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Texas Instruments ADS1254E/2K5G4
- Part No.:
- ADS1254E/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS1254E/2K5G4.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
ADS1254E/2K5G4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with no missing codes, 19-bit effective resolution at 20kHz data rate, 1.8ppm rms noise, four differential input channels, and separate 1.8V–3.6V digital supply. It serves as the precision front-end digitizer in high-accuracy measurement systems such as cardiac diagnostics and chromatography.
For engineers reviewing the ADS1254E/2K5G4 datasheet, ADS1254E/2K5G4 pinout, ADS1254E/2K5G4 application, or ADS1254E/2K5G4 equivalent, key selection criteria include its 24-bit no-missing-codes performance, 20kHz maximum data rate with 4.24kHz –3dB bandwidth, 15ppm max INL, external reference support (0.5V–5V), and SSOP-20 package compatibility for space-constrained industrial sensor interfaces.
Technical Context
The ADS1254E/2K5G4 employs a fourth-order delta-sigma modulator with fixed 64× oversampling and a Sinc5 digital filter, delivering 24-bit resolution and 19-bit effective resolution up to 20.8kHz output rate. Its modulator clock is derived from the system CLK (8MHz typical) divided by 6, yielding 1.333MHz modulation frequency.
It features a fully differential switched-capacitor input architecture enabling 102dB CMRR at 60Hz, 88dB PSRR, ±100mA momentary analog input current tolerance, and channel multiplexing via CHSEL0/CHSEL1 pins with five-cycle digital filter settling time. The DOUT/DRDY pin operates in dual-mode-DRDY signaling valid data availability and DOUT shifting out 24-bit offset binary two's complement words MSB-first.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24 bits - guarantees no missing codes across full-scale range, essential for metrology-grade linearity. |
| Data Rate | 20.8 kHz - supports real-time acquisition of fast physiological or process signals without aliasing when paired with appropriate anti-alias filtering. |
| Effective Resolution | 19 bits at 20kHz - corresponds to 1.8ppm rms noise, enabling sub-µV-level signal detection in low-drift applications. |
| INL | ±15 ppm max - ensures <0.0015% full-scale error, critical for calibration-critical instrumentation like blood analyzers. |
| Reference Range | 0.5 V to 5 V - allows flexible full-scale adjustment; higher VREF improves SNR in ppm terms while preserving absolute noise floor. |
| Power Consumption | 4.3–6.5 mW at 20kHz - enables battery-powered portable instrumentation with thermal stability under continuous conversion. |
| Digital Supply Range | 1.8 V to 3.6 V - supports direct interfacing with low-voltage microcontrollers and isolated digital domains. |
Pinout & Package
ADS1254E/2K5G4 is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, optimized for compact PCB layouts in medical and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1+ / CH1– CH2+ / CH2– CH3+ / CH3– CH4+ / CH4– | Differential Analog Inputs | Four independent fully differential input pairs; each pair accepts bipolar signals referenced to AGND, supporting ±VREF range with external level-shifting circuitry. |
| CHSEL0 / CHSEL1 | Digital Channel Select Inputs | Schmitt-trigger inputs that configure multiplexer state per Table I; falling edge of CLK latches new channel selection and resets conversion pipeline. |
| VREF | Analog Reference Input | Accepts buffered external reference (0.5V–5V); draws 32µA at 8MHz CLK, requiring low-noise, low-output-impedance source for optimal INL and noise performance. |
| AVDD / AGND DVDD / DGND | Analog & Digital Power/Ground | Separate analog (4.75–5.25V) and digital (1.8–3.6V) supplies minimize coupling; strict separation required to maintain 19-bit effective resolution. |
| CLK | System Clock Input | CMOS/Schmitt-trigger input driving internal modulator clock (CLK ÷ 6); determines data rate, input impedance (e.g., 125kΩ at 8MHz), and filter notch placement. |
| SCLK | Serial Clock Input | Independent CMOS clock for data readout; holding HIGH >20 DRDY cycles enters power-down mode; holding HIGH 4–20 cycles synchronizes multiple converters. |
| DOUT/DRDY | Multi-function Serial Pin | Combines Data Ready flag (active-low pulse) and serial data output (MSB-first, offset two's complement); requires precise timing per Table III to avoid incomplete reads. |
