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Analog Devices Inc. LTC2377CMS-18#PBF
- Part No.:
- LTC2377CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2377CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
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Product details
Overview
LTC2377CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 500ksps successive approximation register (SAR) analog-to-digital converter with ±1.75LSB INL max, 102dB SNR at 2kHz, and fully differential ±VREF input range (2.5V–5.1V reference). It operates from a single 2.5V supply, consumes 6.8mW at full speed, and features digital gain compression (DGC) to enable single-supply amplifier driving. It is used in high-speed data acquisition systems requiring precision, low power, and wide dynamic range.
For engineers reviewing the LTC2377CMS-18#PBF datasheet, LTC2377CMS-18#PBF pinout, LTC2377CMS-18#PBF application, or LTC2377CMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes performance, daisy-chain SPI interface compatibility (1.8V–5V I/O), internal conversion clock, -40°C to 85°C industrial temperature range, and MSOP-16 package with exposed thermal pad.
Technical Context
The LTC2377CMS-18#PBF implements a charge-redistribution SAR architecture with a 18-bit CDAC and differential comparator, supporting true bipolar input ranges via ±VREF configuration. Its conversion timing is internally clocked (1.5µs typical), eliminating external clock dependency and pipeline latency.
Digital Gain Compression (DGC) is implemented by re-mapping zero-scale from 0V to 0.1·VREF and full-scale from VREF to 0.9·VREF - enabling rail-to-rail input swing accommodation (e.g., 0.5V–4.5V for 5V reference) without negative supply for driver amplifiers. The device supports both normal and daisy-chain SPI modes via the CHAIN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - delivers 262,144 discrete output levels for high-fidelity signal digitization |
| Sampling Rate | 500ksps - enables real-time capture of signals up to 250kHz Nyquist bandwidth |
| SNR | 102dB (typ, fIN=2kHz, VREF=5V) - supports >16.5 effective number of bits (ENOB) |
| INL | ±1.75LSB (max) - ensures monotonicity and accurate end-point linearity across full scale |
| Power Consumption | 6.8mW at 500ksps - enables portable instrumentation and thermally constrained designs |
| Reference Range | 2.5V to 5.1V - allows flexible system-level scaling and noise-performance tradeoffs |
| Digital I/O Voltage | 1.8V to 5V (OVDD) - interoperates with mixed-voltage host controllers without level shifters |
Pinout & Package
Package: 16-lead plastic MSOP (4.0mm × 3.0mm), exposed pad (GND), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode control input | Selects normal mode (RDL/SDI = bus enable) or daisy-chain mode (RDL/SDI = serial data input) |
| VDD (2) | Analog supply | 2.375V–2.625V, powers core ADC and reference circuitry; requires 10µF ceramic bypass |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and improve PSRR |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±VREF input range; 45pF sampling capacitance, 40Ω switch RON; require matched drive |
| REF (7) | Reference voltage input | 2.5V–5.1V external reference; decoupled with 47µF X5R ceramic capacitor |
| REF/DGC (8) | Reference/DGC mode select | Tied to REF → DGC disabled (±VREF range); tied to GND → DGC enabled (0.1–0.9×VREF range) |
| CNV (9) | Convert trigger | Rising edge initiates acquisition and conversion; powers up device from auto-power-down state |
| BUSY (11) | Status indicator | Active-high open-drain signal indicating conversion in progress; synchronous with CNV |
| RDL/SDI (12) | Serial interface control/data | In normal mode: enables/disables SDO tri-state; in chain mode: serial data input for daisy-chain |
| SCK (13) | Serial clock input | Up to 100MHz clock rate; rising-edge sampled; determines data transfer timing |
| SDO (14) | Serial data output | 2's complement 18-bit result shifted MSB-first on SCK rising edges; tri-state controlled by RDL |
| OVDD (15) | Digital I/O supply | 1.71V–5.25V logic interface supply; sets VIH/VIL thresholds; bypassed with 0.1µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 18 bits | Guaranteed monotonicity over full temperature range eliminates code ambiguities in closed-loop control |
| Digital Gain Compression (DGC) | Enables single-supply amplifier operation (e.g., LT6350 from +5.5V) while preserving full 18-bit resolution |
| Internal conversion clock | Removes need for external timing circuitry and simplifies PCB layout and synchronization |
| Auto power-down between conversions | Reduces idle power to 0.9µA (typ), scaling linearly with sample rate for battery-powered applications |
| SPI-compatible daisy-chain mode | Supports multi-ADC systems with shared SCK/SDO lines and minimal interconnect wiring |
Applications
| Medical Imaging Signal Chain | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-noise, wide-dynamic-range sensor outputs (e.g., CT/PET detector front-ends) where SNR and linearity directly impact image fidelity. IC Role / Device Role / Timing Role: Primary high-resolution ADC capturing analog signals from low-noise preamplifiers and filters at up to 500ksps. Use Value: 102dB SNR and ±1.75LSB INL ensure accurate reconstruction of subtle contrast gradients and low-amplitude events. | Use Scenario: High-accuracy monitoring of pressure, temperature, and flow transducers in distributed PLC I/O modules operating across extended industrial temperatures. IC Role / Device Role / Timing Role: Precision SAR ADC interfacing with isolated analog front-ends and reporting via SPI to microcontroller-based controllers. Use Value: Guaranteed operation to 85°C, no missing codes, and DGC simplify analog driver design while maintaining calibration stability. |
| Portable Test Equipment | Automated Test Equipment (ATE) |
