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AD4008
16-Bit, 2 MSPS/1 MSPS/500 kSPS, Precision, Pseudo Differential, SAR ADCs
Overview
Features and Benefits
- Easy Drive
- Greatly reduced input kickback
- Input current reduced to 0.4 μA/MSPS
- Enhanced acquisition phase, ≥79% of cycle time at 1 MSPS
- First conversion accurate, no latency or pipeline delay
- Input span compression for single-supply operation
- Fast conversion time 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
- Pseudo differential input range
- 0 V to VREF with VREF from 2.4 V to 5.1 V
- Throughput: 2 MSPS/1 MSPS/500 kSPS options
- INL: ±1.0 LSB maximum
- Guaranteed 16-bit, no missing codes
- Pseudo differential input range
- SNR: 93 dB at fIN = 1 kHz, VREF = 5 V
- THD: −115 dB at fIN = 1 kHz; −95 dB at fIN = 100 kHz
- SINAD: 82 dB at fIN = 1 MHz (see Figure 17 in data sheet)
- Oversampled dynamic range
- 96 dB for OSR = 2
- 123 dB for OSR = 1024
- Low power
- Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface
- 2.5 mW at 500 kSPS (VDD only)
- 70 μW at 10 kSPS, 14 mW typical at 2 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
Product Details
The AD4000/AD4004/AD4008 are high accuracy, high speed, low power, 16-bit, Easy Drive, precision successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a single power supply, VDD. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage. The AD4000/AD40004/AD4008 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 2 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 and 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
- Automated test equipment
- Machine automation
- Medical equipment
- Battery-powered equipment
- Precision data acquisition systems
- Instrumentation and control systems
Product Categories
Markets and Technologies
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
FPGA/HDL
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
AD4008 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.
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.