| NC (Pins 10, 11) | No Connection | Unbonded pins; must remain unconnected and floating to prevent parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| 24-bit no-missing-codes architecture | Guarantees monotonicity and absolute code integrity over temperature and supply variation-required for legal-for-trade weighing and diagnostic traceability. |
| Configurable 20kHz–100Hz data rate | Enables programmable rejection of 50/60Hz interference via digital filter notches; e.g., 10Hz output rate rejects both 50Hz and 60Hz with >135dB attenuation. |
| Four-channel differential multiplexer | Reduces component count in multi-sensor systems (e.g., ECG lead sets); channel switching incurs only five-conversion settling delay, supporting ~4kHz effective multiplexed throughput. |
| Separate DVDD supply (1.8V–3.6V) | Permits direct connection to 1.8V or 3.3V logic domains without level shifters, simplifying isolated data acquisition designs using optocouplers or digital isolators. |
| Low 1.8ppm rms noise at 20kHz | Enables 0.00018% full-scale measurement repeatability-critical for infrared pyrometers measuring <1°C temperature differentials. |
| Power-down mode (<1µA) | Extends battery life in portable chromatography analyzers; wake-up occurs on SCLK falling edge with first valid DRDY at t16 (2318.5 × tOSC). |
Applications
| Cardiac Diagnostics | Direct Thermocouple Interfaces |
|---|---|
Use Scenario: High-fidelity acquisition of low-amplitude ECG/EEG waveforms in portable monitors with >100dB dynamic range requirement. IC Role / Device Role / Timing Role: Primary ADC front-end digitizing differential biopotential signals at ≥1kHz sampling with ultra-low 1.8ppm noise floor and 15ppm INL. Use Value: Enables detection of microvolt-level ST-segment shifts without calibration drift, meeting AHA/ACC clinical accuracy thresholds. |
Use Scenario: Cold-junction-compensated thermocouple measurement in industrial ovens where ambient temperature varies from –20°C to +85°C. IC Role / Device Role / Timing Role: Precision ratiometric digitization of µV-level thermocouple outputs referenced to an RTD-based cold-junction sensor. Use Value: Delivers <0.1°C total system error over full range using internal 19-bit ENOB and 0.4ppm/°C gain drift compensation. |
| Liquid/Gas Chromatography | Precision Process Control |
Use Scenario: Peak-area integration of detector signals (e.g., FID, TCD) requiring stable 24-bit linearity across 10-minute run times. IC Role / Device Role / Timing Role: High-resolution integrator ADC capturing analog chromatogram outputs with synchronized 20kHz sampling and digital filtering. Use Value: Eliminates missing-code artifacts in peak quantification, improving reproducibility of ppm-level chemical concentration measurements. |
Use Scenario: Closed-loop control of pressure, flow, or pH transmitters in hazardous area instrumentation with SIL-2 compliance requirements. IC Role / Device Role / Timing Role: Safety-critical analog input conditioner providing redundant 24-bit digitization with built-in self-test via SYNC mode. Use Value: Supports HART protocol overlay and diagnostic logging with guaranteed monotonicity and <10ppm long-term drift. |
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 |
|---|---|---|---|
| ADS1255IPW | Same 24-bit core, but single-ended input architecture and no internal PGA; 18-bit ENOB at 20kHz vs. 19-bit for ADS1254E/2K5G4. | Lacks differential input flexibility and 4-channel mux; suited for simpler single-sensor systems with lower CMRR demands. | Select ADS1255IPW only if cost sensitivity outweighs need for differential noise rejection and multi-channel capability. |
| AD7739BRUZ | 24-bit sigma-delta ADC with integrated PGA (1–128×), 125SPS max rate, and SPI interface; no DOUT/DRDY dual-mode pin. | Optimized for slow, high-gain weigh-scale inputs-not suitable for 20kHz cardiac or chromatography waveforms. | Choose AD7739BRUZ for low-speed, high-gain bridge sensor applications where PGA integration reduces BOM count. |
Compared with ADS1255IPW and AD7739BRUZ, the ADS1254E/2K5G4 uniquely combines 20kHz data rate, four differential inputs, and 19-bit effective resolution-making it irreplaceable in multi-sensor, high-bandwidth precision measurement systems where channel density and noise floor are co-critical.
