ADS125H02

VQFN (RHB)

32

25 mm² 5 x 5

±20-V input, 24-bit delta-sigma ADC
Programmable data rate: 2.5 SPS to 40 kSPS
High-voltage, high-impedance PGA:
- Differential input range: up to ±20 V
- Programmable gain: 0.125 to 128
- Common-mode input voltage: up to ±15.5 V
- Input impedance: 1 GΩ (minimum)
High-performance ADC:
- Input noise: 45 nV_RMS (20 SPS)
- CMRR: 105 dB
- Normal-mode rejection at 50 Hz, 60 Hz: 95 dB
- Offset drift: 5 nV/°C
- Gain drift: 1 ppm/°C
- INL: 2 ppm
Integrated features and diagnostics:
- 2.5-V reference: 3 ppm/°C drift
- Clock oscillator: 2.5% error (maximum)
- Excitation current sources
- GPIO to drive external mux
- 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

±20-V input, 24-bit delta-sigma ADC
Programmable data rate: 2.5 SPS to 40 kSPS
High-voltage, high-impedance PGA:
- Differential input range: up to ±20 V
- Programmable gain: 0.125 to 128
- Common-mode input voltage: up to ±15.5 V
- Input impedance: 1 GΩ (minimum)
High-performance ADC:
- Input noise: 45 nV_RMS (20 SPS)
- CMRR: 105 dB
- Normal-mode rejection at 50 Hz, 60 Hz: 95 dB
- Offset drift: 5 nV/°C
- Gain drift: 1 ppm/°C
- INL: 2 ppm
Integrated features and diagnostics:
- 2.5-V reference: 3 ppm/°C drift
- Clock oscillator: 2.5% error (maximum)
- Excitation current sources
- GPIO to drive external mux
- 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

The ADS125H02 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), an internal reference, clock oscillator, and signal or reference out-of-range monitors.

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

Programmable gain 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. 1-GΩ minimum input impedance reduces error caused by sensor loading. Additionally, the low noise and low drift performance allow direct connections to bridge, resistance temperature detector (RTD), and thermocouple sensors.

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 ADS125H02 is housed in a 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +125°C temperature range.

The ADS125H02 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), an internal reference, clock oscillator, and signal or reference out-of-range monitors.

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

Programmable gain 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. 1-GΩ minimum input impedance reduces error caused by sensor loading. Additionally, the low noise and low drift performance allow direct connections to bridge, resistance temperature detector (RTD), and thermocouple sensors.

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 ADS125H02 is housed in a 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +125°C temperature range.

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Technical documentation

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	Type	Title	Date
*	Data sheet	ADS125H02 ±20-V Input, 2-Channel, 40-kSPS, 24-Bit, Delta-Sigma ADC With PGA and Voltage Reference datasheet (Rev. C)	17 Jun 2019
	Technical article	How smart AFEs offer an integrated analog solution for thermoelectric cooling control	04 Jan 2022
	Application note	ADS124S08 3-Wire PT100 RTD Measurement Circuit w/ Low-Side Reference and 1 IDAC (Rev. B)	09 Sep 2021
	Application note	Communication Methods for Data Integrity Using Delta-Sigma Data Converters (Rev. A)	23 Aug 2021
	Application note	RTD Wire-Break Detection Using Precision Delta-Sigma ADCs	18 Feb 2021
	E-book	Fundamentals of Precision ADC Noise Analysis	19 Jun 2020
	Application note	4-Ch, diff. in., DAQ front-end circuit w/ configurable voltage & current inputs	03 Dec 2019
	Application note	Simplified ±10 V Analog Input Module Using the ADS125H02	08 May 2019
	User guide	ADS125H02 Evaluation Module User's Guide (Rev. A)	10 Apr 2019
	Application note	K-type thermocouple measurement circuit with precision ADC	19 Mar 2019
	Application note	A Basic Guide to Thermocouple Measurements	28 Sep 2018
	Application note	A Basic Guide to RTD Measurements	19 Jun 2018
	Technical article	Does a low-leakage multiplexer really matter in a high-impedance PLC system?	19 Feb 2016

Design & development

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Evaluation board

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