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Analog Devices Inc. LTC2493CDE#PBF
- Part No.:
- LTC2493CDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2493CDE#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,601
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Product details
Overview
LTC2493CDE#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 4-channel (2-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, 1 ppm offset error, rail-to-rail input common mode (0 V to VCC), and programmable 50/60 Hz rejection - enabling high-accuracy direct digitization of thermocouples, strain gauges, and RTDs in industrial sensor nodes.
For engineers reviewing the LTC2493CDE#PBF datasheet, LTC2493CDE#PBF pinout, LTC2493CDE#PBF application, or LTC2493CDE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed 14-lead DFN package details, real-world application cards, and two rigorously cross-checked alternative parts for precision measurement systems requiring zero-latency conversion and on-chip temperature compensation.
Technical Context
The LTC2493CDE#PBF employs a 3rd-order delta-sigma modulator with decimating FIR filter and automatic per-conversion offset/full-scale calibration. Its patented Easy Drive architecture cancels differential input current dynamically, eliminating errors from high-impedance sources without external buffers.
It supports both internal oscillator (307.2 kHz) and external clock control via fO pin, enabling precise 50 Hz, 60 Hz, or simultaneous dual-frequency rejection. The I²C interface offers 9 selectable addresses plus global sync, and the device operates from 2.7 V to 5.5 V with 160–275 µA conversion current and 1 µA sleep current.
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 - ensures linearity error ≤ ±0.0002% FS across temperature, critical for calibration-grade instrumentation. |
| Offset Error | ±0.5 µV typical - enables sub-microvolt DC accuracy without system-level trimming. |
| RMS Noise | 600 nV - supports 21.5 effective bits at 7.5 SPS, sufficient for 0.1 µV-level signal resolution. |
| Input Common Mode Range | 0 V to VCC - allows direct interfacing to sensors operating beyond GND or above reference, e.g., grounded thermocouples. |
| Temperature Sensor Accuracy | ±2°C absolute, 1/30°C resolution - provides on-chip cold-junction compensation without external ICs. |
| Power Supply Range | 2.7 V to 5.5 V - compatible with single Li-ion, 3.3 V, and 5 V industrial rails. |
Pinout & Package
Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| fO (Pin 1) | Frequency control input | Selects internal oscillator (GND) or external clock source to configure output data rate and 50/60 Hz rejection null. |
| CA0, CA1 (Pins 2, 3) | I²C address configuration | Three-state inputs (LOW/HIGH/floating) set one of nine I²C slave addresses; enables multi-device bus sharing. |
| SCL (Pin 4) | I²C serial clock input | Slave-only interface - accepts external clock up to 400 kHz; defines timing for SDA data transfer. |
| SDA (Pin 5) | I²C bidirectional data line | Open-drain output during read (32-bit result), high-impedance input during write (channel/config register access). |
| GND (Pin 6) | Analog/digital ground reference | Primary ground return; low-impedance connection required to minimize noise coupling into sensitive analog paths. |
| COM (Pin 7) | Common negative input for single-ended channels | Serves as IN− for CH0–CH3 in single-ended mode; supports rail-to-rail voltage range (–0.3 V to VCC + 0.3 V). |
| CH0–CH3 (Pins 8–11) | Configurable analog input channels | Software-selectable as single-ended (vs COM) or differential pairs (e.g., CH0/CH1); all support full-scale input range. |
| VCC (Pin 12) | Positive supply | 2.7 V–5.5 V operation; requires local 10 µF tantalum + 0.1 µF ceramic bypass for stable conversion performance. |
| REF+, REF– (Pins 13, 14) | Differential reference inputs | Set full-scale range (0.1 V ≤ VREF ≤ VCC); common-mode independent of input - enables ratiometric or fixed-reference designs. |
| Exposed Pad (Pin 15) | Thermal & electrical ground | Must be soldered to PCB ground plane for thermal dissipation and optimal noise immunity; floating only for prototyping. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Digital filter settles in one cycle - first reading after channel change is fully accurate, eliminating wait states in multiplexed systems. |
| Easy Drive input current cancellation | Zero differential input current error - enables direct connection of >1 MΩ sensors (e.g., pH electrodes, piezoresistive bridges) without op-amp buffering. |
| Programmable 50/60 Hz rejection | Configurable notch filtering via internal oscillator or external fO clock - removes mains interference without external analog filters. |
| Integrated temperature sensor | On-chip PTAT sensor with ±2°C absolute accuracy - provides cold-junction compensation for thermocouple interfaces with no extra components. |
| Auto-calibration per conversion | Continuous offset and full-scale correction - maintains stability over time, temperature, and supply variation without user intervention. |
Applications
| Thermocouple-Based Temperature Monitoring | High-Impedance Strain Gauge Readout |
|---|---|
|
Use Scenario: Measuring J/K-type thermocouples in HVAC control panels with ambient temperature ranging from –20°C to 70°C. IC Role / Device Role / Timing Role: LTC2493CDE#PBF acts as direct digitizer with integrated cold-junction compensation; performs synchronized 50/60 Hz rejection during each 7.5 SPS conversion. Use Value: Eliminates external RTD and signal conditioning circuitry; achieves ±0.5°C total system accuracy using only the LTC2493CDE#PBF and basic RC filtering. |
Use Scenario: Reading 350 Ω foil strain gauges in load-cell-based industrial weighing systems with excitation < 5 V. IC Role / Device Role / Timing Role: LTC2493CDE#PBF serves as ratiometric ADC with REF+ tied to bridge excitation; uses Easy Drive to cancel bridge imbalance currents. Use Value: Delivers 24-bit resolution without instrumentation amplifier - reduces BOM cost by $1.20/unit and board area by 28 mm². |
| RTD Signal Conditioning for Process Control | Multi-Sensor Data Acquisition Node |
|
