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Analog Devices Inc. LTC2378CMS-18#PBF
- Part No.:
- LTC2378CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2378CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,128
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Product details
Overview
LTC2378CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with ±1.75 LSB INL max, 102 dB SNR at 2 kHz, and fully differential ±VREF input range (2.5 V to 5.1 V). It operates from a single 2.5 V supply, consumes 13.5 mW at full speed, and features digital gain compression (DGC) for single-supply amplifier interfacing - used in high-speed medical imaging and portable instrumentation.
For engineers reviewing the LTC2378CMS-18#PBF datasheet, LTC2378CMS-18#PBF pinout, LTC2378CMS-18#PBF application, or LTC2378CMS-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes operation, internal conversion clock eliminating external timing constraints, daisy-chain SPI interface compatibility across 1.8 V–5 V logic, and validated performance to 125°C in MSOP package.
Technical Context
The LTC2378CMS-18#PBF implements a charge-redistribution SAR architecture with a differential comparator and 18-bit CDAC, achieving zero-cycle latency and no pipeline delay. Its conversion is initiated by a CNV rising edge, with internal oscillator setting tCONV = 460–527 ns and tCYC = 1 µs at 1 Msps.
Digital gain compression (DGC) is controlled via the REF/DGC pin: grounded enables 0.1×VREF to 0.9×VREF full-scale mapping (e.g., 0.5 V–4.5 V for 5 V reference), preserving 18-bit resolution while allowing single 5.5 V supply operation for driving amplifiers. The SPI-compatible serial interface supports both normal and daisy-chain modes with SDO, SCK, RDL/SDI, and BUSY signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - delivers 262,144 distinct output codes with guaranteed no missing codes. |
| Sampling Rate | 1 Msps - supports real-time acquisition of signals up to 500 kHz Nyquist bandwidth. |
| SNR | 102 dB (typ, fIN = 2 kHz, VREF = 5 V) - enables >16.6 effective number of bits (ENOB) in precision measurement. |
| INL | ±1.75 LSB (max) - ensures monotonicity and accurate end-point linearity for calibration-critical systems. |
| Power Consumption | 13.5 mW at 1 Msps - scales down to 13.5 µW at 1 ksps via auto power-down between conversions. |
| Input Range | ±VREF, VREF = 2.5 V to 5.1 V - supports flexible signal conditioning with fully differential analog inputs (IN+, IN–). |
| Digital Interface | SPI-compatible with 1.8 V–5 V OVDD - enables direct connection to FPGAs, microcontrollers, and DSPs without level shifters. |
Pinout & Package
Package: 16-lead plastic MSOP (LTC2378CMS-18#PBF), 3 mm × 4.9 mm, exposed pad not present (DFN variant has exposed GND pad; MSOP does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | Low = normal mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = serial data input). |
| VDD (2) | Analog supply | 2.5 V ±62.5 mV supply for core ADC circuitry; bypass with 10 µF ceramic capacitor. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and improve noise immunity in high-speed sampling. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±VREF fully differential signal; input capacitance = 45 pF (sample mode), RON ≈ 40 Ω. |
| REF (7) | Reference voltage input | 2.5 V–5.1 V external reference; decouple with 47 µF X5R ceramic capacitor at pin. |
| REF/DGC (8) | DGC control / reference bias | Tied to GND enables DGC (0.1–0.9×VREF range); tied to REF disables DGC (full ±VREF range). |
| CNV (9) | Convert trigger | Rising edge initiates acquisition and conversion; powers up ADC from auto power-down state. |
| BUSY (11) | Conversion status indicator | High during conversion; falls low when 18-bit result is ready on SDO; used for timing synchronization. |
| RDL/SDI (12) | Serial interface control/data | Function depends on CHAIN state; in chain mode, accepts serial data from upstream ADC in daisy chain. |
| SCK (13) | Serial clock input | Drives data shift-out on SDO; supports up to 100 MHz clock (tSCK ≤ 10 ns); logic levels referenced to OVDD. |
| SDO (14) | Serial data output | 2's complement 18-bit result shifted MSB-first on SCK rising edges; tri-state when RDL = low (normal mode). |
| OVDD (15) | Digital I/O supply | 1.71 V–5.25 V supply for all digital pins; sets VIH/VIL thresholds and drives SDO output swing. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Enables 0.5 V–4.5 V input range with 5 V reference, eliminating need for negative supply in driver amplifiers like LT6350. |
| No Pipeline Delay / Zero Cycle Latency | First conversion result available after one full cycle (1 µs), enabling deterministic real-time control loop timing. |
| Internal Conversion Clock | Removes requirement for external clock source or precise timing coordination - simplifies PCB layout and system integration. |
| Auto Power-Down Between Conversions | Reduces average power proportionally to sampling rate - e.g., 13.5 µW at 1 ksps - critical for battery-powered instruments. |
| Guaranteed Operation to 125°C | H-grade thermal specification validated across full temperature range, supporting industrial and downhole applications. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
Use Scenario: Digitizing ultrasound echo signals in portable handheld scanners requiring high dynamic range and low power. IC Role / Device Role / Timing Role: Primary 18-bit digitizer capturing baseband RF echoes at ≥1 Msps with <1.75 LSB INL for accurate tissue contrast mapping. Use Value: 102 dB SNR enables detection of weak echo returns amid noise floor; DGC allows single-supply front-end design reducing BOM count and board area. | Use Scenario: Real-time waveform capture in automated test equipment (ATE) for semiconductor characterization. IC Role / Device Role / Timing Role: High-fidelity sampling engine synchronized to pattern generator clocks with zero-latency response for stimulus-response analysis. Use Value: No missing codes and ±1.75 LSB INL ensure traceable metrology-grade measurements; SPI daisy-chain supports multi-channel parallel capture. |
