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Analog Devices Inc. LTC2378IMS-20#PBF
- Part No.:
- LTC2378IMS-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2378IMS-20#PBF.pdf
- Description:
- IC ADC 20BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:141
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Product details
Overview
LTC2378IMS-20#PBF from Analog Devices (formerly Linear Technology) is a 20-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with ±0.5 ppm typical integral nonlinearity, 104 dB SNR at 2 kHz, and fully differential ±VREF input range (VREF = 2.5 V to 5.1 V). It operates from a 2.5 V supply, consumes 21 mW at full speed, and features digital gain compression (DGC) for single-supply amplifier interfacing - used in high-precision medical imaging and portable instrumentation.
For engineers reviewing the LTC2378IMS-20#PBF datasheet, LTC2378IMS-20#PBF pinout, LTC2378IMS-20#PBF application, or LTC2378IMS-20#PBF equivalent, key selection criteria include guaranteed 20-bit no-missing-codes performance, daisy-chain SPI interface compatibility, internal conversion clock, −40°C to +85°C industrial temperature rating, and MSOP-16 package with exposed pad grounding requirement.
Technical Context
The LTC2378IMS-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 clock dependency, while auto power-down between conversions scales quiescent current from 21 mW at 1 Msps to 21 µW at 1 ksps.
Digital gain compression (DGC) maps the ADC's full-scale input range from ±VREF to 0.1×VREF to 0.9×VREF, enabling rail-to-rail operation of driving amplifiers powered from a single 5.5 V supply - preserving full 20-bit resolution without negative supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit - delivers 1 ppm LSB step size (9.5 µV at 5 V reference), enabling sub-microvolt DC measurement fidelity. |
| Sampling Rate | 1 Msps - supports real-time capture of signals up to 34 MHz input bandwidth with no throughput penalty or latency. |
| INL | ±0.5 ppm typical, ±2 ppm max - ensures monotonicity and accurate end-point linearity across full temperature range (−40°C to +85°C). |
| SNR | 104 dB typical at fIN = 2 kHz - corresponds to <2.3 ppmRMS noise floor, critical for dynamic signal analysis in spectral applications. |
| Power Consumption | 21 mW at 1 Msps, 21 µW at 1 ksps - enables battery-powered precision data acquisition with adaptive power scaling. |
| Reference Range | 2.5 V to 5.1 V - allows flexible system-level trade-offs between dynamic range, noise, and headroom for front-end driver design. |
| Digital Interface | SPI-compatible with 1.8 V–5 V I/O logic and daisy-chain mode - simplifies multi-channel synchronization without FPGA resource overhead. |
Pinout & Package
The LTC2378IMS-20#PBF is housed in a 16-lead plastic MSOP package with exposed pad (pin 17 not present in MSOP; only in DFN variant), rated for −40°C to +85°C operation. Pin 1 (CHAIN) selects normal vs. daisy-chain mode; pins 4/5 (IN+/IN−) form a fully differential analog input pair referenced to GND; pin 8 (REF/DGC) configures digital gain compression by tie to GND (enabled) or REF (disabled); pin 9 (CNV) initiates conversion on rising edge; pin 11 (BUSY) indicates active conversion; pins 12–14 (RDL/SDI, SCK, SDO) implement SPI serial interface with OVDD-referenced logic levels.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High enables daisy-chain mode (RDL/SDI becomes SDI); low enables bus-enable mode (RDL/SDI controls SDO tri-state). |
| VDD (2) | Analog supply | 2.5 V ±62.5 mV supply for core ADC circuitry; requires 10 µF ceramic bypass to GND. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and ensure stable reference for analog and digital sections. |
| IN+, IN− (4,5) | Differential analog input | Accepts ±VREF fully differential signal; input capacitance 45 pF in sample mode, common-mode range centered at VREF/2 ±0.1 V. |
| REF (7) | Reference voltage input | 2.5 V–5.1 V external reference; decoupled with 47 µF X7R ceramic capacitor (1210 size, 10 V rating). |
| REF/DGC (8) | Reference/DGC control | Tie to GND to enable digital gain compression (0.1–0.9×VREF input range); tie to REF to disable (±VREF range). |
| CNV (9) | Convert trigger | Rising-edge sensitive; powers up ADC and starts conversion; timing-critical for deterministic sampling. |
| BUSY (11) | Conversion status | Active-high open-drain output indicating conversion in progress; used for hardware handshaking or interrupt generation. |
