24-Bit, 10mW, 130dB SNR, 64ksps Delta-Sigma ADC with Integrated PGA

The MAX11270 is a 24-bit delta-sigma ADC that achieves excellent 130dB SNR while dissipating an ultra-low 10mW. Sample rates up to 64ksps allow both precision DC and AC measurements. Integral nonlinearity is guaranteed to 4ppm maximum. The THD is -122dB. The MAX11270 communicates via an SPI-compatible serial interface and is available in a small 24-pin TSSOP package.

The MAX11270 offers a 6.5nV/ noise programmable gain amplifier with gain settings between 1x to 128x. Optional buffers are also included to provide isolation of the signal inputs from the switched capacitor sampling network. This allows the MAX11270 to be used with high-impedance sources without compromising available dynamic range.

The MAX11270 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.

Applications

* ATE * High-Precision Portable Sensors * Medical Equipment * Scientific Instrumentation

* High Resolution for Instrumentation Applications that Require a Wide Dynamic Range

* 130dB SNR at 1.9sps

* 112dB SNR at 1000sps

* 20.4-Bit Noise-Free Resolution at 1.9sps

* 17.4-Bit Noise-Free Resolution at 1000sps

* Longer Battery Life for Portable Applications

* 2.4mA Operating Mode Current

* 4.4mA PGA Low-Noise Mode Current

* 1µA Sleep Current

* High Accuracy for DC Measurements

* 1ppm INL (typ), 4ppm (max)

* Single or Split Analog Supplies Provide Input Voltage Range Flexibility

* 2.7V to 3.6V (Single Supply) or ±1.8V (Split Supplies)

* Flexible High-Performance Filter Architecture Simplifies Design

* Programmable SINC Filter

* Enables System Integration

* Low-Noise PGA with Gains of 1, 2, 4, 8, 16, 32, 64, 128

* Signal Buffer Optional

* 3 General-Purpose I/Os

* Enables Integrated Part and System Calibration for Gain and Offset

* Robust 24-Pin TSSOP Packaging