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Analog Devices Inc. LTC2335CLX-18#PBF
- Part No.:
- LTC2335CLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2335CLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:306
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Product details
Overview
LTC2335CLX-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1 Msps, 8-channel differential successive approximation register (SAR) ADC with SoftSpan™ configurable input ranges (±10.24V, 0V–10.24V, ±5.12V, 0V–5.12V), 118 dB CMRR, and integrated 4.096 V reference buffer. It operates from ±15 V analog supplies and 5 V digital supply, targeting high-precision industrial data acquisition in PLCs and power monitoring systems.
For engineers reviewing the LTC2335CLX-18#PBF datasheet, LTC2335CLX-18#PBF pinout, LTC2335CLX-18#PBF application, or LTC2335CLX-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 18 bits, ±3 LSB INL over ±10.24 V range, rail-to-rail input overdrive tolerance, programmable sequencer with no latency, and dual CMOS/LVDS serial interface support.
Technical Context
The LTC2335CLX-18#PBF implements a true SAR architecture with no pipeline delay or cycle latency, enabling deterministic timing for real-time control loops. Its differential inputs accept wide common-mode voltages (VEE to VCC – 4 V), and its SoftSpan configuration allows per-conversion range selection without external hardware reconfiguration.
It features a fully integrated reference chain: internal 2.048 V bandgap (REFIN) buffered to 4.096 V (REFBUF), with 5 ppm/°C max temperature coefficient and 13 kΩ input impedance. The device supports both CMOS (1.8 V–5 V OVDD) and LVDS serial interfaces, with independent timing specifications and dedicated SCKI/SDO/SCKO pins for each mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes across full operating temperature range (0°C to 70°C). |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 500 kHz Nyquist bandwidth with minimal aliasing risk. |
| INL (Max) | ±3 LSB at ±10.24 V range - ensures absolute accuracy within ±0.0076% of full scale for precision calibration-critical applications. |
| SNR (Typ) | 96.7 dB - delivers effective resolution >15.8 ENOB at 2 kHz input, supporting high-fidelity signal reconstruction. |
| CMRR | 118 dB - rejects common-mode noise from long sensor cables or noisy industrial environments without external instrumentation amps. |
| Power Dissipation | 180 mW (typ) in acquisition mode - balances performance and thermal management in dense industrial PCB layouts. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade industrial control cabinets and non-extended-temperature test equipment. |
Pinout & Package
48-lead (7 mm × 7 mm) plastic LQFP package (LX) with exposed pad for thermal dissipation. All GND pins (15, 18, 20, 25, 30, 36, 41, 44, 46) must be soldered to a solid ground plane. VCC (16) and VEE (17, 45) require local 0.1 µF ceramic bypassing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+, IN0− to IN7− | Differential analog inputs (Ch 0–7) | Accept wide common-mode range (VEE to VCC–4 V); digitize (VIN+ – VIN−) per selected SoftSpan range. |
| REFIN | Internal bandgap reference output / REFBUF input | Provides 2.048 V ±5 mV reference; drives internal buffer to generate 4.096 V master reference (VREFBUF). |
| REFBUF | Reference buffer output | Delivers low-impedance 4.096 V ±5 mV (13 kΩ load capability) for stable ADC conversion reference. |
| CNV | Conversion start trigger | Edge-sensitive input; rising edge initiates sampling and conversion sequence with deterministic tCONV ≤ 550 ns. |
| BUSY | Conversion status indicator | Active-high open-drain output signaling ongoing conversion; used for timing synchronization or interrupt generation. |
| CS, SDI, SCKI, SDO, SCKO | Serial interface control/data | Supports pin-selectable CMOS (1.8 V–5 V OVDD) or LVDS modes; SCKO/SDO are output-only; SCKI/SDI bidirectional. |
| PD | Power-down control | Active-high input placing device in <0.36 mW standby; wake-up time <200 ms for REFBUF stabilization. |
Key Features
| Feature | Design Value |
|---|---|
| SoftSpan™ Input Ranges | Eight programmable configurations (±10.24V, 0–10.24V, ±5.12V, 0–5.12V, ±12.5V, 0–12.5V, ±6.25V, 0–6.25V) enable single-ADC support of bipolar/unipolar sensors without external gain switching. |
| No Pipeline Delay | True SAR architecture delivers first valid conversion result within one sample period (1 µs), eliminating latency-induced phase errors in closed-loop control. |
| Rail-to-Rail Input Overdrive Tolerance | Withstands analog input transients up to (VCC − VEE) without latch-up or damage, simplifying front-end protection design in harsh industrial settings. |
| Programmable Sequencer | Automatically cycles through user-defined channel/range combinations without host intervention, reducing CPU overhead in multi-sensor monitoring. |
| 125 dB Active Crosstalk | Minimizes inter-channel interference during simultaneous high-amplitude signal acquisition, critical for accurate phase measurement in power line monitoring. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density I/O modules acquiring analog sensor data (pressure, temperature, flow) from field transmitters in factory automation. IC Role / Device Role / Timing Role: Primary 18-bit ADC digitizing multiple 4–20 mA loop outputs or ±10 V industrial standards with SoftSpan auto-ranging per channel. Use Value: Eliminates external signal conditioning for mixed-range sensors, reducing BOM count and board area while maintaining ±3 LSB INL accuracy across temperature. | Use Scenario: Distributed control system (DCS) nodes performing real-time feedback control of valves, pumps, and actuators using analog feedback signals. IC Role / Device Role / Timing Role: Low-latency SAR ADC providing deterministic 1 µs conversion timing for PID loop execution at sub-millisecond intervals. Use Value: No pipeline delay ensures immediate availability of sampled values, enabling tighter control bandwidth and improved system stability. |
