AD4020

RECOMMENDED FOR NEW DESIGNS

20-Bit, 1.8 MSPS/1 MSPS/500 kSPS, Easy Drive, Differential SAR ADCs

Data Sheet (Rev. C) Product Selection Table

Part Models: 4
1ku List Price: Starting From $29.49

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Overview

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
High performance
- Differential analog input range: ±V_REF, V_REF 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 f_IN = 1 kHz, V_REF = 5 V
THD: −123 dB at f_IN = 1 kHz, −100 dB at f_IN = 100 kHz
SINAD: 89 dB at f_IN = 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
- Pin compatible with AD4003/AD4007/AD4011 family
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, V_REF, 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

Part Models: 4
1ku List Price: Starting From $29.49

Documentation

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-R2	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD4020BCPZ-RL7	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD4020BRMZ	MICRO SOIC	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD4020BRMZ-RL7	MICRO SOIC	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Device Drivers 3

Can't find the software or driver you need?

Hardware Ecosystem

Precision, Low Power, Low Distortion Applications

Modify Design LTspice Simulation
Typical Application with Multiple Supplies

Modify Design LTspice Simulation
Typical Application with a Fully Differential Amplifier

Modify Design LTspice Simulation

Parts	Product Life Cycle	Description
Differential Amplifiers 2
ADA4940-1	PRODUCTION	Ultralow Power, Low Distortion ADC Driver
ADA4932-1	RECOMMENDED FOR NEW DESIGNS	Low Power Differential ADC Driver
Interface Transceivers & 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

LDO Linear Regulators 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
Operational Amplifiers (Op Amps) 8
ADA4807-1	RECOMMENDED FOR NEW DESIGNS	3.1 nV/√Hz, 1 mA, 180 MHz, Rail-to-Rail Input/Output Amplifier
ADA4897-1	RECOMMENDED FOR NEW DESIGNS	1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers
ADA4096-2	RECOMMENDED FOR NEW DESIGNS	30 V, Micropower, Overvoltage Protection, Rail-to-Rail Input/Output Dual Op Amplifier
ADA4692-2	PRODUCTION	Low Power, 3.6 MHz, Low Noise, Rail-to-Rail Output, Operational Amplifiers
ADA4077-1	RECOMMENDED FOR NEW DESIGNS	4 MHz, 7 nV/√Hz, Low Offset and Drift, High Precision Single Amplifier
ADA4084-1	RECOMMENDED FOR NEW DESIGNS	30 V, Low Noise, Rail-to-Rail Input/Output, Low Power Operational Single Amplifier
ADA4610-1	RECOMMENDED FOR NEW DESIGNS	Low Noise, Precision, Rail-to-Rail Output, JFET Single Op Amp
AD8031	PRODUCTION	2.7 V, 800 µA, 80 MHz Rail-to-Rail I/O Single Amplifier
Switching Regulators & Controllers 1
ADP5300	PRODUCTION	50 mA/500 mA, High Efficiency, Ultralow Power Step-Down Regulator
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

Tools & Simulations

LTspice

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 Tool

AD4000 Series IBIS Models 2

ad4003_lfcsp.ibs
ad4003_msop.ibs

Signal Chain Designer

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 Tool

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

Buy Now View Details

Features and Benefits

Fully featured evaluation board for 10-lead precision ADCs
Versatile analog signal conditioning circuitry
On-board reference, reference buffers, and ADC drivers
PC software for control and data analysis of time and frequency domain
System demonstration platform-compatible (SDP-H1)

Product Details

The AD4000/AD4001/AD4002/AD4003/AD4020 family of evaluation boards enable quick, simplified evaluation of the AD4000 family of 16-/18-/20-bit, precision successive approx-imation register (SAR) analog-to-digital converters (ADCs). The AD4000/AD4001/AD4002/AD4003/AD4020 are low power, 16-bit/18-bit/20-bit, precision SAR ADCs that offer high performance with throughputs up to 2 MSPS (1.8 MSPS for the AD4020). The evaluation board demonstrates the performance of the AD4000/AD4001/AD4002/AD4003/AD4020 family of ADCs and provides a simplified interface for a variety of system applications.

The EVAL-AD4000FMCZ/EVAL-AD4001FMCZ/EVAL-AD4002FMCZ/EVAL-AD4003FMCZ/EVAL-AD4020FMCZ evaluation boards, accessible from the EVAL-AD400x-FMCZ product page, are ideal for use with the Analog Devices, Inc., high speed system demonstration platform (SDP-H1). These evaluation boards interface to the SDP-H1 board via a field-programmable gate array (FPGA) mezzanine card (FMC) low pin count (LPC) connector.

On-board components include a high precision buffered band gap 5.0 V reference (ADR4550), a reference buffer (ADA4807-1), a common-mode buffer (ADA4807-1), a signal conditioning circuit with two op amps (ADA4807-1), and a power supply to derive the necessary voltage levels to supply all voltage needs.

The EVAL-AD4000FMCZ, EVAL-AD4001FMCZ, EVAL-AD4002FMCZ, EVAL-AD4003FMCZ, and EVAL-AD4020FMCZ are populated with the AD4000, AD4001, AD4002, AD4003, and AD4020, respectively. However, these boards can be used to evaluate the performance of the AD4004, AD4005, AD4006, AD4007, AD4008, AD4010, AD4011, AD4021, and AD4022 by limiting the sample rate in the evaluation software to the maximum sample rate of the specific ADC. For example, the AD4000 on the EVAL-AD4000FMCZ can be used to evaluate the performance of the AD4004 if the sample rate is limited to 1 MSPS. See the data sheet of each product for the corresponding evaluation board.

Full descriptions of these products are available in their respective data sheets, which must be consulted when using the corresponding evaluation board. Table 7 shows the models of the AD4000/AD4001/AD4002/AD4003/AD4020 evaluation boards.

Resources

UG-1042: Evaluation Board for the AD4000 Series 16-/18-/20-Bit Precision SAR ADCs (Rev.I)
10/28/2016

AD400x GitHub no-OS Driver Source Code
4/2/2021

AD400x GitHub Linux Driver Source Code
4/2/2021

Software

AD4000 Series Evaluation Software Installer
290.59 M

Reference Designs

20-Bit, 1.8 MSPS, ±2.5 ppm INL, Low Drift, High Accuracy Data Acquisition Solution

View Detailed Reference Design

Features and Benefits

Data acquisition solution fully characterized over 0°C to 70°C
Guaranteed 20-bit no missing codes
INL: ±2 ppm, DNL: ±0.25 ppm
Throughput: 1.8 MSPS
Offset error drift: ±3.5 ppm/°C; gain error drift: ±6 ppm/°C
SNR: 98 dB at G = 1, 92 dB at G = 10, f_IN = 1 kHz
THD: −120 dB at G = 1, −116 dB at G = 10, f_IN = 1 kHz
Oversampled dynamic range: 102 dB at 900 kSPS, OSR = 2
Software programmable bipolar input ranges (±1 V to ±10 V)
- Allows single-ended and differential signals
CMRR: 92 dB typical
GΩ input impedance allows direct interface with sensors
Ease of use features reduce system power and complexity
ADC Input overvoltage clamp protection sinks up to 50 mA
On-board 5 V reference and buffer
First conversion accurate, no latency/pipeline delay
Fast conversion time allows low SPI clock rates
SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface