24-Bit, 5mW, 140dB SNR, 32ksps Delta-Sigma ADC with Integrated PGA

The MAX11214 is a 24-bit delta-sigma ADC that achieves excellent 140dB SNR while dissipating an ultra-low 5mW. Sample rates up to 32ksps allow both precision DC and AC measurements. Integral nonlinearity is guaranteed to 4ppm maximum. The THD is -122dB. The MAX11214 communicates via an SPI-compatible serial interface and is available in a small 24-pin TSSOP package.

The MAX11214 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 MAX11214 to be used with high-impedance sources without compromising available dynamic range.

The MAX11214 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 * Seismic Data Acquisition

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

* 134dB SNR at 15.6sps

* 124dB SNR at 500sps

* 21-Bit Noise-Free Resolution at 50sps

* 18.6-Bit Noise-Free Resolution at 1ksps

* Longer Battery Life for Portable Applications

* 1.2mA Operating Mode Current from AVDD

* 2.6mA PGA Low-Noise Mode Current from AVDD

* 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 + FIR + IIR

* Linear or Minimum Phase Response

* Programmable Highpass Filter

* Selectable FIR Data Rates: 62.5sps to 8ksps

* 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 Capability for Gain and Offset

* Robust 24-Pin TSSOP Packaging