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Texas Instruments ADS1234IPW
- Part No.:
- ADS1234IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS1234IPW.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:352
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Product details
Overview
ADS1234IPW from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter optimized for bridge sensor front-ends, featuring four differential input channels, selectable PGA gains of 1/2/64/128, and 100 dB simultaneous 50 Hz/60 Hz rejection - deployed in high-accuracy weigh scales and industrial pressure sensing systems.
For engineers reviewing the ADS1234IPW datasheet, ADS1234IPW pinout, ADS1234IPW application, or ADS1234IPW equivalent, this page delivers verified specifications, TSSOP-28 package mapping, real-world use-value context for ratiometric bridge measurements, and validated alternative options for sensor signal chain design.
Technical Context
The ADS1234IPW integrates a third-order delta-sigma modulator with a fourth-order digital filter, delivering up to 23.5-bit effective resolution at 10 SPS and 19.2-bit noise-free resolution at gain = 64. Its low-noise PGA supports full-scale differential inputs from ±2.5 V (gain = 1) down to ±19.5 mV (gain = 128), with input-referred RMS noise as low as 17 nV at 10 SPS/gain = 128.
It operates via pin-driven control-no register programming required-and uses a two-wire serial interface (DRDY/DOUT + SCLK) compatible with MSP430 and similar microcontrollers. Clocking is flexible: internal oscillator (low-drift), external crystal (XTAL1/XTAL2), or external clock (CLKIN), enabling precise timing control in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes ADC with 23.5-bit effective resolution at 10SPS/gain=1 - ensures sub-10ppm measurement fidelity for precision load cells. |
| Data Rates | Selectable 10SPS (for 50/60Hz rejection) or 80SPS (higher throughput) - enables trade-off between noise immunity and update speed in real-time weighing. |
| PGA Gains | 1, 2, 64, 128 - maps ±2.5V to ±19.5mV full-scale ranges, supporting both high-output strain gauges and ultra-low-output microbridge sensors. |
| Noise Performance | 17nV RMS at 10SPS/gain=128 - enables <1µV input signal detection without external amplification in millivolt-level bridge outputs. |
| Supply Range | 2.7V to 5.3V for both AVDD and DVDD - allows single-supply operation from 3.3V or 5V rails, simplifying power architecture in embedded scale modules. |
| Operating Temp | –40°C to +105°C - qualified for industrial PLC weight modules and outdoor weighing terminals exposed to wide ambient swings. |
| Reference Input | External ratiometric reference up to 5V - eliminates ratio errors when using same supply for bridge excitation and ADC reference. |
Pinout & Package
TSSOP-28 package (9.7 mm × 6.4 mm), lead pitch 0.65 mm, thermally enhanced for stable performance in continuous-conversion industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP1–AINP4 / AINN1–AINN4 | Differential analog inputs | Four independent differential channel pairs accept bridge sensor outputs; MUX selection controlled by A0/A1 pins per Table 7-2. |
| GAIN1/GAIN0 | Digital input | Hardwired gain configuration (00=1, 01=2, 10=64, 11=128); sets PGA gain without firmware overhead. |
| SPEED | Digital input | Selects data rate: low = 10SPS (high-rejection mode), high = 80SPS (fast-update mode). |
| DRDY/DOUT | Dual-function digital output | Active-low DRDY signals valid conversion; same pin shifts out MSB-first 24-bit data on SCLK rising edges. |
| CLKIN/XTAL1 & XTAL2 | Clock input pair | Supports external 4.9152 MHz crystal or oscillator; tie CLKIN low to enable internal oscillator - no external timing components needed. |
| PDWN | Digital input | Power-down/reset control: hold low to enter <1 µA shutdown; toggle at power-up to initialize internal state. |
| REFP/REFN | Analog reference inputs | Accept external ratiometric reference (up to 5V); REFP–REFN defines full-scale range - critical for bridge excitation matching. |
| CAP | Analog bypass terminal | Two dedicated pins (9 & 10) require 0.1 µF capacitor across them to stabilize PGA bias - mandatory for low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Complete bridge sensor front-end | Integrates 4-channel MUX, low-drift PGA, ΔΣ ADC, and digital filter - eliminates discrete op-amps, filters, and calibration logic in weigh-scale designs. |
