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Analog Devices Inc. LTC2488CDE#PBF
- Part No.:
- LTC2488CDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2488CDE#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:597
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Product details
Overview
LTC2488CDE#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 4-channel (2-differential) delta-sigma ADC with Easy Drive input current cancellation, 2 ppm INL, 1 ppm offset error, and simultaneous 50 Hz/60 Hz rejection - designed for direct digitization of high-impedance sensors in industrial process control systems.
For engineers reviewing the LTC2488CDE#PBF datasheet, LTC2488CDE#PBF pinout, LTC2488CDE#PBF application, or LTC2488CDE#PBF equivalent, key selection considerations include rail-to-rail input common-mode range (GND to VCC), zero differential input current, no-latency digital filter settling, internal oscillator operation, and 14-lead DFN package compatibility with space-constrained sensor interfaces.
Technical Context
The LTC2488CDE#PBF 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, enabling direct connection of sensors with source impedances up to 100 kΩ without external buffering.
It supports flexible serial interface modes: internal SCK (38.4 kHz master clock output) or external SCK (up to 4 MHz), with CS-controlled wake/sleep cycling and 24-bit SPI-compatible data output. The integrated oscillator runs at 307.2 kHz when FO = GND, enabling simultaneous 50 Hz/60 Hz line-frequency rejection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonic transfer function across full input range. |
| INL | 2 ppm of VREF - ensures ≤0.0002% deviation from ideal transfer curve for precision measurement. |
| Offset Error | 1 ppm of VREF (typical) - enables sub-microvolt DC accuracy in low-level sensor applications. |
| Full-Scale Error | ±32 ppm of VREF - maintains <0.0032% gain accuracy over temperature and supply variation. |
| Noise | 0.6 µVRMS - corresponds to 600 nV RMS noise floor, supporting 0.02 LSB transition noise performance. |
| Input Range | –0.5×VREF to +0.5×VREF differential - supports bipolar signal digitization with rail-to-rail common-mode inputs (0 V to VCC). |
| Power | 160 µA typical conversion current, 1 µA sleep current - enables battery-operated or ultra-low-power sensing nodes. |
Pinout & Package
Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND). RoHS-compliant, lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FO (1) | Frequency control input | Configures internal oscillator (307.2 kHz) when grounded; accepts external clock (10–1000 kHz) for adjustable data rate and filter null tuning. |
| SDI (2) | Serial data input | Selects analog input channel (CH0–CH3, COM) during data I/O cycle; first conversion after selection is valid. |
| SCK (3) | Bidirectional serial clock | Output in internal mode (38.4 kHz); input in external mode (≤4 MHz); mode set by SCK state at power-up/CS edge. |
| CS (4) | Active-low chip select | Wakes device from sleep (1 µA) into conversion/data I/O; aborts ongoing transfer if raised mid-cycle. |
| SDO (5) | Three-state serial data output | Outputs 24-bit conversion result on falling SCK edges; indicates conversion status (HIGH = in progress, LOW = complete). |
| GND (6) | Analog/digital ground | Primary reference for analog circuitry and digital I/O; requires low-impedance PCB plane connection. |
| COM (7) | Common negative input | Shared IN– for single-ended channels; supports rail-to-rail voltage (GND – 0.3 V to VCC + 0.3 V). |
| CH0–CH3 (8–11) | Analog input channels | Programmable as single-ended (vs. COM) or differential pairs; all support full common-mode range. |
| VCC (12) | Supply voltage | 2.7 V to 5.5 V operation; requires 10 µF tantalum + 0.1 µF ceramic bypass close to pin. |
| REF+ / REF– (13–14) | Differential reference inputs | Accept 0.1 V to VCC differential reference; common-mode range spans GND to VCC independently of VREF magnitude. |
| Exposed Pad (15) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates differential input current errors, enabling direct digitization of high-Z sensors (e.g., RTDs, thermocouples) without op-amp buffers. |
| No-latency digital filter | Settles in one conversion cycle - no filter delay or redundant samples; first result after channel change meets full spec. |
| Simultaneous 50 Hz/60 Hz rejection | Integrated FIR filter rejects both line frequencies without external notch components or software post-processing. |
| Auto-calibration per conversion | Performs offset and full-scale calibration before every conversion, ensuring stability against temperature, supply, and channel-dependent drift. |
| Rail-to-rail input common-mode range | Supports IN+/IN– voltages from GND – 0.3 V to VCC + 0.3 V - accommodates signals beyond supply rails in sensor fault conditions. |
Applications
| Direct Temperature Measurement | Industrial Process Control |
|---|---|
Use Scenario: Digitizing outputs from Pt100 RTDs or Type-K thermocouples in HVAC or chemical plant monitoring cabinets. IC Role / Device Role / Timing Role: Precision ADC front-end with built-in line-frequency rejection and zero-input-current interface to unbuffered sensors. Use Value: Eliminates external instrumentation amplifiers and 50/60 Hz notch filters, reducing BOM count and layout area while maintaining ±0.1°C measurement accuracy. | Use Scenario: Monitoring pressure, flow, and level transmitters in PLC analog input modules operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC with auto-calibration and robust CMRR (>140 dB DC/50/60 Hz) for stable long-term operation. Use Value: Delivers 16-bit integrity over temperature (-40°C to 70°C) and supply variation without recalibration, extending maintenance intervals. |
| Data Acquisition System | Instrumentation |
