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Texas Instruments ADS1244IDGSR
- Part No.:
- ADS1244IDGSR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS1244IDGSR.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,221
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Product details
Overview
ADS1244IDGSR from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter in MSOP-10 package, featuring ±5V differential input range, 15 sps data rate, single-cycle settling, simultaneous 50Hz/60Hz rejection, and <270µW typical power consumption. It serves as a precision front-end ADC for low-power, high-resolution measurement systems such as portable medical sensors and handheld instrumentation.
For engineers reviewing the ADS1244IDGSR datasheet, ADS1244IDGSR pinout, ADS1244IDGSR application, or ADS1244IDGSR equivalent, key selection considerations include its 24-bit no-missing-codes resolution, dual-supply operation (2.5–5.25V AVDD / 1.8–3.6V DVDD), self-calibration capability, Sleep Mode (<1µW), and 2-wire serial interface compatibility with MSP430 microcontrollers.
Technical Context
The ADS1244IDGSR implements a 3rd-order delta-sigma modulator followed by a digital filter that provides fixed 15 sps output, complete 50Hz/60Hz line-frequency rejection in one conversion cycle, and inherent low-pass filtering with –3dB at 13.7Hz. Its input sampling architecture uses switched-capacitor networks with effective input impedances of ~13MΩ (AINP/AINN) and 6.5MΩ (differential path) at 2.4576MHz CLK.
It supports true differential input measurement (VIN = AINP – AINN) referenced to an externally applied VREF = VREFP – VREFN, where full-scale range is ±2VREF. The device performs automatic offset/gain calibration at power-up and allows on-demand self-calibration via SCLK waveform sequencing, with fully settled output after each conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes - guarantees monotonicity and full dynamic range utilization without code gaps. |
| Data Rate | 15 samples per second - fixed output rate synchronized to 2.4576MHz system clock; enables deterministic timing for battery-powered systems. |
| Differential Input Range | ±5V - supports industrial sensor outputs (e.g., load cells, RTDs) without external signal conditioning amplifiers. |
| INL Error | ±0.0002% FSR (typ), ±0.0008% FSR (max) - ensures <1 ppm linearity error over full scale, critical for precision weighing and metrology. |
| Power Consumption | 270µW (normal), <1µW (Sleep Mode with CLK stopped) - enables multi-year operation on coin-cell batteries in portable instrumentation. |
| Supply Voltage Ranges | AVDD: 2.5–5.25V; DVDD: 1.8–3.6V - allows flexible dual-supply design or single-supply operation with internal rail separation. |
| Common-Mode Rejection | ≥100 dB at 50/60Hz - suppresses mains-borne interference in unshielded industrial environments. |
Pinout & Package
ADS1244IDGSR is housed in a 10-pin MSOP (Mini Small Outline Package) with 0.5mm pitch, thermally enhanced for stable performance in portable and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Analog and Digital Ground | Single reference node for both analog and digital sections; requires low-impedance PCB connection to minimize noise coupling. |
| VREFP (Pin 2) | Positive Reference Input | High-impedance input for external voltage reference; must be bypassed with 0.1µF capacitor to VREFN for optimal noise rejection. |
| VREFN (Pin 3) | Negative Reference Input | Completes differential reference pair; defines zero point for full-scale range ±2×(VREFP–VREFN). |
| AINN (Pin 4) | Negative Analog Input | Differential input terminal; accepts signals down to GND–0.1V and up to AVDD+0.1V; ESD-protected. |
| AINP (Pin 5) | Positive Analog Input | Differential input terminal; used with AINN to measure VIN = AINP – AINN; same voltage limits as AINN. |
| AVDD (Pin 6) | Analog Power Supply | Supplies analog modulator and reference circuitry; must be decoupled with 0.1µF ceramic capacitor near pin. |
| DVDD (Pin 7) | Digital Power Supply | Supplies digital filter and serial interface; independent rail allows logic-level optimization with MSP430 or other low-voltage MCUs. |
| DRDY/DOUT (Pin 8) | Multi-function Output | Open-drain status flag (LOW = data ready); transitions to push-pull data output (MSB-first) on first SCLK rising edge. |
