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Analog Devices Inc. LTC2377CMS-20#PBF
- Part No.:
- LTC2377CMS-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2377CMS-20#PBF.pdf
- Description:
- IC ADC 20BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,217
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Product details
Overview
LTC2377CMS-20#PBF from Analog Devices (formerly Linear Technology) is a 20-bit, 500ksps successive approximation register (SAR) analog-to-digital converter with ±0.5ppm typical integral nonlinearity, 104dB SNR at 2kHz, and digital gain compression (DGC) for single-supply amplifier interfacing. It operates from a 2.5V VDD supply, supports ±VREF fully differential input range (VREF = 2.5V to 5.1V), and consumes only 10.5mW at full throughput - enabling high-precision data acquisition in medical imaging and portable instrumentation.
For engineers reviewing the LTC2377CMS-20#PBF datasheet, LTC2377CMS-20#PBF pinout, LTC2377CMS-20#PBF application, or LTC2377CMS-20#PBF equivalent, key selection considerations include guaranteed 20-bit no-missing-codes performance, daisy-chain SPI interface compatibility across 1.8V–5V logic levels, internal conversion clock, and DGC-enabled 0.5V–4.5V input range with 5V reference.
Technical Context
The LTC2377CMS-20#PBF implements a charge-redistribution SAR architecture with a 20-bit CDAC and differential comparator, achieving zero-cycle latency and no pipeline delay. Its internal oscillator eliminates external timing dependencies, while auto power-down between conversions scales quiescent current from 4.9mA at 500ksps to 0.1µA in shutdown.
Digital gain compression (DGC) is controlled via the REF/DGC pin: tied to GND enables 10%–90% full-scale mapping (e.g., 0.5V–4.5V with 5V VREF), removing need for negative supply on driving amplifiers; tied to VREF disables DGC for standard ±VREF operation. The SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as serial data input).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit - delivers 1 ppm LSB size (9.5 µV at 5V reference), enabling sub-ppm measurement precision in metrology-grade systems. |
| Sampling Rate | 500 ksps - supports real-time capture of signals up to 34 MHz input bandwidth without undersampling penalties. |
| INL (max) | ±2 ppm - ensures monotonicity and <0.1 LSB error across full temperature range (0°C to 70°C), critical for closed-loop control accuracy. |
| SNR (typ) | 104 dB at fIN = 2 kHz - corresponds to effective resolution >17.0 bits, preserving dynamic range in low-noise sensor interfaces. |
| Power (500ksps) | 10.5 mW - enables battery-operated 20-bit acquisition with thermal dissipation compatible with MSOP-16 packaging. |
| Digital Interface | SPI-compatible with 1.8V–5V OVDD - allows direct connection to FPGA, MCU, or DSP I/O banks without level-shifting circuitry. |
| Reference Range | 2.5V to 5.1V - supports flexible system-level scaling: higher VREF improves SNR margin; lower VREF reduces power in signal-chain-limited applications. |
Pinout & Package
Package: 16-lead plastic MSOP (4.0mm × 3.0mm × 1.1mm), exposed pad not present (DFN variant has exposed pad; MSOP does not). RoHS-compliant, lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High enables daisy-chain SPI; low configures RDL/SDI as bus-enable input - determines serial topology without external logic. |
| VDD (2) | Analog supply | 2.5V ±62.5mV supply powering core ADC and reference buffer - requires 10µF ceramic bypass to GND for noise immunity. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and separate analog/digital return paths for optimal INL stability. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±VREF input range; modeled as 45pF switched capacitor + 40Ω series resistance - require matched 10–50Ω source impedance for full spec compliance. |
| REF (7) | Reference voltage input | 2.5V–5.1V external reference; decoupled with 47µF X7R ceramic capacitor - sets full-scale range and LSB size (e.g., 9.5µV at 5V). |
| REF/DGC (8) | DGC control / reference select | Tied to GND enables digital gain compression (0.1×VREF to 0.9×VREF range); tied to VREF disables DGC for standard ±VREF operation. |
| CNV (9) | Convert trigger | Rising edge initiates acquisition and conversion - asynchronous, OVDD-referenced, with 20ns minimum pulse width. |
| BUSY (11) | Conversion status | Active-high open-drain output indicating conversion in progress; transitions low 1.5µs after CNV rising edge. |
| RDL/SDI (12) | Serial interface control/data | In normal mode: bus-enable input; in chain mode: serial data input - eliminates need for external multiplexing in multi-ADC systems. |
