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AD4002
18-Bit, 2 MSPS Precision Pseudo Differential SAR ADC
Overview
Features and Benefits
- Throughput: 2 MSPS maximum
- INL: ±3.2 LSB maximum
- Guaranteed 18-bit no missing codes
- Low power
- 9.75 mW at 2 MSPS (VDD only)
- 70 μW at 10 kSPS, 14 mW at 2 MSPS (total)
- SNR: 95 dB typical at 1 kHz, 95 dB typical at 100 kHz
- THD: -125 dB typical at 1 kHz, −108 dB typical at 100 kHz
- 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
- Pseudo differential (single-ended) analog input range: 0 V to VREF with VREF between 2.4 V to 5.1 V
- Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface
- SAR architecture: no latency/pipeline delay
- Guaranteed operation: -40°C to 125°C
- Serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible
- Ability to daisy-chain multiple ADCs and busy indicator
- 10-lead package: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOP
Product Details
The AD4002 is a low noise, low power, high speed, 18-bit, 2 MSPS precision successive approximation register (SAR) analog-to-digital converter (ADC). It incorporates ease of use features that lower the signal chain power, reduce signal chain complexity, and enable higher channel density. The high-Z mode, coupled with a long acquisition phase, eliminates the need for a dedicated high power, high speed ADC driver, thus broadening the range of low power precision amplifiers that can drive this ADC directly while still achieving optimum performance. The input span compression feature enables the ADC driver amplifier and the ADC to operate off common supply rails without the need for a negative supply while preserving the full ADC code range. The low serial peripheral interface (SPI) clock rate requirement reduces the digital input/output power consumption, broadens processor options, and simplifies the task of sending data across digital isolation.
Operating from a 1.8 V supply, the AD4002 samples an analog input (IN+) between 0 V to VREF with respect to a ground sense (IN−) with VREF ranging from 2.4 V to 5.1 V. The AD4002 consumes only 14 mW at 2 MSPS with a minimum of 75 MHz SCK rate in turbo mode and achieves ±3.2 LSB INL maximum, no missing codes at 18 bits with 95 dB SNR. The reference voltage is applied externally and can be set independently of the supply voltage.
The SPI-compatible versatile serial interface features seven different modes including the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. The AD4002 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.
The AD4002 is available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +125°C. The device is pin compatible with the 18-bit, 2 MSPS AD4003.
Applications
- Automatic test equipment
- Machine automation
- Medical equipment
- Battery-powered equipment
- Precision data acquisition systems
Product Categories
Markets & Technology
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Software & Systems Requirements
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
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
Product Recommendations
AD4002 Companion Parts
Recommended Driver Amplifiers
- For low input bias current, low noise applications: ADA4610-1.
- For high frequency, low noise, low distortion applications: ADA4897-1, ADA4932-1.
- For precision, lowest power applications: ADA4096-2, ADA4692-2, ADA4077-1, ADA4084-1.
- For precision, low power, low distortion applications: ADA4807-1.
Recommended External Voltage References
Recommended Digital Isolators
Recommended Low Dropout Regulators and Switchers
Recommended MEMS Accelerometers
- For low noise, low drift, low power 3-axis accelerometer: ADXL354.
Reference Materials
AD400x Solves Design Challenges and Reduces System Complexity
Technical Articles (1)
Design Resources
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.
Support & Discussions
AD4002 Discussions
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
