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Analog Devices Inc. LTC2338CMS-18#PBF
- Part No.:
- LTC2338CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2338CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:143
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Product details
Overview
LTC2338CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with fully differential, true bipolar ±10.24V inputs, 100 dB SNR (typ), ±4 LSB INL (max), and integrated 2.048 V low-drift reference. It operates from a single 5 V supply and targets high-voltage industrial data acquisition where wide dynamic range and DC accuracy are critical.
For engineers reviewing the LTC2338CMS-18#PBF datasheet, LTC2338CMS-18#PBF pinout, LTC2338CMS-18#PBF application, or LTC2338CMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, daisy-chain SPI interface compatibility across 1.8–5 V logic, internal conversion clock, nap/sleep power management (50 mW / 300 µW), and MSOP-16 packaging for space-constrained high-channel-count systems.
Technical Context
The LTC2338CMS-18#PBF implements a charge-redistribution SAR architecture with a fully differential input stage that attenuates and level-shifts ±10.24 V signals to the ADC core's 0–4.096 V range using internal resistor dividers and a 2× reference buffer. Its internal 2.048 V bandgap reference features ≤20 ppm/°C drift and is factory-trimmed to ±5 mV initial accuracy.
Conversion timing is governed by an internal oscillator (tCONV = 460–527 ns), eliminating external clock dependencies. The SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as SDI), with SDO output in 2's complement format and no pipeline delay or cycle latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 500 kHz Nyquist bandwidth with oversampling flexibility. |
| Input Range | ±10.24 V true bipolar - supports direct digitization of industrial sensor outputs (e.g., ±10 V transducers) without external level-shifting. |
| SNR | 100 dB (typ at fIN = 2 kHz) - delivers 16.3 effective bits, suitable for precision instrumentation requiring sub-100 µV RMS noise floor. |
| INL | ±4 LSB (max) - ensures end-point linearity error ≤ ±0.015% FSR, critical for calibration-critical process control loops. |
| Power Dissipation | 50 mW (typ at 1 Msps) - scales with sample rate via automatic nap mode; drops to 300 µW in sleep mode for intermittent acquisition. |
| Reference | 2.048 V internal bandgap (≤20 ppm/°C drift) - eliminates need for external reference in cost-sensitive designs while maintaining DC stability. |
Pinout & Package
Package: 16-lead plastic MSOP (3 mm × 4.9 mm, 0.5 mm pitch), RoHS-compliant, rated for 0°C to 70°C operating temperature (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Main analog supply | 5 V ±2.5% input; powers ADC core and reference; requires 10 µF ceramic bypass to GND. |
| IN+, IN– (Pins 4, 5) | Differential analog inputs | Accept ±10.24 V true bipolar signal; modeled as 2 kΩ input impedance with 45 pF sampling capacitance. |
| REFBUF (Pin 7) | Reference buffer output | Nominally 4.096 V (2× REFIN); decoupled with 47 µF ceramic capacitor; can be overdriven externally (2.5–5 V). |
| REFIN (Pin 8) | Internal reference output / external reference input | 2.048 V bandgap output (bypassed with 100 nF); accepts 1.25–2.4 V external reference for enhanced accuracy. |
| CNV (Pin 9) | Convert trigger | Rising-edge–initiated conversion start; powers up ADC and defines acquisition window timing. |
| CHAIN (Pin 10) | Interface mode selector | Low = normal mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = serial data input). |
| BUSY (Pin 11) | Conversion status indicator | Active-high open-drain output signaling conversion in progress; synchronized to CNV edge. |
| RDL/SDI (Pin 12) | Mode-dependent serial I/O | In normal mode: controls SDO tri-state; in chain mode: accepts serial data from upstream ADC. |
| SCK (Pin 13) | Serial clock input | Accepts 10 ns min period (100 MHz max); clocks out 18-bit 2's complement data on rising edge. |
| SDO (Pin 14) | Serial data output | MSB-first 2's complement output; valid within 7.5–9.5 ns after SCK↑ depending on OVDD voltage. |
| OVDD (Pin 15) | Digital I/O supply | 1.71–5.25 V logic supply; sets VIH/VIL thresholds; bypassed with 0.1 µF ceramic capacitor. |
| GND (Pins 3, 6, 16) | Analog/digital ground | Three dedicated ground pins minimize ground bounce; require low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar ±10.24 V input range | Enables direct interfacing with industrial ±10 V sensors and PLC analog I/O modules without external op-amp level-shifting circuitry. |
| Onboard 2.048 V reference + 2× buffer | Reduces BOM count and layout area; eliminates external reference IC and associated decoupling, while maintaining ≤20 ppm/°C drift over –40°C to 125°C. |
| No pipeline delay / zero cycle latency | Delivers deterministic conversion timing (tCONV = 460–527 ns) ideal for closed-loop control systems requiring immediate digital feedback. |
| Daisy-chain SPI interface | Allows synchronous readout of multiple LTC2338CMS-18#PBF devices on a single 3-wire bus, reducing FPGA/GPIO resource usage in multi-channel DAQ systems. |
| Automatic nap mode between conversions | Reduces average power proportionally to sample rate-e.g., 500 kSPS operation draws ~25 mW-extending thermal headroom in dense PCB layouts. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
|
Use Scenario: Digitizing ±10 V analog outputs from pressure, temperature, and flow transmitters in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary high-resolution ADC front-end; samples at 1 Msps with deterministic latency to support fast PID loop execution. Use Value: ±4 LSB INL ensures calibrated measurement repeatability across temperature; integrated reference eliminates field recalibration due to reference drift. |
