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Analog Devices Inc. LTC2378CDE-18#PBF
- Part No.:
- LTC2378CDE-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2378CDE-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:177
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Product details
Overview
LTC2378CDE-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 data acquisition and medical imaging systems.
For engineers reviewing the LTC2378CDE-18#PBF datasheet, LTC2378CDE-18#PBF pinout, LTC2378CDE-18#PBF application, or LTC2378CDE-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes performance, daisy-chain SPI interface compatibility, internal conversion clock, 4 mm × 3 mm DFN package with exposed pad, and operation across 0°C to 70°C.
Technical Context
The LTC2378CDE-18#PBF implements a charge-redistribution SAR architecture with a 18-bit CDAC and differential comparator, achieving zero-cycle latency and no pipeline delay. Its internal oscillator eliminates external clock dependency, while auto power-down between conversions scales dissipation with sampling rate.
Digital gain compression (DGC) maps the full-scale input range from ±VREF to 0.1×VREF to 0.9×VREF, enabling rail-to-rail single-supply driver operation without resolution loss. The device supports 1.8 V–5 V I/O logic levels via separate OVDD supply and offers daisy-chain mode via CHAIN/RDL/SDI pin reconfiguration.
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 - enables real-time capture of signals up to 500 kHz Nyquist bandwidth. |
| SNR | 102 dB (typ, fIN = 2 kHz, VREF = 5 V) - supports >16.6 effective bits under typical conditions. |
| INL | ±1.75 LSB (max) - ensures monotonicity and precision in measurement-critical applications. |
| Power Consumption | 13.5 mW at 1 Msps - low enough for portable instrumentation and thermally constrained PCBs. |
| Reference Range | 2.5 V to 5.1 V - allows flexible system-level scaling and compatibility with common reference ICs. |
| Digital Interface | SPI-compatible with daisy-chain mode - simplifies multi-channel ADC synchronization without FPGA logic overhead. |
Pinout & Package
Package: 16-lead (4 mm × 3 mm) plastic DFN with exposed thermal pad (Pin 17), rated for 0°C to 70°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CHAIN) | Chain Mode Selector | High enables daisy-chain serial input (RDL/SDI becomes SDI); low enables bus-enable mode for SDO control. |
| Pin 2 (VDD) | Analog Core Supply | 2.375 V–2.625 V supply for ADC core; requires 10 µF ceramic bypass to GND. |
| Pins 3, 6, 10, 16 (GND) | Ground Reference | Four dedicated ground pins minimize ground bounce and improve noise immunity in high-speed sampling. |
| Pins 4, 5 (IN+, IN–) | Differential Analog Inputs | Accept ±VREF fully differential signal; input capacitance 45 pF (sample mode), RON ≈ 40 Ω. |
| Pin 7 (REF) | Reference Input | 2.5 V–5.1 V external reference; decoupled with 47 µF X5R capacitor (0805 size). |
| Pin 8 (REF/DGC) | Reference/Digital Gain Compression Control | Tied to REF → DGC disabled (±VREF range); tied to GND → DGC enabled (0.1–0.9×VREF range). |
| Pin 9 (CNV) | Convert Trigger | Rising edge initiates conversion and powers up ADC; no external timing circuitry required. |
| Pin 11 (BUSY) | Conversion Status Indicator | Active-high open-drain output signaling conversion progress; synchronous with CNV timing. |
| Pin 12 (RDL/SDI) | Serial Bus Enable / Data Input | Function depends on CHAIN state; enables SDO tri-state or accepts daisy-chain data. |
| Pin 13 (SCK) | Serial Clock Input | Supports up to 100 MHz SCK (10 ns period); defines data capture edge for SDO output. |
| Pin 14 (SDO) | Serial Data Output | 2's complement 18-bit result shifted MSB-first; compatible with 1.8 V–5 V host logic levels. |
| Pin 15 (OVDD) | I/O Interface Supply | 1.71 V–5.25 V digital I/O supply; independent of VDD, enabling mixed-voltage system interfacing. |
| Pin 17 (Exposed Pad) | Thermal & Electrical Ground | Must be soldered to PCB ground plane; critical for thermal dissipation (θJA = 40°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Enables single-supply (e.g., +5.5 V) amplifier driving by compressing input range to 0.5 V–4.5 V at 5 V reference - eliminates need for negative rail without resolution loss. |
| No Pipeline Delay / Zero Cycle Latency | Immediate availability of conversion result after BUSY deassertion - essential for closed-loop control and real-time triggering. |
| Internal Conversion Clock | Removes dependency on external timing components; simplifies layout and improves jitter immunity in noisy environments. |
| Auto Power-Down Between Conversions | Reduces average power to 13.5 µW at 1 ksps - extends battery life in portable instrumentation without firmware intervention. |
| 1.8 V–5 V I/O Compatibility | Separate OVDD supply allows direct interfacing with microcontrollers, FPGAs, or ASICs operating at diverse logic voltages. |
| Guaranteed Operation to 70°C | Validated performance across commercial temperature range - suitable for industrial enclosures and non-temperature-controlled environments. |
Applications
| Medical Imaging Signal Chain | High-Speed Industrial DAQ |
|---|---|
|
Use Scenario: Digitizing low-noise CT or MRI sensor outputs requiring high dynamic range and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary 18-bit SAR ADC capturing analog front-end signals with 102 dB SNR and –124 dB THD at 2 kHz. Use Value: Preserves diagnostic fidelity through guaranteed no-missing-codes performance and low aperture jitter (4 ps). |
Use Scenario: Real-time monitoring of motor phase currents, vibration spectra, or power quality waveforms in factory automation systems. IC Role / Device Role / Timing Role: High-throughput ADC synchronized across multiple channels using daisy-chain SPI mode. Use Value: Enables deterministic 1 µs inter-sample timing and eliminates FIFO buffering complexity in PLC-based controllers. |
