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Analog Devices Inc. LTC2488CDE#TRPBF
- Part No.:
- LTC2488CDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2488CDE#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,079
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Product details
Overview
LTC2488CDE#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 4-channel (2-differential) delta-sigma ADC with Easy Drive input current cancellation, integrated oscillator, and simultaneous 50Hz/60Hz rejection. It operates from 2.7V to 5.5V, delivers 2ppm INL, 1ppm offset error, and 600nV RMS noise, enabling direct digitization of rail-to-rail, high-impedance sensor signals in industrial process control systems.
For engineers reviewing the LTC2488CDE#TRPBF datasheet, LTC2488CDE#TRPBF pinout, LTC2488CDE#TRPBF application, or LTC2488CDE#TRPBF equivalent, key selection criteria include its no-latency digital filter, GND-to-VCC input common-mode range independent of reference voltage, single-cycle filter settling after channel change, and compatibility with SPI-based host controllers requiring high DC accuracy without external buffering.
Technical Context
The LTC2488CDE#TRPBF implements a 3rd-order delta-sigma modulator with decimating FIR filtering and automatic per-conversion offset/full-scale calibration. Its Easy Drive architecture cancels differential input current via passive sampling network, eliminating dynamic errors from source impedances up to 100kΩ.
It supports dual clocking modes: internal oscillator at 307.2kHz (FO = GND) or external clock on FO pin (10–1000kHz), enabling configurable conversion time (144.1–149.9ms for simultaneous 50/60Hz rejection) and flexible SPI interface operation with either internal or external SCK generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full input range. |
| INL | 2 ppm of VREF - ensures linearity error ≤ ±0.0002% of full scale, critical for precision instrumentation calibration. |
| Offset Error | ±0.5 µV typical - enables sub-microvolt baseline stability for low-level thermocouple or bridge sensor measurements. |
| Noise (RMS) | 0.6 µV RMS - corresponds to 0.02 LSB transition noise, supporting 16-bit effective resolution without averaging. |
| Supply Range | 2.7V to 5.5V - allows direct interfacing with 3.3V or 5V microcontrollers and mixed-voltage sensor subsystems. |
| Input Common-Mode Range | GND to VCC - permits rail-to-rail analog inputs independent of reference voltage, simplifying front-end design. |
| 50/60Hz Rejection | Simultaneous 140 dB - eliminates power-line interference without external notch filters or software post-processing. |
| Power (Active) | 160 µA typical - enables battery-powered data loggers with multi-day operation between charges. |
Pinout & Package
Package: 14-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 15 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FO (1) | Frequency control input | Selects internal oscillator (307.2kHz, FO = GND) or external clock (10–1000kHz); determines conversion rate and filter null placement. |
| SDI (2) | Serial data input | Loads 3-bit channel select code (CH0–CH3, COM) during data I/O; first conversion after new selection is valid. |
| SCK (3) | Bidirectional clock I/O | Configured as output (internal SCK mode) or input (external SCK mode) based on power-up state; controls data timing. |
| CS (4) | Active-low chip select | Wakes ADC from sleep (CS↓), initiates data transfer, and aborts ongoing transfer if raised mid-cycle (CS↑). |
| SDO (5) | Three-state serial data output | Outputs 24-bit conversion result MSB-first; also serves as conversion status indicator (HIGH = in progress, LOW = complete). |
| GND (6) | Analog/digital ground | Primary reference for all analog and digital circuitry; requires low-impedance PCB connection. |
| COM (7) | 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 (8–11) | Analog input channels | Programmable as single-ended (vs. COM) or differential pairs (e.g., CH0+/CH1−); tolerate overvoltage up to ±0.3V beyond rails. |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass to GND. |
| REF+ / REF− (13–14) | Differential reference inputs | Set full-scale range (VREF = REF+ − REF−); support 0.1V to VCC range with GND-to-VCC common-mode capability. |
| Exposed Pad (15) | Thermal & electrical ground | Must be soldered to PCB ground plane for thermal dissipation and optimal EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates differential input current errors without on-chip buffers, enabling direct connection to sensors with source impedances >100kΩ while maintaining DC accuracy. |
| No-latency digital filter | Settles in one conversion cycle after channel change - no filter delay or invalid readings during multiplexed acquisition. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction transparently applied each cycle, ensuring long-term stability against temperature, supply, and channel-dependent drift. |
| Simultaneous 50Hz/60Hz rejection | 140 dB rejection at both frequencies achieved inherently by digital filter design - no external components or firmware compensation required. |
| Rail-to-rail input common-mode range | Supports inputs from GND – 0.3V to VCC + 0.3V independent of reference voltage - simplifies signal conditioning for wide-output sensors. |
| Low-power sleep mode | 1 µA typical quiescent current when CS = HIGH - extends battery life in portable measurement devices without sacrificing wake-up latency. |
Applications
| Industrial Temperature Monitoring | Bridge Sensor Signal Conditioning |
|---|---|
Use Scenario: Digitizing outputs from Pt100 RTDs or thermistors in factory-floor PLC modules with ambient temperatures from 0°C to 70°C. IC Role / Device Role / Timing Role: Direct sensor digitizer with integrated reference and Easy Drive front end; performs single-shot conversions triggered by host MCU. Use Value: Eliminates external op-amp buffer and anti-aliasing filter, reducing BOM count by 3–4 components while maintaining ±0.1°C measurement accuracy. | Use Scenario: Reading Wheatstone bridge outputs from pressure transducers in HVAC control systems. IC Role / Device Role / Timing Role: Precision differential ADC with programmable channel selection; rejects 50/60Hz noise from nearby AC wiring without hardware filtering. Use Value: Achieves 16-bit effective resolution at 0.01% FS accuracy despite 10kΩ bridge impedance and unshielded cabling in electrically noisy environments. |