| RDL/SDI (12) | Serial data control/input | In normal mode: bus enable for SDO; in chain mode: serial data input for daisy-chained configuration. |
| SCK (13) | Serial clock | Up to 100 MHz clock input; rising edge clocks out MSB-first 2's complement data on SDO. |
| SDO (14) | Serial data output | Tri-stateable output delivering 20-bit result; timing-specified for CL = 20 pF and OVDD = 1.71–5.25 V. |
| OVDD (15) | I/O supply | 1.71 V–5.25 V digital interface supply; sets logic thresholds (VIH/VIL = 0.8/0.2 × OVDD); bypassed with 0.1 µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 20 bits | Guaranteed over full operating temperature range (−40°C to +85°C), eliminating code ambiguity in closed-loop control and metrology systems. |
| Digital gain compression (DGC) | Enables single-supply amplifier operation by remapping full-scale input from ±VREF to 0.1–0.9×VREF, preserving full resolution without negative rail. |
| Internal conversion clock | Removes need for external timing source or PLL lock time, simplifying PCB layout and reducing jitter-sensitive clock distribution paths. |
| Auto power-down between conversions | Reduces average power proportionally to sampling rate - e.g., 1000× lower current at 1 ksps vs. 1 Msps - ideal for duty-cycled sensor nodes. |
| SPI daisy-chain mode | Allows synchronous readout of multiple LTC2378IMS-20#PBF devices using single SCK/SDO lines, minimizing interconnect count in multi-channel DAQ systems. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
Use Scenario: Digitizing low-amplitude, high-frequency ultrasound echo signals in portable ultrasound machines. IC Role / Device Role / Timing Role: Primary 20-bit SAR ADC capturing baseband RF signals with 104 dB SNR and 34 MHz input bandwidth. Use Value: Enables detection of subtle tissue boundaries via high dynamic range, while DGC simplifies front-end amplifier design using single 5.5 V supply. | Use Scenario: Multi-channel synchronized waveform capture in automated test equipment (ATE) for semiconductor validation. IC Role / Device Role / Timing Role: High-throughput, low-latency ADC with daisy-chain SPI enabling precise inter-channel timing alignment. Use Value: 1 Msps throughput with zero cycle latency ensures accurate transient capture; MSOP-16 footprint supports dense channel packing. |
| Portable Instrumentation | Industrial Process Control |
Use Scenario: Battery-powered handheld spectrum analyzers requiring long runtime and high-resolution frequency-domain analysis. IC Role / Device Role / Timing Role: Low-power 20-bit ADC with adaptive power-down, delivering 104 dB SNR at 21 mW and scaling to 21 µW during idle periods. Use Value: Extends battery life without sacrificing resolution; 2.5 V supply and 1.8 V–5 V I/O support direct integration with modern low-voltage SoCs. | Use Scenario: Precision monitoring of analog sensor outputs (e.g., strain gauges, RTDs) in harsh factory environments. IC Role / Device Role / Timing Role: Industrial-grade ADC with −40°C to +85°C operation, ±2 ppm INL max, and robust ESD-protected inputs. Use Value: Maintains calibration stability across temperature extremes; fully differential inputs reject common-mode noise from motor drives and switching power supplies. |
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 |
|---|---|---|---|
| ADS127L01IPBSR | 24-bit delta-sigma ADC, 400 kSPS max, 113 dB SNR, external reference required, no DGC function. | Better resolution and SNR but lower speed; lacks integrated DGC and internal oscillator; requires external clock and reference buffer. | Select when ultra-low noise (<1 µV RMS) and highest DC accuracy outweigh speed and integration needs. |
| AD7626BCPZ-RL7 | 16-bit SAR ADC, 10 Msps, ±1.5 LSB INL, 91.5 dB SNR, 3.3 V supply, no DGC, SPI-only interface. | Higher speed but lower resolution and linearity; no DGC or internal clock; limited to 3.3 V I/O and 85°C max junction temperature. | Select when throughput >1 Msps is mandatory and 16-bit resolution suffices for the signal chain. |
Compared with ADS127L01IPBSR and AD7626BCPZ-RL7, the LTC2378IMS-20#PBF uniquely balances 20-bit resolution, 1 Msps speed, ±0.5 ppm INL, integrated DGC, and internal clock - making it optimal for portable, battery-constrained, and single-supply high-fidelity acquisition where both speed and precision are non-negotiable.
