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Analog Devices Inc. LTC2368HMS-18#PBF
- Part No.:
- LTC2368HMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2368HMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,287
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Product details
Overview
LTC2368HMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1 Msps pseudo-differential unipolar successive approximation register (SAR) ADC operating from a single 2.5V supply. It delivers 97 dB SNR (typ), ±2.5 LSB INL (max), and guaranteed no missing codes across its 0 V to VREF input range (VREF = 2.5 V to 5.1 V), targeting high-precision, high-speed data acquisition in thermally demanding environments up to +125°C.
For engineers reviewing the LTC2368HMS-18#PBF datasheet, LTC2368HMS-18#PBF pinout, LTC2368HMS-18#PBF application, or LTC2368HMS-18#PBF equivalent, key selection considerations include its H-grade temperature rating (–40°C to +125°C), daisy-chain SPI interface compatibility with 1.8 V–5 V logic, internal conversion clock eliminating external timing constraints, and auto power-down reducing dissipation to 13.5 µW at 1 kSPS.
Technical Context
The LTC2368HMS-18#PBF employs a charge redistribution capacitor DAC (CDAC) architecture with pseudo-differential sampling, where IN+ accepts 0 V to VREF signals while IN– serves as a ground-sense node (±100 mV range). Conversion is initiated by a rising edge on CNV, with no pipeline delay and fixed 460 ns conversion time set by an internal oscillator.
Its SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as SDI when CHAIN = HIGH), enabling multi-ADC synchronization without additional control lines. Digital I/O operates independently from analog VDD via OVDD (1.71 V–5.25 V), allowing seamless interfacing with mixed-voltage host systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - delivers 262,144 discrete output levels for ultra-fine signal quantization. |
| Sampling Rate | 1 Msps - enables real-time capture of fast transients in industrial control and ATE. |
| SNR | 97 dB (typ, fIN = 2 kHz, VREF = 5 V) - ensures high dynamic range for low-amplitude signal fidelity. |
| INL | ±2.5 LSB (max) - guarantees monotonicity and linearity critical for closed-loop feedback accuracy. |
| Power Dissipation | 13.5 mW at 1 Msps - balances speed and efficiency for battery-constrained portable instrumentation. |
| Operating Temperature | –40°C to +125°C - validated for under-hood automotive, downhole oil & gas, and industrial motor drive applications. |
| Reference Range | 2.5 V to 5.1 V - allows flexible full-scale scaling using precision references like LTC6655-5. |
Pinout & Package
Package: 16-lead plastic MSOP (small-outline package), 4.0 mm × 3.0 mm footprint, exposed pad not present (DFN variant has exposed pad; MSOP does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High = daisy-chain mode (RDL/SDI becomes SDI); Low = normal mode (RDL/SDI enables SDO). |
| VDD (2) | Analog supply | 2.5 V ± 125 mV; powers core ADC and reference buffer; requires 10 µF ceramic bypass to GND. |
| GND (3,6,10,16) | Ground return | Four dedicated analog/digital GND pins minimize ground bounce and improve noise immunity. |
| IN+ (4) | Pseudo-differential input | Accepts 0 V to VREF unipolar signal; sampled against IN–; sees 45 pF capacitance during acquisition. |
| IN– (5) | Ground sense node | ±100 mV range relative to GND; must connect to system ground plane or remote sense point. |
| REF (7,8) | Reference input | Dual-pin connection for low-impedance decoupling; requires 47 µF X5R ceramic capacitor close to pins. |
| CNV (9) | Convert trigger | Rising-edge–initiated conversion; also powers up device from auto power-down state. |
| BUSY (11) | Status indicator | Active-high open-drain output signaling ongoing conversion; used for timing synchronization. |
| RDL/SDI (12) | Configurable I/O | Bus enable (CHAIN = LOW) or serial data input (CHAIN = HIGH); level referenced to OVDD. |
| SCK (13) | Serial clock | Up to 100 MHz SCK frequency; rising-edge–driven; controls data shift-out timing for SDO. |
| SDO (14) | Serial data output | MSB-first straight binary output; tri-state controlled by RDL/SDI in normal mode. |
| OVDD (15) | I/O supply | 1.71 V–5.25 V digital interface supply; enables direct connection to 1.8 V, 2.5 V, 3.3 V, or 5 V logic. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 18 bits | Guaranteed monotonic transfer function eliminates code ambiguities in closed-loop control systems. |
| No cycle latency | Immediate data availability after BUSY goes low-enables deterministic real-time processing without FIFO buffering. |