Availability
ADS1254E/2K5G4 is available at Aetrix Electronics and suitable for cardiac diagnostics, liquid/gas chromatography, and precision process control requiring stable component supply across extended production lifecycles.
Supply support for ADS1254E/2K5G4 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 heritage in precision data conversion and industrial signal chain solutions.
The ADS1254E/2K5G4 belongs to TI's high-accuracy delta-sigma ADC product line, engineered specifically for demanding measurement applications including medical instrumentation, analytical equipment, and smart industrial transmitters.
FAQ
What is the maximum data rate supported by the ADS1254E/2K5G4?
The ADS1254E/2K5G4 achieves a maximum data rate of 20.8 kHz when operated with an 8 MHz system clock. This rate scales linearly with CLK frequency per Table II in the datasheet; for example, a 7.3728 MHz clock yields 19.2 kHz. The device maintains 19-bit effective resolution up to this maximum rate, with –3dB bandwidth at 4.24 kHz.
Does the ADS1254E/2K5G4 support true bipolar input ranges like ±2.5V or ±5V?
Yes-the ADS1254E/2K5G4 supports true bipolar inputs via external op-amp level-shifting circuits as shown in Figure 2 of the datasheet. Using OPA4350 and precision resistors, ±2.5V, ±5V, and ±10V ranges can be interfaced while maintaining full 24-bit linearity and common-mode rejection.
How does the ADS1254E/2K5G4 achieve 50Hz/60Hz notch rejection?
The ADS1254E/2K5G4 uses its Sinc5 digital filter's inherent notch structure: setting the data output rate to 50 Hz (via 19.2 kHz CLK) places the first notch at 50 Hz, rejecting mains interference. Similarly, 60 Hz rejection uses 23.04 kHz CLK. Both 50/60 Hz rejection is achieved at 10 Hz output rate (3.84 kHz CLK), providing >135 dB attenuation.
What is the purpose of the DOUT/DRDY pin's dual-mode operation?
The DOUT/DRDY pin on the ADS1254E/2K5G4 serves two time-multiplexed functions: DRDY signals valid data availability with a low pulse, then transitions to DOUT mode to serially shift out the 24-bit result MSB-first. This eliminates the need for separate control lines, reducing isolation component count in medical or hazardous-area designs.
Can the ADS1254E/2K5G4 operate with a 3.3V digital supply?
Yes-the ADS1254E/2K5G4 supports DVDD from 1.8 V to 3.6 V, making 3.3 V fully compliant. When using 3.3 V DVDD, VIH = 2.145 V min and VOL = 0.4 V max per electrical characteristics; ensure host MCU GPIOs meet these thresholds for reliable communication.
ADS1254E/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 20k
- Number of Inputs:
- 4
- Input Type:
- Differential
- 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:
- 5V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1254E/2K5G4 FAQ
1.How can I place an order for ADS1254E/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1254E/2K5G4 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 ADS1254E/2K5G4 reliable?
The price and inventory of ADS1254E/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1254E/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS1254E/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1254E/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1254E/2K5G4?
ADS1254E/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1254E/2K5G4 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 ADS1254E/2K5G4?
For technical support, including ADS1254E/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1254E/2K5G4 requirements.
6.How does Aetrix verify that ADS1254E/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS1254E/2K5G4 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 ADS1254E/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS1254E/2K5G4?
All ADS1254E/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1254E/2K5G4, 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 ADS1254E/2K5G4 part is unused and in its original packaging.
Return procedure for ADS1254E/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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