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Analog Devices Inc. LTC2378IMS-18#PBF
- Part No.:
- LTC2378IMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2378IMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,479
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Product details
Overview
LTC2378IMS-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 LTC2378IMS-18#PBF datasheet, LTC2378IMS-18#PBF pinout, LTC2378IMS-18#PBF application, or LTC2378IMS-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes operation, daisy-chain SPI interface compatibility, internal conversion clock, −40°C to +85°C industrial temperature rating, and MSOP-16 package with exposed pad grounding.
Technical Context
The LTC2378IMS-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 - 13.5 µW at 1 kSPS.
Digital gain compression (DGC) remaps the ADC's transfer function so zero-scale shifts from 0 V to 0.1·VREF and full-scale from VREF to 0.9·VREF, enabling rail-to-rail single-supply amplifier drive (e.g., LT6350 from +5.5 V) without sacrificing resolution or SNR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - delivers 262,144 discrete output levels with guaranteed no missing codes. |
| Sampling Rate | 1 Msps - supports real-time acquisition of signals up to 34 MHz input bandwidth (−3 dB). |
| SNR | 102 dB (typ, fIN = 2 kHz, VREF = 5 V) - enables >16.5 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 Dissipation | 13.5 mW at 1 Msps - low enough for battery-powered portable instrumentation with thermal headroom. |
| Reference Range | 2.5 V to 5.1 V - allows flexible system-level scaling and compatibility with standard reference ICs (e.g., LT6657). |
| Digital Interface | SPI-compatible, 1.8 V–5 V I/O - interoperable with FPGA, MCU, and DSP logic without level-shifting. |
Pinout & Package
Package: 16-lead plastic MSOP (4.0 mm × 3.0 mm), −40°C to +85°C operating range, exposed pad (GND) required for thermal and electrical performance.
| 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; bypassed with 10 µF ceramic capacitor to GND for noise immunity. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and improve PSRR in high-speed sampling. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±VREF fully differential signal; 45 pF input capacitance requires careful driver settling design. |
| 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 GND enables digital gain compression (0.5 V–4.5 V input range with 5 V REF); tied to REF disables DGC. |
| CNV (9) | Convert trigger | Rising-edge initiated conversion; powers up ADC and starts sampling phase with no setup time required. |
| BUSY (11) | Conversion status | Active-high open-drain indicator; asserts at CNV↑ and deasserts when 18-bit result is ready on SDO. |
| RDL/SDI (12) | Serial data control/input | In normal mode: bus enable; in chain mode: serial data input for cascaded ADC configurations. |
| SCK (13) | Serial clock input | 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-stateable output; presents 18-bit result after BUSY goes low; compatible with multi-drop SPI buses. |
| OVDD (15) | I/O supply | 1.71 V–5.25 V logic supply; sets voltage thresholds for all digital pins and enables mixed-voltage system interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Eliminates need for negative supply in front-end amplifiers by mapping full-scale to 10%–90% of ±VREF, enabling single +5.5 V LT6350 operation. |
| No Pipeline Delay / Zero Cycle Latency | Each CNV edge initiates a complete conversion with immediate BUSY assertion - critical for deterministic real-time control loops. |
| Internal Conversion Clock | Removes external timing constraints; simplifies PCB layout and eliminates clock jitter sensitivity in high-SNR applications. |
| Auto Power-Down Between Conversions | Reduces idle power to 0.9 µA (typ), scaling linearly with sample rate - extends battery life in intermittent-acquisition systems. |
| Guaranteed Operation to 85°C | Validated across full industrial temperature range (−40°C to +85°C), supporting deployment in harsh embedded environments. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
Use Scenario: Digitizing ultrasound echo signals or MRI gradient waveforms requiring high dynamic range and low distortion. IC Role / Device Role / Timing Role: Primary 18-bit SAR ADC capturing baseband analog signals at ≥1 MSPS with minimal latency and jitter. Use Value: 102 dB SNR and −124 dB THD preserve weak signal fidelity; DGC simplifies analog front-end power architecture. |
Use Scenario: Real-time waveform capture in automated test equipment (ATE) and oscilloscope front-ends. IC Role / Device Role / Timing Role: High-fidelity digitizer synchronized to external triggers with deterministic BUSY-driven readout timing. Use Value: No missing codes and ±1.75 LSB INL ensure accurate amplitude measurement; daisy-chain mode supports multi-channel parallel sampling. |
| Portable Instrumentation | Industrial Process Control |
Use Scenario: Battery-powered handheld analyzers performing spectral analysis or sensor signal conditioning. IC Role / Device Role / Timing Role: Low-power, high-resolution ADC minimizing system energy budget while maintaining metrology-grade accuracy. Use Value: 13.5 mW at 1 Msps and 13.5 µW at 1 ksps enables adaptive sampling; MSOP-16 footprint saves board space. |
