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Analog Devices Inc. LTC2338HMS-18#PBF
- Part No.:
- LTC2338HMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2338HMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,817
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Product details
Overview
LTC2338HMS-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 inputs, ±10.24 V input range, 100 dB SNR (typ), and ±4 LSB INL (max). It operates from a single 5 V supply, integrates a 2.048 V low-drift (20 ppm/°C max) internal reference and reference buffer, and targets high-voltage industrial data acquisition requiring wide dynamic range and precision at 125°C.
For engineers reviewing the LTC2338HMS-18#PBF datasheet, LTC2338HMS-18#PBF pinout, LTC2338HMS-18#PBF application, or LTC2338HMS-18#PBF equivalent, this page delivers verified specifications, thermal-grade packaging context (–40°C to 125°C), SPI-compatible daisy-chain interface details, and real-world ADC role definitions for PLC, ATE, and instrumentation design validation.
Technical Context
The LTC2338HMS-18#PBF implements a charge-redistribution SAR architecture with no pipeline delay or cycle latency, enabling deterministic 1 µs conversion cycles. Its fully differential input stage accepts ±10.24 V signals via internal resistor divider networks (2 kΩ total impedance), level-shifting them to the ADC core's 0–4.096 V range using a 2× reference buffer.
Conversion timing is governed by an internal oscillator; external clocking is not required. The device supports 1.8 V to 5 V I/O logic levels via OVDD, features RDL/SDI dual-function pinning for normal bus-enable or daisy-chain serial input modes, and includes automatic nap mode between conversions to scale power with sampling rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes across full temperature range. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 7 MHz input bandwidth (–3 dB point). |
| INL (Max) | ±4 LSB - ensures ≤0.015% full-scale error in precision measurement systems like process control transmitters. |
| SNR (Typ) | 100 dB at fIN = 2 kHz - supports >16.6 effective number of bits (ENOB) for high-fidelity signal digitization. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive sensors, downhole oil/gas tools, and industrial motor drives. |
| Power (1 Msps) | 50 mW typical - achieved via nap-mode current reduction and internal clocking, eliminating external timing circuitry. |
| Reference | 2.048 V ±0.5% internal bandgap with 20 ppm/°C max drift - eliminates need for external reference in cost-sensitive designs. |
Pinout & Package
Package: 16-lead MSOP (plastic), 3 mm × 4.9 mm, exposed pad, rated for –40°C to +125°C operation (H-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Main analog supply | 5 V ±2.5%; powers ADC core, reference, and internal LDO generating VDDLBYP. |
| IN+, IN– (Pins 4, 5) | Differential analog inputs | Accept ±10.24 V true bipolar signal; input impedance modeled as 2 kΩ resistive divider into 45 pF sampling capacitor. |
| 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 capacitor; accepts 1.25–2.4 V external reference for extended input ranges. |
| CNV (Pin 9) | Convert trigger | Rising edge initiates acquisition and conversion; logic threshold referenced to OVDD, not VDD. |
| CHAIN (Pin 10) | Serial interface mode select | 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; asserts at CNV↑, deasserts when 18-bit result is ready on SDO. |
| RDL/SDI (Pin 12) | Mode-dependent serial I/O | In normal mode: controls SDO tri-state; in chain mode: receives serial data from upstream ADC in daisy chain. |
| SCK (Pin 13) | Serial clock input | Accepts up to 100 MHz clock (10 ns min period); rising edge clocks out MSB-first 2's complement data on SDO. |
| SDO (Pin 14) | Serial data output | Tri-state CMOS output; driven only when RDL = low (normal) or CHAIN = high (chain); outputs 18-bit result after BUSY↓. |
| OVDD (Pin 15) | Digital I/O supply | 1.71–5.25 V; sets logic thresholds for all digital pins (CNV, CHAIN, BUSY, RDL/SDI, SCK, SDO); bypassed with 0.1 µF. |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar ±10.24 V input range | Enables direct digitization of high-voltage industrial sensor outputs (e.g., ±10 V strain gauge bridges) without external level-shifting. |
| No missing codes at 18 bits | Guarantees monotonicity across full operating temperature range, critical for closed-loop control and safety-critical feedback paths. |
| Internal 2.048 V reference + 2× buffer | Reduces BOM count and PCB area; eliminates external reference IC while maintaining <20 ppm/°C drift over –40°C to +125°C. |
| SPI-compatible daisy-chain mode | Allows synchronous sampling of multiple LTC2338HMS-18#PBF devices using one SCK line and shared CNV, simplifying multi-channel DAQ system layout. |
| Automatic nap mode | Reduces average current from 11.2 mA (1 Msps) to ~4.6 mA between conversions, lowering thermal load in dense PCB layouts. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: Digitizing 4–20 mA current loop signals conditioned to ±10 V via precision shunt and op-amp circuitry in modular I/O racks. IC Role / Device Role / Timing Role: Primary high-resolution ADC capturing analog field inputs with deterministic 1 µs sample period and zero-latency readout. Use Value: ±4 LSB INL ensures <0.015% full-scale accuracy across ambient temperature swings in factory-floor cabinets. |
Use Scenario: Monitoring pressure, temperature, and flow transmitters in chemical plant DCS systems where long-term calibration stability is mandated. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with integrated low-drift reference, eliminating external trimming components and reducing recalibration frequency. Use Value: 20 ppm/°C reference drift and guaranteed operation to +125°C maintain measurement integrity inside hot junction boxes near reactors. |
| High-Speed Data Acquisition | Automated Test Equipment |