| Portable Precision Instrumentation | Battery-Powered Test Equipment |
|
Use Scenario: Handheld spectrum analyzers or portable oscilloscopes where size, power, and AC performance are tightly coupled. IC Role / Device Role / Timing Role: Low-power 18-bit ADC operating from single-cell Li-ion (3.0–4.2 V) with regulated 2.5 V VDD and 3.3 V OVDD. Use Value: Delivers 13.5 mW active power and 0.9 µA shutdown current - extends runtime without sacrificing ENOB. |
Use Scenario: Field-deployable calibration tools requiring traceable DC accuracy and AC linearity over temperature. IC Role / Device Role / Timing Role: Metrology-grade ADC with ±1.75 LSB INL max and <0.5 LSB DNL across 0°C–70°C. Use Value: Eliminates post-calibration software correction for offset/gain drift, reducing firmware validation burden. |
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 |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, 1.8 V/5 V dual-supply interface; no DGC; requires external reference buffer; higher power (43 mW). | Higher throughput needed; system already uses external reference ICs and has thermal headroom. | Select when >1 Msps sampling is mandatory and DGC is unnecessary; verify layout for 5 Msps timing closure. |
| ADS8860IDRCT | 16-bit, 1 Msps, 2.5 V supply only; SPI-only (no daisy-chain); lower SNR (92.5 dB); smaller 3 mm × 3 mm WSON. | Cost-sensitive, lower-precision applications where 16-bit resolution suffices and board space is critical. | Choose for compact, lower-cost designs accepting 2-bit resolution trade-off and no DGC requirement. |
Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2378CDE-18#PBF uniquely balances 18-bit integrity, integrated DGC for simplified analog front-end design, and ultra-low 13.5 mW power - making it optimal for portable, precision, and thermally constrained 1 Msps systems.
Availability
LTC2378CDE-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, high-speed industrial data acquisition, and portable precision instrumentation requiring stable component supply and long-term production continuity.
Supply support for LTC2378CDE-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 family was designed by Linear Technology (acquired by ADI in 2017) to deliver metrology-grade AC performance with low power and simplified system integration - targeting applications demanding 18-bit accuracy without complex clocking or power supply schemes.
FAQ
What is the operating temperature range for the LTC2378CDE-18#PBF?
The LTC2378CDE-18#PBF is specified for 0°C to 70°C operation, matching the "C" grade designation. This commercial temperature range is validated across all key parameters including INL, SNR, and power consumption - making it suitable for indoor industrial equipment and portable test instruments without active thermal management.
Does the LTC2378CDE-18#PBF require an external reference voltage?
Yes, the LTC2378CDE-18#PBF requires an external reference voltage applied to the REF pin, with a supported range of 2.5 V to 5.1 V. The device does not include an internal reference; reference stability and noise directly impact SNR and THD performance - a low-noise, high-PSRR reference IC such as the LT6657 is recommended for optimal results.
How does Digital Gain Compression (DGC) function in the LTC2378CDE-18#PBF?
In the LTC2378CDE-18#PBF, DGC is activated by grounding the REF/DGC pin. This remaps the full-scale input range from ±VREF to 0.1×VREF to 0.9×VREF, enabling single-supply amplifiers (e.g., LT6350 powered from +5.5 V) to drive the ADC without negative rails - preserving all 18 bits of resolution while simplifying analog front-end design.
What package type is used for the LTC2378CDE-18#PBF?
The LTC2378CDE-18#PBF uses a 16-lead, 4 mm × 3 mm plastic DFN package with an exposed thermal pad (Pin 17). This compact, surface-mount package provides low thermal resistance (θJA = 40°C/W) and requires soldering the exposed pad directly to the PCB ground plane for optimal thermal performance and signal integrity.
Can the LTC2378CDE-18#PBF interface with a 1.8 V microcontroller?
Yes, the LTC2378CDE-18#PBF supports 1.8 V logic levels via its independent OVDD supply pin (Pin 15), which accepts 1.71 V to 5.25 V. When OVDD = 1.8 V, all digital I/O pins (SCK, SDO, RDL/SDI, BUSY, CNV, CHAIN) operate at 1.8 V logic thresholds - enabling direct connection to 1.8 V MCUs without level-shifting circuitry.
LTC2378CDE-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2378CDE-18#PBF FAQ
1.How can I place an order for LTC2378CDE-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2378CDE-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 LTC2378CDE-18#PBF reliable?
The price and inventory of LTC2378CDE-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 LTC2378CDE-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2378CDE-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2378CDE-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2378CDE-18#PBF?
LTC2378CDE-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2378CDE-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 LTC2378CDE-18#PBF?
For technical support, including LTC2378CDE-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2378CDE-18#PBF requirements.
6.How does Aetrix verify that LTC2378CDE-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2378CDE-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 LTC2378CDE-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2378CDE-18#PBF?
All LTC2378CDE-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2378CDE-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 LTC2378CDE-18#PBF part is unused and in its original packaging.
Return procedure for LTC2378CDE-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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