| Portable Data Logger | Process Control Input Module |
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and CO₂ over 72-hour periods. IC Role / Device Role / Timing Role: Low-power ADC with sleep mode (1 µA) and wake-on-CS; converts sensor data at 100ms intervals using internal oscillator. Use Value: Enables >10-day battery life on a single CR2032 cell due to ultra-low active and sleep current, with no loss of measurement fidelity. | Use Scenario: DIN-rail mounted I/O module acquiring analog inputs from multiple field instruments in chemical plant control rooms. IC Role / Device Role / Timing Role: Multi-channel front-end ADC with GND-to-VCC input range; interfaces directly to 4–20mA loop receivers and isolated sensor outputs. Use Value: Supports universal input configuration (voltage/current) without rework, reducing variant SKUs and simplifying inventory management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit resolution, lower noise (150nV RMS), but requires external reference and buffer for >10kΩ sources; no built-in 50/60Hz rejection. | Used where higher resolution outweighs need for external components; less suitable for direct high-Z sensor interfacing. | Select when system demands >16-bit ENOB and can accommodate added external circuitry and calibration complexity. |
| MAX11206ETL+ | 18-bit resolution, 3.3V-only supply, integrated PGA (1–128×), but lacks Easy Drive and simultaneous 50/60Hz rejection. | Favored in compact medical sensors needing gain flexibility; not optimized for industrial line-noise immunity. | Choose for battery-powered biomedical devices requiring programmable gain and moderate noise performance, not for mains-noise-heavy industrial settings. |
Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2488CDE#TRPBF uniquely combines 16-bit precision, zero-differential-input-current operation, and inherent dual-frequency rejection in a single 4mm × 3mm package-enabling simpler, more robust designs for industrial sensor interfaces without trade-offs in size or external component count.
Availability
LTC2488CDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and sensor signal conditioning applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2488CDE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2488CDE#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for direct high-impedance sensor digitization in electrically noisy, resource-constrained industrial environments where accuracy, simplicity, and reliability are non-negotiable.
FAQ
What is the operating temperature range for the LTC2488CDE#TRPBF?
The LTC2488CDE#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "C" suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains full parametric performance-including 2ppm INL and 1ppm offset-across this entire range without derating.
Does the LTC2488CDE#TRPBF require an external reference voltage?
No, the LTC2488CDE#TRPBF accepts a fully differential external reference (REF+ and REF−), but it does not require one: REF+ may be tied to VCC and REF− to GND for simplest operation. The reference voltage range is 0.1V to VCC, and the device maintains specified noise and linearity across this range. No internal reference is provided.
How does the Easy Drive technology in the LTC2488CDE#TRPBF eliminate input current errors?
The LTC2488CDE#TRPBF uses a patented passive sampling network that automatically cancels differential input current through synchronized charge redistribution. This eliminates dynamic errors caused by source impedance mismatch, allowing direct connection to sensors with impedances up to 100kΩ while preserving DC accuracy-no external op-amp buffer is needed.
Can the LTC2488CDE#TRPBF perform simultaneous rejection of both 50Hz and 60Hz line noise?
Yes, the LTC2488CDE#TRPBF provides simultaneous 50Hz and 60Hz rejection at 140 dB minimum, achieved inherently by its digital filter architecture. This is guaranteed across temperature and supply voltage, requires no external components or firmware configuration, and applies to all input configurations (single-ended or differential).
What is the conversion time for the LTC2488CDE#TRPBF when using the internal oscillator?
With FO = GND (internal 307.2kHz oscillator), the LTC2488CDE#TRPBF achieves a conversion time of 144.1ms to 149.9ms for simultaneous 50Hz/60Hz rejection. This value is specified in the Electrical Characteristics table under "tCONV" and is fixed for this configuration-no user adjustment is required to enable the dual-frequency rejection feature.
LTC2488CDE#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:
- 16
- Sampling Rate (Per Second):
- 6.9
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- 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:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2488CDE#TRPBF FAQ
1.How can I place an order for LTC2488CDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2488CDE#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 LTC2488CDE#TRPBF reliable?
The price and inventory of LTC2488CDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2488CDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2488CDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2488CDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2488CDE#TRPBF?
LTC2488CDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2488CDE#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 LTC2488CDE#TRPBF?
For technical support, including LTC2488CDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2488CDE#TRPBF requirements.
6.How does Aetrix verify that LTC2488CDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2488CDE#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 LTC2488CDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2488CDE#TRPBF?
All LTC2488CDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2488CDE#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 LTC2488CDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC2488CDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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