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Analog Devices Inc. DC573A
- Part No.:
- DC573A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC573A.pdf
- Description:
- BOARD DELTA SIGMA ADC LTC2400
- Quantity:
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Inventory:4,014
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Product details
Overview
LTC2400 from Analog Devices (formerly Linear Technology) is a 24-bit micropower delta-sigma ADC in SO-8 package, featuring no-latency conversion, 4ppm INL, 0.3ppm RMS noise, and integrated oscillator. It delivers single-cycle settling for multiplexed sensor interfaces in precision weight scales and industrial process control systems.
For engineers reviewing the LTC2400 datasheet, LTC2400 pinout, LTC2400 application, or LTC2400 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready availability details - all grounded in official Linear Technology documentation.
Technical Context
The LTC2400 employs a delta-sigma modulator with decimating FIR filter and auto-calibrating architecture that performs offset and full-scale correction every conversion cycle. Its internal oscillator eliminates external timing components while enabling precise 50Hz or 60Hz ±2% notch rejection without latency.
It uses a flexible 3-wire SPI/MICROWIRE-compatible interface with bidirectional SCK and active-low CS, supporting both internal and external clock modes. The extended input range (–0.125×VREF to 1.125×VREF) accommodates sensor overrange and signal-conditioning offsets without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization in high-precision measurement. |
| INL | 4ppm at VREF = 5V - enables ≤0.0004% linearity error in 6½-digit DVMs and strain-gage transducer systems. |
| Output Noise | 0.3ppm RMS (1.5µVRMS at VREF = 5V) - supports sub-microvolt-level resolution in direct temperature measurement. |
| Notch Rejection | ≥110dB at 50Hz or 60Hz ±2% - eliminates mains interference in industrial environments without external filtering. |
| Supply Current | 200µA in conversion mode, 20µA in sleep - enables battery-powered operation for >1 year in low-duty-cycle instrumentation. |
| Reference Range | 0.1V to VCC - allows use of low-voltage references (e.g., 1.25V bandgap) while maintaining 24-bit effective resolution. |
| Input Range | –0.125×VREF to 1.125×VREF - absorbs ±12.5% system-level offset/overrange from preceding op-amps or sensors. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150 mil width, JEDEC MS-012AC compliant. Thermal resistance θJA = 130°C/W; max junction temperature TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass to GND for stable conversion performance. |
| VREF (Pin 2) | Reference voltage input | Accepts 0.1V–VCC; defines full-scale range and directly impacts noise floor and INL - higher VREF improves SNR but reduces INL. |
| VIN (Pin 3) | Analog input | Supports –0.125×VREF to 1.125×VREF; absolute limits –0.3V to VCC+0.3V; series resistor ≤5kΩ allowed for fault protection. |
| GND (Pin 4) | Common ground | Single-point analog/digital/reference ground connection - critical for achieving <1ppm noise and 110dB rejection. |
| CS (Pin 5) | Chip select (active low) | Wakes device from sleep (20µA) into conversion; controls SDO output enable; falling edge initiates data transfer sequence. |
| SDO (Pin 6) | Serial data output | 3-state output delivering 32-bit frame (4 status + 24 data + 4 sub-LSBs); EOC bit (bit 31) usable as interrupt to MCU. |
| SCK (Pin 7) | Bidirectional serial clock | Functions as output (internal clock mode) or input (external clock mode); weak internal pull-up active in internal mode. |
| FO (Pin 8) | Frequency control input | Selects 50Hz rejection (FO = VCC), 60Hz rejection (FO = GND), or external notch frequency fEOSC/2560 (FO = external clock). |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma conversion | Single-cycle settling enables true multiplexed multi-channel sampling without inter-channel crosstalk or settling delay. |
| Auto-calibration per conversion | Eliminates drift-induced errors - offset and full-scale remain stable across temperature, supply variation, and time without user intervention. |
| Integrated oscillator with no external components | Removes crystal, capacitor, or resistor timing network - reduces BOM count, PCB area, and calibration complexity. |
| Extended input voltage range | –12.5% to +112.5% of VREF resolves gain/offset errors from upstream signal conditioning without recalibration or trimming. |
| Flexible 3-wire SPI/MICROWIRE interface | Compatible with standard microcontroller peripherals; no configuration registers required - simplifies firmware integration. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
|
Use Scenario: High-accuracy digital weighing systems using load cells with mV/V outputs requiring 24-bit resolution and long-term stability. IC Role / Device Role / Timing Role: Primary ADC converting ratiometric bridge output; handles live-zero offset and thermal drift via auto-calibration. Use Value: Achieves ≤0.001% linearity and <1ppm/°C drift - meets OIML R76 Class III/IIIIL requirements without external calibration hardware. |
Use Scenario: Precision RTD or thermistor-based temperature monitoring in HVAC, medical devices, and environmental chambers. IC Role / Device Role / Timing Role: Direct digitization of low-level sensor voltage with programmable reference; rejects 50/60Hz ambient noise. Use Value: Enables 0.001°C resolution at 0.1°C accuracy over –40°C to +85°C - eliminates need for chopper-stabilized front-end amplifiers. |
| Gas Analyzers | Strain-Gage Transducers |
|
Use Scenario: Electrochemical or NDIR gas sensors producing low-amplitude analog signals in safety-critical industrial analyzers. IC Role / Device Role / Timing Role: Low-noise, high-INL ADC capturing ppm-level concentration changes; immune to power-line interference. Use Value: 0.3ppm RMS noise and 110dB notch rejection ensure reliable detection below 10ppm thresholds without analog filtering. |
Use Scenario: Structural health monitoring and test equipment using full-bridge strain gages under varying mechanical and thermal loads. IC Role / Device Role / Timing Role: High-resolution digitizer handling sensor offset drift and nonlinearity; supports ratiometric excitation. Use Value: Extended input range absorbs gage zero-shift up to ±12.5%, reducing field recalibration frequency by >90%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 24-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08 (Texas Instruments) | 24-bit, 4kSPS, integrated PGA and burn-out current sources; requires external reference; no internal oscillator. | Better suited for multi-channel sensor arrays with programmable gain; lacks LTC2400's extended input range and auto-calibration. | Choose ADS124S08 when PGA flexibility and channel count outweigh need for self-contained operation and ultra-low drift. |
| MAX11200 (Maxim Integrated) | 24-bit, 10SPS, 0.15ppm RMS noise, 120dB 50/60Hz rejection; single-supply 2.7–3.6V only; no extended input range. | Superior noise and rejection for ultra-low-power portable instruments; incompatible with 5V systems or overrange sensor interfaces. | Choose MAX11200 for battery-powered handheld DMMs where 3.3V operation and lowest possible noise are mandatory. |
Compared with ADS124S08 and MAX11200, the LTC2400 uniquely combines internal oscillator, extended input range, and per-conversion auto-calibration - making it optimal for fixed-installation industrial sensors where long-term stability and minimal external components are critical.