Use Scenario: Portable multichannel sensor logger capturing vibration, strain, and humidity using mixed single-ended and differential inputs. IC Role / Device Role / Timing Role: 4-channel multiplexed ADC with seamless channel switching and no latency - each new channel yields valid data immediately. Use Value: Enables true multi-sensor time-synchronized sampling without inter-channel delay or filter settling overhead. | Use Scenario: Benchtop digital multimeter or portable calibrator requiring high DC accuracy and low noise for voltage/current measurements. IC Role / Device Role / Timing Role: Low-noise (0.6 µVRMS) ADC with 2 ppm INL and 1 ppm offset - serves as core metrology engine for calibrated instruments. Use Value: Meets Class I DMM accuracy requirements without external zero-drift chopper amplifiers or complex calibration routines. |
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, integrated PGA, lower noise (0.19 µVRMS), but requires external reference and lacks simultaneous 50/60 Hz rejection. | Preferred for ultra-high-resolution weigh scales or medical ECG; less suitable for line-powered industrial sensors where built-in rejection is critical. | Select ADS124S08IPWR when resolution >16-bit and programmable gain are required; choose LTC2488CDE#PBF for simpler 16-bit systems needing plug-and-play line rejection. |
| MAX11206ETL+ | 18-bit, 2-channel, no internal oscillator, higher supply current (380 µA), supports only external clock and external reference. | Better for battery-powered handheld meters with tight size constraints (12-pin TQFN); lacks Easy Drive and rail-to-rail common-mode input. | Choose MAX11206ETL+ for compact, low-voltage (2.7 V) portable designs; LTC2488CDE#PBF better fits industrial AC-line-powered systems with high-impedance sensors. |
Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2488CDE#PBF uniquely combines 16-bit precision, zero-differential-input-current interface, simultaneous 50/60 Hz rejection, and internal oscillator in a single 4 mm × 3 mm DFN - reducing system complexity and component count for industrial sensor digitization.
Availability
LTC2488CDE#PBF is available at Aetrix Electronics and suitable for industrial process control, direct temperature measurement, and portable data acquisition systems requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LTC2488CDE#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 LTC2488CDE#PBF belongs to ADI's legacy Linear Technology precision delta-sigma ADC product line, engineered specifically for high-accuracy, low-power, multi-channel sensor digitization in electrically noisy environments.
FAQ
What is the operating temperature range for the LTC2488CDE#PBF?
The LTC2488CDE#PBF is specified for the commercial temperature range of 0°C to 70°C. This grade is validated per the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, with parameters like INL, offset error, and full-scale error guaranteed across this range. It is distinct from the industrial-grade LTC2488IDE#PBF (–40°C to 85°C).
Does the LTC2488CDE#PBF require an external reference voltage?
No - the LTC2488CDE#PBF accepts an external differential 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 0.1 V to VCC, and the device maintains full 16-bit accuracy and 2 ppm INL across this range when properly decoupled.
How does the Easy Drive technology in the LTC2488CDE#PBF eliminate input current errors?
The LTC2488CDE#PBF uses a patented passive sampling network that automatically cancels differential input current at the modulator input stage. This eliminates dynamic errors caused by external source impedance, allowing direct connection of high-Z sensors (e.g., 100 kΩ thermistors) without buffer amplifiers while preserving DC accuracy - confirmed by 0 ppm differential input current specification and full-scale error vs. source resistance plots.
Can the LTC2488CDE#PBF operate with a single-ended input configuration?
Yes - the LTC2488CDE#PBF supports both differential (e.g., CH0–CH1) and single-ended (e.g., CH0 vs. COM) configurations. All four analog inputs (CH0–CH3) and the COM pin accept rail-to-rail voltages (GND – 0.3 V to VCC + 0.3 V), and any combination can be selected via SDI command. The first conversion after reconfiguration is fully valid and meets all specifications.
What is the purpose of the FO pin on the LTC2488CDE#PBF?
FO (Frequency Override) is a digital input that selects the conversion clock source: when FO = GND, the LTC2488CDE#PBF uses its internal 307.2 kHz oscillator for fixed-rate operation and simultaneous 50/60 Hz rejection; when driven with an external clock (10–1000 kHz), FO enables adjustable data rates and tunable digital filter nulls - critical for custom line-frequency or harmonic rejection in specialized applications.
LTC2488CDE#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2488CDE#PBF FAQ
1.How can I place an order for LTC2488CDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2488CDE#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 LTC2488CDE#PBF reliable?
The price and inventory of LTC2488CDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2488CDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2488CDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2488CDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2488CDE#PBF?
LTC2488CDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2488CDE#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 LTC2488CDE#PBF?
For technical support, including LTC2488CDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2488CDE#PBF requirements.
6.How does Aetrix verify that LTC2488CDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2488CDE#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 LTC2488CDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2488CDE#PBF?
All LTC2488CDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2488CDE#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 LTC2488CDE#PBF part is unused and in its original packaging.
Return procedure for LTC2488CDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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