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Texas Instruments ADS1235IRHBR
- Part No.:
- ADS1235IRHBR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS1235IRHBR.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,418
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Product details
Overview
ADS1235IRHBR from Texas Instruments is a precision 24-bit delta-sigma ADC with integrated PGA, designed for bridge sensor signal conditioning in high-accuracy weigh scale and pressure measurement systems. It delivers 120,000 noise-free counts at 10 mV input and 10 SPS, features ±7 mV to ±5 V input range, gain options of 1/64/128, and operates across –40°C to +125°C.
For engineers reviewing the ADS1235IRHBR datasheet, ADS1235IRHBR pinout, ADS1235IRHBR application, or ADS1235IRHBR equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts, and supply-ready availability details - all grounded in TI's SBAS824 production data sheet.
Technical Context
The ADS1235IRHBR integrates a low-noise PGA (1 GΩ input impedance), dual reference multiplexer, AC/DC bridge excitation control, and a programmable Sinc4 digital filter supporting simultaneous 50-Hz and 60-Hz line rejection. Its chop mode enables zero-drift operation with <1 nV/°C offset drift and 0.5 ppm/°C gain drift.
It supports three differential or five single-ended analog inputs, includes internal temperature sensing (420 µV/°C), reference and signal overrange monitors, CRC error checking, and flexible power sequencing (AVDD = 4.75–5.25 V, DVDD = 2.7–5.25 V). The internal oscillator runs at 7.3728 MHz ±0.5%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes output - ensures full dynamic range utilization without code gaps in precision weighing applications. |
| Data Rate | 2.5–7200 SPS - selectable for trade-off between noise performance (e.g., 120,000 noise-free counts at 10 SPS) and throughput. |
| PGA Gain | 1, 64, or 128 - enables direct interface to low-output bridge sensors (e.g., ±7 mV) while maintaining >100 dB SNR at gain=128. |
| Input Range | ±7 mV to ±5 V differential - accommodates both microvolt-level strain gauges and higher-voltage industrial sensors without external amplification. |
| Offset Drift | 1 nV/°C (chop mode) - eliminates thermal zero-shift errors critical for unattended industrial weighing systems over wide temperature ranges. |
| CMRR | 130 dB at 20 SPS - rejects common-mode interference from noisy industrial environments, preserving signal integrity in 3-wire bridge configurations. |
| Power Supply | AVDD = 4.75–5.25 V, DVDD = 2.7–5.25 V - supports mixed-supply designs and simplifies LDO selection in battery- or mains-powered instrumentation. |
Pinout & Package
The ADS1235IRHBR is housed in a thermally enhanced 5-mm × 5-mm VQFN-32 package (RHB) with exposed thermal pad soldered to AVSS for optimal heat dissipation in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN5 | Analog input / GPIO / ACX | Configurable as differential inputs (e.g., AIN0/AIN1), single-ended channels, or AC bridge excitation outputs - enables flexible sensor interfacing without external switches. |
| REFP0 / REFN0 | Differential reference input | Accepts 0.9–(AVDD–AVSS) V reference voltage - supports ratiometric measurements using same excitation source as bridge, eliminating reference drift impact. |
| CAPP / CAPN | PGA output pair | Requires 4.7-nF C0G capacitor across pins - forms anti-aliasing filter with internal PGA bandwidth (~60 kHz), reducing external component count. |
| SCLK / DIN / DOUT/DRDY / CS | Serial interface signals | Standard SPI-compatible 4-wire interface with DRDY dual-function - allows simple microcontroller integration and real-time conversion status monitoring. |
| PWDN / RESET / START | Digital control inputs | Asynchronous power-down (µA quiescent), hardware reset, and conversion trigger - supports low-power sleep modes and deterministic timing control. |
| BYPASS | Internal regulator bypass | Connect 1-µF capacitor to DGND - stabilizes internal analog subregulator, improving PSRR and reducing supply-induced noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Chop mode zero-drift architecture | Reduces offset drift to 1 nV/°C - enables stable long-term calibration in static load cells without periodic re-zeroing. |
| Simultaneous 50/60-Hz rejection | Eliminates mains-borne interference without notch filters or software post-processing - critical for factory-floor deployment. |
| AC-bridge excitation support | Generates phase-controlled AC drive signals (ACX1/ACX2) - removes thermoelectric and cable drift errors in remote strain-gauge installations. |
| Integrated temperature sensor | 420 µV/°C output with ±1.5°C accuracy - enables on-chip thermal compensation of sensor nonlinearity and gain drift. |
| Signal & reference overrange monitors | Detects out-of-range conditions on AINx and REFP0/REFN0 - prevents saturation-induced measurement loss and supports fault-safe system design. |
| Cyclic Redundancy Check (CRC) | Validates serial data integrity end-to-end - essential for safety-critical weight verification in medical or industrial control systems. |
Applications
| Dynamic Weighing Systems | Weigh Scales and Strain-Gauge Digitizers |
|---|---|
Use Scenario: High-speed conveyor-based parcel weighing where vibration and transient loading require rapid settling and noise immunity. IC Role / Device Role / Timing Role: Primary ADC with single-cycle settling mode and 7200-SPS capability - captures stable readings within milliseconds after mechanical disturbance. Use Value: Enables accurate weight capture at >100 units/minute without mechanical dampening, reducing system footprint and maintenance. |
Use Scenario: Platform scales for commercial retail or warehouse inventory requiring NTEP-certified accuracy and long-term stability. IC Role / Device Role / Timing Role: Precision front-end converter with 120,000 noise-free counts and <1 nV/°C drift - serves as the metrological core for Class III/III L certification. Use Value: Eliminates annual recalibration cycles by maintaining ±0.001% FSR accuracy over –40°C to +85°C ambient range. |
| Pressure Measurement | Process Analytics |
