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Texas Instruments ADS1224IPWTG4
- Part No.:
- ADS1224IPWTG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS1224IPWTG4.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,470
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Product details
Overview
ADS1224IPWTG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter with four differential input channels, ±5V differential input range, 0.0015% max INL, 120 SPS data rate at 2MHz clock, and integrated temperature sensor. It operates from 2.7V to 5.5V analog/digital supplies and draws only 285µA (AVDD = 5V, buffer off), targeting high-precision portable instrumentation.
For engineers reviewing the ADS1224IPWTG4 datasheet, ADS1224IPWTG4 pinout, ADS1224IPWTG4 application, or ADS1224IPWTG4 equivalent, this page delivers verified technical context, TSSOP-20 package mapping, real-world use scenarios in weigh scales and medical devices, and two validated alternative parts with documented functional trade-offs.
Technical Context
The ADS1224IPWTG4 implements a Sinc3 digital filter following a delta-sigma modulator, delivering 24-bit no-missing-codes resolution and 20-bit effective resolution. Its input multiplexer selects among four differential channels (AINP1/AINN1 through AINP4/AINN4) via MUX0/MUX1 control pins, while BUFEN enables a chopper-stabilized buffer for 1.2GΩ input impedance at 2MHz clock.
It uses a 2-wire serial interface: DRDY/DOUT signals conversion completion (active-low) and shifts out 24-bit two's complement data on SCLK rising edges; CLK accepts up to 8MHz external timing. Self-calibration is triggered by SCLK pulses after data read, and standby mode reduces current to <1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes; guarantees monotonic output across full scale |
| Data Rate | 120 SPS at 2MHz CLK; scales linearly to 240 SPS at 4MHz CLK |
| Differential Input Range | ±5V; supports direct measurement of industrial sensor outputs without signal conditioning |
| INL (max) | 0.0015% of FSR; ensures ≤1.5ppm linearity error over full-scale range |
| Input Impedance (buffer on) | 1.2GΩ at 2MHz CLK; eliminates loading errors from high-Z sources like thermocouples |
| Supply Voltage Range | 2.7V–5.5V for both AVDD and DVDD; enables single-supply battery-powered operation |
| Temperature Sensor | On-chip diode-based sensor with 106mV @ 25°C and 360µV/°C coefficient |
Pinout & Package
TSSOP-20 (PW) package: 6.5mm × 4.4mm, 0.65mm pitch, thermally enhanced with exposed pad (not electrically connected). Pin 17 (GND) serves as common analog/digital reference; AVDD (pin 20) and DVDD (pin 1) are separate supply rails.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP1–AINP4 / AINN1–AINN4 | Differential analog inputs | Four independent differential channel pairs; support unipolar measurement when AINNx tied to GND |
| MUX0, MUX1 | Digital address inputs | Select one of four differential channels per Table 1; no external decoder required |
| BUFEN | Buffer enable control | High = activates chopper-stabilized buffer; low = direct capacitor sampling (6MΩ input Z) |
| TEMPEN | Temperature sensor enable | High = disconnects analog inputs and routes on-chip diode pair to modulator |
| DRDY/DOUT | Open-drain status/data output | Active-low DRDY indicates valid data; transitions to push-pull DOUT on first SCLK rising edge |
| SCLK, CLK | Serial clock / system clock inputs | SCLK clocks data shift-out; CLK drives modulator (8MHz max); both accept 5V logic regardless of DVDD |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating architecture | Eliminates need for external calibration components; power-up calibration ensures initial accuracy |
| Pin-selectable input buffer | Single BUFEN pin toggles between 1.2GΩ buffered and 6MΩ unbuffered input impedance |
| Integrated temperature sensor | Monitors die temperature with ±1.5°C accuracy (typ) using factory-trimmed diode pair |
| Standby mode | Reduces total current to <1µA; enables rapid wake-up for intermittent measurement systems |
| 2-wire serial interface | Minimizes MCU GPIO usage; DRDY/DOUT dual function reduces pin count vs. separate RDY and DATA lines |
Applications
| Hand-Held Instrumentation | Portable Medical Equipment |
|---|---|
Use Scenario: Battery-powered multimeter measuring mV-level thermocouple outputs and V-level pressure transducer signals. IC Role / Device Role / Timing Role: Primary ADC acquiring synchronized differential readings across four sensor inputs with onboard temperature compensation. Use Value: 24-bit resolution and 0.0015% INL ensure traceable metrology-grade accuracy; 285µA active current extends battery life beyond 100 hours. |
Use Scenario: Wearable ECG monitor digitizing low-amplitude biopotential signals from dry electrodes. IC Role / Device Role / Timing Role: High-Z input ADC rejecting electrode half-cell potential drift via chopper-stabilized buffer and precise common-mode rejection. Use Value: 1.2GΩ buffered input impedance prevents signal attenuation; 90–110dB CMRR suppresses 50/60Hz interference without external filters. |
| Industrial Process Control | Weigh Scales |
Use Scenario: PLC analog input module converting 4–20mA loop signals and RTD bridge outputs in harsh factory environments. IC Role / Device Role / Timing Role: Isolated front-end ADC providing galvanically separated, calibrated measurements with integrated reference monitoring. Use Value: ±5V differential input range accommodates wide signal swings; self-calibration maintains accuracy across −40°C to +85°C operating range. |
Use Scenario: Platform scale electronics measuring microvolt-level strain gauge bridge outputs under varying load and temperature conditions. IC Role / Device Role / Timing Role: Precision sigma-delta converter performing ratiometric measurements against internal reference while compensating for thermal drift. Use Value: On-chip temperature sensor enables real-time gain/offset correction; 20-bit effective resolution resolves sub-gram weight changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1220IPWR | 24-bit, 2kSPS, built-in PGA (1–128×), no internal temp sensor, same TSSOP-20 package | Better suited for low-level sensor signals requiring programmable gain; lacks integrated temperature sensing | Select when amplifying µV-level signals (e.g., load cells) without external op-amps; not drop-in due to different register map and PGA control |
| AD7792BRUZ | 24-bit, 480SPS, 3-channel diff, 1.17mW typical power, SPI interface, no BUFEN pin | Higher speed and lower noise, but requires external buffer for >10MΩ input Z and lacks pin-selectable buffer | Choose for lower-noise, higher-throughput systems where SPI compatibility and lower THD are critical; layout differs due to SPI vs. 2-wire interface |
Compared with ADS1224IPWTG4, ADS1220IPWR adds programmable gain at higher speed but removes temperature sensing, while AD7792BRUZ offers superior noise performance and SPI compatibility at the cost of higher power and no pin-controlled buffer-both require firmware and layout revisions.
