32-bit Δ-Σ ADCs offer high accuracy, low noise and high integration
Suggested uses include programmable logic controllers, industrial automation and sensor measurement: the highly integrated, sensor-ready ADS1262 and ADS1263 also remove the need for external components that increase system cost and degrade noise and drift performance.
TI adds that system designers who needed a high-resolution ADC have had to sacrifice other desired specifications, such as low noise or low offset drift, as well as several integrated features. The ADS1262 and ADS1263 eliminate these trade-offs by providing 32-bit resolution, along with integration, fault-detection features, a fast data rate and wide temperature range, to help maximise the performance of programmable logic controllers (PLCs), industrial automation equipment and sensor-measurement applications.
Accurate measurements of small signals is enabled by resolution of 32 bits and noise of 7 nVRMS at 2.5 SPS, enabling measurement of the smallest signals, which is essential for bridge applications where typical full-scale signals are 10 mV or less. Offset error drift is also 80% lower than alternative solutions, ensuring measurement stability over the entire temperature range.
The ADS1262 integrates a programmable gain amplifier (PGA), 2.5-V reference, oscillator, level shifter, temperature sensor, dual-excitation current sources (IDACs) and eight general-purpose input/output (GPIO) pins. The ADS1263 adds an auxiliary 24-bit delta-sigma ADC for systems needing parallel main-channel conversions, sensor-temperature compensation or sensor diagnostics.
Features such as internal signal-chain monitoring, data-error detection, sensor-burnout detection and a test digital-to-analogue converter (DAC) provide the internal and external fault detection and diagnostics necessary for high-reliability systems, with integrated monitoring. A white paper outlines how to use the ADS1262 and ADS1263’s integrated diagnostics to help improve system reliability.
A maximum output data rate of 38 ksamples/sec enables the ADCs to be used in high-data-throughput industrial applications, and operating temperature range of -40°C to +125C is 20C wider than competing products.
TI has a range of support tools for the ADS1262 and ADS1263, including a TI Designs reference design for high resolution, low drift precision weigh scale measurements using AC bridge excitation.
The ADS1262 and ADS1263 provide complete support suites that are available for system designers, including samples, an IBIS model, an Excel calculator tool that aids in device configuration, and performance development kits (PDKs). The ADS1262EVM-PDK and the ADS1263EVM-PDK are available for $199.
Engineers designing with data converters like the ADS1262 and ADS1263 can also visit TI’s Data Converter Learning Center for information on delta-sigma ADC basics, ADC noise analysis and filtering, and driving ADCs.
The ADS1262, in a 9.7 x 6.4-mm TSSOP is $9.10. The ADS1263 is $12.65 (1000).
Texas instruments; www.ti.com/ads1262-pr
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