Availability
LTC2400 is available at Aetrix Electronics and suitable for precision instrumentation, industrial process control, and high-reliability weight scale applications requiring stable component supply across extended product lifecycles.
Supply support for LTC2400 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2400 belongs to ADI's legacy Linear Technology precision ADC family, designed specifically for low-power, high-accuracy DC measurement applications where drift, noise, and external component count must be minimized.
FAQ
What is the maximum recommended reference voltage for LTC2400?
The LTC2400 supports reference voltages from 0.1V to VCC. For optimal performance, VREF should not exceed VCC - and for VREF > 2.5V, the analog input range becomes limited by the absolute maximum rating of –0.3V to VCC + 0.3V. At VCC = 5.5V, the practical upper limit for VREF is 5.5V, though 2.5V–5V is most commonly used to balance noise, INL, and headroom. The LTC2400 datasheet specifies full specifications at VREF = 2.5V and 5V.
Does LTC2400 require external passive components for basic operation?
No - the LTC2400 requires no external timing components due to its integrated oscillator. Only two bypass capacitors (10µF tantalum + 0.1µF ceramic) on VCC-to-GND are mandatory for stable operation. No external resistors, crystals, or filters are needed for core functionality, including 50Hz/60Hz rejection and auto-calibration. The LTC2400 achieves full specified performance with this minimal external component count.
How does the FO pin affect LTC2400 conversion time and accuracy?
The FO pin selects the notch frequency and determines conversion time: FO = GND yields 60Hz rejection in 133ms; FO = VCC yields 50Hz rejection in 160ms. When driven by an external oscillator at frequency fEOSC (2.56–307.2kHz), conversion time becomes 20480/fEOSC ms, and notch shifts to fEOSC/2560 Hz. Accuracy remains unchanged - all configurations maintain 4ppm INL and 110dB rejection within their respective notch bands. The LTC2400 guarantees full specifications across all FO modes.
Can LTC2400 interface directly with a 3.3V microcontroller SPI port?
Yes - the LTC2400 supports VCC = 2.7V to 5.5V, and its digital I/O levels are fully compatible with 3.3V logic: VIH = 2.0V (min) and VOL = 0.4V (max) at IO = 1.6mA. When powered at 3.3V, the LTC2400 drives SDO to ≥2.8V (VOH) and accepts CS/SCK/FO at ≥2.0V as high. No level-shifting is required. The LTC2400 operates reliably in mixed-voltage systems when VCC matches the host MCU's I/O voltage.
What does the "extended input range" of LTC2400 mean in practice?
The LTC2400 accepts inputs from –0.125×VREF to 1.125×VREF - meaning it can digitize signals 12.5% below zero and 12.5% above full-scale without clipping or error. In practice, this absorbs common system-level errors: e.g., a load cell amplifier with ±10mV offset or a thermistor circuit with 5% gain drift. Unlike conventional ADCs, the LTC2400 resolves these conditions natively - eliminating need for manual zero-adjust or external offset cancellation. This behavior is guaranteed across temperature and supply for the LTC2400.
DC573A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.5
- Data Interface:
- MICROWIRE™, Serial, SPI™
- Input Range:
- -
- Power (Typ) @ Conditions:
- -
- Utilized IC / Part:
- LTC2400
- Contents:
- Board(s)
DC573A FAQ
1.How can I place an order for DC573A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC573A 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 DC573A reliable?
The price and inventory of DC573A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC573A is usually 5 days.
3.What payment methods are accepted for DC573A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC573A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC573A?
DC573A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC573A 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 DC573A?
For technical support, including DC573A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC573A requirements.
6.How does Aetrix verify that DC573A is sourced from the original manufacturer or authorized distributors?
All DC573A 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 DC573A meets industry standards.
7.What is the process for return or replacement of DC573A?
All DC573A units undergo pre-shipment inspection (PSI). If there is an issue with DC573A, 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 DC573A part is unused and in its original packaging.
Return procedure for DC573A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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