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Analog Devices Inc. LTC2488IDE#PBF
- Part No.:
- LTC2488IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2488IDE#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:572
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Product details
Overview
LTC2488IDE#PBF 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 LTC2488IDE#PBF datasheet, LTC2488IDE#PBF pinout, LTC2488IDE#PBF application, or LTC2488IDE#PBF equivalent, key selection criteria include guaranteed no-latency conversion settling after channel change, GND-to-VCC common-mode input range independent of reference voltage, differential input current cancellation enabling >100kΩ source impedances, and integrated SPI-compatible 4-wire interface with automatic offset/full-scale calibration per cycle.
Technical Context
The LTC2488IDE#PBF implements a 3rd-order delta-sigma modulator with decimating FIR filter and on-chip autocalibration engine that performs full offset and full-scale correction every conversion cycle. Its Easy Drive architecture uses passive sampling network-based differential input current cancellation-eliminating dynamic input current errors without on-chip buffers.
It supports dual clocking modes: internal oscillator at 307.2kHz (FO = GND) or external clock (FO pin driven), enabling configurable conversion time (144.1–149.9ms for simultaneous 50/60Hz rejection). Input common-mode range spans GND – 0.3V to VCC + 0.3V, while reference common-mode range covers GND to VCC with minimum 0.1V differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-ensures monotonicity and unambiguous digital representation across full input range. |
| INL | 2 ppm of VREF-guarantees linearity error ≤0.0002% FS, critical for precision instrumentation calibration. |
| Offset Error | ±0.5 µV typical-enables sub-microvolt DC measurement stability without external trimming. |
| Noise | 0.6 µVRMS-translates to 0.02 LSB transition noise, supporting high-resolution low-frequency sensor digitization. |
| Supply Range | 2.7V to 5.5V-allows operation from single Li-ion battery or standard 3.3V/5V rails without level-shifting. |
| Common-Mode Range | GND to VCC for inputs and references-permits direct interfacing to sensors operating outside reference bounds. |
| Rejection | Simultaneous 50Hz/60Hz at ≥87 dB-eliminates mains interference without external notch filters or software averaging. |
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 source to adjust conversion rate and filter nulls. |
| SDI (2) | Serial data input | Loads 2-bit channel select code (CH0–CH3, COM) during data I/O; first conversion after change is valid. |
| SCK (3) | Bidirectional serial clock | 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 result on falling SCK edge; indicates conversion status (HIGH = in progress, LOW = complete). |
| GND (6) | Analog/digital ground | Primary reference node; requires low-impedance PCB connection to minimize noise coupling. |
| COM (7) | Common negative input | Shared IN– for all single-ended configurations; supports rail-to-rail common-mode voltage (GND–0.3V to VCC+0.3V). |
| CH0–CH3 (8–11) | Programmable analog inputs | Support single-ended (vs COM) or differential (e.g., CH0–CH1) acquisition; each pair maintains full DC accuracy. |
| 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 | Accept 0.1V–VCC differential voltage; common-mode range spans GND to VCC-no external level-shifting needed. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Digital filter settles in one cycle-even after channel reconfiguration-enabling real-time multiplexed sensing without delay penalties. |
| Easy Drive input cancellation | Eliminates differential input current dynamically, allowing direct connection of high-impedance sources (>100kΩ) without gain/offset degradation. |
| Rail-to-rail input range | Supports VIN(CM) from GND–0.3V to VCC+0.3V independent of VREF-enables direct interface to sensors beyond reference limits. |
| Auto-calibration per cycle | Performs full offset and full-scale correction before every conversion-ensures long-term stability against temperature, supply, and channel variation. |
| Integrated oscillator | On-chip 307.2kHz clock eliminates external crystal requirement while maintaining precise 50/60Hz rejection nulls. |
Applications
| Industrial Process Monitoring | Direct Temperature Sensing |
|---|---|
Use Scenario: Continuous monitoring of thermocouple, RTD, or strain gauge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision ADC front-end digitizing bipolar mV-level sensor signals with simultaneous 50/60Hz noise rejection. Use Value: Eliminates need for external instrumentation amplifiers and analog filtering, reducing BOM count and layout area while maintaining ±2ppm INL accuracy. | Use Scenario: High-accuracy cold-junction compensation and thermistor digitization in HVAC controllers. IC Role / Device Role / Timing Role: Direct sensor digitizer with GND-to-VCC input range, enabling single-supply operation without level-shifting circuitry. Use Value: 0.6µVRMS noise and 1ppm offset drift support <0.01°C temperature resolution over –40°C to +85°C industrial range. |
| Portable Instrumentation | Power Quality Analyzers |
Use Scenario: Battery-powered handheld multimeters measuring DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Low-power 16-bit ADC with 160µA conversion current and 1µA sleep mode current. Use Value: Single 3.3V or 5V supply operation and integrated calibration reduce system power budget and firmware complexity. | Use Scenario: Simultaneous voltage/current harmonic analysis in smart energy meters. IC Role / Device Role / Timing Role: Dual-channel differential ADC capturing phase-aligned waveforms with synchronized 50/60Hz rejection. Use Value: Guaranteed simultaneous 50Hz/60Hz rejection ≥87dB enables accurate THD and power factor calculation without post-processing. |
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, 2.5V internal reference, no integrated oscillator, requires external clock or crystal. | Higher resolution but lacks simultaneous 50/60Hz rejection and Easy Drive input cancellation. | Choose ADS124S08IPWR when 24-bit resolution is mandatory and external clocking/filtering is acceptable. |
| MAX11206ETL+ | 18-bit resolution, 2.5V reference, 1.2µA sleep current, SPI interface, no integrated oscillator. | Lower power sleep mode but no automatic differential input current cancellation or rail-to-rail input common-mode range. | Choose MAX11206ETL+ for ultra-low-power battery applications where input impedance <10kΩ and external buffering is feasible. |
Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2488IDE#PBF uniquely combines 16-bit precision with zero-differential-input-current operation, integrated oscillator, and true GND-to-VCC input common-mode range-making it optimal for direct high-impedance sensor interfacing in space-constrained industrial designs.
