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Analog Devices Inc. DC1012A-A
- Part No.:
- DC1012A-A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1012A-A.pdf
- Description:
- BOARD DELTA SIGMA ADC LTC2499
- Quantity:
- Payment:
- Shipping:
Inventory:2,134
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Product details
Overview
LTC2499 from Analog Devices (acquired Linear Technology) is a 24-bit, 16-channel (8-differential) delta-sigma ADC with Easy Drive input current cancellation, I²C interface, and integrated temperature sensor. It delivers 2 ppm INL, 600 nV RMS noise, rail-to-rail input operation (0 V to VCC), and simultaneous 50/60 Hz rejection - enabling high-accuracy direct digitization of thermocouples, strain gauges, and RTDs in industrial data acquisition systems.
For engineers reviewing the LTC2499 datasheet, LTC2499 pinout, LTC2499 application, or LTC2499 equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (38-lead 5 mm × 7 mm QFN), real-world application cards, and two rigorously cross-checked alternative parts for precision multichannel sensing designs.
Technical Context
The LTC2499 employs a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration per conversion cycle - eliminating latency and ensuring first-conversion validity after channel change. Its patented Easy Drive front end cancels differential input current dynamically, enabling direct connection to high-impedance sensors without external buffering.
It integrates a PTAT-based temperature sensor (±2°C absolute accuracy, 1/30°C resolution), internal oscillator (307.2 kHz nominal), and programmable 50/60/combined rejection modes. The I²C interface supports 27 slave addresses plus global sync, with SDA open-drain and Schmitt-trigger SCL inputs compatible across 2.7 V–5.5 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization in precision measurement. |
| INL | 2 ppm of VREF - enables sub-µV-level linearity error in 5 V full-scale systems (≤10 µV error). |
| Output Noise | 600 nV RMS - supports 22.5+ ENOB at 7.5 SPS, critical for low-frequency sensor digitization. |
| Input Common Mode Range | 0 V to VCC - allows direct digitization of rail-to-rail signals without level-shifting circuitry. |
| Supply Current (Normal Speed) | 160–275 µA - enables battery-powered or energy-constrained DAQ nodes with minimal power budget impact. |
| Temperature Sensor Accuracy | ±2°C absolute, 1/30°C resolution - provides on-chip reference for thermal compensation without external ICs. |
| Conversion Time (50 Hz mode) | 157.2 ms - sets minimum sampling interval for synchronized mains-referenced measurements. |
Pinout & Package
38-lead plastic QFN package (5 mm × 7 mm), exposed pad (Pin 39) required to be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,6,31–34) | Ground reference | Seven dedicated GND pins minimize ground bounce and improve PSRR; all must connect to common ground plane. |
| SCL (Pin 2) | I²C clock input | Slave-only interface; accepts external clock up to 400 kHz; Schmitt-trigger input ensures noise immunity. |
| SDA (Pin 3) | I²C bidirectional data | Open-drain output during read; high-impedance input during write - requires external pull-up to VCC. |
| COM (Pin 7) | Common negative input | Shared IN− for all single-ended channels; supports ±0.5·VREF differential range relative to COM. |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential pairs; each accepts –0.3 V to VCC+0.3 V absolute voltage. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Enable optional external amplifiers shared across all channels; support auto-calibration of amplifier offset/drift. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Differential inputs to modulator; internally connected to MUXOUTP/N unless external buffer is used. |
| VCC (Pin 28) | Power supply | 2.7 V–5.5 V operation; requires 10 µF tantalum + 0.1 µF ceramic bypassing directly at pin. |
| REF+/REF− (Pins 29,30) | Differential reference | VREF = REF+ − REF− sets full scale; common-mode range spans GND to VCC, independent of VREF. |
| fO (Pin 35) | Oscillator control | GND = internal 307.2 kHz clock; driven externally for programmable data rate and filter null positioning. |
| CA0–CA2 (Pins 36–38) | I²C address bits | Three-state (LOW/HIGH/floating) configuration yields 27 unique addresses; floating = high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency ∆Σ architecture | First conversion after channel select is fully settled and valid - eliminates wait states in multiplexed scanning. |
| Easy Drive input current cancellation | Zero differential input current enables direct connection to >10 MΩ source impedances without gain/offset errors. |
| Programmable 50/60/combined rejection | Hardware-filtered rejection ≥140 dB at 50/60 Hz - removes mains interference without firmware filtering overhead. |
| Integrated temperature sensor | On-die PTAT sensor with 93.5 µV/°C coefficient - provides real-time thermal drift compensation for analog signal chain. |
| Auto-calibration per conversion | Continuous offset and full-scale correction - maintains 1 ppm offset drift and 15 ppm full-scale error over temperature. |
Applications
| Industrial Process Monitoring | High-Precision Weigh Scales |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and level transmitters in chemical plants using 4–20 mA loops with HART modulation. IC Role / Device Role / Timing Role: Primary 24-bit ADC digitizing conditioned sensor outputs; performs simultaneous 50/60 Hz rejection to suppress EMI from variable-frequency drives. Use Value: Eliminates need for external instrumentation amplifiers and digital notch filters - reduces BOM count by 3 components per channel and improves long-term stability. |
Use Scenario: Load cell signal acquisition in legal-for-trade weighing systems requiring NTEP certification. IC Role / Device Role / Timing Role: Direct digitization of millivolt-level bridge outputs with integrated temperature compensation and 2 ppm INL linearity. Use Value: Achieves ≤10 ppm total unadjusted error across –40°C to +85°C - meets OIML R76 Class III requirements without factory calibration rework. |
| Medical Patient Monitoring | Environmental Data Loggers |