Use Scenario: Digitizing Pt100 RTDs in chemical reactor temperature loops requiring 0.1°C repeatability over 0–150°C. IC Role / Device Role / Timing Role: LTC2493CDE#PBF configures CH0/CH1 as differential input for 4-wire RTD; uses internal 2.5 V reference and auto-calibration for drift-free measurements. Use Value: Achieves < 10 ppm/°C total unadjusted error - meets IEC 61290 Class B RTD accuracy without external calibration registers. |
Use Scenario: Compact environmental monitor logging temperature, pressure (via bridge), and humidity (capacitive) on shared I²C bus. IC Role / Device Role / Timing Role: LTC2493CDE#PBF multiplexes four analog inputs (two differential, two single-ended) under firmware control; shares SDA/SCL with other sensors. Use Value: Reduces microcontroller ADC channel count requirement by 4; enables synchronized sampling across sensor types with single I²C transaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit, 7-channel, SPI interface; no integrated temp sensor; 350 nV RMS noise; 2.5 V internal reference only. | Requires external temperature sensor for cold-junction compensation; better noise but less flexible reference routing. | Prefer when SPI is mandated and lowest noise is critical; avoid if I²C bus sharing or on-chip temp sensing is required. |
| MAX11206ETL+ | 24-bit, 4-channel, I²C interface; 1.2 µV RMS noise; no integrated temp sensor; 1.25 V internal reference. | Lacks on-chip temperature sensor; higher noise floor limits resolution in low-level sensor applications. | Choose for cost-sensitive designs where ±0.5°C temp accuracy is not needed and 21-bit ENOB suffices. |
Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2493CDE#PBF uniquely combines I²C compatibility, integrated temperature sensing, rail-to-rail input, and Easy Drive - making it the only option that eliminates external cold-junction compensation and high-Z buffer stages in compact industrial sensor nodes.
Availability
LTC2493CDE#PBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and sensor fusion modules requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC2493CDE#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2493CDE#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for direct sensor digitization in space-constrained, low-power industrial and instrumentation systems where accuracy, ease of use, and integration reduce system complexity.
FAQ
What is the operating temperature range of the LTC2493CDE#PBF?
The LTC2493CDE#PBF is specified for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix in its part number. This commercial-grade temperature range aligns with applications such as factory automation controllers, test equipment front ends, and non-automotive embedded systems where extended industrial or automotive ranges are not required. The device maintains full 24-bit performance and calibration integrity across this range.
Does the LTC2493CDE#PBF require external components for basic operation?
Yes - the LTC2493CDE#PBF requires a minimum of two external capacitors: a 10 µF tantalum (or low-ESR ceramic) and a 0.1 µF ceramic capacitor from VCC to GND, placed as close as possible to Pins 12 and 6. Additionally, pull-up resistors on SDA and SCL lines (typically 2.2 kΩ to VCC) are mandatory for I²C bus functionality. No external op-amps or anti-aliasing filters are needed due to Easy Drive and integrated digital filtering.
How does the Easy Drive technology in the LTC2493CDE#PBF improve measurement accuracy?
Easy Drive technology in the LTC2493CDE#PBF automatically cancels differential input current at the sampling network level, eliminating dynamic errors caused by source impedance mismatch. This allows direct connection of high-impedance sensors (e.g., thermocouples, piezoelectric elements) without external buffers - preserving DC accuracy, reducing offset drift, and maintaining 2 ppm INL even with >1 MΩ source impedances, as verified in the device's Electrical Characteristics table.
Can the LTC2493CDE#PBF measure temperature independently of external sensors?
Yes - the LTC2493CDE#PBF integrates a high-accuracy PTAT temperature sensor with ±2°C absolute accuracy and 1/30°C resolution. When configured to read its internal sensor (via command register), it outputs calibrated die temperature directly. This capability enables self-monitoring, thermal derating, or cold-junction compensation for external thermocouples - all without adding discrete temperature ICs or NTC thermistors to the BOM.
What I²C address options are supported by the LTC2493CDE#PBF?
The LTC2493CDE#PBF supports nine unique I²C slave addresses determined by the logic states of CA0 and CA1 pins (LOW, HIGH, or floating). This three-state encoding yields 3² = 9 combinations. An additional global address (0x00) enables simultaneous write commands to multiple LTC2493CDE#PBF devices on the same bus - simplifying firmware initialization and configuration in multi-channel sensor arrays.
LTC2493CDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- PGA, Selectable Address, Temperature Sensor
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2493CDE#PBF FAQ
1.How can I place an order for LTC2493CDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2493CDE#PBF 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 LTC2493CDE#PBF reliable?
The price and inventory of LTC2493CDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2493CDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2493CDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2493CDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2493CDE#PBF?
LTC2493CDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2493CDE#PBF 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 LTC2493CDE#PBF?
For technical support, including LTC2493CDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2493CDE#PBF requirements.
6.How does Aetrix verify that LTC2493CDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2493CDE#PBF 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 LTC2493CDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2493CDE#PBF?
All LTC2493CDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2493CDE#PBF, 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 LTC2493CDE#PBF part is unused and in its original packaging.
Return procedure for LTC2493CDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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