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Texas Instruments ADS1256IDBRG4
- Part No.:
- ADS1256IDBRG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS1256IDBRG4.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,521
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Product details
Overview
ADS1256IDBRG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter with four differential or eight single-ended inputs, 23-bit noise-free resolution at 2.5 SPS, ±0.0010% nonlinearity (max), and SPI-compatible serial interface. It integrates chopper-stabilized input buffer, programmable gain amplifier (1–64), sensor integrity detection, and self/system calibration - deployed in high-precision weigh scales and medical instrumentation.
For engineers reviewing the ADS1256IDBRG4 datasheet, ADS1256IDBRG4 pinout, ADS1256IDBRG4 application, or ADS1256IDBRG4 equivalent, this page delivers verified technical context, package mapping to SSOP-28, real-world noise performance across data rates and PGA settings, and validated alternative options for precision measurement system design.
Technical Context
The ADS1256IDBRG4 implements a 4th-order delta-sigma modulator followed by a programmable digital filter, enabling tradeoffs between resolution (up to 23 bits noise-free) and data rate (2.5–30 kSPS). Its flexible input multiplexer supports open/short sensor detection via selectable 0.5/2/10 µA current sources, and automatically enables the input buffer during detection.
It features a low-noise PGA (27 nV input-referred noise), 5 V-tolerant digital I/Os (including D0/CLKOUT, D1–D3), and dual-supply operation: AVDD = 5 V, DVDD = 1.8–3.6 V. Calibration supports offset/gain correction across all PGA settings, and the SPI interface operates in 2-wire mode with DRDY-driven timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-codes output with up to 23-bit noise-free resolution at 2.5 SPS - ensures full code coverage and metrology-grade stability. |
| Data Rate | Programmable from 2.5 to 30,000 SPS - allows dynamic optimization of speed vs. noise floor in multi-channel systems. |
| INL | ±0.0010% FSR max (PGA = 1) - guarantees sub-1 ppm linearity error critical for calibration-sensitive instrumentation. |
| Input Configuration | Four differential or eight single-ended analog inputs - supports scalable sensor arrays without external mux hardware. |
| Power Dissipation | 38 mW normal mode (PGA = 1, buffer off), 0.4 mW standby - enables low-power portable and battery-operated precision devices. |
| Reference Input Range | VREFP–VREFN = 0.5–2.6 V - accommodates internal or external references including 2.5 V bandgap and 4.096 V precision sources. |
| Operating Temp | −40°C to +105°C - qualified for industrial and medical environments with extended thermal margins. |
Pinout & Package
ADS1256IDBRG4 is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, moisture sensitivity level 3, and Pb-free / RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Analog input channels | Support configurable differential pairs (e.g., AIN0/AIN1) or single-ended measurements referenced to AINCOM - enables flexible sensor interfacing. |
| AINCOM | Analog input common | Reference node for single-ended inputs; may be tied to mid-supply or external reference - eliminates ground-loop dependency. |
| VREFP / VREFN | Differential reference inputs | Accept 0.5–2.6 V reference span; internal scaling yields ±2×VREF full-scale range - simplifies ratiometric or absolute measurement designs. |
| SYNC/PDWN | Active-low synchronization/power-down | Initiates synchronized conversions across multiple ADCs or enters ultra-low-power state (<2 µA) - essential for time-aligned sensor networks. |
| DRDY | Active-low data ready output | Indicates valid conversion result available on DOUT - enables interrupt-driven firmware with deterministic latency. |
| DOUT / DIN / SCLK / CS | SPI-compatible serial interface | 4-wire (or 2-wire with CS tied low) communication supporting register read/write and data retrieval - compatible with standard MCU SPI peripherals. |
| D0/CLKOUT | Programmable clock output / digital I/O | Generates divided master clock (e.g., fCLKIN/2, /4) or functions as general-purpose output - reduces need for external clock buffers. |
| XTAL1/CLKIN / XTAL2 | Master clock input | Accepts 2–10 MHz crystal or external oscillator - provides stable timing base for jitter-sensitive high-resolution conversions. |
Key Features
| Feature | Design Value |
|---|---|
| Sensor detect current sources | 0.5 / 2 / 10 µA programmable outputs verify open/short conditions on connected sensors - eliminates manual continuity checks in field-deployed systems. |
| Chopper-stabilized input buffer | 80 MΩ input impedance (at ≤50 Hz) with <±100 nV/°C offset drift - preserves signal integrity for high-impedance pH, strain gauge, or thermocouple sources. |
| Noise-free resolution | 23 bits at 2.5 SPS (buffer on, PGA = 1) - delivers 1 µV effective resolution over ±5 V range, matching 6½-digit DMM performance. |
| Self and system calibration | On-chip offset/gain correction for all PGA settings - removes factory-trimmed errors and compensates for temperature-induced drift without host intervention. |
| Flexible power supplies | 5 V analog supply (AVDD), 1.8–3.6 V digital supply (DVDD) - enables direct interface with modern low-voltage MCUs while maintaining analog SNR. |
Applications
| Weigh Scale Systems | Medical Patient Monitoring |
|---|---|
|
Use Scenario: High-accuracy load cell readout in platform scales and industrial weighing terminals. IC Role / Device Role / Timing Role: Primary ADC digitizing mV-level bridge outputs with 23-bit noise-free resolution at 10–100 SPS. Use Value: Enables 1:1,000,000 dynamic range and <±0.001% linearity - meets OIML R76 Class III/IIII certification requirements. |
Use Scenario: Analog front-end for ECG, EEG, and bioimpedance measurement in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise digitization of µV-level biopotentials with programmable gain and sensor fault detection. Use Value: 27 nV input-referred noise and automatic open-sensor alert reduce false alarms and improve clinical reliability. |
| Industrial Process Transmitters | Test & Measurement Equipment |
|
