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Analog Devices Inc. LTC2348ILX-18#PBF
- Part No.:
- LTC2348ILX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2348ILX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,562
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Product details
Overview
LTC2348ILX-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-precision industrial process control and power line monitoring where wide common-mode range and rail-to-rail overdrive tolerance are critical.
For engineers reviewing the LTC2348ILX-18#PBF datasheet, LTC2348ILX-18#PBF pinout, LTC2348ILX-18#PBF application, or LTC2348ILX-18#PBF equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in PLCs and test equipment, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The LTC2348ILX-18#PBF implements a true 18-bit successive approximation register architecture with per-channel programmable SoftSpan ranges (±10.24V, 0–10.24V, ±5.12V, 0–5.12V), enabling dynamic input configuration without hardware changes. Its 118dB CMRR and −109dB THD at 2kHz support direct digitization of high-voltage sensor outputs.
It supports dual serial interfaces: SPI CMOS (1.8V–5V OVDD) with configurable 1–8 data lanes, and LVDS for noise-immune high-speed data transfer. Internal conversion clock eliminates latency, and acquisition time remains stable across all eight channels even at full 200ksps aggregate rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with guaranteed no missing codes - ensures full dynamic range utilization in precision measurement systems. |
| Sampling Rate | 200ksps per channel (8-channel simultaneous sampling) - enables real-time capture of fast transients across multiple sensors. |
| INL | ±3LSB max (±10.24V range) - maintains end-point accuracy for calibration-critical applications like energy metering. |
| SNR | 96.7dB typical (fIN = 2kHz) - delivers >15.7 effective bits for low-noise signal chain design. |
| CMRR | 118dB typical at 200Hz - rejects common-mode interference from motor drives or switching power supplies. |
| Input Range Flexibility | Per-channel SoftSpan: ±10.24V, 0–10.24V, ±5.12V, 0–5.12V - eliminates external gain/level-shifting circuitry per channel. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including factory automation and outdoor substations. |
| Package | 48-lead 7mm × 7mm LQFP - compatible with standard SMT assembly and provides thermal performance up to 125°C junction temperature. |
Pinout & Package
48-lead plastic LQFP (7mm × 7mm, LX package), RoHS-compliant, with exposed pad for thermal management. Pinout validated per Linear Technology LTC2348-18 datasheet Rev. FA (2015).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+ | Differential analog input positive | Accepts signals up to VCC – 4V; supports true bipolar drive (IN– = 0V) or fully differential (IN– = –IN+). |
| IN0– to IN7– | Differential analog input negative | Wide common-mode range (VEE to VCC – 4V); enables arbitrary common-mode biasing. |
| VCC / VEE | Analog supply rails | Supports ±15V operation (VCC = +15V, VEE = –15V); 38V total swing allows high-voltage front-end integration. |
| VDD / OVDD | Digital core & I/O supply | VDD = 5V (core), OVDD = 1.8–5.25V (CMOS) or 2.375–5.25V (LVDS) - enables mixed-voltage system interfacing. |
| REFBUF / REFIN | Reference buffer output / input | REFBUF = 4.096V (typical); REFIN accepts 1.25–2.2V for external reference override. |
| CS / CNV / BUSY / SDOx / SCKO / SCKI / SDI | Digital interface control & data | Configurable SPI CMOS or LVDS; BUSY indicates conversion status; CNV initiates sampling on rising edge. |
| PD | Power-down control | Active-high; reduces current to <1μA in Power Down Mode - essential for low-power wake-up architectures. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan configuration | Independent range selection (±10.24V, 0–10.24V, etc.) per conversion cycle - eliminates multiplexer-induced errors and simplifies multi-sensor signal conditioning. |
| Rail-to-rail input overdrive tolerance | Withstands differential overvoltage up to ±(VCC – VEE) without corruption - protects against transient surges in industrial field wiring. |
| Simultaneous sampling with aperture matching | 150ps max aperture delay mismatch across all 8 channels - preserves phase coherence for power quality analysis and motor current vector control. |
| Integrated reference buffer | 4.096V output with 1.5mA drive capability - powers external circuits while maintaining <±0.025% full-scale error drift. |
| LVDS or CMOS serial interface | Selectable via pin-strapping; LVDS supports >100MHz data rates with 350mV differential swing - ideal for EMI-sensitive environments like medical imaging. |
| Guaranteed operation to 125°C junction | Rated for H-grade (–40°C to +125°C), but I-grade LTC2348ILX-18#PBF maintains full specs to +85°C ambient - suitable for enclosed control cabinets. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog input modules acquiring voltage/current signals from pressure, temperature, and flow sensors across 8 independent channels. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC with per-channel SoftSpan - captures synchronized snapshots of multi-variable process states without time skew. Use Value: Eliminates need for external sample-hold amplifiers and range-switching relays, reducing BOM count and improving long-term calibration stability. | Use Scenario: Closed-loop control systems monitoring reactor temperatures, valve positions, and chemical concentrations in refineries and chemical plants. IC Role / Device Role / Timing Role: Precision digitizer with ±10.24V input and 118dB CMRR - rejects ground-loop noise from 4–20mA transmitters and variable-frequency drives. Use Value: Enables direct connection to industrial sensors without isolation amplifiers, cutting latency and cost while meeting SIL-2 functional safety requirements. |
