ADS1235 24-bit, 7.2kSPS, 5-ch delta-sigma ADC with PGA and AC excitation for low-noise bridge sensors | TI.com

ADS1235
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24-bit, 7.2kSPS, 5-ch delta-sigma ADC with PGA and AC excitation for low-noise bridge sensors

 

Description

The ADS1235 is a precision, 7200-SPS, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with an integrated programmable gain amplifier (PGA). This device also includes diagnostic features such as PGA overrange and reference monitors. The ADC provides high-accuracy, zero-drift conversion data for high-precision equipment, including weigh scales, strain gauges, and resistive pressure sensors.

The ADC has signal and reference multiplexers that support three differential signal inputs and two reference inputs. The ADC also includes a low-noise PGA that provides gains of 1, 64, and 128. The ADC also 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 ADC supports ac-bridge excitation to remove the drift errors from the sensor wiring. The 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 ADS1235 is available in a 5-mm × 5-mm QFN package, and is specified across the –40°C to +125°C temperature range.

 

Features

  • 24-Bit, High-Precision ADC
    • 120,000 Noise-Free Counts
      (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 7200 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 Overrange Monitor
  • Temperature Sensor
  • Cyclic Redundancy Check (CRC)
  • 5-V or ±2.5-V Power Supply

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Parametrics

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Part number Order Resolution (Bits) Sample rate (Max) (kSPS) Number of input channels Interface Operating temperature range (C) Package Group Approx. price (US$) Power consumption (Typ) (mW) Package size: mm2:W x L (PKG) Architecture Input type Multi-channel configuration Reference mode Features Input range (Max) (V) Input range (Min) (V) Analog voltage AVDD (Min) (V) Analog voltage AVDD (Max) (V) Digital supply (Min) (V) Digital supply (Max) (V) Rating
ADS1235 Order now 24     7.2     5     SPI     -40 to 125     VQFN | 32     4.80 | 1ku     23     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)     Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext     50/60 Hz Rejection
GPIO
Oscillator
PGA
Temp Sensor    
2.5
5    
-2.5
0    
-2.5
4.75    
2.5
5.25    
2.7     5.25     Catalog    
ADS1232 Order now 24     0.08     2     SPI     -40 to 105     TSSOP | 24     3.90 | 1ku     4.3     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)     Delta-Sigma     Differential     Multiplexed     Ext     50/60 Hz Rejection
Oscillator
PGA    
2.5     0     2.7     5.3     2.7     5.3     Catalog    
ADS1234 Order now 24     0.08     4     SPI     -40 to 105     TSSOP | 28     4.25 | 1ku     4.3     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     Delta-Sigma     Differential     Multiplexed     Ext     50/60 Hz Rejection
Oscillator
PGA    
2.5     0     2.7     5.3     2.7     5.3     Catalog