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Texas Instruments ADS1222IPWR
- Part No.:
- ADS1222IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS1222IPWR.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,989
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Product details
Overview
ADS1222IPWR from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter with two differential input channels, ±5V differential input range, 0.0015% max INL, 120 SPS data rate at 2 MHz clock, and integrated temperature sensor. It operates from 2.7V to 5.5V supply and delivers 300 µA typical current in normal mode-ideal for portable medical equipment and handheld instrumentation requiring high-resolution, low-power signal acquisition.
For engineers reviewing the ADS1222IPWR datasheet, ADS1222IPWR pinout, ADS1222IPWR application, or ADS1222IPWR equivalent, this page provides verified technical context, TSSOP-14 package mapping, buffer-selectable input impedance (1.2 GΩ), self-calibration support, and real-world use value in weigh scales and industrial process control where 24-bit resolution and ±5V range are critical.
Technical Context
The ADS1222IPWR implements a delta-sigma (∆Σ) modulator with Sinc3 digital filter, delivering 24-bit no-missing-codes resolution and 0.8 ppm rms noise. Its analog front-end includes a 2-channel MUX, pin-selectable chopper-stabilized input buffer, and on-chip temperature sensor with 360 µV/°C coefficient and 106 mV output at 25°C.
It uses a simple 2-wire serial interface: DRDY/DOUT signals conversion readiness and shifts out 24-bit two's complement data on SCLK rising edges, while CLK drives internal sampling at up to 8 MHz. Settling time after MUX/BUFEN/TEMPEN toggling is 25.9–26.4 ms (fCLK = 2 MHz), and self-calibration initiates via 26th SCLK edge without external signal interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes - guarantees monotonicity and full code coverage across full-scale range |
| Data Rate | 120 SPS at 2 MHz CLK - enables precise low-frequency measurements with inherent 50/60 Hz rejection |
| Differential Input Range | ±5 V - supports direct interfacing with industrial sensors and bridge transducers without external gain |
| INL (max) | 0.0015% of FSR - ensures < ±1 LSB error over full scale at 24-bit resolution |
| Input Impedance (buffer on) | 1.2 GΩ at 2 MHz CLK - eliminates loading errors in high-Z sensor circuits like thermocouples or pH electrodes |
| Supply Range | 2.7 V to 5.5 V - allows direct operation from single Li-ion or 3.3 V/5 V system rails |
| Standby Current | < 1 µA - enables ultra-low-power duty-cycled sensing in battery-operated devices |
Pinout & Package
TSSOP-14 (PW) package with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Analog/digital power supply | Single 2.7–5.5 V rail powers entire signal chain and logic; bypassing with 0.1 µF near pin required for stability |
| SCLK | Serial clock input | Controls data shift-out timing; 5 V tolerant regardless of VDD; rising edge clocks MSB-first 24-bit output |
| CLK | System clock input | Drives internal modulator sampling (fCLK up to 8 MHz); determines data rate and noise rejection notch frequencies |
| DRDY/DOUT | Dual-function digital output | Active-low DRDY indicates valid data; transitions to DOUT after first SCLK rising edge to stream conversion result |
| MUX | Digital input | Selects between AINP1/AINN1 (MUX = 0) or AINP2/AINN2 (MUX = 1); triggers 26.4 ms digital filter settling |
| TEMPEN | Digital input | Enables on-chip diode-based temperature sensor; disconnects analog inputs and routes thermal voltage to ADC core |
| BUFEN | Digital input | Activates chopper-stabilized buffer to raise input impedance from 2.7 MΩ to 1.2 GΩ; must be disabled in Standby |
| AINP1 / AINN1 | Analog differential inputs (channel 1) | Accept ±5 V differential signal; absolute range GND+0.05 V to VDD−1.5 V when buffer enabled |
| AINP2 / AINN2 | Analog differential inputs (channel 2) | Identical electrical specs to channel 1; independent selection via MUX pin; channel matching: 20 µV offset error |
| GND | Analog/digital ground | Common reference for all analog and digital circuitry; requires low-impedance connection to minimize noise coupling |
| VREFP / VREFN | Differential reference inputs | Set full-scale range to ±2×(VREFP−VREFN); effective input impedance 500 kΩ; bypass with 0.1 µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable input buffer | Enables 1.2 GΩ input impedance (at 2 MHz CLK) to eliminate loading in high-Z sensor interfaces without external op-amps |
| On-chip temperature sensor | Provides calibrated 106 mV @ 25°C output with 360 µV/°C slope-enables system-level thermal compensation without external components |
| Self-calibration capability | Initiated via 26th SCLK edge; internally disconnects inputs and applies reference signals-no host firmware overhead or signal interruption required |
| 2-wire serial interface | Uses only DRDY/DOUT and SCLK pins; eliminates CS/SDI/SDO complexity and reduces MCU GPIO count in space-constrained designs |
| Standby mode with <1 µA draw | Activated by holding SCLK high post-DRDY; shuts down modulator, filter, and buffer-ideal for battery-powered intermittent sampling |
Applications
| Hand-Held Instrumentation | Portable Medical Equipment |
|---|---|
Use Scenario: Battery-powered multimeter measuring thermocouple outputs and resistance bridges in field service. IC Role / Device Role / Timing Role: Primary 24-bit ADC acquiring dual-channel differential sensor data with onboard temperature reference for cold-junction compensation. Use Value: ±5 V input range accepts raw thermocouple signals; 1.2 GΩ buffered input prevents measurement drift; 300 µA active current extends battery life beyond 100 hours. |
Use Scenario: Portable ECG monitor digitizing low-amplitude biopotential signals from dry electrodes. IC Role / Device Role / Timing Role: High-resolution analog front-end ADC converting differential lead-II signals with integrated temperature monitoring for baseline drift correction. Use Value: 0.0015% INL ensures diagnostic-grade linearity; 24-bit resolution resolves microvolt-level ST-segment changes; standby mode cuts idle power to sub-µW. |
| Industrial Process Control | Weigh Scales |