Availability
ADS1224IPWTG4 is available at Aetrix Electronics and suitable for hand-held instrumentation, portable medical equipment, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS1224IPWTG4 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 low-power design.
The ADS1224IPWTG4 belongs to TI's precision delta-sigma ADC product line, engineered specifically for battery-operated, space-constrained measurement systems demanding 24-bit integrity and ultra-low quiescent current.
FAQ
What is the maximum clock frequency supported by ADS1224IPWTG4?
The ADS1224IPWTG4 supports a maximum CLK input frequency of 8MHz, enabling scalable data rates up to 480SPS. At 8MHz, the device achieves 480 samples per second with proportional settling time increase; however, typical operation uses 2MHz or 4MHz for optimal noise-performance trade-off. The ADS1224IPWTG4 datasheet specifies timing parameters scaled directly to CLK period, ensuring predictable behavior across the full range.
Does ADS1224IPWTG4 include an internal voltage reference?
No, the ADS1224IPWTG4 does not include an internal voltage reference. It requires an external differential reference applied between VREFP and VREFN pins, with a valid range of 0.5V to AVDD. The modulator uses VREF = VREFP − VREFN to define full-scale range (±2VREF), and reference input impedance is 500kΩ at 2MHz CLK. For best performance, TI recommends bypassing VREFP–VREFN with a 0.1µF capacitor placed close to the pins.
How does the BUFEN pin affect input impedance and linearity on ADS1224IPWTG4?
When BUFEN is high, the ADS1224IPWTG4 enables a chopper-stabilized buffer, raising differential input impedance to 1.2GΩ at 2MHz CLK and reducing offset drift to 0.2µV/°C. When BUFEN is low, input impedance drops to 6MΩ and INL degrades slightly (0.0015% max vs. 0.0006% max buffered). The buffer also restricts absolute input voltage range to GND + 0.05V to AVDD − 1.5V, versus GND − 0.1V to AVDD + 0.1V in unbuffered mode.
Can ADS1224IPWTG4 perform simultaneous sampling across its four differential channels?
No, the ADS1224IPWTG4 does not support true simultaneous sampling. It uses a single delta-sigma modulator with a 4-channel analog multiplexer; channels are sampled sequentially under software or hardware control via MUX0/MUX1. However, multiple ADS1224IPWTG4 devices can be synchronized using shared CLK and coordinated MUX control to build a pseudo-synchronous multichannel system with matched timing alignment.
What is the purpose of the TEMPEN pin on ADS1224IPWTG4?
The TEMPEN pin on ADS1224IPWTG4 enables on-chip temperature sensing by disconnecting all analog input channels and routing an internal 1x/64x diode pair to the modulator. When TEMPEN = high, the device outputs a voltage proportional to die temperature (106mV at 25°C, 360µV/°C coefficient), allowing real-time thermal compensation of gain/offset errors. This function operates independently of MUX0/MUX1 state and requires no external components.
ADS1224IPWTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 240
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1224IPWTG4 FAQ
1.How can I place an order for ADS1224IPWTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1224IPWTG4 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 ADS1224IPWTG4 reliable?
The price and inventory of ADS1224IPWTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1224IPWTG4 is usually 5 days.
3.What payment methods are accepted for ADS1224IPWTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1224IPWTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1224IPWTG4?
ADS1224IPWTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1224IPWTG4 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 ADS1224IPWTG4?
For technical support, including ADS1224IPWTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1224IPWTG4 requirements.
6.How does Aetrix verify that ADS1224IPWTG4 is sourced from the original manufacturer or authorized distributors?
All ADS1224IPWTG4 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 ADS1224IPWTG4 meets industry standards.
7.What is the process for return or replacement of ADS1224IPWTG4?
All ADS1224IPWTG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1224IPWTG4, 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 ADS1224IPWTG4 part is unused and in its original packaging.
Return procedure for ADS1224IPWTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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