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Analog Devices Inc. LTC2378IDE-18#PBF
- Part No.:
- LTC2378IDE-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2378IDE-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:330
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Product details
Overview
LTC2378IDE-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 (VREF = 2.5 V to 5.1 V). It operates from a 2.5 V analog supply and supports 1.8 V–5 V I/O logic, enabling high-precision data acquisition in medical imaging and portable instrumentation.
For engineers reviewing the LTC2378IDE-18#PBF datasheet, LTC2378IDE-18#PBF pinout, LTC2378IDE-18#PBF application, or LTC2378IDE-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, digital gain compression (DGC) for single-supply amplifier interfacing, internal conversion clock, daisy-chain SPI interface, and –40°C to +85°C industrial temperature rating in 4 mm × 3 mm DFN package.
Technical Context
The LTC2378IDE-18#PBF implements a charge-redistribution SAR architecture with a fully differential sampling switch network and 18-bit CDAC. Its conversion timing is governed by an internal oscillator, eliminating external clock dependency and ensuring zero cycle latency at 1 Msps throughput.
Digital Gain Compression (DGC) is implemented via the REF/DGC pin: when grounded, it remaps the full-scale input range from ±VREF to 0.1×VREF to 0.9×VREF, enabling rail-to-rail-compatible driver amplifiers (e.g., LT6350) powered from a single 5.5 V supply while preserving full 18-bit resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - delivers 262,144 distinct output codes with guaranteed no missing codes across full temperature range. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 500 kHz Nyquist bandwidth without pipeline delay. |
| SNR | 102 dB (typ) at fIN = 2 kHz - supports >16.5 effective number of bits (ENOB) for high-fidelity signal digitization. |
| INL | ±1.75 LSB (max) - ensures monotonicity and accurate end-point linearity critical for closed-loop control and calibration systems. |
| Power Dissipation | 13.5 mW at 1 Msps - achieves 13.5 µW/Msps efficiency, scaling linearly with sample rate during auto power-down. |
| Reference Range | 2.5 V to 5.1 V - allows flexible system-level trade-offs between dynamic range, noise floor, and driver supply constraints. |
| Aperture Jitter | 4 ps (rms) - limits sampling uncertainty to <0.02 LSB at 100 kHz input, preserving SFDR >125 dB. |
Pinout & Package
The LTC2378IDE-18#PBF is housed in a 16-lead, 4 mm × 3 mm plastic DFN package with exposed pad (Pin 17) soldered to PCB ground for thermal and EMI performance. Pin count and layout match the MSOP variant, but DFN offers lower θJA (40°C/W vs. 110°C/W) and reduced board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High enables daisy-chain SPI mode; low configures RDL/SDI as bus enable for standalone operation. |
| VDD (2) | Analog supply | 2.5 V ±62.5 mV supply powering core ADC and reference buffer; requires 10 µF ceramic bypass to GND. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±VREF fully differential signal; input capacitance 45 pF in sample mode; common-mode range centered at VREF/2 ±0.1 V. |
| REF (7) | Reference voltage input | 2.5 V–5.1 V external reference; decoupled with 47 µF X5R ceramic capacitor at pin. |
| REF/DGC (8) | Reference/DGC control | Tied to REF disables DGC (full ±VREF range); tied to GND enables DGC (0.1–0.9×VREF range). |
| CNV (9) | Convert trigger | Rising edge initiates conversion and powers up ADC; no minimum pulse width required. |
| BUSY (11) | Conversion status | Active-high open-drain indicator; asserts at CNV↑ and deasserts after tCONV (≤527 ns). |
| RDL/SDI (12) | Serial interface control/data | In normal mode: bus enable; in chain mode: serial data input for daisy-chained configuration. |
| SCK (13) | Serial clock | Supports up to 100 MHz SCK (10 ns period); rising edge clocks out MSB-first 2's complement data on SDO. |
| SDO (14) | Serial data output | Tri-state output; driven only when RDL/SDI = low (normal) or CHAIN = high (chain); outputs 18-bit result. |
| OVDD (15) | I/O supply | 1.71 V–5.25 V digital interface supply; sets logic thresholds (VIH/VIL = 0.8/0.2×OVDD); bypass with 0.1 µF ceramic. |
| GND (3,6,10,16,17) | Ground terminals | Four dedicated GND pins plus exposed pad (Pin 17) - all must connect to low-impedance ground plane for optimal noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Enables single-supply (e.g., +5.5 V) driver amplifiers by compressing full-scale input range to 0.1–0.9×VREF, eliminating need for negative rail while retaining 18-bit resolution. |
| No Cycle Latency | Delivers first valid conversion result exactly one sample period after CNV↑ - essential for deterministic real-time control loops. |
| Internal Conversion Clock | Removes requirement for external timing circuitry; guarantees consistent 460–527 ns conversion time across voltage/temperature. |
| Auto Power-Down | Reduces current to ≤0.9 µA between conversions - cuts average power proportionally to sampling rate (e.g., 13.5 µW at 1 ksps). |
| SPI Daisy-Chain Mode | Allows synchronous readout of multiple LTC2378-18 devices using single SCK/SDO lines - simplifies multi-channel system routing and reduces FPGA I/O count. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
Use Scenario: Digitizing CT/MRI detector channel outputs requiring high dynamic range and low distortion over wide temperature ranges. IC Role / Device Role / Timing Role: Primary 18-bit SAR ADC capturing analog sensor outputs with 102 dB SNR and <4 ps aperture jitter to preserve image fidelity. Use Value: Enables detection of low-contrast anatomical features through superior noise floor and guaranteed monotonicity across –40°C to +85°C operating range. | Use Scenario: Real-time waveform capture in automated test equipment (ATE) for semiconductor parametric testing. IC Role / Device Role / Timing Role: High-throughput digitizer synchronized to precision trigger events with zero-latency conversion and deterministic BUSY timing. Use Value: Eliminates pipeline delay-induced timing skew, allowing sub-microsecond measurement repeatability and tight pass/fail binning accuracy. |
