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Analog Devices Inc. LTC2348HLX-18#PBF
- Part No.:
- LTC2348HLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2348HLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LTC2348HLX-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, octal-channel simultaneous-sampling SAR ADC with differential inputs, ±10.24V SoftSpan configurable ranges, 200ksps per channel throughput, and integrated 4.096V reference buffer. It operates from ±15V analog supplies and 5V digital supply, supports CMOS/LVDS serial interfaces, and is rated for –40°C to +125°C operation in industrial and high-reliability power monitoring systems.
For engineers reviewing the LTC2348HLX-18#PBF datasheet, LTC2348HLX-18#PBF pinout, LTC2348HLX-18#PBF application, or LTC2348HLX-18#PBF equivalent, this page delivers verified specifications including per-channel SoftSpan range selection, 96.7dB SNR at 2kHz, 118dB CMRR, ±3LSB INL (±10.24V), rail-to-rail input overdrive tolerance, and guaranteed no missing codes at 18 bits - all critical for precision high-voltage signal acquisition in harsh thermal environments.
Technical Context
The LTC2348HLX-18#PBF implements a true 18-bit successive approximation register architecture with independent per-channel SoftSpan configuration, enabling on-the-fly selection among ±10.24V, 0–10.24V, ±5.12V, and 0–5.12V input ranges without external components. Its wide common-mode input range (VEE to VCC–4V) and 118dB CMRR allow direct digitization of high-common-mode signals in motor drives and power line monitoring.
It features dual serial interface modes: SPI-compatible CMOS I/O (1.8V–5V OVDD) with scalable lane count (1–8 SDOs), and LVDS differential I/O for noise-immune high-speed data transfer. Internal conversion clock eliminates latency, and internal reference buffer (4.096V) supports full-scale accuracy without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees 262,144 distinct output codes with no missing codes across full temperature range. |
| Sampling Rate | 200ksps per channel (8-channel simultaneous sampling) - enables real-time capture of fast transients in multi-phase power systems. |
| INL (Max) | ±3 LSB (±10.24V range) - ensures <0.0073% full-scale linearity error for calibration-critical instrumentation. |
| SNR (Typ) | 96.7 dB (fIN = 2 kHz, ±10.24V range) - delivers >16-bit effective resolution under typical AC conditions. |
| CMRR (Typ) | 118 dB at 200 Hz - rejects common-mode interference from noisy industrial grounds or switching power supplies. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, downhole oil & gas, and industrial PLC environments. |
| Power Dissipation | 140 mW (acquisition mode, 8 channels) - enables thermally constrained designs without forced cooling. |
Pinout & Package
48-lead (7mm × 7mm) LQFP package (LX) with exposed pad for thermal management. Pin functions validated per Linear Technology LTC2348-18 datasheet Rev. FA (2017).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+ | Differential analog input positive | Accepts signals up to VCC–4V; supports true bipolar (IN– = 0V), fully differential (IN– = –IN+), or arbitrary common-mode drive. |
| IN0– to IN7– | Differential analog input negative | Wide common-mode range (VEE to VCC–4V); enables direct connection to isolated amplifiers or shunt-based current sensing. |
| VCC / VEE | Analog supply rails | Supports ±15V operation (–16.5V ≤ VEE ≤ 0V, 0V ≤ VCC ≤ 38V); allows flexible high-voltage front-end interfacing. |
| REFBUF / REFIN | Reference buffer output / input | REFBUF provides 4.096V buffered reference; REFIN accepts 1.25–2.2V external reference or disables internal buffer when grounded. |
| CS / CNV / BUSY / SDO0–SDO7 / SCKI / SCKO | Digital control & serial I/O | Configurable CMOS (1.8–5V OVDD) or LVDS interface; supports 1–8 parallel SDO lanes for throughput optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan configuration | Each of 8 channels independently selects ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V on every conversion - eliminates external gain-switching circuitry. |
| Rail-to-rail input overdrive tolerance | Withstands differential overvoltage up to ±(VCC–VEE) without corruption - protects against transient surges in power electronics. |
| Simultaneous sampling with aperture matching | 150 ps max aperture delay mismatch across all 8 channels - preserves phase coherence for multi-phase voltage/current analysis. |
| Integrated reference buffer | 4.096V low-drift (5 ppm/°C) buffered output capable of driving 8-channel acquisition - removes need for external op-amp buffer. |
| Low-noise, high-SFDR performance | 110 dB spurious-free dynamic range (SFDR) at 2 kHz - resolves small signals buried in harmonics of fundamental waveforms. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
|
Use Scenario: High-density analog input modules acquiring voltage, current, and temperature sensor outputs in modular PLC backplanes. IC Role / Device Role / Timing Role: Simultaneous 8-channel sampling ADC with ±10.24V SoftSpan range selection per channel for mixed-signal fieldbus I/O. Use Value: Eliminates external programmable gain amplifiers and level shifters, reducing BOM count and PCB area while maintaining 18-bit integrity across temperature. |
Use Scenario: Distributed control system (DCS) nodes monitoring pressure, flow, and valve position in chemical plants with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Precision ADC with guaranteed –40°C to +125°C operation and 118dB CMRR for rejecting ground-loop noise in long cable runs. Use Value: Enables single-chip solution for Class A loop-powered transmitters and safety-critical analog input cards without derating or thermal compensation. |
| Power Line Monitoring | Test and Measurement |
|