| SCLK (Pin 9) | Serial Clock Input | Edge-triggered control signal; initiates data readout, Sleep Mode entry, and self-calibration when asserted after DRDY/DOUT LOW. |
| CLK (Pin 10) | System Clock Input | Drives internal modulator and filter; 2.4576MHz nominal frequency sets 15 sps and aligns 50/60Hz notches; tolerant of 5V logic regardless of DVDD. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle settling | Valid 24-bit output available immediately after DRDY/DOUT goes LOW-no pipeline delay or multiple-sample averaging required. |
| Simultaneous 50Hz and 60Hz rejection | Digital filter notch placement eliminates power-line interference without external hardware filters or software post-processing. |
| Self-calibration with no external components | On-chip offset/gain correction triggered by SCLK waveform; removes drift-induced errors without trimming resistors or calibration DACs. |
| 2-wire serial interface | Uses only DRDY/DOUT and SCLK pins-reduces MCU GPIO count and simplifies routing in dense mixed-signal layouts. |
| Sleep Mode with <1µW dissipation | Entire analog and digital circuitry shuts down while preserving state; ideal for intermittent-sampling applications like battery-powered data loggers. |
Applications
| Hand-Held Instrumentation | Portable Medical Equipment |
|---|---|
Use Scenario: Battery-powered multimeter measuring mV-level thermocouple outputs and Ω-level RTD resistance. IC Role / Device Role / Timing Role: Precision 24-bit ADC front-end with integrated reference buffering and line-frequency rejection. Use Value: Eliminates need for external instrumentation amplifier and 50/60Hz notch filter, reducing BOM count and PCB area by >30%. |
Use Scenario: Portable ECG monitor acquiring low-amplitude biopotential signals in home-care settings. IC Role / Device Role / Timing Role: Low-noise, low-power ADC with single-cycle settling and programmable Sleep Mode between heartbeats. Use Value: Enables >5-year battery life using CR2032 while maintaining <1 µVRMS input-referred noise and 130 dB CMRR at DC. |
| Industrial Process Control | Weigh Scales |
Use Scenario: Loop-powered 4–20mA transmitter digitizing pressure transducer output in hazardous-area field devices. IC Role / Device Role / Timing Role: High-accuracy ADC with ±5V input range and robust ESD protection (HBM >2kV) for harsh factory environments. Use Value: Supports direct connection to unbuffered bridge sensors, reducing total error to <0.001% FS including INL, offset drift, and supply rejection. |
Use Scenario: Platform scale using strain-gauge load cells requiring 100,000-count resolution and temperature compensation. IC Role / Device Role / Timing Role: Delta-sigma ADC with built-in self-calibration and 0.0002% INL to meet OIML R76 Class III accuracy requirements. Use Value: Achieves legal-for-trade metrology grade without factory calibration steps-calibration performed in-system during startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, low-power delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1248IPWR | 32-pin TSSOP; includes PGA (1–128×), burn-out current sources, and internal oscillator; higher integration but larger footprint and 3.3mW typical power. | Better suited for multi-sensor systems requiring programmable gain and sensor diagnostics; not drop-in compatible due to pin count and feature set. | Select ADS1248IPWR when PGA, excitation current, or internal clock simplifies system design-requires PCB redesign and firmware adaptation. |
| AD7792BRUZ | 16-bit sigma-delta ADC; 24-bit no-missing-codes not guaranteed; 1.17mW typical power; SPI interface; no Sleep Mode below 10µW. | Lower resolution and higher power limit use in ultra-low-power or Class III metrology applications; SPI requires more MCU pins than 2-wire interface. | Choose AD7792BRUZ only if 16-bit resolution suffices and existing SPI infrastructure reduces development time-verify linearity and sleep current against target specs. |
Compared with ADS1244IDGSR, ADS1248IPWR offers greater on-chip functionality at the cost of power and layout complexity, while AD7792BRUZ trades resolution and ultra-low-power capability for broader vendor support and simpler interface-but neither matches the ADS1244IDGSR's combination of 24-bit integrity, <1µW Sleep Mode, and minimal 2-wire control.