| Pin-driven configuration | No registers or SPI/I²C setup required; all modes (gain, speed, channel select) set by hardwired digital inputs - reduces firmware complexity and boot-time latency. |
| Simultaneous 50/60 Hz rejection | 100 dB rejection at 10SPS without external notch filters - meets EN 61000-4-8 immunity requirements for industrial weighing equipment. |
| Ratiometric measurement support | External reference input (up to 5V) enables true ratiometric operation where bridge excitation and ADC reference share same supply - cancels supply drift errors. |
| Low-power standby mode | Consumes only 0.1–1 µA in standby (SCLK high), enabling battery-powered portable scales with multi-week runtime between charges. |
Applications
| Weigh Scales | PLC Weight Modules |
|---|---|
Use Scenario: High-precision platform scales used in logistics and pharmaceutical dispensing requiring ±0.005% full-scale accuracy under vibration and EMI. IC Role / Device Role / Timing Role: Primary ADC capturing millivolt-level outputs from 4-wire load cells; performs on-demand offset calibration before each weighing cycle. Use Value: 17nV RMS noise at gain=128 enables direct digitization of 2mV/V bridge outputs without pre-amplification, reducing component count and thermal drift sources. |
Use Scenario: DIN-rail mounted industrial weight acquisition modules interfacing with Modbus RTU PLCs in batching systems. IC Role / Device Role / Timing Role: Sensor interface IC converting analog weight signals into calibrated 24-bit digital values synchronized to PLC scan cycles via SPEED pin control. Use Value: Pin-compatible 10SPS/80SPS selection allows same hardware to serve both high-accuracy batch verification (10SPS) and dynamic conveyor weighing (80SPS). |
| Pressure Sensors | Strain Gauge Instrumentation |
Use Scenario: Hermetically sealed differential pressure transducers for HVAC and medical gas monitoring, operating over –25°C to +85°C. IC Role / Device Role / Timing Role: Signal conditioner digitizing Wheatstone bridge outputs from silicon piezoresistive elements; uses internal oscillator for timing stability across temperature. Use Value: 100 dB 50/60 Hz rejection eliminates need for external line-frequency filtering in building automation panels with shared AC power buses. |
Use Scenario: Portable structural health monitoring units measuring microstrain on bridges and pipelines using bonded foil strain gauges. IC Role / Device Role / Timing Role: Low-power ADC sampling at 10SPS with automatic offset calibration triggered by SCLK edge - ideal for battery-operated field instruments. Use Value: Four differential inputs allow simultaneous monitoring of multiple gauge rosettes, while 2.7V–5.3V supply range supports direct connection to Li-ion or USB-powered supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge-sensor ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1232IPW | 2-channel differential input, integrated temperature sensor (TEMP pin), TSSOP-24 package - lacks A1 pin and third/fourth input pairs. | Targeted at dual-load-cell or temperature-compensated single-sensor systems; not suitable for 4-sensor arrays or multiplexed multi-point sensing. | Select ADS1232IPW when temperature monitoring is required and channel count ≤2; ADS1234IPW is mandatory for 4 independent bridge inputs. |
| AD7793BRUZ | 24-bit ΣΔ ADC with 3-channel differential inputs, programmable gain (1–128), but requires SPI register configuration and external reference - no pin-driven simplicity. | Used in lab-grade instrumentation where software configurability outweighs deterministic pin-control; lacks built-in 50/60 Hz rejection tuning. | Choose AD7793BRUZ if SPI-based calibration flexibility and lower cost are priorities; ADS1234IPW offers faster time-to-measurement and guaranteed line-frequency rejection. |
Compared with ADS1232IPW, the ADS1234IPW adds two extra differential channels and removes the temperature sensor - making it optimal for multi-sensor industrial weighing where channel density matters more than on-chip thermal compensation. Against AD7793BRUZ, it trades register programming for deterministic pin control and factory-tuned 100 dB 50/60 Hz rejection - reducing firmware validation burden in safety-critical scale certification.
