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Texas Instruments ADS1243SJD
- Part No.:
- ADS1243SJD
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-CDIP (0.300", 7.62mm) Window
- Datasheet:
-
ADS1243SJD.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 20CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,914
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Product details
Overview
ADS1243SJD from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with integrated PGA (gains 1–128), on-chip offset DAC, burnout current sources, and SPI-compatible serial interface. It operates from –55°C to 210°C, delivers 24-bit no-missing-codes resolution, supports simultaneous 50/60-Hz rejection, and is designed for high-precision sensor signal conditioning in down-hole drilling and extreme-temperature industrial systems.
For engineers reviewing the ADS1243SJD datasheet, ADS1243SJD pinout, ADS1243SJD application, or ADS1243SJD equivalent, key selection criteria include its extended temperature rating (–55°C to 210°C), differential 8-channel multiplexed input architecture, programmable FIR filter with single-cycle settling, ratiometric reference support, and CMOS-compatible digital I/O timing at up to 5 MHz master clock.
Technical Context
The ADS1243SJD employs a second-order delta-sigma modulator with programmable output data rates (3.75 Hz to 30 Hz) and an integrated FIR digital filter enabling simultaneous 50-Hz and 60-Hz notch rejection (≥90 dB). Its input stage includes a chopper-stabilized FET buffer (5 GΩ input impedance when enabled) and a user-configurable PGA with eight discrete gain settings.
Calibration is supported via self-calibration (SELFCAL/SELFOCAL/SELFGCAL) and system calibration (SYSOCAL/SYSGCAL), both requiring two tDATA periods. The device uses an external differential voltage reference (0.1 V to 5 V range) and features eight bidirectional data I/O pins usable as general-purpose digital inputs or outputs under register control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes - guarantees monotonicity and full dynamic range without code gaps. |
| INL | ±0.0015% FS - enables high-accuracy measurement of low-level transducer signals without post-processing correction. |
| PGA Gain Range | 1 to 128 - allows optimization of effective resolution from 1 µV (gain=1, 5-V FS) to 75 nV (gain=128, 39-mV FS). |
| Simultaneous 50/60-Hz Rejection | ≥90 dB minimum - eliminates power-line interference in noisy industrial environments without external filtering. |
| Operating Temperature | –55°C to 210°C - qualified for 1000 hours continuous operation at max rated junction temperature (215°C). |
| Power Dissipation | 600 µW typical at 5 V - enables low-power operation in battery-backed or thermally constrained high-temp systems. |
| Input Channels | 8 multiplexed differential inputs (AIN0–AIN7) - supports up to four independent differential or eight single-ended sensor connections. |
| Digital Interface | SPI-compatible with CS, SCLK, DIN, DOUT, DRDY - enables direct connection to microcontrollers without protocol translation. |
Pinout & Package
The ADS1243SJD is supplied in a ceramic dual-in-line package (CDIP) with 20 leads, rated for extreme temperature operation and hermetically sealed for reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 2.7 V to 5.25 V analog/digital supply; decoupling required near pin for noise-sensitive delta-sigma operation. |
| XIN / XOUT | Crystal oscillator interface | Supports external crystal or ceramic resonator (2.4576 MHz or 4.9152 MHz); internal oscillator not present. |
| PDWN | Active-low power-down control | Shuts down analog and digital circuits; draws only 60–80 µA in sleep mode. |
| VREF+ / VREF– | Differential reference inputs | Accept 0.1 V to 5 V differential reference; enable ratiometric measurements with bridge sensors or RTDs. |
| AIN0–AIN7 | Configurable analog inputs / digital I/O | Eight pins serve as either analog inputs (differential pairs) or bidirectional GPIO; configured via registers. |
| DRDY | Data-ready indicator | Active-low open-drain output signals valid conversion data; used to synchronize host read operations. |
