[原创] Maxim MAX11270 24位Delta－Sigma ADC测量参考设计

Maxim公司的MAX11270是 24位Delta-Sigma ADC,具有极好的130dB SNR和超低10mW功耗,提供6.5nV/√Hz噪音可编增益放大器,增益设定在1和128之间,主要用在科学仪器,高精度手持传感器,医疗设备和自动测试设备(ATE).本文介绍了MAX11270主要特性和优势,框图和应用框图,以及评估板MAXREFDES75#主要特性,框图,电路图,材料清单和PCB设计图.

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/√Hz 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.
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