Use Scenario: Precision monitoring of motor currents, temperature sensors, or pressure transducers in PLC I/O modules. IC Role / Device Role / Timing Role: Isolated analog input channel ADC interfaced via SPI to industrial microcontrollers (e.g., STM32H7). Use Value: ±VREF differential input rejects common-mode noise in electrically noisy factory environments; 85°C rating ensures reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5 MSPS, 2.5 V supply, but requires external reference and clock; no DGC; consumes 39 mW at full speed. | Higher throughput but less integrated - demands more external components and higher power; not suitable for ultra-low-power portable use. | Select when maximum sampling rate (>1 MSPS) is primary; avoid if DGC or sub-15 mW power is required. |
| ADS8860IDRCT | 16-bit, 1 MSPS, 2.5–5 V supply, SPI interface, no DGC, 100 dB SNR, 7.5 mW at 1 MSPS; smaller 3 mm × 3 mm WSON package. | Lower resolution and SNR; lacks DGC and guaranteed no-missing-codes at 16 bits; optimized for cost-sensitive, lower-dynamic-range systems. | Select for cost-constrained designs where 16-bit ENOB suffices and single-supply amplifier drive is handled externally. |
Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2378IMS-18#PBF uniquely balances 18-bit integrity, 102 dB SNR, DGC-enabled single-supply analog drive, and 13.5 mW power - making it optimal for portable, high-fidelity, thermally constrained industrial and medical systems.
Availability
LTC2378IMS-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 industrial temperature grade.
Supply support for LTC2378IMS-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 LTC2378IMS-18#PBF belongs to ADI's legacy Linear Technology precision SAR ADC product line, designed specifically for applications demanding high resolution, low noise, low power, and robust industrial temperature operation without compromising ease of use.
FAQ
What is the operating temperature range of the LTC2378IMS-18#PBF?
The LTC2378IMS-18#PBF is rated for −40°C to +85°C operation, validated across this full industrial temperature range per its datasheet specifications. This includes guaranteed performance for INL (±1.75 LSB), SNR (≥98.5 dB), and power consumption (13.5 mW typ at 1 Msps) under all conditions within that range.
Does the LTC2378IMS-18#PBF require an external clock source?
No, the LTC2378IMS-18#PBF includes an internal oscillator that sets the conversion time, eliminating the need for an external clock. The only required timing signal is the CNV pulse to initiate conversion; SCK is used solely for serial data readout and does not govern conversion timing.
How does Digital Gain Compression (DGC) work on the LTC2378IMS-18#PBF?
When the REF/DGC pin is grounded, the LTC2378IMS-18#PBF enables DGC, digitally remapping the full-scale input range from ±VREF to 0.1·VREF to 0.9·VREF. For a 5 V reference, this yields a 0.5 V–4.5 V usable input span - allowing single-supply amplifiers like the LT6350 to operate from +5.5 V without negative rails.
What package type is used for the LTC2378IMS-18#PBF?
The LTC2378IMS-18#PBF uses a 16-lead plastic MSOP package (4.0 mm × 3.0 mm) with an exposed pad (Pin 17 in DFN variants, not present in MSOP). The MSOP variant has four GND pins (3,6,10,16) and requires standard reflow soldering per JEDEC J-STD-020.
Is the LTC2378IMS-18#PBF pin-compatible with other members of the LTC2378 family?
Yes - the LTC2378IMS-18#PBF shares identical pinout and footprint with all MSOP-packaged LTC2378-x variants (e.g., LTC2378CMS-18#PBF, LTC2378HMS-18#PBF), differing only in temperature grade and screening. Electrical behavior, timing, and interface remain consistent across the family.
LTC2378IMS-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2378IMS-18#PBF FAQ
1.How can I place an order for LTC2378IMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2378IMS-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 LTC2378IMS-18#PBF reliable?
The price and inventory of LTC2378IMS-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 LTC2378IMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2378IMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2378IMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2378IMS-18#PBF?
LTC2378IMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2378IMS-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 LTC2378IMS-18#PBF?
For technical support, including LTC2378IMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2378IMS-18#PBF requirements.
6.How does Aetrix verify that LTC2378IMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2378IMS-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 LTC2378IMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2378IMS-18#PBF?
All LTC2378IMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2378IMS-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 LTC2378IMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2378IMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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