Use Scenario: Building portable 16-channel DAQ modules for vibration analysis, powered by battery and requiring low idle power. IC Role / Device Role / Timing Role: Low-power SAR ADC with sleep mode (300 µW) and nap mode, synchronized via daisy-chained CNV for phase-coherent multi-channel sampling. Use Value: 100 dB SNR enables resolution of microvolt-level harmonics in FFT-based mechanical fault detection without external amplification noise. |
Use Scenario: Integrating into PXI or LXI-based ATE mainframes performing parametric testing of precision analog ICs at production volumes. IC Role / Device Role / Timing Role: Calibration-grade ADC used in reference measurement paths for verifying DUT output accuracy against NIST-traceable standards. Use Value: Guaranteed no missing codes and ±4 LSB INL allow pass/fail decisions at 18-bit resolution without interpolation or averaging penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 (Analog Devices) | 8-channel simultaneous-sampling, ±10 V input, 1 MSPS per channel, internal reference, but requires external VDRIVE for overrange protection and has higher 105 mW power at full rate. | Better suited for multi-channel synchronized acquisition; less optimal for space-constrained single-channel designs due to larger 64-lead LQFP package. | Select AD7606C-18 when simultaneous sampling across ≥2 channels is mandatory; LTC2338HMS-18#PBF remains preferred for minimal footprint and lowest power per channel. |
| ADS8860 (Texas Instruments) | 16-bit, 1 MSPS, ±5.12 V input range, SPI interface, no internal reference - requires external REF5025 or similar, and lacks daisy-chain mode. | Lower resolution and narrower input range limit use in true bipolar ±10 V systems; suitable only where 16-bit ENOB suffices and board space allows external reference. | Choose ADS8860 only if 16-bit resolution meets system requirements and external reference integration is acceptable; LTC2338HMS-18#PBF provides superior 18-bit fidelity and self-contained reference. |
Compared with AD7606C-18 and ADS8860, the LTC2338HMS-18#PBF uniquely combines 18-bit no-missing-codes performance, integrated ±10.24 V true bipolar scaling, and 16-lead MSOP packaging - delivering highest resolution-per-mm² and lowest component count for single-channel high-voltage precision DAQ.
Availability
LTC2338HMS-18#PBF is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and high-reliability data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2338HMS-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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2338HMS-18#PBF belongs to Linear's precision SAR ADC product line, engineered specifically for high-voltage, high-accuracy industrial measurement applications where thermal stability, low noise, and minimal external component count are critical design constraints.
FAQ
What is the maximum operating temperature rating for the LTC2338HMS-18#PBF?
The LTC2338HMS-18#PBF is rated for continuous operation from –40°C to +125°C, as confirmed by its H-grade temperature marking and qualification testing per manufacturer specifications. This makes it suitable for under-hood automotive, downhole, and high-ambient industrial environments where standard commercial or industrial grade ADCs would fail.
Does the LTC2338HMS-18#PBF require an external reference voltage?
No, the LTC2338HMS-18#PBF does not require an external reference voltage. It integrates a factory-trimmed 2.048 V bandgap reference and a 2× gain reference buffer, delivering a stable 4.096 V reference at REFBUF pin and enabling a ±10.24 V input range. External references are optional for enhanced accuracy or extended input ranges (±6.25 V or ±12.5 V).
How does the daisy-chain mode work on the LTC2338HMS-18#PBF?
In daisy-chain mode (CHAIN pin high), the LTC2338HMS-18#PBF accepts serial data on RDL/SDI and shifts its own 18-bit result out on SDO during the same SCK sequence, allowing multiple devices to share one SPI bus. Each device's BUSY signal must be OR'd to generate a global busy indicator, and CNV must be asserted synchronously across all chained devices for coherent sampling.
What is the power consumption of the LTC2338HMS-18#PBF at 1 Msps?
At 1 Msps sampling rate, the LTC2338HMS-18#PBF consumes 11.2 mA from VDD and 4.6 mA from OVDD, totaling 50 mW typical power dissipation. Between conversions, it automatically enters nap mode (reducing current to ~4.6 mA total), and in sleep mode draws only 300 µW - enabling ultra-low-power standby in battery-operated instrumentation.
Is the LTC2338HMS-18#PBF pin-compatible with other members of the LTC2338 family?
Yes, the LTC2338HMS-18#PBF is pin-compatible with the LTC2338CMS-18#PBF (0°C to 70°C) and LTC2338IMS-18#PBF (–40°C to 85°C), sharing identical 16-lead MSOP packaging, pinout, and electrical interface. Only the temperature grade and associated reliability screening differ - enabling drop-in replacement in existing designs when upgrading to extended temperature operation.
LTC2338HMS-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:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2338HMS-18#PBF FAQ
1.How can I place an order for LTC2338HMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2338HMS-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 LTC2338HMS-18#PBF reliable?
The price and inventory of LTC2338HMS-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 LTC2338HMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2338HMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2338HMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2338HMS-18#PBF?
LTC2338HMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2338HMS-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 LTC2338HMS-18#PBF?
For technical support, including LTC2338HMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2338HMS-18#PBF requirements.
6.How does Aetrix verify that LTC2338HMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2338HMS-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 LTC2338HMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2338HMS-18#PBF?
All LTC2338HMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2338HMS-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 LTC2338HMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2338HMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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