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Analog Devices Inc. LTC2335ILX-18#PBF
- Part No.:
- LTC2335ILX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2335ILX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:191
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Product details
Overview
LTC2335ILX-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, 0–10.24V, ±5.12V, 0–5.12V), integrated 4.096V reference buffer, and dual-mode serial interface (CMOS or LVDS). It operates from ±15V analog supplies and 5V digital supply, delivering 96.7dB SNR and ±3 LSB INL over its full industrial temperature range (–40°C to +85°C), targeting high-precision industrial data acquisition systems.
For engineers reviewing the LTC2335ILX-18#PBF datasheet, LTC2335ILX-18#PBF pinout, LTC2335ILX-18#PBF application, or LTC2335ILX-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 18 bits, rail-to-rail input overdrive tolerance, programmable sequencer with zero-latency control, 118 dB CMRR for noisy environments, and support for high-voltage bipolar/unipolar signal conditioning without external level-shifting.
Technical Context
The LTC2335ILX-18#PBF implements a true SAR architecture with no pipeline delay or cycle latency, enabling deterministic timing for real-time control loops. Its SoftSpan™ input flexibility is achieved via on-chip programmable gain and offset calibration per conversion, allowing dynamic range reconfiguration across all eight channels without hardware changes.
Analog inputs feature a wide common mode range (VEE ≤ VCM ≤ VCC – 4 V), 125 dB active crosstalk suppression, and ±10.24 V differential input capability with 7 MHz –3 dB bandwidth. The integrated reference buffer delivers 4.096 V with 5 ppm/°C max drift, while digital I/O supports both 1.8–5 V CMOS and 2.375–5.25 V LVDS interfaces with independent OVDD supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonicity and no missing codes across full operating range. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 500 kHz Nyquist bandwidth. |
| INL (Max) | ±3 LSB (±10.24 V range) - ensures <0.001% absolute accuracy for calibration-critical measurements. |
| SNR (Typ) | 96.7 dB - supports >15.8 effective number of bits (ENOB) in high-dynamic-range applications. |
| CMRR | 118 dB - rejects common-mode noise from motor drives, power line harmonics, or ground loops. |
| Supply Range | VCC = 0–38 V, VEE = –16.5–0 V - accommodates ±15 V, ±12 V, or asymmetric high-voltage rails. |
| Interface | Pin-selectable CMOS (1.8–5 V) or LVDS - allows noise-immune transmission over longer traces or cables. |
| Package | 48-lead LQFP (7 mm × 7 mm) - compatible with standard surface-mount assembly and thermal management. |
Pinout & Package
Package: 48-lead plastic LQFP (7 mm × 7 mm), RoHS-compliant, lead-free finish (#PBF). Thermal resistance θJA = 53°C/W. Designed for soldering to solid ground plane with all GND pins (15, 18, 20, 25, 30, 36, 41, 44, 46) connected directly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+, IN0− to IN7− (Pins 1–2, 3–4, 5–6, 7–8, 9–10, 11–12, 13–14, 47–48) | Differential analog inputs (8 channels) | Accepts true bipolar (IN− = 0 V), fully differential (IN− = –IN+), or arbitrary common-mode drive; supports VCM from VEE to VCC – 4 V. |
| VCC (Pin 16), VEE (Pins 17, 45) | High-voltage analog supplies | VCC = 0–38 V, VEE = –16.5–0 V; differential range ≥10 V; requires local 0.1 µF ceramic bypassing. |
| VDD (Pins 26, 27, 31), VDDLBYP (Pin 32) | Digital core and internal regulator output | VDD = 4.75–5.25 V; VDDLBYP must connect only to 2.2 µF ceramic capacitor to GND - no external loading. |
| REFIN (Pin 19), REFBUF (Pin 21) | Reference input/output | REFIN = 2.048 V bandgap output; REFBUF = 4.096 V buffered reference (2× gain); REFBUF can be overdriven to 2.5–5 V. |
| CS, CNV, BUSY, SCKI, SDI, SDO (Pins 37–43) | Serial interface control/data | CMOS/LVDS mode selected by OVDD voltage; supports SPI-compatible timing with no latency between conversions. |
| PD (Pin 22) | Power-down control | Active-high; reduces current to ≤1 µA in Power Down Mode; wake-up time ≤200 ms when REFBUF enabled. |
Key Features
| Feature | Design Value |
|---|---|
| SoftSpan™ Input Ranging | Per-conversion software-selectable full-scale ranges: ±10.24 V, 0–10.24 V, ±5.12 V, 0–5.12 V - eliminates external gain-switching circuitry. |
| No Missing Codes at 18 Bits | Guaranteed monotonic transfer function across –40°C to +85°C - essential for closed-loop control and metrology. |
| Rail-to-Rail Input Overdrive Tolerance | Withstands differential overvoltage up to ±(VCC – VEE) without damage or latch-up - simplifies front-end protection design. |
| Programmable Sequencer | Automatically cycles through channel/range combinations without CPU intervention - reduces firmware overhead in multi-sensor systems. |
| 118 dB CMRR & 125 dB Crosstalk | Enables simultaneous high-accuracy measurement of multiple high-voltage signals in shared noisy environments (e.g., PLC backplanes). |
| Zero-Latency Conversion Control | No pipeline delay or dead time between conversions - supports deterministic sampling for servo feedback and real-time monitoring. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
|
Use Scenario: High-density analog I/O modules acquiring voltage/current signals from field transmitters, pressure sensors, and thermocouples in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 18-bit digitizer for 8-channel isolated analog inputs; synchronized to system clock via CNV edge; handles ±10.24 V sensor outputs directly. Use Value: Eliminates external signal conditioning for bipolar/unipolar ranges, reducing BOM count and PCB area while maintaining <±3 LSB INL across –40°C to +85°C. |
Use Scenario: Distributed control systems (DCS) measuring flow, level, and temperature in chemical plants with stringent EMC and long-term stability requirements. IC Role / Device Role / Timing Role: Precision ADC in redundant analog input cards; uses LVDS interface for noise immunity over backplane traces; leverages 118 dB CMRR to reject 50/60 Hz interference. Use Value: Delivers 96.7 dB SNR and ±0.025% full-scale error drift (2.5 ppm/°C) - meets SIL-2 functional safety signal chain accuracy targets without recalibration. |