Availability
ADS1234IPW is available at Aetrix Electronics and suitable for weigh scales, PLC weight modules, and pressure sensors requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing for ISO 9001-certified production.
Supply support for ADS1234IPW 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 ADS123x family was designed specifically for high-accuracy bridge sensor measurement in industrial weighing, pressure, and force applications - integrating PGA, ΔΣ conversion, and digital filtering into a pin-configurable, low-maintenance solution.
FAQ
What is the maximum achievable effective resolution of the ADS1234IPW?
The ADS1234IPW achieves up to 23.5 bits effective resolution at 10 SPS with PGA gain = 1, measured with AVDD = DVDD = VREF = 5 V. This value is derived from input-referred RMS noise of 420 nV and full-scale range of 5 V, per Equation 1 in Section 6.1 of the datasheet. At higher gains or data rates, effective resolution decreases predictably - e.g., 21.1 bits at gain = 128/10 SPS.
Does the ADS1234IPW support external crystal oscillators?
Yes, the ADS1234IPW supports external crystal oscillators via CLKIN/XTAL1 and XTAL2 pins. A 4.9152 MHz crystal is recommended for optimal 10 SPS or 80 SPS timing accuracy. When an external crystal is used, NMRR improves to 120–130 dB at 50/60 Hz versus 100 dB with the internal oscillator - critical for EMI-heavy factory floor deployments.
How many differential input channels does the ADS1234IPW provide?
The ADS1234IPW provides four fully differential input channels (AINP1/AINN1 through AINP4/AINN4), selected via A0 and A1 digital inputs per Table 7-2. Unlike the ADS1232IPW, it does not include an integrated temperature sensor - all four channels are dedicated to analog signal acquisition, enabling true 4-sensor multiplexed weighing systems.
Can the ADS1234IPW operate from a single 3.3V supply?
Yes, the ADS1234IPW operates across AVDD and DVDD from 2.7 V to 5.3 V, including standard 3.3 V rails. At 3.3 V, typical analog supply current is 1.35 mA (gain = 64/128, normal mode), and digital supply current is 75–120 µA - enabling direct integration into 3.3 V microcontroller-based scale controllers without level-shifting.
What is the purpose of the CAP pins on the ADS1234IPW?
The two CAP pins (9 and 10) on the ADS1234IPW must be connected with a 0.1 µF ceramic capacitor to stabilize the internal PGA bias network. Omitting this capacitor causes increased noise, gain nonlinearity, and potential instability - especially at high gains (64/128). This is a mandatory layout requirement, not optional decoupling.
ADS1234IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 80
- Number of Inputs:
- 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.3V
- Voltage - Supply, Digital:
- 2.7V ~ 5.3V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 28-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1234IPW FAQ
1.How can I place an order for ADS1234IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1234IPW 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 ADS1234IPW reliable?
The price and inventory of ADS1234IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1234IPW is usually 5 days.
3.What payment methods are accepted for ADS1234IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1234IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1234IPW?
ADS1234IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1234IPW 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 ADS1234IPW?
For technical support, including ADS1234IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1234IPW requirements.
6.How does Aetrix verify that ADS1234IPW is sourced from the original manufacturer or authorized distributors?
All ADS1234IPW 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 ADS1234IPW meets industry standards.
7.What is the process for return or replacement of ADS1234IPW?
All ADS1234IPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS1234IPW, 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 ADS1234IPW part is unused and in its original packaging.
Return procedure for ADS1234IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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