. Decreased serial peripheral interface (SPI) clock rate requirements reduce digital input/output power consumption, broadens digital host options, and simplifies the task of sending data across digital isolation. The SPI-compatible serial user interface is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic by using the separate VIO logic supply.
APPLICATIONS
- Automatic test equipment
- Machine automation
- Medical equipment
- Battery-powered equipment
- Precision data acquisition systems
- Instrumentation and control systems
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Video 3
Device Drivers 3
3rd Party Solutions 2
Analog Dialogue 3
Webcast 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD4020BCPZ-RL7 | 10-Lead LFCSP (3mm x 3mm) | ||
| AD4020BRMZ | 10-Lead MSOP | ||
| AD4020BRMZ-RL7 | 10-Lead MSOP |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 3
FPGA/HDL 1
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
-
Precision, Low Power, Low Distortion Applications -
Typical Application with Multiple Supplies -
Typical Application with a Fully Differential Amplifier
| Parts | Product Life Cycle | Description |
|---|---|---|
| General Purpose Op Amps 1 | ||
| ADA4692-2 | PRODUCTION | Low Power, 3.6 MHz, Low Noise, Rail-to-Rail Output, Operational Amplifiers |
| High Speed Op Amps (Bandwidth ≥ 50MHz) 1 | ||
| ADA4807-1 | RECOMMENDED FOR NEW DESIGNS |
3.1 nV/√Hz, 1 mA, 180 MHz, Rail-to-Rail Input/Output Amplifier |
| High Voltage Op Amps ≥12V 2 | ||
| ADA4610-1 | RECOMMENDED FOR NEW DESIGNS |
Low Noise, Precision, Rail-to-Rail Output, JFET Single Op Amp |
| ADA4077-1 | RECOMMENDED FOR NEW DESIGNS | 4 MHz, 7 nV/√Hz, Low Offset and Drift, High Precision Single Amplifier |
| Internal Power Switch Buck Regulators 1 | ||
| ADP5300 | PRODUCTION |
50 mA/500 mA, High Efficiency, Ultralow Power Step-Down Regulator |
| Low Noise Op Amps (≤ 10nV/√Hz) 1 | ||
| ADA4897-1 | RECOMMENDED FOR NEW DESIGNS | 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers |
| Low Power Op Amps (≤ 1mA/amp) 2 | ||
| AD8031 | PRODUCTION | 2.7 V, 800 µA, 80 MHz Rail-to-Rail I/O Single Amplifier |
| ADA4084-1 | RECOMMENDED FOR NEW DESIGNS |
30 V, Low Noise, Rail-to-Rail Input/Output, Low Power Operational Single Amplifier |
| Positive Linear Regulators (LDO) 2 | ||
| ADP7118 | RECOMMENDED FOR NEW DESIGNS | 20 V, 200 mA, Low Noise, CMOS LDO Linear Regulator |
| ADP124 | RECOMMENDED FOR NEW DESIGNS |
5.5V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulator with 31 Fixed-output Voltages |
| Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C) 1 | ||
| ADA4096-2 | RECOMMENDED FOR NEW DESIGNS | 30 V, Micropower, Overvoltage Protection, Rail-to-Rail Input/Output Dual Op Amplifier |
| Series Voltage References 11 | ||
| ADR4550 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 5.0V Voltage Reference |
| ADR4540 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 4.096V Voltage Reference |
| ADR4533 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 3.3V Voltage Reference |
| ADR4525 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 2.5V Voltage Reference |
| ADR444 | PRODUCTION | Ultralow Noise, LDO XFET® 4.096V Voltage Reference w/Current Sink and Source |
| ADR445 | PRODUCTION | Ultralow Noise, LDO XFET® 5.0V Voltage Reference w/Current Sink and Source |
| ADR441 | PRODUCTION | Ultralow Noise, LDO XFET® 2.5V Voltage Reference w/Current Sink and Source |
| ADR3450 | PRODUCTION | Micro-Power, High-Accuracy 5.0V Voltage Reference |
| ADR3440 | PRODUCTION | Micro-Power, High-Accuracy 4.096V Voltage Reference |
| ADR3533 | RECOMMENDED FOR NEW DESIGNS | Micropower, Precision, Auto Qualified 3.3V Voltage Reference |
| ADR3525 | RECOMMENDED FOR NEW DESIGNS | Micropower, Precision, Auto Qualified 2.5V Voltage Reference |
| Single-Ended to Differential Amplifiers 2 | ||
| ADA4940-1 | PRODUCTION | Ultralow Power, Low Distortion ADC Driver |
| ADA4932-1 | RECOMMENDED FOR NEW DESIGNS | Low Power Differential ADC Driver |
| Standard Digital Isolators 2 | ||
| ADUM141D | RECOMMENDED FOR NEW DESIGNS |
Robust, Quad Channel Isolator W/ Input Disable & 1 Reverse Channel |
| ADUM141E | RECOMMENDED FOR NEW DESIGNS |
Robust, Quad Channel Isolator W/ Output Enable & 1 Reverse Channel |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- AD4020
Precision ADC Driver Tool
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
Open ToolSignal Chain Designer - BETA
Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.
Open ToolAD4000 Series IBIS Models 2
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
Evaluation Board for the AD4000 Series 16-/18-/20-Bit Precision SAR ADCs
Resources
Software
Reference Designs
20-Bit, 1.8 MSPS, ±2.5 ppm INL, Low Drift, High Accuracy Data Acquisition Solution