| CS / SCLK / DIN / DOUT | SPI interface signals | Standard 4-wire SPI with Schmitt-trigger inputs; supports up to 5 MHz clock for fast register access and data reads. |
| GND | Analog/digital ground | Single ground plane required; pin 15 serves as common return for all analog and digital currents. |
Key Features
| Feature | Design Value |
|---|---|
| Burnout current sources (2 µA) | Enables open/short detection on remote sensors without external circuitry - critical for down-hole transducer health monitoring. |
| On-chip 8-bit offset DAC | Provides ±VREF/(2×PGA) or ±VREF/(4×PGA) offset adjustment - eliminates external op-amp nulling networks in precision weigh-scale designs. |
| Single-cycle settling digital filter | Delivers first valid conversion immediately after MUX change - eliminates dead time in multi-channel scanning systems. |
| Programmable data output rates | 3.75 Hz, 7.5 Hz, 15 Hz, or 30 Hz - allows trade-off between noise performance and throughput without changing hardware. |
| Chopper-stabilized input buffer | Raises input impedance from 5 MΩ/PGA to 5 GΩ - prevents loading errors on high-impedance pH or piezoelectric sensors. |
Applications
| Down-Hole Drilling Sensors | High-Temperature Industrial Control |
|---|---|
Use Scenario: Real-time pressure and temperature monitoring inside oil/gas wellbores at >150°C ambient. IC Role / Device Role / Timing Role: Primary ADC digitizing strain-gauge and RTD outputs; performs ratiometric conversion using external reference. Use Value: 210°C operating rating and 1000-hour qualification eliminate need for external cooling or derating; simultaneous 50/60-Hz rejection suppresses EMI from drilling motors. | Use Scenario: Closed-loop feedback in furnace controllers exposed to sustained 200°C cabinet temperatures. IC Role / Device Role / Timing Role: High-resolution acquisition of thermocouple and load-cell signals; interfaces directly to isolated MCU via SPI. Use Value: On-chip PGA (up to 128×) resolves microvolt-level thermocouple EMF; burnout detection flags failed sensors before thermal runaway occurs. |
| Vibration/Modal Analysis Systems | Multi-Channel Smart Transmitters |
Use Scenario: Portable structural health monitoring units measuring dynamic strain on bridges or aircraft components. IC Role / Device Role / Timing Role: Simultaneous sampling of 4 differential channels (e.g., AIN0–AIN1, AIN2–AIN3) with synchronized DRDY-driven reads. Use Value: Single-cycle settling filter enables rapid channel switching without settling delay; 24-bit resolution captures sub-microstrain events in FFT-based analysis. | Use Scenario: HART-enabled 4–20 mA transmitters for pressure, flow, and level sensing in process plants. IC Role / Device Role / Timing Role: Precision front-end ADC with integrated offset DAC and calibration commands - reduces component count and BOM cost. Use Value: Self-calibration (SELFCAL) and system calibration (SYSOCAL/SYSGCAL) ensure long-term accuracy drift <0.04 ppm/°C offset and <1.118 ppm/°C gain error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-temperature precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258-SEP | 24-bit, radiation-hardened, 125-kSPS SAR ADC; no on-chip PGA or burnout sources; requires external reference and driver. | Targeted at space-grade systems with single-event latchup immunity; lacks integrated sensor diagnostics and extreme-temperature qualification. | Select only for radiation-tolerant aerospace use where speed >30 Hz is required and external signal conditioning is acceptable. |
| AD7195BRUZ | 24-bit, 4.8-kSPS delta-sigma ADC; PGA (1–128), 50/60-Hz rejection, but rated only to 105°C; includes internal reference and excitation current sources. | Optimized for laboratory instrumentation and medical devices; lacks extended temperature qualification and burnout current sources. | Choose for commercial/industrial applications below 125°C where internal reference simplifies design and lower power is acceptable. |
Compared with ADS1243SJD, ADS1258-SEP offers higher speed but no integrated sensor health monitoring or extreme-temperature operation, while AD7195BRUZ provides easier system integration at standard temperatures but cannot replace ADS1243SJD in down-hole or furnace-control deployments requiring 210°C operation.