Use Scenario: Differential pressure transducers in HVAC or cleanroom monitoring, subject to EMI and thermal gradients. IC Role / Device Role / Timing Role: Signal conditioner with 130 dB CMRR and simultaneous 50/60-Hz rejection - rejects ground-loop noise and mains harmonics in shared building infrastructure. Use Value: Delivers stable 0.05% FS pressure resolution without shielded cabling or external filtering, lowering BOM cost by 30%. |
Use Scenario: Real-time composition analysis in chemical reactors using resistive sensor arrays with varying output levels. IC Role / Device Role / Timing Role: Multi-channel configurable ADC with 3-diff/5-SE inputs and programmable PGA - supports mixed-sensor types (load cell, RTD, bridge) on single PCB. Use Value: Reduces channel count and board area by 40% versus discrete ADC + amplifier solutions while enabling per-channel gain optimization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1232IRHBR | 2-channel differential input, no AC-excitation outputs, identical PGA and noise specs. | Lacks AIN2–AIN5 GPIO/ACX functionality - unsuitable for multi-bridge or AC-driven sensor systems. | Select when only two bridge inputs are needed and board space is constrained; shares same RHB package and register map. |
| AD7195BRUZ | 4.8 kHz max data rate, 24-bit, 50/60-Hz rejection, but requires external crystal and has no integrated AC-excitation logic. | No native AC bridge drive - demands external H-bridge drivers and timing control, increasing design complexity and component count. | Choose for legacy ADI ecosystem compatibility or when ultra-low power (<1 mW) is prioritized over AC-excitation integration. |
Compared with ADS1232IRHBR and AD7195BRUZ, the ADS1235IRHBR uniquely combines 3-differential-input flexibility, on-chip AC-excitation generation, and zero-drift chop mode - making it the only solution that eliminates external excitation circuitry while maintaining NTEP-grade stability in dynamic weighing.
Availability
ADS1235IRHBR is available at Aetrix Electronics and suitable for dynamic weighing systems, industrial pressure transmitters, NTEP-certified platform scales, and process analytics instrumentation requiring stable component supply and long-lifecycle assurance.
Supply support for ADS1235IRHBR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data acquisition and industrial signal chain solutions.
The ADS1235IRHBR belongs to TI's high-precision delta-sigma ADC product line, engineered specifically for bridge-based sensor applications demanding metrological accuracy, thermal stability, and integrated diagnostics in harsh industrial environments.
FAQ
What is the maximum differential input voltage supported by the ADS1235IRHBR at PGA gain = 64?
The ADS1235IRHBR supports a maximum differential input voltage of ±(AVDD – AVSS – 0.6 V) / Gain when VREF ≥ AVDD – AVSS – 0.6 V. With AVDD = 5 V and AVSS = 0 V, this yields ±(4.4 V) / 64 = ±68.75 mV. This limit ensures linear operation and avoids PGA saturation, directly impacting measurement fidelity in high-gain bridge applications.
Does the ADS1235IRHBR require an external clock source?
No - the ADS1235IRHBR includes a factory-trimmed internal oscillator operating at 7.3728 MHz ±0.5%. CLKIN can be tied to DGND to enable it; no external crystal or clock generator is needed. This reduces BOM count and layout complexity, especially in space-constrained weigh scale modules where board area is premium.
How does the ADS1235IRHBR handle reference voltage monitoring?
The ADS1235IRHBR implements a missing-reference input monitor that detects open-circuit or shorted conditions on REFP0/REFN0. When triggered, it asserts a flag in the status register and halts conversions - preventing invalid data logging in safety-critical weighing systems where reference integrity is mandatory for traceable measurements.
Can the ADS1235IRHBR simultaneously acquire data from three differential bridge sensors?
Yes - the ADS1235IRHBR's signal multiplexer supports three independent differential inputs (e.g., AIN0/AIN1, AIN2/AIN3, AIN4/AIN5), each selectable via register configuration. This enables true concurrent sampling of multiple load cells or pressure bridges without external multiplexers, preserving channel-to-channel isolation and timing coherence.
What is the purpose of the CAPP and CAPN pins on the ADS1235IRHBR?
CAPP and CAPN are differential outputs of the integrated PGA, requiring a 4.7-nF C0G capacitor across them. This forms a 2-pole anti-aliasing filter with the PGA's internal bandwidth (~60 kHz), ensuring compliance with Nyquist criteria at maximum 7200-SPS operation - eliminating need for external RC filters and associated tolerance-induced gain errors.
ADS1235IRHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.2k
- Number of Inputs:
- 6
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- Internal Oscillator, PGA, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1235IRHBR FAQ
1.How can I place an order for ADS1235IRHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1235IRHBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS1235IRHBR reliable?
The price and inventory of ADS1235IRHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1235IRHBR is usually 5 days.
3.What payment methods are accepted for ADS1235IRHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1235IRHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1235IRHBR?
ADS1235IRHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1235IRHBR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS1235IRHBR?
For technical support, including ADS1235IRHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1235IRHBR requirements.
6.How does Aetrix verify that ADS1235IRHBR is sourced from the original manufacturer or authorized distributors?
All ADS1235IRHBR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS1235IRHBR meets industry standards.
7.What is the process for return or replacement of ADS1235IRHBR?
All ADS1235IRHBR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1235IRHBR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS1235IRHBR part is unused and in its original packaging.
Return procedure for ADS1235IRHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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