MAX11284
Dual 24-Bit, Low-Power, High-SNR,
4ksps Delta-Sigma ADCs with Integrated PGAs
General Description
Benefits and Features
● High Resolution for Instrumentation Applications That
The MAX11284 is a dual 24-bit delta sigma ADC that
achieves excellent SNR while dissipating a low 3.6mW per
ADC. Precision DC and AC measurements can be made at
sample rates up to 4ksps. Integral nonlinearity is guaranteed
to 4ppm maximum and the THD is -120dB. The MAX11284
communicates through an SPI-compatible serial interface
and is available in a small, 40-pin TQFN package.
Require a Wide Dynamic Range
• 131dB SNR at 31.25sps in Buffer Mode
• 114dB SNR at 2000sps in Buffer Mode
● Low Power
• Digital Current with FIR Filter, 1ksps: 500µA
• Analog Current PGA Low-Power Mode: 2.1mA
• Sleep Current: 1.2μA
The PGAs can operate in either low-noise (9.1nV/√Hz)
or low-power (13.6nV/√Hz) mode, and have selectable
gain values ranging from 1x to 128x. Optional buffers are
also included to provide isolation of the signal inputs from
the switched capacitor sampling network. This allows the
ADCs to be used with high-impedance sources without
compromising available dynamic range.
● High Accuracy for DC Measurements
• 1ppm INL (typ), 4ppm (max)
● Single/Split Analog Supplies Provide Input Voltage
Range Flexibility
• 2.7V to 3.6V (Single-Supply) or ±1.8V (Split Supplies)
● Digital Filters
The MAX11284 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 2.0V to 3.6V, allowing communication with
2.5V, 3V, or 3.3V logic.
• Programmable SINC + FIR + IIR
• Linear/Minimum Phase Response
• Programmable High-Pass Filter
• Selectable FIR Data Rates: 31.25sps to 4ksps
● Enables System Integration
• Low-Noise and Low-Power mode PGA with Gains
of 1, 2, 4, 8, 16, 32, 64, 128
Applications
● Seismic Data Acquisition
● Scientific Instrumentation
● High-Precision Portable Sensors
● Medical Equipment
● ATE
• Signal Buffer Optional
• 2 General-Purpose I/Os
● Integrated Offset and Gain Self-Calibration and
System Gain and Offset Calibration Registers
● Small 40-Pin TQFN Package
Ordering Information appears at end of data sheet.
19-8268; Rev 0; 4/16