ADS127L01 - 24-Bit, 512kSPS, 1-Ch, Very-Low-Power, Wide-Bandwidth Delta-Sigma ADC

The ADS127L01 is a 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) with data rates up to 512 kSPS. This device offers a unique combination of excellent dc accuracy and outstanding ac performance. The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The integrated decimation filter suppresses modulator out-of-band noise. In addition to al low-latency filter, the ADS127L01 provides multiple Wideband filters with less than ±0.00004 dB of ripple, and an option for –116-dB stop-band attenuation at the Nyquist rate.

Traditionally, industrial delta-sigma ADCs that offer good drift performance use digital filters with large passband droop. As a result, industrial delta-sigma ADCs have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than industrial counterparts. The ADS127L01 combines these converters, providing high-precision industrial measurement with excellent dc and ac specifications over an extended industrial temperature range of –40°C to +125°C.

A variety of operating modes allow for optimization of speed, resolution, and power. A programmable serial interface with one of three options (SPI, frame-sync slave, or frame-sync master) provides convenient interfacing across isolation barriers to microcontrollers or digital signal processors (DSPs).

• Data Rates: Up to 512 kSPS
• AC + DC Performance:
  • Passband: Up to 230 kHz
  • SNR: Up to 115.5 dB
  • THD: Down to –129 dB
  • DC Accuracy:
  • Offset Drift: 1.5 µV/°C
  • Gain Drift: 0.2 ppm/°C
• Operating Modes:
  • High-resolution (128 kSPS at 26 mW)
  • Low-power (128 kSPS at 15 mW)
  • Very-low Power: 105 dB SNR (128 kSPS at 9 mW)
• Digital Filter Options:
  • Low-latency Filter: Sinc Frequency Response
  • Wideband 1 Filter:
    (0.45 to 0.55) × f_DATA Transition Band
  • Wideband 2 Filter: (0.40 to 0.50) × f_DATA Transition Band
• SPI™ or Frame-Sync Serial Interface
  • Daisy-Chain Compatible
• Analog Supply: 2.7 V to 3.6 V
• Digital Supply: 1.7 V to 3.6 V
• Operating Temperature: –40°C to +125°C