Texas 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
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Texas 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.
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