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Analog Devices Inc. LTC2377IMS-18#PBF
- Part No.:
- LTC2377IMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2377IMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,583
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Product details
Overview
LTC2377IMS-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 to 5.1V reference). It operates from a single 2.5V supply, consumes 6.8mW at full speed, and features digital gain compression (DGC) for single-supply amplifier interfacing - used in high-speed data acquisition and precision instrumentation.
For engineers reviewing the LTC2377IMS-18#PBF datasheet, LTC2377IMS-18#PBF pinout, LTC2377IMS-18#PBF application, or LTC2377IMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, internal conversion clock, SPI-compatible serial interface with daisy-chain mode, and –40°C to +85°C industrial temperature rating in 16-lead MSOP package.
Technical Context
The LTC2377IMS-18#PBF implements a charge-redistribution SAR architecture with a 18-bit CDAC and differential comparator, achieving no pipeline delay and zero cycle latency. Its conversion timing is governed by an internal oscillator, eliminating external clock dependency while supporting precise sampling control via CNV edge-triggering.
Digital gain compression (DGC) is implemented as a post-conversion scaling function that remaps zero-scale from 0V to 0.1·VREF and full-scale from VREF to 0.9·VREF - enabling use of single-supply amplifiers without sacrificing resolution. The device supports 1.8V–5V I/O logic levels via dedicated OVDD supply and offers daisy-chain capability through CHAIN and RDL/SDI pins.
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 | 500ksps - enables real-time capture of signals up to 250kHz Nyquist bandwidth with no throughput bottleneck. |
| SNR | 102dB (typ, fIN = 2kHz, VREF = 5V) - corresponds to ~0.999999 effective linearity, critical for dynamic signal fidelity. |
| INL | ±1.75LSB (max) - ensures monotonicity and accurate end-point calibration over temperature and process variation. |
| Power Consumption | 6.8mW at 500ksps - enables battery-operated or thermally constrained systems without active thermal management. |
| Reference Range | 2.5V to 5.1V - allows flexible system-level voltage scaling and compatibility with standard precision references. |
| Digital Interface | SPI-compatible with daisy-chain mode - reduces host GPIO count and simplifies multi-channel ADC synchronization. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), exposed pad not present (unlike DFN variant), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | Low = normal SPI mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = serial data input). |
| VDD (2) | Analog supply | 2.5V ±62.5mV supply for core ADC circuitry; requires 10µF ceramic bypass to GND. |
| 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 input; input capacitance 45pF in sample mode, 5pF in hold mode. |
| REF (7) | Reference voltage input | 2.5V–5.1V external reference; decoupled with 47µF X5R ceramic capacitor at pin. |
| REF/DGC (8) | Reference/DGC control | Tied to REF → DGC disabled (±VREF full-scale); tied to GND → DGC enabled (0.1–0.9·VREF full-scale). |
| CNV (9) | Convert trigger | Rising-edge initiates conversion; powers up ADC and starts acquisition phase automatically. |
| BUSY (11) | Status indicator | Active-high open-drain output signaling conversion in progress; synchronous with CNV edge. |
| RDL/SDI (12) | Serial interface control/data | Function depends on CHAIN state; enables SDO or accepts daisy-chain input data. |
| SCK (13) | Serial clock input | Supports up to 100MHz SCK (10ns period); rising edge clocks out MSB-first 2's complement data on SDO. |
| SDO (14) | Serial data output | Tri-stateable output delivering 18-bit result; valid 9.5ns after SCK↑ (CL = 20pF). |
| OVDD (15) | I/O supply | 1.71V–5.25V logic supply; sets VIH/VIL thresholds and drives SDO; bypassed with 0.1µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Enables single-supply amplifier drive (e.g., LT6350 from +5.5V) by mapping 0.5V–4.5V input range to full 18-bit scale when VREF = 5V. |
| No Cycle Latency | Delivers first valid conversion result immediately after CNV rising edge - eliminates pipeline delay for deterministic timing control. |
| Auto Power-Down | Reduces current to 0.9µA between conversions, scaling power dissipation linearly with sampling rate (e.g., 6.8µW at 500sps). |
| Internal Conversion Clock | Removes need for external timing components or master clock synchronization - simplifies PCB layout and system timing design. |
| Wide I/O Voltage Support | OVDD range (1.71V–5.25V) permits direct interfacing with 1.8V, 2.5V, 3.3V, or 5V microcontrollers/FPGAs without level shifters. |
Applications
| Medical Imaging Signal Chain | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-noise, wide-dynamic-range analog outputs from ultrasound beamformer channels or MRI gradient sensors. IC Role / Device Role / Timing Role: High-fidelity 18-bit SAR ADC capturing transient waveforms at 500ksps with minimal quantization noise and distortion. Use Value: 102dB SNR and –124dB THD preserve weak signal integrity in diagnostic imaging, directly improving image contrast resolution. | Use Scenario: High-accuracy monitoring of pressure, temperature, and flow transducers in PLC analog input modules. IC Role / Device Role / Timing Role: Precision ADC with guaranteed no-missing-codes and ±1.75LSB INL for metrology-grade sensor digitization. Use Value: Stable performance across –40°C to +85°C ensures long-term calibration validity in uncontrolled factory environments. |
| Portable Test Equipment | Battery-Powered Data Loggers |