Use Scenario: DIN-rail mounted PLC analog input module conditioning 4–20 mA loop signals and strain gauge bridges. IC Role / Device Role / Timing Role: Precision ADC handling multiple sensor types via MUX; performs self-calibration during scheduled maintenance windows. Use Value: Dual-channel architecture supports redundant sensing; ±5 V range accommodates unamplified bridge outputs; 95 dB CMRR rejects common-mode noise in factory environments. |
Use Scenario: Platform scale electronics measuring load cell outputs under varying ambient temperatures. IC Role / Device Role / Timing Role: Primary ADC with integrated temperature sensor providing real-time thermal compensation for load cell zero and span drift. Use Value: On-die temperature measurement eliminates external sensor placement errors; 20 µV channel-to-channel offset match ensures consistent multi-cell summation. |
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, 2-kSPS, PGA (1–128 V/V), 0.0005% INL (max), SPI interface, same TSSOP-14 package | Requires external PGA configuration and SPI protocol handling; better for variable-gain sensor interfaces but adds design complexity | Choose ADS1220IPWR when programmable gain and higher speed (2 kSPS) outweigh 2-wire simplicity and lower power of ADS1222IPWR |
| MAX11202ETA+ | 24-bit, 120 SPS, ±2.5 V input range, 0.001% INL (max), SPI interface, 12-pin TDFN | Narrower input range limits direct connection to ±5 V sensors; smaller package saves board area but lacks integrated temperature sensor | Choose MAX11202ETA+ when footprint reduction is critical and ±2.5 V range aligns with signal conditioning stage; omit if temperature compensation is required |
Compared with ADS1220IPWR and MAX11202ETA+, the ADS1222IPWR uniquely combines 2-wire simplicity, ±5 V direct-input capability, and on-die temperature sensing in a cost-optimized TSSOP-14-making it optimal for fixed-gain, dual-channel, thermally compensated measurement systems where minimal MCU overhead and proven reliability are priorities.
Availability
ADS1222IPWR is available at Aetrix Electronics and suitable for handheld instrumentation, portable medical equipment, and industrial process control requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for ADS1222IPWR 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, embedded processing, and high-reliability ICs for industrial, automotive, and medical applications.
The ADS1222IPWR belongs to TI's precision delta-sigma ADC product line, designed specifically for low-power, high-resolution measurement in portable and space-constrained systems where accuracy, integration, and ease of interface are essential.
FAQ
What is the maximum clock frequency supported by the ADS1222IPWR?
The ADS1222IPWR supports a maximum CLK input frequency of 8 MHz. At this rate, the data rate increases proportionally to 480 SPS (vs. 120 SPS at 2 MHz), and noise rejection notches shift accordingly-for example, 60 Hz rejection moves to 240 Hz. Operation above 8 MHz is not characterized and may cause timing violations or degraded INL performance.
Does the ADS1222IPWR require an external voltage reference?
No-the ADS1222IPWR does not require an external voltage reference. It accepts a differential reference voltage (VREFP − VREFN) ranging from 0.5 V to VDD, and internally scales this to set the ±2×VREF full-scale input range. A stable, low-noise reference source is recommended; bypassing VREFP–VREFN with a 0.1 µF capacitor is mandatory for specified performance.
How does the input buffer affect the ADS1222IPWR's absolute input voltage range?
When the BUFEN pin is high, the ADS1222IPWR's absolute analog input range becomes GND + 0.05 V to VDD − 1.5 V-narrower than the buffer-off range (GND − 0.1 V to VDD + 0.1 V). Exceeding these limits degrades linearity and invalidates INL specifications. This constraint arises from the chopper-stabilized buffer's internal headroom requirements.
Can the ADS1222IPWR perform simultaneous sampling across both channels?
No-the ADS1222IPWR does not support true simultaneous sampling. Its single delta-sigma modulator sequentially samples the selected channel (AINP1/AINN1 or AINP2/AINN2) via the MUX pin. Channel switching incurs a 26.4 ms digital filter settling time, making it unsuitable for phase-critical dual-channel acquisition but adequate for multiplexed monitoring of slow-varying industrial sensors.
What is the purpose of the TEMPEN pin on the ADS1222IPWR?
The TEMPEN pin enables the on-chip temperature sensor by disconnecting the analog input MUX and routing internal diode junctions to the ADC core. When TEMPEN = high, the device outputs a calibrated voltage (106 mV at 25°C, 360 µV/°C slope) representing die temperature-used for thermal compensation of sensor offsets or system-level calibration without external components.
ADS1222IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 14-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1222IPWR FAQ
1.How can I place an order for ADS1222IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1222IPWR 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 ADS1222IPWR reliable?
The price and inventory of ADS1222IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1222IPWR is usually 5 days.
3.What payment methods are accepted for ADS1222IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1222IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1222IPWR?
ADS1222IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1222IPWR 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 ADS1222IPWR?
For technical support, including ADS1222IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1222IPWR requirements.
6.How does Aetrix verify that ADS1222IPWR is sourced from the original manufacturer or authorized distributors?
All ADS1222IPWR 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 ADS1222IPWR meets industry standards.
7.What is the process for return or replacement of ADS1222IPWR?
All ADS1222IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1222IPWR, 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 ADS1222IPWR part is unused and in its original packaging.
Return procedure for ADS1222IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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