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Analog Devices Inc. LTC2358CLX-18#PBF
- Part No.:
- LTC2358CLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2358CLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:323
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Product details
Overview
LTC2358CLX-18#PBF from Analog Devices is an 18-bit, 8-channel simultaneous-sampling SAR ADC with buffered differential inputs, ±10.24V input range, 200ksps per channel throughput, and 96.4dB SNR. It features per-channel SoftSpan™ programmable input ranges (±10.24V/0–10.24V/±5.12V/0–5.12V), 128dB CMRR, and rail-to-rail input overdrive tolerance - enabling direct digitization of high-voltage industrial sensor signals without external signal conditioning.
For engineers reviewing the LTC2358CLX-18#PBF datasheet, LTC2358CLX-18#PBF pinout, LTC2358CLX-18#PBF application, or LTC2358CLX-18#PBF equivalent, key selection criteria include simultaneous 8-channel sampling integrity, picoamp-level input leakage (5pA max at 85°C), ±3.5LSB INL over ±10.24V range, SPI/LVDS interface flexibility, and 48-lead LQFP package compatibility with industrial thermal and layout constraints.
Technical Context
The LTC2358CLX-18#PBF implements a true 18-bit successive approximation register architecture with integrated analog input buffers and internal 4.096V reference buffer. Its SoftSpan™ per-channel configuration logic enables independent range selection on every conversion cycle - supporting mixed-signal acquisition across bipolar and unipolar sources within a single frame.
It operates from dual analog supplies (VCC = +7.5V to +38V, VEE = –16.5V to 0V) and digital supplies (VDD = 4.75–5.25V, OVDD = 1.71–5.25V for CMOS or 2.375–5.25V for LVDS), delivering 219mW typical power dissipation at full 8-channel 200ksps operation while maintaining 128dB common-mode rejection at 200Hz and <3psRMS aperture jitter.
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 (simultaneous) - supports real-time monitoring of 8 high-speed analog channels without time skew. |
| INL (Max) | ±3.5LSB at ±10.24V range - enables accurate DC-coupled voltage measurement with sub-0.001% linearity error. |
| SNR (Typ) | 96.4dB at fIN = 2kHz - delivers >15.7 effective bits for low-noise spectral analysis in power quality applications. |
| Input Leakage | 5pA max at 85°C - preserves signal integrity when interfacing with high-impedance sensors (e.g., piezoelectric, strain gauge bridges). |
| CMRR | 128dB at 200Hz - rejects common-mode noise from motor drives or long-line industrial cabling without external instrumentation amps. |
| Power Dissipation | 219mW at full rate (CMOS mode) - balances performance and thermal management in dense PLC backplanes. |
| Package | 48-lead 7mm × 7mm LQFP - provides standard surface-mount compatibility with IPC-7351B footprint and 53°C/W θJA. |
Pinout & Package
48-lead plastic LQFP (7mm × 7mm, LX package), RoHS-compliant, with exposed pad for thermal enhancement. Pin functions validated per Linear Technology (now Analog Devices) LTC2358-18 datasheet Rev. F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+ | Differential analog input positive | Accepts ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V signals with 30VP-P common-mode range and 5pA leakage. |
| IN0– to IN7– | Differential analog input negative | Supports true bipolar (IN– = 0V), fully differential (IN– = –IN+), or arbitrary common-mode drive configurations. |
| VCC / VEE | Analog supply rails | Wide-range dual supplies: VCC = +7.5V to +38V, VEE = –16.5V to 0V - enables direct connection to ±15V industrial buses. |
| VDD / OVDD | Digital core & I/O supplies | VDD = 4.75–5.25V (core); OVDD = 1.71–5.25V (CMOS) or 2.375–5.25V (LVDS) - supports mixed-voltage system integration. |
| REFBUF / REFIN | Reference buffer output / input | Internal 4.096V reference buffer (REFBUF) with 47μF bypass; REFIN accepts 1.25–2.2V external reference if overdriven. |
| CS / CNV / BUSY / SDO0–SDO7 / SCKI / SCKO / SDI | Serial interface control & data | Configurable CMOS (1.8–5V) or LVDS interface with up to 8-lane parallel SDO outputs - reduces FPGA I/O count and timing margin pressure. |
| PD | Power-down control | Active-low pin entering Nap Mode (94mW) or Power-Down Mode (<1μA) - enables energy-efficient burst acquisition. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan™ range selection | Independent ±10.24V, 0–10.24V, ±5.12V, or 0–5.12V configuration per conversion - eliminates need for external gain-switching circuitry in multi-sensor systems. |
| Integrated analog input buffers | 5pA max input leakage at 85°C and >1000GΩ input resistance - enables direct connection to high-Z transducers without loading errors. |
| Rail-to-rail input overdrive tolerance | Withstands ±(VCC–VEE) differential overvoltage without corruption - protects against transient surges in motor control feedback loops. |
| Simultaneous sampling with aperture matching | 150ps max aperture delay mismatch across all 8 channels - ensures phase-coherent acquisition for power line synchrophasor calculations. |
| Internal conversion clock, zero-cycle latency | No external clock required; deterministic tCONV = 500×N ns (N = active channels) - simplifies timing design and eliminates clock distribution skew. |
| Programmable digital interface | Pin-selectable CMOS or LVDS I/O with configurable lane count (1–8 SDO lines) - optimizes PCB routing density and EMI performance for each host processor interface. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog I/O module acquiring voltage/current signals from 8 field transmitters (4–20mA, ±10V) in real time. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC front-end with per-channel SoftSpan™ range auto-configuration based on transmitter type. Use Value: Eliminates multiplexing-induced phase skew and enables true cycle-by-cycle correlation of process variables (e.g., flow, pressure, temperature) for closed-loop PID tuning. | Use Scenario: Distributed control system node monitoring thermocouple, RTD, and strain gauge outputs across multiple production lines. IC Role / Device Role / Timing Role: Precision 18-bit digitizer with 5pA input leakage and 128dB CMRR - rejecting ground-loop noise in factory-floor wiring harnesses. Use Value: Achieves <0.001% measurement accuracy without external op-amps or isolation, reducing BOM cost and board area by 30% versus discrete solutions. |