| Power Line Monitoring | Test and Measurement Equipment |
Use Scenario: Three-phase energy meters and power quality analyzers capturing voltage/current waveforms at 1 Msps for harmonic analysis and fault detection. IC Role / Device Role / Timing Role: Differential ADC with 118 dB CMRR rejecting common-mode noise from grid-connected inverters and switching loads. Use Value: Accurate 96.7 dB SNR enables precise THD measurement down to –109 dB and SFDR >110 dB for compliance with IEC 61000-4-30 Class A. | Use Scenario: Benchtop oscilloscopes and automated test equipment requiring high-resolution waveform capture with flexible input scaling. IC Role / Device Role / Timing Role: Configurable 8-channel ADC supporting variable full-scale ranges via SoftSpan, enabling single-instrument support of diverse DUT signal levels. Use Value: Reduces need for external attenuators/amplifiers; ±10.24 V and 0–10.24 V ranges cover standard test signal amplitudes with 18-bit fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IRGET | 16-bit, 1 Msps, 1-channel, SPI-only, no integrated reference buffer, 92 dB SNR, ±2.5 V input range only | Limited to unipolar signals; requires external reference and signal conditioning for ±10 V inputs | Select when lower resolution suffices and board space constraints favor smaller QFN package (3 mm × 3 mm). |
| AD7606C-18BSTZ | 18-bit, 1 Msps, 8-channel, simultaneous sampling, on-chip PGA, ±10 V fixed range, parallel + SPI interface | Fixed input range (no SoftSpan); higher power (220 mW); includes PGA for sensor-level signals | Choose for applications needing synchronized multi-channel capture (e.g., motor phase current/voltage) where SoftSpan flexibility is secondary to timing coherence. |
Compared with ADS8860IRGET and AD7606C-18BSTZ, the LTC2335CLX-18#PBF uniquely combines per-conversion SoftSpan configurability, integrated 4.096 V reference buffer, and ultra-high CMRR in a single 48-lead LQFP-enabling compact, high-accuracy industrial DAQ designs without external support circuitry.
Availability
LTC2335CLX-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 and long-term production continuity.
Supply support for LTC2335CLX-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.
The LTC2335-18 product line was designed for high-voltage, high-accuracy industrial data acquisition-emphasizing robustness against EMI, wide input dynamic range, and seamless integration into PLC and energy meter platforms.
FAQ
What is the maximum sampling rate supported by the LTC2335CLX-18#PBF?
The LTC2335CLX-18#PBF supports a maximum sampling rate of 1 Msps (1 million samples per second), with a minimum conversion time of 450 ns and guaranteed operation up to 1 µs cycle time across its full 0°C to 70°C operating temperature range. This enables real-time capture of signals with bandwidths up to 500 kHz under Nyquist criteria.
Does the LTC2335CLX-18#PBF require an external reference voltage?
No, the LTC2335CLX-18#PBF does not require an external reference voltage. It integrates a precision 2.048 V bandgap reference (REFIN) and a low-drift 4.096 V reference buffer (REFBUF) with 5 ppm/°C max temperature coefficient. REFBUF can be overdriven externally if needed, but internal operation is self-contained and fully specified.
What are the supported digital interface modes for the LTC2335CLX-18#PBF?
The LTC2335CLX-18#PBF supports two pin-selectable digital interface modes: CMOS (with OVDD ranging from 1.71 V to 5.25 V) and LVDS (with OVDD from 2.375 V to 5.25 V). Interface selection is determined by OVDD voltage level and internal logic; no configuration register write is required to switch between modes.
How does the SoftSpan feature work on the LTC2335CLX-18#PBF?
The SoftSpan feature on the LTC2335CLX-18#PBF allows per-conversion selection of eight input ranges-including ±10.24 V, 0–10.24 V, ±5.12 V, 0–5.12 V, ±12.5 V, 0–12.5 V, ±6.25 V, and 0–6.25 V-via SPI command before each conversion or through a pre-programmed sequencer. This eliminates external gain-switching circuitry and enables mixed-signal acquisition on a single ADC.
What is the operating temperature range for the LTC2335CLX-18#PBF?
The LTC2335CLX-18#PBF is rated for an operating temperature range of 0°C to 70°C (Commercial grade), as indicated by the "C" suffix in the part number. This qualification covers all electrical specifications including ±3 LSB INL, 96.7 dB SNR, and 118 dB CMRR across the full range, making it suitable for industrial control cabinets and laboratory equipment.
LTC2335CLX-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):
- 1M
- Number of Inputs:
- 8
- Input Type:
- Differential
- Data Interface:
- LVDS - Serial, SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2335CLX-18#PBF FAQ
1.How can I place an order for LTC2335CLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2335CLX-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 LTC2335CLX-18#PBF reliable?
The price and inventory of LTC2335CLX-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 LTC2335CLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2335CLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2335CLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2335CLX-18#PBF?
LTC2335CLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2335CLX-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 LTC2335CLX-18#PBF?
For technical support, including LTC2335CLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2335CLX-18#PBF requirements.
6.How does Aetrix verify that LTC2335CLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2335CLX-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 LTC2335CLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2335CLX-18#PBF?
All LTC2335CLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2335CLX-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 LTC2335CLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2335CLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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