| Portable Instrumentation | Industrial Process Control |
Use Scenario: Battery-powered oscilloscope modules measuring sensor outputs in field-deployed environmental monitors. IC Role / Device Role / Timing Role: Low-power SAR ADC converting differential sensor bridges or transducer outputs with minimal thermal drift. Use Value: 13.5 mW at 1 Msps and auto power-down extend runtime; 125°C rating supports operation near hot industrial enclosures. | Use Scenario: Precision analog input module in PLC backplane handling 4–20 mA loop signals and thermocouple inputs. IC Role / Device Role / Timing Role: Isolated, high-accuracy ADC channel providing calibrated 18-bit readings for closed-loop feedback control. Use Value: Fully differential input rejects common-mode noise from motor drives; CMRR >86 dB at 500 kHz suppresses EMI in factory environments. |
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 |
|---|---|---|---|
| AD7986BCPZ-RL7 | 18-bit, 1 Msps, but requires external reference and separate VDRIVE; no DGC; 100 dB SNR (typ). | Needs external op-amp and reference buffer for bipolar input; less integrated for single-supply front ends. | Select when external reference control is preferred and DGC is unnecessary; verify layout for higher THD sensitivity. |
| ADS8860IDRCT | 16-bit, 1 Msps, SPI interface, 92.5 dB SNR (typ); lower power (3.5 mW), no DGC, smaller 3 mm × 3 mm WSON package. | Lower resolution and SNR limit use in metrology; better suited for cost-sensitive, size-constrained embedded monitoring. | Select when 16-bit resolution suffices and PCB area is constrained; not suitable for ENOB >16.5 applications. |
Compared with AD7986BCPZ-RL7 and ADS8860IDRCT, the LTC2378CMS-18#PBF uniquely integrates DGC, internal clock, and guaranteed 18-bit linearity - making it optimal for compact, single-supply, high-fidelity acquisition where reference flexibility and thermal robustness are critical.
Availability
LTC2378CMS-18#PBF is available at Aetrix Electronics and suitable for medical imaging, high-speed data acquisition, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.
Supply support for LTC2378CMS-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 acquired Linear Technology in 2017 and maintains its precision analog product lines with rigorous qualification and long-term support.
The LTC2378CMS-18#PBF belongs to Linear's high-performance SAR ADC family, designed specifically for applications demanding 18-bit accuracy, low power, and seamless integration with single-supply signal chains - especially in portable, industrial, and medical systems.
FAQ
What is the maximum operating temperature for the LTC2378CMS-18#PBF?
The LTC2378CMS-18#PBF is rated for 0°C to 70°C operation (C-grade). For extended temperature ranges, the LTC2378HMS-18#PBF variant supports –40°C to 125°C. Always consult the specific device marking and ordering code - LTC2378CMS-18#PBF itself is not qualified beyond 70°C.
Does the LTC2378CMS-18#PBF require an external clock source?
No. The LTC2378CMS-18#PBF includes an internal oscillator that sets conversion timing, eliminating the need for an external clock. This simplifies system design and reduces jitter sensitivity - the internal clock ensures consistent tCONV = 460–527 ns across temperature and supply variations.
How does Digital Gain Compression (DGC) affect the input range of the LTC2378CMS-18#PBF?
When the REF/DGC pin is grounded, DGC maps the full-scale input range from ±VREF to 0.1×VREF to 0.9×VREF - e.g., 0.5 V to 4.5 V for VREF = 5 V. This preserves full 18-bit resolution while enabling single-supply amplifier operation, as confirmed in the LTC2378-18 datasheet Figure 8 and Applications section.
Is the LTC2378CMS-18#PBF pin-compatible with other variants in the LTC2378 family?
Yes - all LTC2378-x variants (e.g., LTC2378IMS-18#PBF, LTC2378HMS-18#PBF) share identical 16-lead MSOP pinouts and electrical behavior. Only temperature grade and screening differ; no PCB redesign is needed when upgrading from C-grade to I- or H-grade versions.
What decoupling capacitors are required for stable operation of the LTC2378CMS-18#PBF?
The LTC2378CMS-18#PBF requires a 10 µF ceramic capacitor (X5R, 0805) from VDD to GND, a 47 µF ceramic capacitor (X5R, 0805) from REF to GND, and a 0.1 µF capacitor from OVDD to GND. These values are specified in the Pin Functions section and Typical Application schematic (Figure TA01a) of the official datasheet.
LTC2378CMS-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
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2378CMS-18#PBF FAQ
1.How can I place an order for LTC2378CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2378CMS-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 LTC2378CMS-18#PBF reliable?
The price and inventory of LTC2378CMS-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 LTC2378CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2378CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2378CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2378CMS-18#PBF?
LTC2378CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2378CMS-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 LTC2378CMS-18#PBF?
For technical support, including LTC2378CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2378CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2378CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2378CMS-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 LTC2378CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2378CMS-18#PBF?
All LTC2378CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2378CMS-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 LTC2378CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2378CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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