| SCK (13) | Serial clock input | Supports up to 100MHz SCK (10ns period); timing-critical for data capture - rising edge clocks out MSB-first 2's complement code on SDO. |
| SDO (14) | Serial data output | Tri-stateable output delivering 20-bit result; valid within 7.5ns of SCK↑ (OVDD=5.25V) - enables high-speed daisy-chained readout. |
| OVDD (15) | I/O supply | 1.71V–5.25V digital interface supply - sets logic thresholds (VIH/VIL = 0.8/0.2×OVDD) and drives SDO/SCK/RDL/SDI/BUSY outputs. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 20 bits | Guaranteed over full operating temperature range (0°C to 70°C), eliminating data gaps in critical safety or calibration applications. |
| Digital Gain Compression (DGC) | Enables single-supply amplifier drive (e.g., 5.5V rail) by remapping full-scale to 10%–90% of VREF - removes need for negative supply without resolution loss. |
| Internal conversion clock | Eliminates external clock source and associated jitter; fixed 1.5µs conversion time ensures deterministic timing for synchronous sampling. |
| Auto power-down | Reduces current from 4.9mA to 0.1µA between conversions - cuts average power by >99% during idle periods in burst-mode acquisition. |
| Daisy-chain SPI mode | Allows cascading multiple LTC2377CMS-20#PBF devices on shared SCK/SDO lines using CHAIN and RDL/SDI - simplifies PCB routing and firmware for multi-channel systems. |
Applications
| Medical Imaging Signal Chain | Portable High-Precision DMM |
|---|---|
Use Scenario: Digitizing low-amplitude, high-frequency ultrasound echo signals in handheld diagnostic equipment with strict power and size constraints. IC Role / Device Role / Timing Role: Primary 20-bit SAR ADC capturing 500ksps continuous waveforms; internal clock synchronizes sampling without external timing components. Use Value: 104dB SNR preserves weak signal integrity; DGC allows single 5V supply for front-end op-amps, reducing BOM count and board area by 30% vs dual-rail designs. |
Use Scenario: High-accuracy DC voltage/current measurement in battery-powered handheld multimeters requiring >100dB dynamic range. IC Role / Device Role / Timing Role: Precision digitizer for autoranging analog front-end; no missing codes ensures traceable calibration across full 20-bit span. Use Value: ±0.5ppm INL enables NIST-traceable measurements; 10.5mW power supports >10-hour battery life at 500ksps sampling for fast continuity testing. |
| Industrial Process Controller ADC | ATE Semiconductor Test Head |
Use Scenario: Monitoring high-voltage motor phase currents and temperatures in programmable logic controller (PLC) I/O modules deployed in harsh factory environments. IC Role / Device Role / Timing Role: Isolated analog input channel ADC; operates at 0°C to 70°C with guaranteed specs - no derating required. Use Value: 86dB CMRR rejects common-mode noise from VFDs; ±2ppm INL max ensures <0.001% gain error over temperature - meets SIL-2 functional safety requirements. |
Use Scenario: High-speed parametric testing of analog ICs requiring precise stimulus/response capture at 500ksps with sub-ppm linearity. IC Role / Device Role / Timing Role: Digitizer in parallel test head architecture; daisy-chain mode reads 8+ channels simultaneously over single SPI bus. Use Value: Zero-cycle latency enables real-time pass/fail decisions; 104dB SNR validates DAC linearity to 17.0+ effective bits - reduces test time by 22% vs 18-bit alternatives. |
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 |
|---|---|---|---|
| AD4020BRMZ | 20-bit, 1.8Msps, 100dB SNR, 1.8V–5.5V IOVDD, no DGC function, 10-lead LFCSP package | Higher speed but lower SNR; lacks DGC - requires dual-supply op-amp drivers for full-scale utilization | Select when >500ksps throughput is mandatory and system already uses dual-rail amplifiers. |
| ADS1263IPBS | 24-bit delta-sigma, 40ksps, 120dB SNR, integrated PGA and reference, 32-pin TQFP package | Lower speed, higher resolution, sigma-delta architecture - better for DC/low-frequency sensors, worse for wideband signals | Select for weigh scale or thermocouple applications where DC stability > AC bandwidth; avoid for >10kHz signal capture. |
Compared with AD4020BRMZ and ADS1263IPBS, the LTC2377CMS-20#PBF uniquely balances 500ksps speed, 104dB SNR, and DGC-enabled single-supply operation in a compact MSOP-16 package - making it optimal for portable, battery-constrained, wideband precision systems where driver simplicity and thermal efficiency are prioritized over raw speed or ultra-low-frequency resolution.
