24bit sigma-delta ADC slashes footprint

24bit sigma-delta ADC slashes footprint

New Products |
By Nick Flaherty

Texas Instruments (TI) has launched a 24bit wideband analog-to-digital converter (ADC) that it says I the smallest in the industry

In a 3 x 3mm quad flat no-lead (WQFN) package, the ADS127L11 delta-sigma (ΔΣ) ADC is half the size of the previous device, with power consumption, resolution and measurement bandwidth optimised for a wide range of industrial systems.

The ADS127L11 has data rates up to 400 kSPS using the wideband filter and up to 1067 kSPS using the low-latency filter. It integrates input and reference buffers to reduce signal loading and a low-drift modulator provides DC precision with low in-band noise.

The digital filter is configurable for wideband or low[1]latency operation, allowing wideband ac performance or data throughput for dc signals to be optimized, all in one device. The serial interface features daisy-chain capability to reduce the SPI I/O over an isolation barrier and input and output data and register settings are validated by a cyclic-redundancy check (CRC) feature to enhance operational reliability.

In low-latency mode, the ADS12711 delivers 25 percent lower latency at up to 1,067 kSPS and 83.3 pecent lower offset drift of 50 nV/°C for data acquisition and condition-monitoring applications.

Until now, miniaturized, battery-powered industrial equipment designers had to choose between an ADC’s size and measurement precision at higher frequencies.

The ADS127L11 consumes 18.6 mW in high-speed mode or 3.3 mW in the low power mode with sampling rates up to 50 kSPS, improving signal resolution and battery life for designs such as portable electroencephalogram (EEG) machines and power-quality analyzers to better optimize power consumption against bandwidth requirements using the device’s power-scalable modes.

“There is a clear trend toward smaller solution size and lower power consumption in applications such as test and measurement equipment and portable medical devices, where improved battery life is imperative,” said Noman Akhtar, senior research analyst, Omdia. “There is an urgency to provide increased data throughput, higher bandwidth and lower power, all in a smaller footprint.”

The device is fully specified for operation over the –40°C to +125°C temperature range.

The ADS127L11 is available for purchase on, and comes in a 20-pin, 3-mm-by-3-mm WQFN package or a 20-pin, 6.5-mm-by-4.4-mm thin shrink small-outline package (TSSOP). Pricing starts at US$5.75 in 1,000-unit quantities. Evaluation modules are available on for US$149.00.

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