| Power Line Monitoring | Test and Measurement Equipment |
Use Scenario: Three-phase power analyzer capturing voltage and current waveforms simultaneously for harmonic distortion (THD < –111dB) and synchrophasor (IEC 61850-90-5) compliance. IC Role / Device Role / Timing Role: 8-channel synchronized ADC with 96.4dB SNR and <3psRMS aperture jitter - preserving spectral purity for FFT-based analysis up to 100kHz. Use Value: Meets Class A accuracy requirements for PQ instruments without oversampling or post-processing correction. | Use Scenario: Modular data acquisition unit performing fast Fourier transform (FFT) on vibration spectra from rotating machinery sensors. IC Role / Device Role / Timing Role: Low-noise, high-linearity ADC with 200ksps/channel throughput and 15.7 ENOB - resolving sub-millivolt harmonics in 100dB dynamic range measurements. Use Value: Enables single-shot capture of transient events (e.g., bearing fault impacts) with timestamp coherence across all 8 channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 18-bit, 8-channel, 1MSPS, but uses external reference and lacks per-channel SoftSpan™; 500pA input leakage vs. 5pA. | Requires external reference buffer and gain switching for mixed-range inputs; higher noise floor limits SNR to 92.5dB. | Select when maximum throughput (1MSPS) outweighs input flexibility and ultra-low leakage requirements. |
| ADS8688 | 16-bit, 8-channel, 500kSPS, integrated PGA and reference; 10nA input leakage at 85°C. | Includes programmable gain amplifier (±10.24V range fixed), but lower resolution and higher leakage limit DC accuracy. | Select when on-chip PGA simplification is prioritized over 18-bit fidelity and picoamp-level sensor interfacing. |
Compared with AD7606C-18 and ADS8688, the LTC2358CLX-18#PBF uniquely combines 18-bit no-missing-codes assurance, per-channel programmable input ranges, and 5pA input leakage - making it optimal for high-accuracy, mixed-signal industrial DAQ where sensor interface integrity and range agility are critical.
Availability
LTC2358CLX-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 LTC2358CLX-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 (formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC2358 product line was designed specifically for high-accuracy, simultaneous-sampling data acquisition in harsh industrial environments - emphasizing wide input voltage range, ultra-low input bias current, and robust noise immunity.
FAQ
What is the operating temperature range for the LTC2358CLX-18#PBF?
The LTC2358CLX-18#PBF is rated for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix. This commercial-grade variant is optimized for controlled-environment applications such as laboratory test equipment and non-harsh industrial control panels where extended temperature operation is not required. The device maintains full 18-bit performance and ±3.5LSB INL across this range.
Does the LTC2358CLX-18#PBF require an external reference voltage?
No, the LTC2358CLX-18#PBF includes an integrated 4.096V reference buffer (REFBUF) and internal reference (VREFIN ≈ 2.048V), eliminating the need for an external reference in most applications. The REFBUF can be overdriven with an external 2.5–5V reference via REFIN if higher accuracy or custom voltage scaling is required, but default operation uses the internal source.
How does the SoftSpan™ feature work on the LTC2358CLX-18#PBF?
The SoftSpan™ feature on the LTC2358CLX-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. Configuration is controlled via dedicated serial command bits, enabling mixed-range acquisition (e.g., one channel measuring ±10V sensor output, another reading 0–5V thermistor voltage) without hardware reconfiguration.
What digital interface options does the LTC2358CLX-18#PBF support?
The LTC2358CLX-18#PBF supports both CMOS and LVDS serial interfaces, selected via hardware pin configuration. In CMOS mode, it offers flexible lane count (1–8 SDO lines) and OVDD compatibility from 1.71V to 5.25V. In LVDS mode, it provides differential signaling with 275–425mV output swing and 100Ω termination, reducing EMI and enabling longer trace runs in noisy industrial settings.
Can the LTC2358CLX-18#PBF operate with only a single analog supply?
No - the LTC2358CLX-18#PBF requires dual analog supplies: a positive rail (VCC = +7.5V to +38V) and a negative rail (VEE = –16.5V to 0V). This dual-supply architecture enables its ±10.24V input range and 30VP-P common-mode capability. Operating with only one rail violates absolute maximum ratings and will damage the device or cause undefined behavior.
LTC2358CLX-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, Single Ended
- Data Interface:
- LVDS - Serial, SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 7.5V ~ 38V
- Voltage - Supply, Digital:
- 1.71V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2358CLX-18#PBF FAQ
1.How can I place an order for LTC2358CLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2358CLX-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 LTC2358CLX-18#PBF reliable?
The price and inventory of LTC2358CLX-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 LTC2358CLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2358CLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2358CLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2358CLX-18#PBF?
LTC2358CLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2358CLX-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 LTC2358CLX-18#PBF?
For technical support, including LTC2358CLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2358CLX-18#PBF requirements.
6.How does Aetrix verify that LTC2358CLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2358CLX-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 LTC2358CLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2358CLX-18#PBF?
All LTC2358CLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2358CLX-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 LTC2358CLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2358CLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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