Use Scenario: High-accuracy monitoring of reactor vessel temperatures and chemical concentrations in distributed control systems (DCS). IC Role / Device Role / Timing Role: Precision data acquisition node; uses daisy-chain SPI to aggregate readings from 8+ channels onto one controller interface. Use Value: 100 dB SNR enables detection of sub-millivolt-level sensor anomalies; 125°C-rated variants (H-grade) support deployment near heat sources. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
|
Use Scenario: 32k-point FFT-based spectral analysis in benchtop oscilloscopes and signal analyzers operating up to 500 kHz bandwidth. IC Role / Device Role / Timing Role: Core ADC engine; leverages internal oscillator and no-latency timing for coherent sampling across multiple channels. Use Value: –115 dB THD preserves harmonic integrity for distortion-sensitive measurements; 7 MHz input bandwidth supports anti-alias filtering design. |
Use Scenario: Battery-powered handheld multimeters and portable power quality analyzers requiring high resolution in minimal volume. IC Role / Device Role / Timing Role: Low-power precision ADC subsystem; enters 300 µW sleep mode between manual-triggered acquisitions. Use Value: 50 mW active power enables >8-hour runtime on Li-ion cells; MSOP-16 footprint fits compact 4-layer PCBs with minimal decoupling area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 (Analog Devices) | 8-channel simultaneous-sampling, ±10 V input, 225 kSPS per channel, internal reference (2.5 V), 95.5 dB SNR | Targets multi-channel synchronized acquisition; lower throughput per channel but higher channel density | Select when simultaneous sampling across ≥2 channels is required; avoid if single-channel 1 Msps throughput is mandatory. |
| ADS8860 (Texas Instruments) | 16-bit, 1 Msps, ±5 V unipolar input, external reference only, 92 dB SNR, 12.5 mW power | Lower resolution and unipolar-only; optimized for ultra-low-power portable systems | Select for battery-operated 16-bit applications where ±10.24 V bipolar range and 18-bit linearity are not required. |
Compared with AD7606C-18 and ADS8860, the LTC2338CMS-18#PBF uniquely delivers 18-bit resolution, true bipolar ±10.24 V input, and 1 Msps throughput in a single-channel MSOP package-making it optimal for space-constrained, high-dynamic-range industrial DAQ nodes where per-channel performance outweighs channel count.
Availability
LTC2338CMS-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and high-speed data acquisition equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC2338CMS-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2338-18 product line was developed by Linear Technology to address demanding industrial and instrumentation applications requiring high DC accuracy, wide input voltage range, and low power consumption in compact packages.
FAQ
What is the maximum operating temperature for the LTC2338CMS-18#PBF?
The LTC2338CMS-18#PBF is specified for 0°C to 70°C operation (C-grade). For extended temperature ranges, the LTC2338IMS-18#PBF (–40°C to 85°C) and LTC2338HMS-18#PBF (–40°C to 125°C) are available. All variants share identical electrical specifications and pinout, enabling drop-in replacement with appropriate thermal validation.
Does the LTC2338CMS-18#PBF require an external reference?
No-the LTC2338CMS-18#PBF includes a factory-trimmed 2.048 V internal bandgap reference and a 2× reference buffer, enabling full ±10.24 V operation without external components. REFIN (Pin 8) can be overdriven with 1.25–2.4 V for improved accuracy, and REFBUF (Pin 7) can be overdriven with 2.5–5 V if the internal buffer is disabled.
How does the daisy-chain mode work on the LTC2338CMS-18#PBF?
When CHAIN (Pin 10) is high, the LTC2338CMS-18#PBF enters daisy-chain mode: RDL/SDI becomes SDI (serial data input), accepting data from the SDO of the upstream device. SDO outputs the local conversion result, allowing multiple LTC2338CMS-18#PBF devices to share one SCK and BUSY line while maintaining independent CNV control.
What is the significance of "no cycle latency" in the LTC2338CMS-18#PBF?
"No cycle latency" means the LTC2338CMS-18#PBF delivers the conversion result for a given CNV edge immediately after tCONV, with no additional pipeline stages or buffering delays. This enables deterministic timing for time-critical applications like real-time control, where output data must be available within 527 ns of the convert command.
Can the LTC2338CMS-18#PBF interface with 1.8 V microcontrollers?
Yes-the LTC2338CMS-18#PBF supports 1.8 V, 2.5 V, 3.3 V, and 5 V logic levels via its OVDD (Pin 15) supply. When OVDD = 1.8 V, VIH = 1.44 V and VIL = 0.36 V, ensuring reliable communication with 1.8 V FPGAs and microcontrollers without level shifters.
LTC2338CMS-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- 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:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2338CMS-18#PBF FAQ
1.How can I place an order for LTC2338CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2338CMS-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 LTC2338CMS-18#PBF reliable?
The price and inventory of LTC2338CMS-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 LTC2338CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2338CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2338CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2338CMS-18#PBF?
LTC2338CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2338CMS-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 LTC2338CMS-18#PBF?
For technical support, including LTC2338CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2338CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2338CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2338CMS-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 LTC2338CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2338CMS-18#PBF?
All LTC2338CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2338CMS-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 LTC2338CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2338CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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