Availability
LTC2378IMS-20#PBF is available at Aetrix Electronics and suitable for medical imaging systems, portable instrumentation, and industrial process control applications requiring stable component supply, guaranteed −40°C to +85°C operation, and long-term production continuity.
Supply support for LTC2378IMS-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.
The LTC2378IMS-20#PBF belongs to ADI's precision SAR ADC product line, designed specifically for applications demanding high resolution, low power, and seamless integration - such as portable diagnostics, automated test equipment, and high-fidelity data loggers.
FAQ
What is the maximum sampling rate supported by the LTC2378IMS-20#PBF?
The LTC2378IMS-20#PBF supports a maximum sampling rate of 1 Msps with no pipeline delay or cycle latency. This is guaranteed over the full industrial temperature range (−40°C to +85°C) and requires CNV pulse period ≥1 µs. At this rate, conversion time is 675 ns max, leaving 325 ns for acquisition - sufficient for settling with properly designed input drive circuits.
Does the LTC2378IMS-20#PBF require an external clock source?
No, the LTC2378IMS-20#PBF does not require an external clock source. It incorporates an internal oscillator that sets the conversion timing, eliminating external clock dependencies and associated jitter concerns. The SCK signal is used solely for serial data transfer timing and may run up to 100 MHz - independent of conversion timing.
How does digital gain compression (DGC) work on the LTC2378IMS-20#PBF?
Digital gain compression (DGC) on the LTC2378IMS-20#PBF is enabled by tying the REF/DGC pin to GND. This remaps the full-scale input range from ±VREF to 0.1×VREF to 0.9×VREF, allowing the driving amplifier to operate from a single positive supply (e.g., 5.5 V) without negative rail. The ADC preserves full 20-bit resolution - only the digital output scaling changes, not the underlying quantization.
What package type and thermal characteristics apply to the LTC2378IMS-20#PBF?
The LTC2378IMS-20#PBF uses a 16-lead plastic MSOP package with θJA = 110°C/W. It operates from −40°C to +85°C ambient, with maximum junction temperature of 150°C. Unlike the DFN variant, the MSOP has no exposed pad; all four GND pins (3,6,10,16) must be soldered to PCB ground planes for thermal and electrical integrity.
Is the LTC2378IMS-20#PBF pin-compatible with other members of the LTC2378 family?
Yes, the LTC2378IMS-20#PBF shares identical pinout and functionality with LTC2378CMS-20#PBF (0°C to 70°C), LTC2378IDE-20#PBF (DFN, −40°C to +85°C), and LTC2378CDE-20#PBF (DFN, 0°C to 70°C). All variants use the same 16-pin configuration, register map, timing, and interface - differing only in temperature grade and package type (MSOP vs. DFN).
LTC2378IMS-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):
- 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-20#PBF FAQ
1.How can I place an order for LTC2378IMS-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2378IMS-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 LTC2378IMS-20#PBF reliable?
The price and inventory of LTC2378IMS-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 LTC2378IMS-20#PBF is usually 5 days.
3.What payment methods are accepted for LTC2378IMS-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2378IMS-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2378IMS-20#PBF?
LTC2378IMS-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2378IMS-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 LTC2378IMS-20#PBF?
For technical support, including LTC2378IMS-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2378IMS-20#PBF requirements.
6.How does Aetrix verify that LTC2378IMS-20#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2378IMS-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 LTC2378IMS-20#PBF meets industry standards.
7.What is the process for return or replacement of LTC2378IMS-20#PBF?
All LTC2378IMS-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2378IMS-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 LTC2378IMS-20#PBF part is unused and in its original packaging.
Return procedure for LTC2378IMS-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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