Use Scenario: 4–20 mA loop-powered sensor transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Precision ADC capturing RTD, thermocouple, or pressure sensor signals under tight power budgets. Use Value: 38 mW normal-mode power and integrated calibration allow full functionality within 3.5 mA loop budget. |
Use Scenario: DC voltage/current measurement module in benchtop multimeters and automated test systems. IC Role / Device Role / Timing Role: High-stability digitizer with 24-bit no-missing-codes output and fast channel cycling (18.6 noise-free bits @ 1.45 kHz). Use Value: Eliminates external zero-drift amplifiers and reference buffers - reduces BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRTCT | 32-channel scan capability, same 24-bit resolution and 23-bit noise-free performance, but uses QFN-48 package and requires external reference. | Designed for high-channel-count data acquisition systems (e.g., DAQ cards), not optimized for compact 8-input sensor nodes. | Select when expanding beyond 8 analog inputs or requiring integrated sequencer logic - not drop-in for ADS1256IDBRG4 PCB layouts. |
| LTC2440IG#PBF | 24-bit delta-sigma ADC with 200 nV RMS noise (vs. 247 nV for ADS1256), SPI interface, but only two differential inputs and no sensor detect circuitry. | Targeted at low-channel, ultra-low-noise applications (e.g., laboratory standards), lacks multiplexer flexibility and built-in diagnostics. | Choose for minimal-noise priority in 2-channel systems where open-sensor detection is handled externally - requires redesign of analog front-end. |
Compared with ADS1256IDBRG4, ADS1258IRTCT adds channel count at the cost of footprint and layout compatibility, while LTC2440IG#PBF trades multiplexing and diagnostics for marginally lower noise in simpler topologies - neither offers pin-to-pin or functional drop-in replacement.
Availability
ADS1256IDBRG4 is available at Aetrix Electronics and suitable for weigh scale systems, medical patient monitoring equipment, and industrial process transmitters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS1256IDBRG4 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 industrial-grade IC design.
The ADS1256IDBRG4 belongs to TI's precision delta-sigma ADC product line, engineered specifically for high-accuracy, low-noise measurement applications in scientific instrumentation, medical devices, and industrial control systems.
FAQ
What is the maximum achievable noise-free resolution of the ADS1256IDBRG4?
The ADS1256IDBRG4 achieves up to 23 bits of noise-free resolution at 2.5 SPS with input buffer enabled and PGA = 1, as confirmed in Table 3 of the SBAS288K datasheet. This value drops to 17.1 bits at 30 kSPS under identical conditions - a direct tradeoff between speed and resolution governed by the digital filter's oversampling ratio. The ADS1256IDBRG4 maintains no missing codes across all data rates and gain settings.
Does the ADS1256IDBRG4 support true differential input measurements?
Yes, the ADS1256IDBRG4 supports true differential measurements using any two of its nine analog input pins (AIN0–AIN7 plus AINCOM) as AINP and AINN. The input multiplexer allows arbitrary pairing - for example, AIN2–AIN3 or AIN5–AINCOM - with full 24-bit no-missing-codes performance and ±0.0010% INL. Common-mode rejection exceeds 95 dB at 60 Hz, improving to >110 dB when the digital filter notch is aligned to line frequency.
How does the sensor detect feature work on the ADS1256IDBRG4?
The ADS1256IDBRG4 implements sensor detect via three programmable current sources (0.5/2/10 µA) routed through the input multiplexer. When enabled, these sources inject current into one input and sink it from another, measuring the resulting IR drop across the external sensor. The ADS1256IDBRG4 automatically enables its input buffer during detection to prevent loading, and activates a 3 V clamp on AINP if voltage exceeds that threshold - ensuring safe operation during fault diagnosis.
Can the ADS1256IDBRG4 operate with a 3.3 V digital supply?
Yes, the ADS1256IDBRG4 supports DVDD from 1.8 V to 3.6 V, making 3.3 V fully compliant. All digital I/Os (DIN, SCLK, CS, RESET, SYNC/PDWN, XTAL1/CLKIN) are 5 V tolerant, allowing direct connection to 3.3 V microcontrollers without level shifters. DVDD = 3.3 V yields 2 mA typical digital supply current in normal mode and 95 µA in standby - verified in Section 4 of the SBAS288K datasheet.
What package type and pin count does the ADS1256IDBRG4 use?
The ADS1256IDBRG4 is packaged in a 28-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, as confirmed in the "PIN ASSIGNMENTS" section (page 5) and "ORDERING INFORMATION" of the SBAS288K datasheet. This matches the ADS1256 variant exclusively - the ADS1255 uses SSOP-20. The "G4" suffix denotes TI's green (lead-free/RoHS) packaging standard.
ADS1256IDBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 30k
- Number of Inputs:
- 4, 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:
- 5V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1256IDBRG4 FAQ
1.How can I place an order for ADS1256IDBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1256IDBRG4 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 ADS1256IDBRG4 reliable?
The price and inventory of ADS1256IDBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1256IDBRG4 is usually 5 days.
3.What payment methods are accepted for ADS1256IDBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1256IDBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1256IDBRG4?
ADS1256IDBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1256IDBRG4 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 ADS1256IDBRG4?
For technical support, including ADS1256IDBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1256IDBRG4 requirements.
6.How does Aetrix verify that ADS1256IDBRG4 is sourced from the original manufacturer or authorized distributors?
All ADS1256IDBRG4 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 ADS1256IDBRG4 meets industry standards.
7.What is the process for return or replacement of ADS1256IDBRG4?
All ADS1256IDBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1256IDBRG4, 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 ADS1256IDBRG4 part is unused and in its original packaging.
Return procedure for ADS1256IDBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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