Use Scenario: Three-phase energy meters and PQ analyzers capturing synchronized voltage/current waveforms under harmonic-rich grid conditions. IC Role / Device Role / Timing Role: Simultaneous 8-channel SAR ADC with 200ksps/channel and 150ps aperture matching for sub-cycle phasor estimation. Use Value: Delivers 96.7dB SNR and 110dB SFDR to resolve 0.1% THD+N distortion in 50/60Hz fundamentals - meeting IEC 61000-4-30 Class A requirements. |
Use Scenario: Modular PXI and LXI data acquisition systems requiring traceable, high-fidelity waveform capture for calibration labs and R&D. IC Role / Device Role / Timing Role: Low-latency, no-missing-codes 18-bit ADC with LVDS output for deterministic timing and EMI-resistant data streaming to FPGA-based processing. Use Value: Supports IEEE 1241-compliant testing with ±3LSB INL and <1.4 LSB RMS transition noise - enabling metrology-grade uncertainty budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 18-bit, 8-channel, ±10V fixed range; no per-channel SoftSpan; uses internal 2.5V ref (not 4.096V); 220ksps max. | Requires external level-shifting for unipolar/bipolar mixing; lower CMRR (105dB); lacks rail-to-rail overdrive tolerance. | Preferred where cost sensitivity outweighs flexibility; suitable for fixed-range industrial DAQ with simpler layout. |
| ADS8688 | 16-bit, 8-channel, ±10.24V range; integrated PGA (±0.25V to ±10.24V); SPI-only CMOS interface; 1MSPS max. | Lower resolution (16-bit); no LVDS option; higher power (350mW); requires external reference for full accuracy. | Chosen when programmable gain is needed for sensor signal conditioning, but 18-bit linearity and thermal stability are not required. |
Compared with AD7606C-18 and ADS8688, the LTC2348HLX-18#PBF uniquely combines per-channel SoftSpan configurability, 118dB CMRR, rail-to-rail overdrive tolerance, and –40°C to +125°C qualification - making it the only option supporting mixed-range, high-CMRR, high-temperature acquisition without external support circuitry.
Availability
LTC2348HLX-18#PBF is available at Aetrix Electronics and suitable for industrial process control, power line monitoring, and test and measurement applications requiring stable component supply, extended temperature reliability, and long-term obsolescence mitigation.
Supply support for LTC2348HLX-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 full product support, datasheets, and application engineering for legacy Linear ICs including the LTC2348 family.
The LTC2348 series was designed specifically for high-accuracy, high-channel-count data acquisition in electrically noisy, thermally demanding environments - targeting industrial automation, energy infrastructure, and precision instrumentation.
FAQ
What is the maximum sampling rate per channel for the LTC2348HLX-18#PBF?
The LTC2348HLX-18#PBF achieves 200ksps per channel when all eight channels are enabled simultaneously. Throughput scales inversely with active channel count: disabling channels increases per-channel rate up to 1000ksps (1 channel). This behavior is governed by fixed total conversion time (tCONV = 450–550 ns × N channels) and cycle time constraints.
Does the LTC2348HLX-18#PBF require an external reference?
No - the LTC2348HLX-18#PBF integrates a precision 4.096V reference buffer (REFBUF) with 5 ppm/°C drift and 13kΩ input impedance. The internal reference can be overdriven via REFIN (1.25–2.2V), or disabled entirely by grounding REFIN, allowing use of external references when tighter tolerance or different voltage is required.
How does the SoftSpan feature work on the LTC2348HLX-18#PBF?
The SoftSpan feature on the LTC2348HLX-18#PBF allows each of the eight input channels to be independently configured on a per-conversion basis for ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V full-scale ranges using dedicated control bits in the command word. This eliminates external gain-switching hardware and enables mixed-range acquisition within a single frame.
What is the operating temperature range of the LTC2348HLX-18#PBF?
The LTC2348HLX-18#PBF is specified for continuous operation from –40°C to +125°C (H-grade), with all key parameters - including ±3LSB INL, 96.7dB SNR, and 118dB CMRR - guaranteed across this full range. This makes it suitable for under-hood automotive, downhole, and high-ambient industrial deployments.
Can the LTC2348HLX-18#PBF interface directly with an FPGA using LVDS?
Yes - the LTC2348HLX-18#PBF supports native LVDS serial I/O with differential SDO/SCKO outputs and SCKI/SDI inputs, compliant with 200–350mV differential swing and 100Ω termination. Timing parameters (e.g., tSKEW = ±0.4ns, tDSDOSCKI = 6ns) are fully characterized for FPGA interfacing at up to 250MHz SCKI rates in LVDS mode.
LTC2348HLX-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:
- -40°C ~ 125°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2348HLX-18#PBF FAQ
1.How can I place an order for LTC2348HLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2348HLX-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 LTC2348HLX-18#PBF reliable?
The price and inventory of LTC2348HLX-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 LTC2348HLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2348HLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2348HLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2348HLX-18#PBF?
LTC2348HLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2348HLX-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 LTC2348HLX-18#PBF?
For technical support, including LTC2348HLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2348HLX-18#PBF requirements.
6.How does Aetrix verify that LTC2348HLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2348HLX-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 LTC2348HLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2348HLX-18#PBF?
All LTC2348HLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2348HLX-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 LTC2348HLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2348HLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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