ADS1261 24-Bit, 40kSPS, 10-Ch Delta-Sigma ADC w/ PGA, Vref, 2x IDACs, & AC Excitation for Factory Automation | TI.com

ADS1261 (ACTIVE)

24-Bit, 40kSPS, 10-Ch Delta-Sigma ADC w/ PGA, Vref, 2x IDACs, & AC Excitation for Factory Automation

 

Description

The ADS1260 and ADS1261 (ADS126x) are precision, 40-kSPS, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with an integrated programmable gain amplifier (PGA) and internal fault monitors. The sensor-ready ADCs provide a high-accuracy, single-chip solution for the most demanding measurements, including weigh scales and resistance temperature devices (RTD).

The ADCs are comprised of an input signal multiplexer, a low-noise PGA, providing gain from 1 to 128, a 24-bit ΔΣ modulator, and a programmable digital filter.

The high-impedance PGA inputs (1 GΩ) reduce measurement error caused by sensor loading. The ADS1260 supports three differential or five single-ended inputs. The ADS1261 supports five differential or 10 single-ended inputs. The integrated current sources simplify the measurement of RTDs.

The flexible digital filter is programmable for single-cycle settled conversions, while providing simultaneous 50-Hz and 60-Hz line cycle rejection. Signal and reference monitors, a temperature sensor, and CRC data verification enhance data reliability.

The ADS126x are pin compatible devices offered in a 5-mm × 5-mm QFN package and are specified over the –40°C to +125°C temperature range.

Features

  • 24-Bit, High-Precision ADCs
    • Offset Drift: 1 nV/°C
    • Gain Drift: 0.5 ppm/°C
    • Noise: 30 nVRMS (20 SPS, Gain = 128)
    • Linearity: 2 ppm
  • CMOS PGA Gain: 1 to 128
  • Wide Input Voltage Range: ±7 mV to ±5 V
  • Data Rate: 2.5 SPS to 40 kSPS
  • Simultaneous 50-Hz and 60-Hz Rejection Mode
  • Single-Cycle Settling Mode
  • Signal and Reference Monitors
  • 5-V or ±2.5-V Power Supply
  • Internal Temperature Sensor
  • Cyclic Redundancy Check
  • Excitation Current Sources
  • Sensor Burn-Out Current Sources
  • Four General-Purpose Input/Outputs (ADS1261)
  • AC Excitation for Bridge Sensors (ADS1261)
  • 5-mm × 5-mm QFN Package

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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
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
ADS1261 ADS124S06 ADS124S08 ADS1262 ADS1263
24     24     24     32     32    
40     4     4     38     38    
10     6     12     10     10    
SPI     SPI     SPI     SPI     SPI    
-40 to 125     -50 to 125     -50 to 125     -40 to 125     -40 to 125    
VQFN | 32     TQFP | 32
VQFN | 32    
TQFP | 32
VQFN | 32    
TSSOP | 28     TSSOP | 28    
6.80 | 1ku     4.75 | 1ku     5.25 | 1ku     8.90 | 1ku     9.90 | 1ku    
24     1.75     1.75     27     27    
32VQFN: 25 mm2: 5 x 5 (VQFN | 32)     32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
32VQFN: 25 mm2: 5 x 5 (VQFN | 32)    
32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
32VQFN: 25 mm2: 5 x 5 (VQFN | 32)    
28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Multiplexed     Multiplexed     Multiplexed     Multiplexed     Multiplexed    
Ext
Int    
Ext
Int    
Ext
Int    
Ext
Int    
Ext
Int    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
2.5
5    
2.625
5.25    
2.625
5.25    
2.5
5    
2.5
5    
-2.5
0    
-2.625
0    
-2.625
0    
-2.5
0    
-2.5
0    
-2.5
4.75    
2.7     2.7     4.75     4.75    
2.5
5.25    
5.25     5.25     5.25     5.25    
2.7     2.7     2.7     2.7     2.7    
5.25     3.6     3.6     5.25     5.25    
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