| Portable Instrumentation | Industrial Process Control |
Use Scenario: Battery-powered handheld spectrum analyzers or portable oscilloscopes needing extended runtime and high-resolution signal analysis. IC Role / Device Role / Timing Role: Low-power 18-bit ADC with auto power-down and 13.5 mW active consumption, supporting variable sample rates down to 1 ksps. Use Value: Extends battery life by >1000× versus continuous operation while maintaining full 18-bit ENOB at reduced throughput. | Use Scenario: Precision analog input modules in PLCs monitoring temperature, pressure, and flow sensors in factory automation. IC Role / Device Role / Timing Role: Isolated front-end ADC interfaced via transformer-coupled SPI, leveraging DGC to simplify isolated power design. Use Value: Reduces isolated DC/DC count by enabling single-supply isolated drivers, lowering BOM cost and improving long-term reliability. |
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 uses external reference and lacks DGC; INL ±2.5 LSB max; consumes 23 mW at 1 Msps. | Requires dual-supply driver for full ±VREF range; less suitable for single-supply compact designs. | Select when external reference flexibility and ADI ecosystem compatibility outweigh DGC and lower power needs. |
| ADS8860IPWR | 16-bit, 1 Msps, no DGC, 92 dB SNR, 1.8 V–3.6 V supply; smaller 3 mm × 3 mm WQFN package. | Lower resolution and SNR; optimized for ultra-low-voltage battery systems rather than high-fidelity acquisition. | Select when 16-bit resolution suffices and board space or supply voltage constraints dominate over dynamic range. |
Compared with AD7986BCPZ-RL7 and ADS8860IPWR, the LTC2378IDE-18#PBF uniquely combines 18-bit no-missing-codes assurance, integrated DGC for single-supply driver simplification, and lowest power per Msps (13.5 mW), making it optimal for thermally constrained, high-accuracy industrial and medical platforms.
Availability
LTC2378IDE-18#PBF is available at Aetrix Electronics and suitable for medical imaging systems, high-speed data acquisition equipment, and portable instrumentation requiring stable component supply, extended temperature support (–40°C to +85°C), and guaranteed long-term manufacturability.
Supply support for LTC2378IDE-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 LTC2378-18 series belongs to ADI's precision SAR ADC product line, designed specifically for applications demanding 18-bit resolution, low power, and robust operation across industrial temperature ranges without sacrificing speed or accuracy.
FAQ
What is the operating temperature range for the LTC2378IDE-18#PBF?
The LTC2378IDE-18#PBF is rated for operation from –40°C to +85°C, meeting industrial temperature requirements. This grade is confirmed by its "I" suffix in the part number and is validated across all electrical specifications including INL, SNR, and power consumption per the datasheet's "l" (full-range) markings.
Does the LTC2378IDE-18#PBF require an external clock source?
No, the LTC2378IDE-18#PBF incorporates an internal oscillator that controls conversion timing, eliminating the need for an external clock. This ensures consistent 460–527 ns conversion time and removes timing synchronization complexity in system design.
How does Digital Gain Compression (DGC) function in the LTC2378IDE-18#PBF?
Digital Gain Compression in the LTC2378IDE-18#PBF is enabled by grounding the REF/DGC pin (Pin 8), which digitally remaps the full-scale input range from ±VREF to 0.1×VREF–0.9×VREF. This allows driving amplifiers like the LT6350 to operate from a single +5.5 V supply while preserving full 18-bit resolution and linearity.
What package type is used for the LTC2378IDE-18#PBF?
The LTC2378IDE-18#PBF uses a 16-lead, 4 mm × 3 mm plastic DFN package with exposed thermal pad (Pin 17). This package provides lower thermal resistance (θJA = 40°C/W) than the MSOP variant and requires soldering the exposed pad directly to the PCB ground plane for optimal thermal and EMI performance.
Can the LTC2378IDE-18#PBF interface with 1.8 V logic systems?
Yes, the LTC2378IDE-18#PBF supports 1.8 V–5 V I/O logic levels via its OVDD supply (Pin 15). When OVDD = 1.8 V, VIH and VIL thresholds are set to 1.44 V and 0.36 V respectively, ensuring reliable SPI communication with low-voltage FPGAs and microcontrollers without level-shifting circuitry.
LTC2378IDE-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2378IDE-18#PBF FAQ
1.How can I place an order for LTC2378IDE-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2378IDE-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 LTC2378IDE-18#PBF reliable?
The price and inventory of LTC2378IDE-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 LTC2378IDE-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2378IDE-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2378IDE-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2378IDE-18#PBF?
LTC2378IDE-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2378IDE-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 LTC2378IDE-18#PBF?
For technical support, including LTC2378IDE-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2378IDE-18#PBF requirements.
6.How does Aetrix verify that LTC2378IDE-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2378IDE-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 LTC2378IDE-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2378IDE-18#PBF?
All LTC2378IDE-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2378IDE-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 LTC2378IDE-18#PBF part is unused and in its original packaging.
Return procedure for LTC2378IDE-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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