Availability
ADS1244IDGSR is available at Aetrix Electronics and suitable for handheld instrumentation, portable medical equipment, and industrial process control requiring stable component supply across long production lifecycles.
Supply support for ADS1244IDGSR 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 converters and low-power system solutions.
The ADS1244IDGSR belongs to TI's precision delta-sigma ADC product line, designed specifically for battery-operated, high-accuracy measurement applications where size, power, and linearity are critical constraints.
FAQ
What is the maximum clock frequency supported by ADS1244IDGSR?
The ADS1244IDGSR supports CLK frequencies up to 6 MHz per absolute maximum ratings. However, the recommended frequency is 2.4576 MHz to achieve 15 sps output and optimal 50/60 Hz rejection. At higher frequencies (e.g., 4.9152 MHz), data rate scales to 30 sps but line-frequency notches shift to 100/120 Hz-requiring re-evaluation of interference rejection in AC-powered environments. The ADS1244IDGSR remains functional across this range but must be characterized for noise and INL at non-nominal CLK rates.
Does ADS1244IDGSR require external calibration components?
No, the ADS1244IDGSR performs full self-calibration internally-both at power-up and on-demand-without any external resistors, capacitors, or reference sources. Offset and gain errors are corrected using on-chip circuitry triggered by specific SCLK waveforms. The ADS1244IDGSR achieves ±0.0002% INL (typ) and <10 ppm offset drift without trimming, making it suitable for maintenance-free deployments in field instruments and medical devices.
Can ADS1244IDGSR operate from a single 3.3V supply?
Yes, the ADS1244IDGSR supports single-supply operation: connect AVDD and DVDD together at 3.3V (within 2.5–3.6V overlap range). The analog and digital sections remain functionally isolated internally, and the 2-wire interface continues to operate correctly. DRDY/DOUT logic-high level will track DVDD, but CLK and SCLK inputs accept 5V-tolerant signals-enabling direct interfacing with 5V microcontrollers without level shifters. Decoupling with separate 0.1µF capacitors on AVDD and DVDD is still required.
How does ADS1244IDGSR handle input overvoltage conditions?
The ADS1244IDGSR includes ESD protection diodes on AINP, AINN, VREFP, and VREFN pins rated to ±2kV HBM. To prevent diode conduction and potential damage, input voltages must stay within GND – 0.1V to AVDD + 0.1V. Exceeding these limits forward-biases the diodes, causing current injection and measurement errors. For overvoltage-prone applications (e.g., industrial sensors), external series resistors (e.g., 10kΩ) and clamping diodes to AVDD/GND are recommended-these do not affect the ADS1244IDGSR's specified 13MΩ effective input impedance at 2.4576MHz.
Is ADS1244IDGSR pin-compatible with other members of the ADS124x family?
No, the ADS1244IDGSR is not pin-compatible with other ADS124x variants such as ADS1247 or ADS1248. While all share the MSOP-10 package option, pin functions differ significantly-for example, ADS1248 uses Pin 1 for AVSS (not GND) and Pin 8 for START (not DRDY/DOUT). The ADS1244IDGSR's 10-pin assignment is unique to its 2-wire interface and modulator architecture. Migration to other family members requires full schematic and layout revision, not just part replacement.
ADS1244IDGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.5V ~ 5.25V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1244IDGSR FAQ
1.How can I place an order for ADS1244IDGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1244IDGSR 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 ADS1244IDGSR reliable?
The price and inventory of ADS1244IDGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1244IDGSR is usually 5 days.
3.What payment methods are accepted for ADS1244IDGSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1244IDGSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1244IDGSR?
ADS1244IDGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1244IDGSR 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 ADS1244IDGSR?
For technical support, including ADS1244IDGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1244IDGSR requirements.
6.How does Aetrix verify that ADS1244IDGSR is sourced from the original manufacturer or authorized distributors?
All ADS1244IDGSR 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 ADS1244IDGSR meets industry standards.
7.What is the process for return or replacement of ADS1244IDGSR?
All ADS1244IDGSR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1244IDGSR, 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 ADS1244IDGSR part is unused and in its original packaging.
Return procedure for ADS1244IDGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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