Low noise 24bit ADC eliminates external amplifier

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By eeNews Europe

The ISL26102 and ISL26104 are 24bit ADCs that offer an on-chip ultra-low noise programmable gain amplifier. The ADCs’ wide PGA gain range facilitates direct connection to load cells, thermocouples and other popular sensors with a wide variety of sensitivities.
The devices feature best-in-class noise performance through their entire output word rate range from 2.5 to 4,000SPS, delivering system flexibility unmatched by competitive devices. The ISL26102 and ISL26104 provide two-channel and four-channel input multiplexers, respectively, and are designed for instrumentation such as weighing systems and temperature monitoring and control. They provide designers of these precision instruments the ability to digitize, with unmatched accuracy, small signals from low cost sensors, without the added cost and complexity of external amplifiers and signal conditioning circuits.
With less than 8nV/√Hz at 128x gain and 50mW power dissipation during conversions and 1μA shutdown mode, the low side power switch lets users shut off load cell current to reduce consumption. The device have robust ESD ratings exceeding 8kV HBM and use bidirectional SPI-compatible serial digital interfaces to enable easy connection to an MCU or FPGA.
Intersil has demonstrated a precision temperature and strain gauge AFE paired with a RL78/G13 Renesas microcontroller that in addition to the ISL26102 combined the ISL28617 40V Instrumentation Amplifier, ISL21090, low noise precision voltage reference, ISL28134, 5V Low Noise Zero-Drift Op Amp, and ISL22317 DCP to create turnkey solutions for both temperature and strain applications.
The ISL26102 and ISL26104 are available now in 24-lead TSSOP packages and are priced at $5.45 and $5.95 each, respectively, in 1,000-unit quantities.


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