MAX1401
+3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC
Best Linearity for +3V, 18-Bit Sigma Delta
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Overview
Features and Benefits
- 18-Bit Resolution, Sigma-Delta ADC
- 16-Bit Accuracy with No Missing Codes to 480sps
- Access to the Mux Output/ADC Input
- Low Quiescent Current
- 250µA (operating mode)
- 2µA (power-down mode)
- 3 Fully Differential or 5 Pseudo-Differential Signal Input Channels
- 2 Additional Fully Differential Calibration Channels/Auxiliary Input Channels
- Programmable Gain and Offset
- Fully Differential Reference Inputs
- Converts Continuously or On Command
- Automatic Channel Scanning and Continuous Data Output Mode
- Operates with Analog and Digital Supplies from +2.7V to +3.6V
- SPI™/QSPI™-Compatible 3-Wire Serial Interface
- 28-Pin SSOP Package
Product Details
The MAX1401 18-bit, low-power, multichannel, serial-output ADC uses a sigma-delta modulator with a digital decimation filter to achieve true 16-bit accuracy. The user-selectable decimation factor of the digital filter allows the conversion resolution to be reduced in exchange for a higher output data rate. The device achieves true 16-bit performance at an output data rate of up to 480sps. In addition, the modulator sampling frequency may be optimized for either lowest power dissipation or highest throughput rate. The MAX1401 operates from +3V.
This device offers three fully differential input channels that can be independently programmed with a gain between +1V/V and +128V/V. Furthermore, it can compensate an input-referred DC offset (such as system offset) up to 117% of the selected full-scale range. These three differential channels may also be configured to operate as five pseudo-differential input channels. Two additional, fully differential system-calibration channels are provided for gain and offset error correction. External access is provided to the multiplexer (mux) output to facilitate additional signal processing.
The MAX1401 can be configured to sequentially scan all signal inputs and provide the results through the serial interface with minimum communications overhead. When used with a 2.4576MHz or 1.024MHz master clock, the digital decimation filter can be programmed to produce zeros in its frequency response at the line frequency and associated harmonics, ensuring excellent line rejection without the need for further postfiltering.
The MAX1401 is available in a 28-pin SSOP package.
Applications
- Loop-Powered Systems
- Portable Industrial Instruments
- Portable Weight Scales
- Pressure Sensors and Transducers
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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Overview of Sensor Signal Paths5/12/2010
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3V/5V DACs Support Intelligent Current Loop7/22/2002
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Specifying Quartz Crystals11/19/2001
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.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX1401CAI+ | Material Declaration | Reliability Data | 28-SSOP-5.3_MM | |
| MAX1401EAI+ | Material Declaration | Reliability Data | 28-SSOP-5.3_MM | |
| MAX1401EAI+T | Material Declaration | Reliability Data | 28-SSOP-5.3_MM | |
| Wafer Fabrication Data |
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