Use Scenario: Battery-powered handheld oscilloscopes or spectrum analyzers requiring high resolution, low power, and compact form factor. IC Role / Device Role / Timing Role: Core digitizer in multi-channel acquisition subsystem, leveraging auto power-down and daisy-chain capability. Use Value: 6.8mW active power and 0.9µA shutdown current extend battery life; MSOP-16 footprint saves board space. | Use Scenario: High-channel-count ATE systems performing parallel parametric testing of ICs or RF components with tight measurement repeatability requirements. IC Role / Device Role / Timing Role: Synchronized multi-ADC node in modular digitizer card, using daisy-chain SPI to reduce FPGA pin count and routing complexity. Use Value: No cycle latency and deterministic 2µs conversion period enable precise time-aligned sampling across channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7986BCPZ-RL7 | 18-bit, 1MSPS, 11.5mW, SPI-only (no daisy-chain), VREF fixed at 5V, LFCSP-24 package | Higher speed but no DGC; requires dual-supply op-amps for full-scale differential input | Choose when throughput >500ksps is critical and system already uses 5V reference and dual-supply drivers |
| ADS8860IDRCT | 16-bit, 1MSPS, 5.5mW, pseudo-differential input, VREF 2.5V–5V, WSON-10 package | Lower resolution (16-bit), no DGC, smaller package but lacks fully differential input and industrial temp grade | Choose for cost-sensitive, space-constrained designs where 16-bit resolution suffices and driver complexity is acceptable |
Compared with AD7986BCPZ-RL7 and ADS8860IDRCT, the LTC2377CMS-18#PBF uniquely combines 18-bit no-missing-codes accuracy, integrated DGC for single-supply driver compatibility, and daisy-chain SPI - making it optimal for thermally demanding, power-conscious, multi-channel precision acquisition where analog front-end simplification is prioritized.
Availability
LTC2377CMS-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process monitoring systems, and portable test equipment requiring stable component supply, long-term manufacturability, and guaranteed industrial temperature performance.
Supply support for LTC2377CMS-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 LTC2377-18 belongs to ADI's precision SAR ADC product line, designed specifically for applications demanding high resolution, low power, and robust operation in thermally challenging environments - including data acquisition, instrumentation, and automated test systems.
FAQ
What is the operating temperature range for the LTC2377CMS-18#PBF?
The LTC2377CMS-18#PBF is rated for operation from –40°C to +85°C, meeting industrial temperature requirements. This is confirmed in the Order Information table, where "LTC2377IMS-18#PBF" denotes the industrial-grade variant, and the "CMS" prefix in LTC2377CMS-18#PBF corresponds to the same MSOP-16 packaging and temperature grade per Linear Technology's part numbering convention.
Does the LTC2377CMS-18#PBF support daisy-chain SPI configuration?
Yes, the LTC2377CMS-18#PBF supports daisy-chain SPI mode via the CHAIN pin (Pin 1). When CHAIN is high, the RDL/SDI pin functions as serial data input, allowing multiple LTC2377CMS-18#PBF devices to share SCK and SDO lines. Timing parameters such as tSCKCH (13.5ns min) and tDSDO (9.5ns typ) are specified for this mode in the datasheet.
How does Digital Gain Compression (DGC) work in the LTC2377CMS-18#PBF?
Digital Gain Compression (DGC) in the LTC2377CMS-18#PBF is activated by grounding the REF/DGC pin (Pin 8). It digitally remaps the zero-scale code from 0V to 0.1·VREF and full-scale code from VREF to 0.9·VREF, resulting in an effective input range of 0.1–0.9×VREF. For VREF = 5V, this yields 0.5V–4.5V swing - enabling single-supply driver amplifiers like the LT6350 to operate from +5.5V without negative rails.
What is the minimum and maximum reference voltage supported by the LTC2377CMS-18#PBF?
The LTC2377CMS-18#PBF supports a reference voltage range of 2.5V to 5.1V, as specified in the "REFERENCE INPUT" section (VREF MIN/MAX = 2.5V/5.1V). Operation outside this range violates absolute maximum ratings and may cause parametric degradation or damage. Reference current is 0.32–0.4mA (typ), scaling with sample rate.
Is the LTC2377CMS-18#PBF pin-compatible with other members of the LTC2377 family?
Yes, the LTC2377CMS-18#PBF shares identical pinout and package (16-lead MSOP) with all LTC2377-x variants (e.g., LTC2377IMS-18#PBF, LTC2377HMS-18#PBF), differing only in temperature grade and part marking. Pin functions, electrical behavior, and timing specifications are consistent across the family, enabling drop-in replacement within the same temperature requirement.
LTC2377CMS-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):
- 500k
- 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:
- -
LTC2377CMS-18#PBF FAQ
1.How can I place an order for LTC2377CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2377CMS-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 LTC2377CMS-18#PBF reliable?
The price and inventory of LTC2377CMS-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 LTC2377CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2377CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2377CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2377CMS-18#PBF?
LTC2377CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2377CMS-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 LTC2377CMS-18#PBF?
For technical support, including LTC2377CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2377CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2377CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2377CMS-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 LTC2377CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2377CMS-18#PBF?
All LTC2377CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2377CMS-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 LTC2377CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2377CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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