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Analog Devices Inc. LTC2348CLX-18#PBF
- Part No.:
- LTC2348CLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2348CLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
LTC2348CLX-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, octal-channel simultaneous-sampling SAR ADC with differential ±10.24V SoftSpan input flexibility, 200ksps per channel throughput, 96.7dB SNR, ±3LSB INL (max), and integrated 4.096V reference buffer - designed for high-voltage industrial process control and power line monitoring signal chains.
For engineers reviewing the LTC2348CLX-18#PBF datasheet, LTC2348CLX-18#PBF pinout, LTC2348CLX-18#PBF application, or LTC2348CLX-18#PBF equivalent, key selection criteria include per-channel programmable input ranges (±10.24V/0–10.24V/±5.12V/0–5.12V), 118dB CMRR at 200Hz, rail-to-rail overdrive tolerance, SPI/LVDS serial interface support, and guaranteed operation to +70°C in 48-lead LQFP.
Technical Context
The LTC2348CLX-18#PBF implements a true 18-bit successive approximation register architecture with internal conversion clock and zero-cycle latency. Its analog front-end features independently configurable SoftSpan inputs per channel, enabling mixed-range acquisition across all eight channels without external multiplexing or gain switching.
It supports dual digital interfaces: pin-selectable CMOS (1.8V–5V OVDD) with 1–8 data lanes, and LVDS with differential SCKI/SDO pairs. The device integrates a buffered 4.096V reference (REFBUF), accepts external reference via REFIN, and maintains 140mW typical power dissipation at full 200ksps/8-channel operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit, guaranteed no missing codes - ensures full dynamic range utilization without code gaps in precision measurement. |
| Sampling Rate | 200ksps per channel (8-channel simultaneous sampling) - enables real-time capture of fast transients across multiple sensors. |
| INL (Max) | ±3 LSB at ±10.24V range - limits absolute accuracy error to ±0.0076% FS, critical for calibration-sensitive applications. |
| SNR (Typ) | 96.7dB at fIN = 2kHz - delivers >15.7 effective bits, supporting high-fidelity waveform reconstruction. |
| CMRR (Typ) | 118dB at 200Hz - rejects common-mode noise from motor drives or long sensor cables in noisy industrial environments. |
| Input Ranges | Per-channel SoftSpan: ±10.24V, 0–10.24V, ±5.12V, 0–5.12V - eliminates need for external level-shifting or attenuation circuitry. |
| Package | 48-lead (7mm × 7mm) LQFP - provides thermal performance suitable for convection-cooled industrial PCBs. |
Pinout & Package
48-lead plastic LQFP (LX package), 7mm × 7mm body, 0.5mm pitch, exposed pad not electrically connected. Thermal resistance θJA = 53°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+ | Differential analog input positive | Accepts signals up to VCC – 4V; supports wide common-mode range (VEE to VCC – 4V) for direct high-voltage sensing. |
| IN0– to IN7– | Differential analog input negative | True bipolar drive (IN– = 0V) or fully differential (IN– = –IN+) supported; rail-to-rail overdrive tolerance prevents latch-up. |
| VCC / VEE | Analog supply rails | Wide operating range: VCC = 0–38V, VEE = –16.5–0V, ΔV = 10–38V - enables direct connection to ±15V or +24V/–15V industrial supplies. |
| REFIN / REFBUF | Reference input/buffer output | REFIN accepts 1.25–2.2V external reference; REFBUF outputs 4.096V (±5mV) with 1.5mA drive capability for all 8 channels. |
| CS / CNV / BUSY | Digital control interface | CS enables SPI/LVDS bus; CNV initiates conversion with 40ns min pulse width; BUSY indicates conversion status with 30ns delay from CNV↑. |
| SDO0–SDO7 / SCKO / SCKI | Serial data I/O | Configurable CMOS (1–8 lanes) or LVDS interface; SDO timing referenced to SCKI edge with <1ns skew - simplifies high-speed FPGA interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan configuration | Independent range selection (±10.24V/0–10.24V/±5.12V/0–5.12V) on every conversion - enables mixed-sensor acquisition without external reconfiguration. |
| Simultaneous sampling & hold | Eight independent S/H circuits eliminate inter-channel timing skew - essential for phase-accurate power quality analysis. |
| Integrated reference buffer | 4.096V output with ±5mV accuracy and 1.5mA drive - powers all 8 ADC channels without external op-amp buffering. |
| Rail-to-rail input overdrive tolerance | Withstands differential overvoltage up to ±(VCC – VEE) without corruption - protects against transient surges in motor control feedback loops. |
| 118dB CMRR at 200Hz | Rejects common-mode noise from shared ground paths or EMI-coupled cables - improves accuracy in PLC backplanes and distributed I/O systems. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: Monitoring analog inputs from pressure, temperature, and flow sensors in modular PLC racks with mixed voltage requirements. IC Role / Device Role / Timing Role: Simultaneous 8-channel digitization of ±10V/0–10V field signals with per-channel SoftSpan configuration and 200ksps sustained rate. Use Value: Eliminates external signal conditioning per channel, reduces BOM count by >30%, and maintains sub-0.01% total harmonic distortion across full temperature range. |
Use Scenario: Closed-loop control of chemical reactor parameters using multi-point thermocouple and strain gauge measurements. IC Role / Device Role / Timing Role: High-precision, synchronized acquisition of differential sensor outputs with 118dB CMRR to suppress ground-loop noise in 4–20mA loop environments. Use Value: Enables 16+ ENOB performance at 2kHz, supporting ISO 50001-compliant energy efficiency analytics without oversampling or digital filtering overhead. |
| Power Line Monitoring | Test and Measurement Equipment |
