ADS1235-Q1 Automotive 24-bit, 7.2-kSPS, 3-ch differential input, delta-sigma ADC with PGA and AC excitation | TI.com

ADS1235-Q1
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Automotive 24-bit, 7.2-kSPS, 3-ch differential input, delta-sigma ADC with PGA and AC excitation

 

Description

The ADS1235-Q1 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-Q1 is available in a 5-mm × 5-mm VQFN package, and is specified across the –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:
    • 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-Q1 Order now 24     7.2     5     SPI     -40 to 125     VQFN | 32     5.66 | 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     Automotive    
ADS1260-Q1 Order now 24     40     5     SPI     -40 to 125     VQFN | 32     7.67 | 1ku     20     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)     Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext
Int    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
2.5
5    
-2.5
0    
-2.5
4.75    
2.5
5.25    
2.7     5.25     Automotive    
ADS1261-Q1 Order now 24     40     10     SPI     -40 to 125     VQFN | 32     8.85 | 1ku     20     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)     Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext
Int    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
2.5
5    
-2.5
0    
-2.5
4.75    
2.5
5.25    
2.7     5.25     Automotive