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Analog Devices Inc. LTC2338IMS-18#PBF
- Part No.:
- LTC2338IMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2338IMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
LTC2338IMS-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 DC accuracy.
For engineers reviewing the LTC2338IMS-18#PBF datasheet, LTC2338IMS-18#PBF pinout, LTC2338IMS-18#PBF application, or LTC2338IMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, daisy-chain SPI interface compatibility across 1.8 V–5 V logic levels, internal conversion clock eliminating external timing constraints, and support for –40°C to +85°C extended industrial temperature range.
Technical Context
The LTC2338IMS-18#PBF implements a charge redistribution SAR architecture with fully differential front-end sampling, achieving zero cycle latency and no pipeline delay. Its input stage uses resistor divider networks (2 kΩ total impedance per input) to attenuate and level-shift ±2.5 × VREFBUF signals into the ADC core's 0–VREFBUF range, enabling true bipolar operation without external signal conditioning.
Conversion is initiated by a rising edge on CNV; an internal oscillator sets tCONV = 460–527 ns. The SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as SDI), with SDO outputting 18-bit two's complement data MSB-first on SCK rising edges. Power management includes automatic nap mode between conversions and dedicated sleep mode (300 µW).
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 minimal latency. |
| Input Range | ±10.24 V true bipolar - supports direct digitization of high-voltage industrial sensor outputs without external gain/level shift. |
| SNR | 100 dB (typ at fIN = 2 kHz) - delivers 16.3 effective bits (ENOB), critical for precision instrumentation and spectral analysis. |
| INL | ±4 LSB (max) - ensures < ±0.0015% full-scale linearity error, essential for calibration-critical process control systems. |
| Reference | 2.048 V internal bandgap (20 ppm/°C max drift) - eliminates need for external reference in cost-sensitive designs while maintaining stability over –40°C to +85°C. |
| Power Dissipation | 50 mW (typ at 1 Msps), 300 µW (sleep mode) - enables thermally constrained portable or multi-channel DAQ systems. |
Pinout & Package
Package: 16-lead plastic MSOP (3 mm × 4.9 mm, 0.5 mm pitch), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Main analog power supply | 5 V ±2.5% supply; powers ADC core and internal 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 resistive divider + 45 pF capacitive load; require low-impedance drive for optimal THD. |
| 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) when REFIN = 0 V. |
| REFIN (Pin 8) | Internal reference output / external reference input | 2.048 V ±5 mV bandgap output; bypassed with 100 nF ceramic; accepts 1.25–2.4 V external reference for enhanced accuracy. |
| CNV (Pin 9) | Convert trigger input | Rising-edge–sensitive; initiates acquisition and conversion; logic levels referenced to OVDD; wakes device from nap/sleep. |
| CHAIN (Pin 10) | Mode selector | Low = normal SPI mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = SDI input for cascaded ADCs). |
| BUSY (Pin 11) | Conversion status indicator | Active-high open-drain output; asserts at CNV↑, deasserts when 18-bit result is ready on SDO; used for timing synchronization. |
| RDL/SDI (Pin 12) | Configurable serial I/O | Function depends on CHAIN state; in chain mode, receives serial data from upstream ADC; supports multi-device SPI busing. |
| SCK (Pin 13) | Serial clock input | Drives data shift-out on SDO; supports up to 100 MHz (10 ns min period); logic levels referenced to OVDD. |
| SDO (Pin 14) | Serial data output | Outputs 18-bit two's complement code MSB-first on SCK rising edges; compatible with 1.8 V–5 V host I/O voltages. |
| OVDD (Pin 15) | Digital I/O supply | 1.71–5.25 V supply for all digital pins (SCK, SDO, BUSY, etc.); enables mixed-voltage system interfacing without level shifters. |
| VDDLBYP (Pin 1) | Internal LDO bypass | 2.5 V regulated output from VDD; must be bypassed with 2.2 µF ceramic capacitor to GND for stable internal biasing. |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar ±10.24 V input range | Enables direct connection to industrial sensors (e.g., strain gauges, RTDs with excitation) without external op-amp level shifting or dual supplies. |
| No missing codes at 18 bits | Guarantees monotonicity across full operating temperature range (–40°C to +85°C), eliminating data gaps in closed-loop control applications. |
| Daisy-chain SPI interface | Allows synchronous sampling of multiple LTC2338IMS-18#PBF devices using a single SCK/SCKCH line, reducing PCB routing complexity in multi-channel systems. |
| Internal 2.048 V reference with 20 ppm/°C max drift | Reduces BOM count and layout area vs. discrete reference solutions while meeting industrial-grade temperature stability requirements. |
| Zero-cycle-latency SAR architecture | Delivers deterministic conversion timing (tCONV = 460–527 ns) and immediate data availability-critical for time-triggered control loops. |
| Automatic nap mode & 300 µW sleep mode | Dynamic power scaling reduces average dissipation in burst-mode acquisition, extending battery life in portable test equipment. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
|
Use Scenario: Digitizing 4–20 mA current loop outputs and ±10 V analog sensor signals (e.g., pressure transmitters, flow meters) in modular PLC I/O modules. IC Role / Device Role / Timing Role: Primary high-resolution ADC handling multiple channel inputs with synchronized sampling via CNV edge triggering. Use Value: ±4 LSB INL and 100 dB SNR ensure accurate representation of small process deviations (< 0.01% FS), supporting tight regulatory compliance in pharmaceutical or chemical plants. |
Use Scenario: High-speed monitoring of reactor temperature, pH, and dissolved oxygen in continuous manufacturing lines with real-time feedback control. IC Role / Device Role / Timing Role: Core data acquisition element in distributed control system (DCS) field instruments, operating continuously at 1 Msps with nap-mode power optimization. Use Value: True bipolar ±10.24 V input range accepts direct connection to thermocouple signal conditioners and isolation amplifiers, eliminating external gain stages and associated errors. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
