24-Bit, 6-Channel, 64ksps, 6.2nV/√Hz PGA, Delta-Sigma ADC with SPI Interface

 

Part Number	Replacement	Explanation

Description

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The MAX11254 is a 6-channel, 24-bit delta-sigma ADC that achieves exceptional performance while consuming very low power. Sample rates up to 64ksps allow precision DC measurements. The MAX11254 communicates via a SPI serial interface and is available in a small (5mm x 5mm) TQFN package.

The MAX11254 offers a 6.2nV/ noise programmable gain amplifier (PGA) with gain settings from 1x to 128x. The integrated PGA provides isolation of the signal inputs from the switched capacitor sampling network. The PGA also enables the MAX11254 to interface directly with high-impedance sources without compromising available dynamic range.

The MAX11254 operates from a single 2.7V to 3.6V analog supply, or split ±1.8V analog supplies, allowing the analog input to be sampled below ground. The digital supply range is 1.7V to 2.0V or 2.0V to 3.6V, allowing communication with 1.8V, 2.5V, 3V, or 3.3V logic.

Design Solution: Automotive Touch-Screen Sensing: It’s All About Your ADC ›

MAX11254: Functional Diagram Enlarge+

Key Features

• High Resolution for Industrial Applications that Require a Wide Dynamic Range
  • 133dB SNR at 50sps
  • 124dB SNR at 1000sps
• Longer Battery Life for Portable Applications
  • 2.2mA Operating Mode Current
  • 1µA Sleep Current
• Single or Split Analog Supplies Provide Input Voltage Range Flexibility
  • 2.7V to 3.6V (Single Supply) or ±1.8V (Split Supply)
• Enables System Integration
  • Low Noise, 6.2nV/√Hz PGA with Gains of 1, 2, 4, 8, 16, 32, 64, 128
  • 6-Channel, Fully Differential Input
• Enables On-Demand Device and System Gain and Offset Calibration
  • User-Programmable Offset and Gain Registers
• Robust Performance in a Small Package
  • -40°C to +125°C Operating Temperature Range
  • TQFN Package, 5mm x 5mm
• AEC-Q100 Qualified, Refer to Ordering Information for List of /V Parts

Applications/Uses

• Analog I/O for Programmable Logic Controllers
• Automotive
• Battery-Powered Instrumentation
• Pressure Sensors
• Weigh Scales