ADS125H01 24-bit, 40-kSPS, 1-ch delta-sigma ADC with ±20-mV to ±20-V input | TI.com

ADS125H01 (PREVIEW) 24-bit, 40-kSPS, 1-ch delta-sigma ADC with ±20-mV to ±20-V input

 

Sample availability

Production samples are available for the ADS125H02, which is a pin- and performance-compatible superset device that integrates a voltage reference, excitation current sources (IDACs), and GPIOs. Order now

Description

The ADS125H01 is a ±20-V input, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC). The ADC features a low-noise programmable gain amplifier (PGA), a clock oscillator, and signal or reference out-of-range monitors.

The integration of a wide input range, ±18-V supply PGA and an ADC into a single package reduces board area up to 50% compared to discrete solutions.

Programmable gains of 0.125 to 128 (corresponding to an equivalent input range from ±20 V to ±20 mV) eliminates the need for an external attenuator or external gain stages. A 1-GΩ minimum input impedance reduces error caused by sensor loading. Additionally, the low noise and low drift performance allow direct connections to strain-gauge bridge and thermocouple sensors that are affected by high common-mode voltage.

The digital filter attenuates 50-Hz and 60-Hz line cycle noise for data rates ≤ 50 SPS or 60 SPS to reduce measurement error. The filter also provides no-latency conversion data for high data throughput during channel sequencing.

The ADS125H01 is housed in a 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +125°C temperature range.

Features

  • ±20-V input, 24-bit delta-sigma ADC
  • Programmable data rate: 2.5 SPS to 40 kSPS
  • High-voltage, 1-GΩ input impedance PGA:
    • Differential input range: up to ±20 V
    • Common-mode input voltage: up to ±15.5 V
    • Programmable gain: 0.125 to 128
  • High-performance ADC:
    • Noise: 45 nVRMS (gain = 128 SPS, 20 SPS)
    • CMRR: 105 dB
    • 50-Hz and 60-Hz rejection: 95 dB
    • Offset drift: 10 nV/°C
    • Gain drift: 1 ppm/°C
    • INL: 2 ppm
  • Integrated features and diagnostics:
    • Clock oscillator: 2.5% error (maximum)
    • Signal and reference voltage monitors
    • Cyclic redundancy check (CRC)
  • Power supplies:
    • AVDD: 4.75 V to 5.25 V
    • DVDD: 2.7 V to 5.25 V
    • HVDD: ±5 V to ±18 V
  • Operating temperature: –40°C to +125°C
  • 5-mm × 5-mm VQFN package

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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
ADS125H01 Order now 24     40     1     SPI     -40 to 125     VQFN | 32       45     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)     Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext     50/60 Hz Rejection
Oscillator
PGA
Small Size    
15.5     0     -18
0    
18
36    
2.7     5.25     Catalog    
ADS124S08 Order now 24     4     12     SPI     -50 to 125     TQFP | 32
VQFN | 32    
5.25 | 1ku     1.75     32TQFP: 49 mm2: 7 x 7 (TQFP | 32)
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    
2.625
5.25    
-2.625
0    
2.7     5.25     2.7     3.6     Catalog    
ADS125H02 Order now 24     40     2     SPI     -40 to 125     VQFN | 32     7.90 | 1ku     45     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    
15.5     0     -18
0    
18
36    
2.7     5.25     Catalog    
ADS1261 Order now 24     40     10     SPI     -40 to 125     VQFN | 32     6.80 | 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     Catalog