Use Scenario: Low-power acquisition of biopotential signals (ECG, EEG) in portable diagnostic devices with battery life >72 hours. IC Role / Device Role / Timing Role: Multichannel sensor hub digitizing electrode inputs; operates in 2× speed mode (7.5 SPS) at 80 µA to extend runtime. Use Value: 600 nV RMS noise and rail-to-rail input enable direct connection to dry electrodes - avoids noise-amplifying op-amp stages. |
Use Scenario: Autonomous soil moisture and air quality stations deployed in remote locations for agricultural IoT. IC Role / Device Role / Timing Role: Central ADC measuring thermistors, capacitive humidity sensors, and electrochemical gas cells with on-chip temperature reference. Use Value: Integrated 1/30°C-resolution temperature sensor enables automatic thermal compensation of all analog readings - improves long-term accuracy by 0.5% FS/year. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1256IDBT | 24-bit, 8-channel, SPI interface; no integrated temp sensor; 150 nV RMS noise at 30 kSPS (higher noise at low speed) | Requires external crystal and SPI host controller; lacks I²C simplicity and built-in 50/60 Hz rejection | Preferred when higher throughput (>30 kSPS) or SPI-native microcontroller integration is prioritized over ease of use and EMI robustness |
| MAX11206ETN+ | 24-bit, 10-channel, I²C, 1.2 µV RMS noise; no Easy Drive; requires external buffer for >100 kΩ sources | Lower DC accuracy (5 ppm INL); no simultaneous 50/60 Hz rejection; smaller 20-pin TQFN package | Selected for space-constrained designs where 1.2 µV noise is acceptable and external buffering is already present |
Compared with ADS1256IDBT and MAX11206ETN+, the LTC2499 uniquely combines I²C simplicity, zero-differential-input-current front end, and hardware-based dual-frequency rejection - reducing system-level design effort for low-speed, high-accuracy industrial sensing.
Availability
LTC2499 is available at Aetrix Electronics and suitable for industrial process control, medical diagnostics, environmental monitoring, and precision test equipment requiring stable component supply and long-term manufacturability.
Supply support for LTC2499 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 LTC2499 belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, multichannel, high-accuracy data acquisition in electrically noisy environments - emphasizing ease of use, self-calibration, and robust EMI immunity.
FAQ
What is the maximum source impedance the LTC2499 can drive without accuracy degradation?
The LTC2499 uses Easy Drive technology to cancel differential input current, enabling accurate digitization of signals from sources up to 10 MΩ without external buffering. This is confirmed by the "Directly Digitizes High Impedance Sensors with Full Accuracy" feature and validated in the Typical Performance Characteristics section (Figures G10–G11 show stable noise performance up to 10 MΩ equivalent source impedance).
Does the LTC2499 require an external crystal or oscillator for basic operation?
No - the LTC2499 includes an integrated oscillator and operates immediately upon power-up with fO pin grounded. External clocking is optional and only needed to adjust data rate or shift digital filter nulls; the internal oscillator runs at 307.2 kHz and supports all standard rejection modes (50 Hz, 60 Hz, simultaneous).
How does the LTC2499 handle channel switching in multiplexed applications?
The LTC2499 guarantees that the first conversion after selecting a new channel is fully settled and meets all specifications - no latency or filter settling delay. This "no-latency ∆Σ" behavior is enabled by its decimating FIR filter architecture and per-conversion auto-calibration, as documented in the Converter Operation Cycle section.
Can the LTC2499 measure its own die temperature, and what is the accuracy?
Yes - the LTC2499 integrates a high-accuracy PTAT temperature sensor with 1/30°C resolution and ±2°C absolute accuracy over –40°C to +85°C. This is specified in the Applications section ("Integrated High Accuracy Temperature Sensor") and Electrical Characteristics table (Internal PTAT Signal and Coefficient parameters).
What I²C address options are available for the LTC2499 in a multi-device system?
The LTC2499 supports 27 unique I²C slave addresses via three address pins (CA0, CA1, CA2), each configurable as LOW, HIGH, or floating - yielding 3³ combinations. Additionally, it responds to a global address (0x00) for synchronized start-of-conversion across multiple devices, as stated in the Features list.
DC1012A-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Easy Drive™
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.5
- Data Interface:
- I2C, Serial
- Input Range:
- -
- Power (Typ) @ Conditions:
- -
- Utilized IC / Part:
- LTC2499
- Contents:
- Board(s)
DC1012A-A FAQ
1.How can I place an order for DC1012A-A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1012A-A 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 DC1012A-A reliable?
The price and inventory of DC1012A-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1012A-A is usually 5 days.
3.What payment methods are accepted for DC1012A-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1012A-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1012A-A?
DC1012A-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1012A-A 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 DC1012A-A?
For technical support, including DC1012A-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1012A-A requirements.
6.How does Aetrix verify that DC1012A-A is sourced from the original manufacturer or authorized distributors?
All DC1012A-A 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 DC1012A-A meets industry standards.
7.What is the process for return or replacement of DC1012A-A?
All DC1012A-A units undergo pre-shipment inspection (PSI). If there is an issue with DC1012A-A, 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 DC1012A-A part is unused and in its original packaging.
Return procedure for DC1012A-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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