| Power Line Monitoring | Test and Measurement Equipment |
Use Scenario: Three-phase power analyzers measuring voltage, current, and harmonic distortion on utility distribution panels. IC Role / Device Role / Timing Role: 8-channel simultaneous ADC with 96.7dB SNR and –109dB THD - captures clean waveforms for IEEE 1459-compliant power calculations. Use Value: Achieves Class A accuracy per IEC 61000-4-30 without oversampling or digital filtering, simplifying firmware and reducing MCU load. | Use Scenario: Modular data acquisition systems used in R&D labs for vibration analysis, acoustic testing, and sensor characterization. IC Role / Device Role / Timing Role: Flexible-input ADC supporting ±10.24V, 0–10.24V, and ±5.12V ranges - accommodates diverse sensor outputs (LVDT, strain gauge, thermocouple) within one hardware platform. Use Value: Reduces need for multiple board variants; SoftSpan reconfiguration via software enables rapid test setup changes without hardware modification. |
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 input, 1MSPS aggregate, internal reference, SPI-only interface | Lacks LVDS option and per-channel SoftSpan; requires external level-shifting for 0–10.24V unipolar signals | Preferred when higher aggregate throughput (1MSPS) is needed and LVDS immunity is not required. |
| ADS8688 | 16-bit, 8-channel, ±10.24V input, 1MSPS aggregate, integrated PGA, SPI interface | Lower resolution (16-bit), includes programmable gain amplifier (PGA), no LVDS or simultaneous sampling guarantee | Chosen when signal conditioning (gain/offset adjustment) is needed on-chip and 16-bit resolution suffices for cost-sensitive designs. |
Compared with AD7606C-18 and ADS8688, the LTC2348ILX-18#PBF uniquely combines per-channel SoftSpan flexibility, LVDS noise immunity, and guaranteed simultaneous sampling - making it optimal for applications demanding both precision and configurability across diverse industrial sensor types.
Availability
LTC2348ILX-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, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2348ILX-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 analog IC portfolio, emphasizing precision, reliability, and innovation in data conversion and power management.
The LTC2348 family was designed specifically for industrial and instrumentation applications requiring simultaneous multi-channel sampling, wide input voltage ranges, and robust operation in electrically noisy environments - targeting PLCs, energy meters, and automated test equipment.
FAQ
What is the maximum sampling rate per channel for the LTC2348ILX-18#PBF?
The LTC2348ILX-18#PBF achieves 200ksps per channel when all eight channels are enabled. Throughput increases to 1000ksps per channel when only one channel is active, scaling linearly based on channel count - enabling flexible trade-offs between channel density and speed in real-time systems.
Does the LTC2348ILX-18#PBF require an external reference voltage?
No, the LTC2348ILX-18#PBF includes an integrated 4.096V reference buffer (REFBUF) and internal 2.048V reference (VREFIN). External reference is optional via the REFIN pin (1.25–2.2V range), but the internal reference delivers ±0.025% full-scale error drift and supports all specified performance metrics for the LTC2348ILX-18#PBF.
How does the SoftSpan feature work on the LTC2348ILX-18#PBF?
The SoftSpan feature on the LTC2348ILX-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 ranges using SPI register writes - eliminating hardware switches or external op-amp gain stages and enabling dynamic adaptation to varying sensor output levels within a single acquisition cycle.
What is the operating temperature range of the LTC2348ILX-18#PBF?
The LTC2348ILX-18#PBF is rated for operation from –40°C to +85°C (I-grade), with full electrical specifications guaranteed across this range. Its 48-lead LQFP package and internal thermal design support reliable performance in industrial enclosures, control cabinets, and outdoor substations without forced cooling.
Can the LTC2348ILX-18#PBF interface directly with an FPGA using LVDS?
Yes, the LTC2348ILX-18#PBF supports LVDS serial output with 350mV differential swing and 100Ω termination, compatible with standard FPGA LVDS receivers. Timing parameters (e.g., tSKEW ≤ ±0.4ns, tDSDOSCKI = 6ns) are fully specified for LVDS mode, ensuring deterministic data capture at up to 100MHz clock rates without additional level-shifting circuitry.
LTC2348ILX-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 ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2348ILX-18#PBF FAQ
1.How can I place an order for LTC2348ILX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2348ILX-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 LTC2348ILX-18#PBF reliable?
The price and inventory of LTC2348ILX-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 LTC2348ILX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2348ILX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2348ILX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2348ILX-18#PBF?
LTC2348ILX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2348ILX-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 LTC2348ILX-18#PBF?
For technical support, including LTC2348ILX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2348ILX-18#PBF requirements.
6.How does Aetrix verify that LTC2348ILX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2348ILX-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 LTC2348ILX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2348ILX-18#PBF?
All LTC2348ILX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2348ILX-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 LTC2348ILX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2348ILX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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