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Analog Devices Inc. LTC2493IDE#TRPBF
- Part No.:
- LTC2493IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2493IDE#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,132
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Product details
Overview
LTC2493IDE#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 4-channel (2-differential) delta-sigma ADC with I²C interface, Easy Drive input current cancellation, integrated temperature sensor, and no-latency digital filtering. It operates from 2.7V to 5.5V, delivers 600nV RMS noise, 2ppm INL, and supports rail-to-rail inputs with zero differential input current - enabling direct digitization of high-impedance sensors in industrial process control systems.
For engineers reviewing the LTC2493IDE#TRPBF datasheet, LTC2493IDE#TRPBF pinout, LTC2493IDE#TRPBF application, or LTC2493IDE#TRPBF equivalent, key selection criteria include its guaranteed 24-bit no-missing-codes resolution, ±40°C to +85°C industrial temperature grade, integrated PTAT temperature sensor with 1/30°C resolution, simultaneous 50Hz/60Hz rejection, and 14-lead DFN package with exposed thermal pad.
Technical Context
The LTC2493IDE#TRPBF implements a third-order delta-sigma modulator with decimating FIR filter and auto-calibration engine that performs full offset and full-scale correction every conversion cycle. Its patented Easy Drive architecture eliminates dynamic differential input current via passive sampling network, removing need for external buffers while preserving DC accuracy across large source impedances.
It features a programmable I²C slave address (9 selectable addresses plus global sync), internal oscillator (307.2kHz), and flexible input configuration: any combination of single-ended or differential channels (CH0–CH3 vs COM), with first-conversion validity after channel change and GND-to-VCC common-mode range independent of reference voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization for precision measurement. |
| INL | 2 ppm of VREF - ensures linearity error ≤ ±0.0002% FS, critical for calibration-grade instrumentation. |
| Offset Error | ±0.5 µV typical - enables sub-microvolt DC measurements without external trimming. |
| RMS Noise | 0.6 µV RMS - supports 21.5 effective bits at 7.5 SPS, sufficient for strain gauge or thermopile readout. |
| Temp Sensor Accuracy | ±2°C absolute, 1/30°C resolution - allows on-chip ambient or die temperature monitoring without external sensor. |
| Common-Mode Range | GND to VCC - permits direct interfacing to sensors operating beyond reference rails (e.g., 4–20mA loop receivers). |
| Power Supply | 2.7V to 5.5V - compatible with single Li-ion, USB, or industrial 3.3V/5V rails with 160 µA typical conversion current. |
Pinout & Package
Package: 14-lead (4mm × 3mm) plastic DFN with exposed thermal pad (Pin 15 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| fO | Frequency control input | Selects internal oscillator (GND) or external clock; determines output data rate and filter null placement. |
| CA0, CA1 | I²C address configuration | Three-state pins (LOW/HIGH/floating) set one of nine device addresses for multi-drop bus operation. |
| SCL | I²C serial clock input | Slave-only interface; rising edge samples SDA input, falling edge outputs data - enables synchronous readout. |
| SDA | Bidirectional I²C data line | Open-drain output during read; high-impedance input during write - requires external pull-up to VCC. |
| GND | Analog/digital ground reference | Low-impedance connection point for decoupling and signal return; tied to exposed pad. |
| COM | Common negative input | Shared IN– for all single-ended channels; supports rail-to-rail common-mode voltage (GND–0.3V to VCC+0.3V). |
| CH0–CH3 | Configurable analog inputs | Programmable as IN+ (differential) or single-ended inputs; each accepts full-scale differential input up to ±0.5×VREF. |
| VCC | Positive supply | Must be bypassed with 10µF tantalum + 0.1µF ceramic capacitors placed adjacent to pin for noise immunity. |
| REF+, REF– | Differential reference inputs | Set full-scale range (VREF = REF+ – REF–); support 0.1V to VCC range, independent of input common-mode. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Digital filter settles in one cycle - first result after channel change is fully accurate, eliminating wait states in multiplexed systems. |
| Easy Drive input current cancellation | Zero differential input current - enables direct connection of high-Z sensors (e.g., RTDs, thermocouples) without buffer amplifiers or matching networks. |
| Simultaneous 50Hz/60Hz rejection | Single conversion rejects both line frequencies - simplifies EMI mitigation in global industrial equipment without firmware switching. |
| Integrated temperature sensor | On-die PTAT sensor with 93.5 µV/°C coefficient - provides real-time die temperature for drift compensation or thermal safety monitoring. |
| Auto-calibration per conversion | Continuous offset and full-scale correction - maintains accuracy over time, temperature, and supply variation without user intervention. |
Applications
| High-Accuracy Weigh Scales | Industrial Temperature Monitoring |
|---|---|
Use Scenario: Digitizing mV-level outputs from load cell bridges in factory floor weighing systems with 0.001% readability. IC Role / Device Role / Timing Role: Precision ADC with integrated auto-calibration and 50/60Hz rejection acting as primary sensor front-end. Use Value: Eliminates external instrumentation amplifier and line-frequency notch filters, reducing BOM count and PCB area by ≥3 components. | Use Scenario: Measuring ambient temperature near PLC I/O modules using thermistor or RTD with <1°C system-level accuracy. IC Role / Device Role / Timing Role: Dual-role ADC + on-chip temperature sensor providing cold-junction compensation and thermal derating feedback. Use Value: Enables single-chip solution for sensor + reference temperature, avoiding separate temp IC and associated routing complexity. |
| Portable Gas Analyzers | Medical Patient Monitoring |