Availability
LTC2488IDE#PBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and power quality monitoring requiring stable component supply across extended temperature ranges.
Supply support for LTC2488IDE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2488IDE#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for direct sensor digitization in harsh industrial environments where rail-to-rail input range, high common-mode rejection, and immunity to mains interference are critical.
FAQ
What is the operating temperature range for the LTC2488IDE#PBF?
The LTC2488IDE#PBF is rated for –40°C to +85°C ambient operation, qualifying it for industrial-grade applications. This extended temperature range is confirmed in the Absolute Maximum Ratings table and applies to all specified electrical characteristics marked with the "l" symbol, including INL (2 ppm), offset error (±0.5 µV), and simultaneous 50Hz/60Hz rejection (≥87 dB). The device maintains full performance across this range without derating.
Does the LTC2488IDE#PBF require an external crystal or oscillator?
No, the LTC2488IDE#PBF includes an integrated 307.2kHz oscillator activated when FO is tied to GND. This eliminates the need for external timing components while ensuring precise 50Hz/60Hz rejection nulls. An external clock may be applied to FO for custom data rates, but it is not required for baseline operation. The internal oscillator frequency varies by ±0.5% over temperature and supply, which does not affect rejection performance.
How does the Easy Drive technology in the LTC2488IDE#PBF improve sensor interfacing?
Easy Drive technology in the LTC2488IDE#PBF uses a patented passive sampling network to cancel differential input current dynamically-reducing it to near-zero. This allows direct connection of high-impedance sensors (e.g., thermocouples, pH electrodes) up to 100kΩ without external op-amps or gain stages, preserving DC accuracy (2ppm INL, 1ppm offset) and eliminating errors from input bias current and RC time constants.
Can the LTC2488IDE#PBF measure inputs beyond the reference voltage range?
Yes-the LTC2488IDE#PBF supports analog input common-mode voltages from GND – 0.3V to VCC + 0.3V, independent of the reference voltage (0.1V to VCC). For example, with VCC = 5V and VREF = 2.5V, inputs can swing from –0.3V to +5.3V while maintaining full 16-bit accuracy. This rail-to-rail capability enables direct digitization of sensors whose output exceeds the reference bounds, such as certain bridge configurations or biased transducers.
What is the significance of "no latency" in the LTC2488IDE#PBF datasheet?
"No latency" means the LTC2488IDE#PBF's digital filter settles fully within a single conversion cycle-even immediately after changing input channels. Unlike conventional delta-sigma ADCs requiring multiple cycles to settle, the LTC2488IDE#PBF delivers a valid, fully accurate 16-bit result on the first conversion following channel selection. This enables deterministic, real-time multiplexed acquisition without pipeline delays or discarded samples.
LTC2488IDE#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:
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2488IDE#PBF FAQ
1.How can I place an order for LTC2488IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2488IDE#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 LTC2488IDE#PBF reliable?
The price and inventory of LTC2488IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2488IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2488IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2488IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2488IDE#PBF?
LTC2488IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2488IDE#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 LTC2488IDE#PBF?
For technical support, including LTC2488IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2488IDE#PBF requirements.
6.How does Aetrix verify that LTC2488IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2488IDE#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 LTC2488IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2488IDE#PBF?
All LTC2488IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2488IDE#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 LTC2488IDE#PBF part is unused and in its original packaging.
Return procedure for LTC2488IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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