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ADS1235-Q1 Automotive Delta-Sigma (ΔΣ) ADC for Bridge Sensors

Texas Instruments' analog-to-digital converter (ADC) features a low-noise PGA and programmable digital filter

Image of Texas Instruments' ADS1235-Q1 Automotive Delta-Sigma ADCTexas Instruments' ADS1235-Q1 precision, 7,200 SPS ΔΣ ADC features an integrated programmable gain amplifier (PGA). This device includes diagnostic features such as PGA over-range and reference monitors. The ADC provides high-accuracy, zero-drift conversion data for high-precision equipment such as weigh scales, strain gauges, and resistive pressure sensors.

The ADS1235-Q1 ADC has signal and reference multiplexers that support three differential signal inputs and two reference inputs. This device includes a low-noise PGA that provides gains of 1, 64, and 128. The ADC has a 24-bit ΔΣ modulator and programmable digital filter. The high-impedance inputs (1 GΩ) of the PGA reduce measurement error that is caused by sensor loading. The ADS1235-Q1 supports AC-bridge excitation to remove the drift errors from the sensor wiring. This ADC provides the clock control signals for the AC-excitation operation. The flexible digital filter is programmable for single-cycle settled conversions and provides 50 Hz and 60 Hz line cycle rejection at the same time. The device is available in a 5 mm × 5 mm VQFN package and is specified for a -40°C to +125°C temperature range.

Features
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: -40°C to +125°C, TA
  • 24-bit high-precision ADC:
    • Noise-free counts: 120,000 (10 mV input, 10 SPS)
    • Offset drift: 1 nV/°C
    • Gain drift: 0.5 ppm/°C
  • Three differential or five single-ended inputs
  • Two reference inputs
  • Wide input voltage range: ±7 mV to ±5 V
  • Low-noise PGA, gain: 1, 64, and 128
  • Data rate: 2.5 SPS to 7,200 SPS
  • AC- or DC-bridge excitation option
  • Chop-mode for zero-drift operation
  • Simultaneous 50 Hz and 60 Hz rejection-mode
  • Single-cycle settling mode
  • Missing reference input monitor
  • Signal over-range monitor
  • Temperature sensor
  • Cyclic redundancy check (CRC)
  • Power supply: 5 V or ±2.5 V
Applications
  • Onboard weighing systems (OBW)
  • Weigh scales and strain-gauge digitizers
  • Dynamic weigh systems
  • Pressure measurement

ADS1235-Q1 Automotive Delta-Sigma ADC

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
5V HIGH RESOLUTION 24-BIT 40KSPSADS1235QWRHMRQ15V HIGH RESOLUTION 24-BIT 40KSPS2951 - Immediate
6000 - Factory Stock
View Details

ADS1235 Delta-Sigma ADCs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC ADC 24BIT SIGMA-DELTA 32VQFNADS1235IRHBRIC ADC 24BIT SIGMA-DELTA 32VQFN0View Details
IC ADC 24BIT SIGMA-DELTA 32VQFNADS1235IRHBTIC ADC 24BIT SIGMA-DELTA 32VQFN278 - Immediate
4154 - Factory Stock
View Details

Evaluation Board

ImageManufacturer Part NumberDescriptionPart StatusNumber of A/D ConvertersNumber of BitsAvailable QuantityView Details
DEVELOPMENT DATA ACQUISITIONADS1235EVMDEVELOPMENT DATA ACQUISITIONActive1244 - Immediate
25 - Factory Stock
View Details
Published: 2019-12-31