Use Scenario: Handheld oscilloscopes and spectrum analyzers requiring high-resolution acquisition in compact form factors. IC Role / Device Role / Timing Role: Low-power 18-bit ADC with internal clock and auto power-down enabling >10-hour battery life at 100ksps. Use Value: 6.8mW consumption at full speed and 6.8µW at 500sps allows adaptive sampling strategies without thermal throttling. | Use Scenario: Remote environmental monitoring nodes logging vibration, acoustic emission, or strain gauge data over weeks. IC Role / Device Role / Timing Role: SAR ADC with DGC simplifying front-end amplifier design using single 3.3V or 5V supply rails. Use Value: Eliminates need for dual-rail op-amps and negative supplies - reducing BOM cost, board area, and power conversion complexity. |
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, 1MSPS, 11.5mW @ 1MSPS; requires external reference; no DGC; uses 3-wire SPI only (no daisy-chain). | Higher speed but higher power; lacks DGC and daisy-chain - less suitable for space-constrained single-supply systems. | Select when maximum throughput >500ksps is required and external reference is acceptable. |
| ADS8860IDRCT | 16-bit, 1MSPS, 5.5mW @ 1MSPS; internal reference; no DGC; SPI with daisy-chain; smaller 3mm × 3mm WSON package. | Lower resolution (16-bit), no DGC, but lower power and smaller footprint - trade-off for cost-sensitive, size-limited designs. | Select when 16-bit resolution suffices and board area is critical; verify SNR/THD meets system requirements. |
Compared with AD7986BCPZ-RL7 and ADS8860IDRCT, the LTC2377IMS-18#PBF uniquely combines 18-bit no-missing-codes accuracy, integrated DGC for single-supply front-end simplification, and daisy-chain capability - making it optimal for industrial and portable systems demanding precision, low power, and layout efficiency.
Availability
LTC2377IMS-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process monitoring, and portable test equipment requiring stable component supply, extended temperature support, and long-term production continuity.
Supply support for LTC2377IMS-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 LTC2377IMS-18#PBF belongs to ADI's legacy Linear Technology precision SAR ADC product line, designed specifically for applications demanding ultra-low noise, high DC accuracy, and low power in harsh industrial and portable environments.
FAQ
What is the operating temperature range of the LTC2377IMS-18#PBF?
The LTC2377IMS-18#PBF is rated for operation from –40°C to +85°C, meeting industrial temperature requirements. This is confirmed in the Absolute Maximum Ratings table and Order Information section, where "I" grade denotes the –40°C to +85°C range. The device maintains full specifications including ±1.75LSB INL and 102dB SNR across this range, as verified in Figure G10 and G11 of the datasheet.
Does the LTC2377IMS-18#PBF require an external clock source?
No, the LTC2377IMS-18#PBF does not require an external clock source. It incorporates an internal oscillator that sets the conversion time, eliminating external timing dependencies. The datasheet explicitly states "An internal oscillator sets the conversion time, easing external timing considerations," and timing parameters like tCONV (1–1.5µs) and tCYC (2µs) are specified as guaranteed over temperature without external clock conditioning.
How does Digital Gain Compression (DGC) work in the LTC2377IMS-18#PBF?
Digital Gain Compression (DGC) in the LTC2377IMS-18#PBF is activated by grounding the REF/DGC pin (Pin 8). When enabled, it digitally remaps the zero-scale code from 0V to 0.1·VREF and full-scale code from VREF to 0.9·VREF. For VREF = 5V, this yields a usable input range of 0.5V to 4.5V - allowing single-supply amplifiers (e.g., LT6350 from +5.5V) to drive the ADC without negative rails while preserving full 18-bit resolution.
What package type is used for the LTC2377IMS-18#PBF?
The LTC2377IMS-18#PBF uses a 16-lead plastic MSOP package (3mm × 4.9mm body, 0.65mm pitch), as specified in the Order Information table. This differs from the DFN variant (e.g., LTC2377CDE-18#PBF), which uses a 4mm × 3mm DFN with exposed pad. The MSOP package has no exposed thermal pad and is rated for –40°C to +85°C operation.
Can the LTC2377IMS-18#PBF interface directly with a 1.8V microcontroller?
Yes, the LTC2377IMS-18#PBF can interface directly with a 1.8V microcontroller. Its OVDD supply pin accepts 1.71V to 5.25V, and digital input thresholds (VIH/VIL) scale with OVDD (VIH = 0.8·OVDD, VIL = 0.2·OVDD). With OVDD = 1.8V, VIH = 1.44V and VIL = 0.36V - compatible with standard 1.8V logic families. SDO output also swings rail-to-rail relative to OVDD, ensuring clean level matching.
LTC2377IMS-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2377IMS-18#PBF FAQ
1.How can I place an order for LTC2377IMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2377IMS-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 LTC2377IMS-18#PBF reliable?
The price and inventory of LTC2377IMS-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 LTC2377IMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2377IMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2377IMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2377IMS-18#PBF?
LTC2377IMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2377IMS-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 LTC2377IMS-18#PBF?
For technical support, including LTC2377IMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2377IMS-18#PBF requirements.
6.How does Aetrix verify that LTC2377IMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2377IMS-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 LTC2377IMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2377IMS-18#PBF?
All LTC2377IMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2377IMS-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 LTC2377IMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2377IMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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