| Power Line Monitoring | Test and Measurement Equipment |
|
Use Scenario: Three-phase energy meters and power quality analyzers capturing voltage and current waveforms at 1 Msps for harmonic analysis up to 50th order. IC Role / Device Role / Timing Role: Simultaneous sampling ADC for voltage and current channels; uses programmable sequencer to alternate between ±10.24 V (voltage) and 0–5.12 V (shunt current) ranges. Use Value: 7 MHz –3 dB input bandwidth and <360 ns settling time enable accurate capture of fast transients (e.g., switching surges) without aliasing or distortion. |
Use Scenario: Benchtop multimeters, data loggers, and automated test equipment requiring traceable 18-bit DC accuracy and low THD (–109 dB) for audio-frequency signal analysis. IC Role / Device Role / Timing Role: Core ADC in calibrated measurement front-end; uses internal 4.096 V reference buffer and 2.048 V bandgap for self-referenced operation. Use Value: ±2 μV/°C zero-scale drift and ±2.5 ppm/°C full-scale drift ensure <10 ppm total error over 40°C ambient swing - meets Class A DMM specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 (Analog Devices) | 8-channel, 18-bit, 1 Msps, but uses external reference; fixed ±10 V range (no SoftSpan); parallel/serial interface only. | Requires external op-amps and reference for bipolar/unipolar flexibility; less suitable for dynamic range reconfiguration. | Select when cost-sensitive designs prioritize pin compatibility with legacy AD7606 layouts and accept fixed input scaling. |
| ADS8688 (Texas Instruments) | 8-channel, 16-bit, 1 Msps, integrated PGA and reference; supports ±10.24 V via internal gain stages; SPI-only interface. | Limited to 16-bit resolution (92 dB SNR typical); lacks LVDS option and 118 dB CMRR; lower power (80 mW). | Select when 16-bit resolution suffices and integrated PGA simplifies anti-aliasing filter design for mixed-signal test equipment. |
Compared with AD7606C-18 and ADS8688, the LTC2335ILX-18#PBF uniquely combines 18-bit no-missing-codes performance, on-the-fly SoftSpan™ range switching, LVDS noise immunity, and 118 dB CMRR - making it optimal for high-voltage industrial DAQ where signal integrity and configurability are non-negotiable.
Availability
LTC2335ILX-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 across extended temperature operation and long product lifecycles.
Supply support for LTC2335ILX-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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2335-18 family was designed specifically for high-accuracy, high-voltage industrial data acquisition - emphasizing robustness in harsh EMI environments, flexible input scaling, and seamless integration into modular I/O systems.
FAQ
What is the maximum operating temperature range for the LTC2335ILX-18#PBF?
The LTC2335ILX-18#PBF is rated for industrial temperature operation from –40°C to +85°C. This grade ('I') is confirmed in the Order Information table and supported by guaranteed specifications across this full range - including ±3 LSB INL, 96.7 dB SNR, and 118 dB CMRR - making it suitable for factory-floor and outdoor control cabinet deployments.
Does the LTC2335ILX-18#PBF require an external reference voltage?
No, the LTC2335ILX-18#PBF includes an integrated 2.048 V bandgap reference (REFIN) and a buffered 4.096 V master reference (REFBUF). REFBUF can be overdriven externally between 2.5 V and 5 V if higher precision or lower drift is required, but operation with the internal reference is fully specified and validated.
How does the SoftSpan™ feature work on the LTC2335ILX-18#PBF?
SoftSpan™ allows per-conversion software configuration of eight input ranges: ±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. This is implemented via internal digital calibration and gain control - no external components or hardware changes are needed to switch ranges across channels or conversions.
Can the LTC2335ILX-18#PBF interface with a 1.8 V microcontroller?
Yes - the LTC2335ILX-18#PBF supports CMOS-level serial I/O with OVDD selectable from 1.71 V to 5.25 V. When OVDD = 1.8 V, VIH = 1.44 V min and VIL = 0.36 V max, ensuring reliable communication with 1.8 V logic without level shifters, while maintaining full 1 Msps throughput.
What is the power dissipation of the LTC2335ILX-18#PBF during active conversion?
In Acquisition Mode at 1 Msps with CMOS I/O, the LTC2335ILX-18#PBF dissipates 182 mW typical (224 mW max). In LVDS mode, it consumes 204 mW typical (248 mW max). Power drops to ≤0.36 mW in Power Down Mode, and Nap Mode reduces it to ~30 mW - enabling thermal management in dense I/O modules.
LTC2335ILX-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2335ILX-18#PBF FAQ
1.How can I place an order for LTC2335ILX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2335ILX-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 LTC2335ILX-18#PBF reliable?
The price and inventory of LTC2335ILX-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 LTC2335ILX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2335ILX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2335ILX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2335ILX-18#PBF?
LTC2335ILX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2335ILX-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 LTC2335ILX-18#PBF?
For technical support, including LTC2335ILX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2335ILX-18#PBF requirements.
6.How does Aetrix verify that LTC2335ILX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2335ILX-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 LTC2335ILX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2335ILX-18#PBF?
All LTC2335ILX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2335ILX-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 LTC2335ILX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2335ILX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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