Use Scenario: Reading electrochemical sensor outputs in battery-powered handheld gas detectors requiring low power and high DC stability. IC Role / Device Role / Timing Role: Low-power 24-bit ADC with sleep mode (1 µA) and 7.5 SPS output rate for extended battery life. Use Value: Achieves 21.5 ENOB at 7.5 SPS with only 80 µA average current - extends AA battery life to >12 months in continuous operation. | Use Scenario: Digitizing biopotential signals (ECG, EMG) in clinical-grade wearable monitors where input impedance mismatch causes baseline drift. IC Role / Device Role / Timing Role: High-input-impedance ADC front-end leveraging Easy Drive to eliminate differential current-induced errors from electrode-skin interface. Use Value: Removes need for discrete JFET-input op-amps and guarding traces, simplifying FDA-cleared design verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit, 7-channel, SPI interface; no integrated temp sensor; 350nV RMS noise; requires external reference. | Preferred for SPI-based microcontrollers and higher channel count; lacks I²C compatibility and on-chip temperature sensing. | Select when system uses SPI and needs >4 inputs; avoid if I²C bus or embedded temperature monitoring is required. |
| MAX11206ETN+ | 24-bit, 4-channel, I²C interface; no Easy Drive; 1.2µV RMS noise; ±5°C temp sensor accuracy. | Lower cost alternative with reduced noise performance and less accurate on-chip temperature sensing. | Choose for cost-sensitive industrial designs where 1.2µV noise and ±5°C temp accuracy are acceptable. |
Compared with ADS124S08IPWR and MAX11206ETN+, the LTC2493IDE#TRPBF uniquely combines I²C interface, Easy Drive input cancellation, integrated temperature sensor with ±2°C accuracy, and simultaneous 50/60Hz rejection - making it optimal for compact, low-power, sensor-direct industrial measurement nodes.
Availability
LTC2493IDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and medical patient monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2493IDE#TRPBF 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 acquired Linear Technology in 2017 and maintains its precision analog product lines with focus on high-performance signal conditioning and data conversion.
The LTC2493IDE#TRPBF belongs to Linear's No Latency Delta-Sigma ADC family, designed specifically for direct sensor digitization in noisy industrial environments where traditional buffered ADCs introduce error and complexity.
FAQ
What is the operating temperature range of the LTC2493IDE#TRPBF?
The LTC2493IDE#TRPBF is rated for –40°C to +85°C, meeting industrial temperature requirements. This grade is confirmed by the "I" suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains full electrical specifications-including 2ppm INL and 0.6µV RMS noise-across this entire range, with temperature sensor accuracy guaranteed at ±2°C absolute.
Does the LTC2493IDE#TRPBF require an external reference voltage?
No, the LTC2493IDE#TRPBF does not require an external reference. It accepts a differential reference voltage (VREF = REF+ – REF–) ranging from 0.1V to VCC, and supports ratiometric operation. When measuring its internal temperature sensor, minimum VREF is 2V. The device does not include an internal reference; users must supply VREF externally, but no precision reference IC is mandatory due to its high PSRR (>120dB) and auto-calibration.
How does Easy Drive technology benefit sensor interfacing in the LTC2493IDE#TRPBF?
Easy Drive in the LTC2493IDE#TRPBF cancels differential input current via a proprietary passive sampling network, resulting in effectively zero dynamic differential input current. This allows direct connection of high-impedance sensors (e.g., thermistors, RTDs, pH electrodes) without external op-amps or impedance-matching networks-preserving DC accuracy and simplifying layout. Common-mode current is minimized through balanced design or reference common-mode alignment.
Can the LTC2493IDE#TRPBF perform simultaneous 50Hz and 60Hz line-frequency rejection?
Yes, the LTC2493IDE#TRPBF supports simultaneous 50Hz and 60Hz rejection in a single conversion cycle. This mode is enabled by configuring the internal oscillator to 280kHz ±2% (or driving fO with an external 280kHz clock). It is explicitly documented in the Converter Characteristics table and Applications Information section, providing robust noise immunity for globally deployed equipment without firmware reconfiguration.
What is the function of the exposed pad (Pin 15) on the LTC2493IDE#TRPBF DFN package?
The exposed pad (Pin 15) on the LTC2493IDE#TRPBF is electrically connected to GND and serves as the primary thermal path. It must be soldered to the PCB ground plane for proper thermal dissipation and electrical performance. The datasheet specifies θJA = 37°C/W with the pad soldered; leaving it floating degrades thermal resistance and may cause parametric shift or reliability risk. Prototyping exceptions do not apply to production designs.
LTC2493IDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2493IDE#TRPBF FAQ
1.How can I place an order for LTC2493IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2493IDE#TRPBF 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 LTC2493IDE#TRPBF reliable?
The price and inventory of LTC2493IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2493IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2493IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2493IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2493IDE#TRPBF?
LTC2493IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2493IDE#TRPBF 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 LTC2493IDE#TRPBF?
For technical support, including LTC2493IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2493IDE#TRPBF requirements.
6.How does Aetrix verify that LTC2493IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2493IDE#TRPBF 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 LTC2493IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2493IDE#TRPBF?
All LTC2493IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2493IDE#TRPBF, 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 LTC2493IDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC2493IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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