Availability
LTC2377CMS-20#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, portable high-precision DMMs, and industrial process controllers requiring stable component supply with guaranteed 0°C to 70°C operation and long-term production continuity.
Supply support for LTC2377CMS-20#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 since 1965.
The LTC2377CMS-20#PBF belongs to ADI's legacy Linear Technology precision SAR ADC product line, engineered specifically for applications demanding 20-bit accuracy, low power, and seamless integration with single-supply signal conditioning - such as portable instrumentation and high-channel-count data acquisition.
FAQ
What is the maximum sampling rate of the LTC2377CMS-20#PBF?
The LTC2377CMS-20#PBF achieves a guaranteed maximum sampling rate of 500 ksps across its full operating temperature range (0°C to 70°C). This rate is supported by an internal oscillator that fixes conversion time at 1.5 µs, eliminating external clock dependencies and ensuring deterministic timing for synchronous acquisition systems.
Does the LTC2377CMS-20#PBF support daisy-chain configuration?
Yes, the LTC2377CMS-20#PBF supports daisy-chain SPI operation when the CHAIN pin (Pin 1) is driven high. In this mode, the RDL/SDI pin functions as serial data input, allowing multiple LTC2377CMS-20#PBF devices to share a single SCK and SDO line - reducing GPIO usage and simplifying firmware for multi-channel data acquisition.
How does Digital Gain Compression (DGC) work on the LTC2377CMS-20#PBF?
Digital Gain Compression (DGC) on the LTC2377CMS-20#PBF is enabled by grounding the REF/DGC pin (Pin 8). This remaps the full-scale input range from ±VREF to 0.1×VREF to 0.9×VREF (e.g., 0.5V–4.5V with 5V reference), eliminating the need for a negative supply on driving amplifiers while preserving all 20 bits of resolution and linearity.
What package type is used for the LTC2377CMS-20#PBF?
The LTC2377CMS-20#PBF uses a 16-lead plastic MSOP package (4.0mm × 3.0mm × 1.1mm) with no exposed thermal pad. This differs from the DFN variant (e.g., LTC2377CDE-20#PBF), which includes an exposed pad for enhanced thermal performance - the MSOP version prioritizes ease of assembly and rework in space-constrained layouts.
Is the LTC2377CMS-20#PBF pin-compatible with other members of the LTC2377 family?
Yes, the LTC2377CMS-20#PBF shares identical pinout and footprint with all MSOP-packaged variants in the LTC2377 family (e.g., LTC2377IMS-20#PBF, LTC2377CMS-18#PBF), including same VDD, OVDD, REF, CNV, BUSY, and SPI signal assignments - enabling drop-in replacement for different speed grades or temperature ranges without PCB redesign.
LTC2377CMS-20#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:
- 20
- 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-20#PBF FAQ
1.How can I place an order for LTC2377CMS-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2377CMS-20#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-20#PBF reliable?
The price and inventory of LTC2377CMS-20#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-20#PBF is usually 5 days.
3.What payment methods are accepted for LTC2377CMS-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2377CMS-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2377CMS-20#PBF?
LTC2377CMS-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2377CMS-20#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-20#PBF?
For technical support, including LTC2377CMS-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2377CMS-20#PBF requirements.
6.How does Aetrix verify that LTC2377CMS-20#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2377CMS-20#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-20#PBF meets industry standards.
7.What is the process for return or replacement of LTC2377CMS-20#PBF?
All LTC2377CMS-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2377CMS-20#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-20#PBF part is unused and in its original packaging.
Return procedure for LTC2377CMS-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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