Use Scenario: Real-time harmonic analysis and fault detection in 3-phase AC distribution systems with neutral current sensing. IC Role / Device Role / Timing Role: Simultaneous sampling of 8 voltage/current transformer outputs with ±10.24V full-scale and 96.7dB SNR for IEEE 519-compliant THD measurement. Use Value: Captures 50th harmonic (2.5kHz) with <–109dB THD, meeting Class A PQ analyzer accuracy requirements per IEC 61000-4-30 Ed.3. |
Use Scenario: Modular data acquisition modules for automated test equipment requiring flexible input scaling and low-latency streaming. IC Role / Device Role / Timing Role: Configurable 18-bit digitizer with SPI/LVDS interface options, supporting both FPGA-based real-time processing and USB-hosted PC acquisition. Use Value: Reduces firmware complexity via hardware-configurable ranges and delivers deterministic 500ns conversion time per channel - enabling tight jitter control in production test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 18-bit, 8-channel, ±10V/0–10V ranges; 1MSPS aggregate (125ksps/channel); uses external reference; 64-lead LQFP. | Higher aggregate throughput but lower per-channel rate; requires external reference buffer and level-shifting for bipolar operation. | Select when system prioritizes higher sample density over per-channel simultaneity or integrated reference simplicity. |
| ADS8688 | 16-bit, 8-channel, ±10.24V/0–10.24V; 1MSPS aggregate (125ksps/channel); integrated reference; SPI-only; 48-lead TQFP. | 2-bit lower resolution; no LVDS option; lacks simultaneous sampling - uses internal mux with 1.2μs channel settling. | Select for cost-sensitive applications where 16-bit ENOB suffices and LVDS noise immunity is unnecessary. |
Compared with AD7606C-18 and ADS8688, the LTC2348CLX-18#PBF uniquely delivers true 200ksps/channel simultaneous sampling with integrated 4.096V reference buffer and pin-selectable LVDS - making it optimal for phase-critical power analytics and compact industrial DAQ where board space and analog design complexity are constrained.
Availability
LTC2348CLX-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and power line monitoring equipment requiring stable component supply, extended temperature validation, and long-term obsolescence management.
Supply support for LTC2348CLX-18#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 acquired Linear Technology in 2017 and maintains its high-performance precision analog portfolio, emphasizing signal chain integrity, low-noise design, and industrial-grade reliability.
The LTC2348-18 product line targets high-accuracy industrial data acquisition, delivering simultaneous sampling, flexible input scaling, and robust noise immunity for demanding applications like energy metering and factory automation.
FAQ
What is the maximum operating temperature for the LTC2348CLX-18#PBF?
The LTC2348CLX-18#PBF is rated for 0°C to +70°C ambient operation, as indicated by the 'C' grade suffix. It guarantees full electrical specifications across this range, including ±3LSB INL and 96.7dB SNR, with thermal derating beyond 70°C requiring system-level validation.
Does the LTC2348CLX-18#PBF require an external reference?
No, the LTC2348CLX-18#PBF includes an integrated 4.096V reference buffer (REFBUF) that can directly drive all eight ADC channels. An external reference may be applied via REFIN (1.25–2.2V), but doing so requires disabling the internal buffer by setting REFIN = 0V.
How does the SoftSpan feature work on the LTC2348CLX-18#PBF?
The SoftSpan feature on the LTC2348CLX-18#PBF allows each of the eight input channels to be independently configured per conversion for ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V full-scale ranges using SPI register writes - enabling mixed-signal acquisition without external gain switching or level-shifting circuitry.
Can the LTC2348CLX-18#PBF interface with an FPGA using LVDS?
Yes, the LTC2348CLX-18#PBF supports LVDS serial I/O with differential SCKI and SDO pairs, 350mV differential swing, and 1.2V common-mode voltage. Timing parameters such as tSKEW (±0.4ns) and tDSDOSCKI (6ns) are specified for reliable FPGA interfacing at up to 250MHz clock rates.
What is the power consumption of the LTC2348CLX-18#PBF at full operation?
At 200ksps with all eight channels enabled and CMOS I/O mode, the LTC2348CLX-18#PBF consumes 140mW typical (169mW max), with VCC = 15V, VEE = –15V, VDD = 5V, and OVDD = 2.5V. Power drops to 30mW in Nap mode and 0.36mW in Power Down mode.
LTC2348CLX-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 8
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- LVDS - Serial, SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 8:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2348CLX-18#PBF FAQ
1.How can I place an order for LTC2348CLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2348CLX-18#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 LTC2348CLX-18#PBF reliable?
The price and inventory of LTC2348CLX-18#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2348CLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2348CLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2348CLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2348CLX-18#PBF?
LTC2348CLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2348CLX-18#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 LTC2348CLX-18#PBF?
For technical support, including LTC2348CLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2348CLX-18#PBF requirements.
6.How does Aetrix verify that LTC2348CLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2348CLX-18#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 LTC2348CLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2348CLX-18#PBF?
All LTC2348CLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2348CLX-18#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 LTC2348CLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2348CLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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