Availability
ADS1243SJD is available at Aetrix Electronics and suitable for down-hole drilling, high-temperature industrial control, and vibration analysis applications requiring stable component supply across extended product lifecycles and extreme environmental conditions.
Supply support for ADS1243SJD 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 aerospace markets.
The ADS1243SJD belongs to TI's high-temperature precision ADC product line, engineered specifically for sensor signal acquisition in environments exceeding 150°C - including oilfield, aerospace, and advanced manufacturing systems.
FAQ
What is the maximum operating temperature of the ADS1243SJD?
The ADS1243SJD is fully characterized and qualified for continuous operation from –55°C to +210°C ambient temperature, with a maximum junction temperature of 215°C. It undergoes 1000 hours of life testing at maximum rated temperature per TI's high-temperature product qualification standard, making it suitable for down-hole drilling and furnace monitoring where conventional ADCs fail.
Does the ADS1243SJD include an internal voltage reference?
No, the ADS1243SJD requires an external differential voltage reference applied to VREF+ and VREF– pins. The reference voltage must be between 0.1 V and 5 V, and the device supports ratiometric operation - meaning reference drift directly affects measurement accuracy, so a stable external reference such as REF5025 or ADR4550 is recommended for ADS1243SJD designs.
How does the burnout current source function in the ADS1243SJD?
The ADS1243SJD integrates two 2-µA burnout current sources - one connected to AIN+ and one to AIN– - activated via the BOCS bit in the SETUP register. When enabled, an open sensor pulls AIN+ to VDD and AIN– to GND, producing full-scale output (0x7FFFFF); a shorted sensor yields near-zero output. This enables automatic fault detection in remote sensor arrays without additional discrete components.
Can the ADS1243SJD operate with a 3-V supply?
Yes, the ADS1243SJD supports a supply range of 2.7 V to 5.25 V. At 3 V, specifications include 24-bit no-missing-codes resolution, ±0.0025% INL, and 600-µW typical power consumption. Input ranges adjust accordingly: with VREF = 1.25 V and buffer enabled, the analog input range is GND + 0.05 V to VDD – 1.5 V (i.e., 0.05 V to 1.5 V), preserving usability in low-voltage, high-temp battery-powered systems.
What calibration modes does the ADS1243SJD support?
The ADS1243SJD supports self-calibration (SELFCAL, SELFOCAL, SELFGCAL) and system calibration (SYSOCAL, SYSGCAL). SELFCAL corrects both offset and gain errors in two tDATA cycles; SYSOCAL requires a zero-differential input and SYSGCAL requires a full-scale input. Calibration must be performed after power-up, temperature shifts, or PGA changes, and the ODAC must be disabled during calibration to avoid corruption of correction coefficients.
ADS1243SJD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-CDIP (0.300", 7.62mm) Window
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 8
- 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 ~ 3.3V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -55°C ~ 210°C
- Supplier Device Package:
- 20-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS1243SJD FAQ
1.How can I place an order for ADS1243SJD through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1243SJD 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 ADS1243SJD reliable?
The price and inventory of ADS1243SJD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1243SJD is usually 5 days.
3.What payment methods are accepted for ADS1243SJD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1243SJD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1243SJD?
ADS1243SJD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1243SJD 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 ADS1243SJD?
For technical support, including ADS1243SJD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1243SJD requirements.
6.How does Aetrix verify that ADS1243SJD is sourced from the original manufacturer or authorized distributors?
All ADS1243SJD 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 ADS1243SJD meets industry standards.
7.What is the process for return or replacement of ADS1243SJD?
All ADS1243SJD units undergo pre-shipment inspection (PSI). If there is an issue with ADS1243SJD, 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 ADS1243SJD part is unused and in its original packaging.
Return procedure for ADS1243SJD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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