|
Use Scenario: 32k-point FFT-based spectral analysis of vibration signatures in predictive maintenance systems sampling at 1 Msps. IC Role / Device Role / Timing Role: Precision SAR ADC providing clean, low-jitter digitization for post-processing; internal oscillator removes jitter-sensitive external clock routing. Use Value: 100 dB SNR and –115 dB THD (typ) preserve signal integrity up to 500 kHz, enabling detection of sub-harmonic bearing faults otherwise masked by noise. |
Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring high resolution, low power, and compact form factor. IC Role / Device Role / Timing Role: Main ADC in ultra-low-power acquisition subsystem; sleep mode (300 µW) extends runtime between charges during standby. Use Value: Single 5 V supply and integrated 2.048 V reference reduce system-level power conversion overhead, enabling >8-hour operation on a 2000 mAh Li-ion cell. |
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 |
|---|---|---|---|
| AD7606C-18 (Analog Devices) | 8-channel simultaneous-sampling, ±10 V input, 1 MSPS per channel, internal reference (2.5 V), 100 dB SNR, but requires external REFOUT buffer for full performance. | Designed for multi-channel synchronized acquisition; lacks daisy-chain capability and true single-ended input support without external circuitry. | Select AD7606C-18 when simultaneous sampling across ≥2 channels is required; LTC2338IMS-18#PBF is preferred for single-channel, space-constrained, or daisy-chain–enabled systems. |
| ADS8860 (Texas Instruments) | 16-bit, 1 MSPS, ±5.12 V input, 92 dB SNR, 1.8 V–3.3 V I/O only, no internal reference-requires external 2.5 V reference and buffer. | Lower resolution and narrower input range; optimized for low-voltage, low-power embedded systems rather than industrial high-voltage signal chains. | Choose ADS8860 for cost-sensitive, battery-operated 16-bit applications where ±5.12 V range suffices; LTC2338IMS-18#PBF provides 2 extra bits, wider voltage range, and integrated reference for higher accuracy. |
Compared with AD7606C-18 and ADS8860, the LTC2338IMS-18#PBF uniquely combines 18-bit resolution, ±10.24 V true bipolar input, integrated low-drift reference, and daisy-chain SPI in a single 16-lead MSOP-making it optimal for space-constrained, high-accuracy, single-channel industrial DAQ where board area and BOM count are critical.
Availability
LTC2338IMS-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and high-speed data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2338IMS-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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2338IMS-18#PBF belongs to ADI's precision SAR ADC product line, engineered specifically for industrial automation and test equipment demanding high DC accuracy, wide dynamic range, and robust operation from –40°C to +85°C.
FAQ
What is the maximum operating temperature range for the LTC2338IMS-18#PBF?
The LTC2338IMS-18#PBF is specified for operation from –40°C to +85°C, denoted by the "I" grade in its part number. This extended industrial temperature range ensures reliable performance in harsh environments such as factory floors, outdoor control cabinets, and motor drive enclosures where ambient temperatures exceed commercial limits.
Does the LTC2338IMS-18#PBF require an external reference voltage?
No, the LTC2338IMS-18#PBF includes a factory-trimmed 2.048 V internal bandgap reference and a 2× gain reference buffer, enabling full operation with ±10.24 V input range using only the internal resources. An external reference may be applied to REFIN (1.25–2.4 V) or REFBUF (2.5–5 V) for improved accuracy or drift performance, but it is not required for basic functionality.
How does the daisy-chain mode work on the LTC2338IMS-18#PBF?
Daisy-chain mode is enabled by driving CHAIN (Pin 10) high. In this configuration, RDL/SDI becomes a serial data input, accepting SDO output from a preceding LTC2338IMS-18#PBF in the chain. All devices share one SCK line, and conversion results are shifted out sequentially-reducing SPI bus pin count and simplifying synchronization in multi-ADC systems.
What is the significance of "no cycle latency" in the LTC2338IMS-18#PBF?
"No cycle latency" means the LTC2338IMS-18#PBF delivers the conversion result for a given sample immediately after completion-without pipelining delays typical of sigma-delta or pipeline ADCs. This deterministic timing (tCONV = 460–527 ns) allows precise alignment of sampled data with control events, making the LTC2338IMS-18#PBF ideal for real-time closed-loop systems like servo drives and power converters.
Can the LTC2338IMS-18#PBF interface directly with a 1.8 V microcontroller?
Yes, the LTC2338IMS-18#PBF supports 1.8 V logic levels via its OVDD pin (Pin 15), which powers all digital I/Os (SCK, SDO, BUSY, etc.). When OVDD = 1.8 V, VIH = 1.44 V (min) and VOL = 0.2 V (max) ensure robust interoperability with 1.8 V MCUs without level-shifting circuitry-simplifying design and reducing component count.
LTC2338IMS-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 ~ 85°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2338IMS-18#PBF FAQ
1.How can I place an order for LTC2338IMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2338IMS-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 LTC2338IMS-18#PBF reliable?
The price and inventory of LTC2338IMS-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 LTC2338IMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2338IMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2338IMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2338IMS-18#PBF?
LTC2338IMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2338IMS-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 LTC2338IMS-18#PBF?
For technical support, including LTC2338IMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2338IMS-18#PBF requirements.
6.How does Aetrix verify that LTC2338IMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2338IMS-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 LTC2338IMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2338IMS-18#PBF?
All LTC2338IMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2338IMS-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 LTC2338IMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2338IMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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