| Internal conversion clock | Eliminates need for external timing circuitry; simplifies PCB layout and reduces BOM count in space-constrained designs. |
| Auto power-down between conversions | Reduces average power proportionally to sampling rate-13.5 µW at 1 kSPS extends battery life in portable test equipment. |
| 1.8 V–5 V I/O voltage support | Interoperability with legacy and next-gen microcontrollers/FPGAs without level-shifting components. |
Applications
| Medical Imaging Signal Chain | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-noise analog outputs from CT/MRI detector front-ends requiring high resolution and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 18-bit samples at 1 Msps with 97 dB SNR to preserve image contrast and spatial fidelity. Use Value: Enables detection of sub-1% density variations in tissue imaging due to guaranteed no missing codes and ±2.5 LSB INL. | Use Scenario: High-accuracy temperature, pressure, and flow sensing in refinery control cabinets exposed to ambient temperatures up to +125°C. IC Role / Device Role / Timing Role: Precision analog-to-digital conversion in distributed I/O modules with extended temperature operation and robust ESD-tolerant inputs. Use Value: Eliminates thermal recalibration cycles thanks to <0.15 ppm/°C full-scale drift and –40°C to +125°C guaranteed performance. |
| Portable Battery-Powered Test Equipment | Automated Test Equipment (ATE) |
Use Scenario: Handheld oscilloscopes and spectrum analyzers requiring long runtime without compromising dynamic range. IC Role / Device Role / Timing Role: Core ADC delivering 18-bit resolution at 1 Msps while consuming only 13.5 mW, with automatic power-down during idle periods. Use Value: Extends battery life by >10× versus comparable ADCs through adaptive power gating synchronized to sample triggers. | Use Scenario: Parallel channel digitization in semiconductor wafer probers and board-level functional testers needing synchronized multi-ADC acquisition. IC Role / Device Role / Timing Role: Daisy-chain–configured ADC providing deterministic, low-latency sampling across 4–16 channels with shared SCK and BUSY signals. Use Value: Reduces inter-channel skew to <1 ns and eliminates per-channel clock distribution complexity. |
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 |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, 99 dB SNR (typ), requires external reference and separate VDRIVE supply; no integrated daisy-chain mode. | Higher throughput but higher power (43 mW at 5 Msps); suited for benchtop instruments over portable units. | Select when maximum speed outweighs power budget and daisy-chain simplicity. |
| ADS8860IDRCT | 16-bit, 1 Msps, 92 dB SNR (typ), SPI-only interface, 1.8 V–3.6 V OVDD range only; no H-grade option. | Limited to commercial temperature range (–40°C to +85°C); lower resolution acceptable for cost-sensitive industrial sensors. | Select when 16-bit resolution suffices and extended temperature operation is not required. |
Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2368HMS-18#PBF uniquely combines H-grade temperature support, integrated daisy-chain capability, and 13.5 mW power at 1 Msps-making it optimal for ruggedized, multi-channel, battery-aware systems where reliability and layout simplicity are prioritized over peak speed or lowest cost.
Availability
LTC2368HMS-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process monitoring systems, and portable battery-powered test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2368HMS-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 LTC2368 family was designed specifically for high-accuracy, low-power, high-speed data acquisition in thermally challenging environments-emphasizing guaranteed specifications across –40°C to +125°C, internal timing autonomy, and robust pseudo-differential input architecture.
FAQ
What is the maximum operating temperature of the LTC2368HMS-18#PBF?
The LTC2368HMS-18#PBF is rated for continuous operation from –40°C to +125°C (H-grade), with all electrical specifications-including INL, SNR, and power consumption-guaranteed across this full range. This makes the LTC2368HMS-18#PBF suitable for under-hood automotive, downhole, and industrial motor control applications where ambient temperatures exceed standard commercial or industrial grades.
Does the LTC2368HMS-18#PBF require an external clock source?
No, the LTC2368HMS-18#PBF integrates an internal oscillator that sets the conversion time (460 ns typ), eliminating the need for an external clock source. The SCK pin is used solely for serial data transfer timing and can operate up to 100 MHz; it does not control conversion initiation or duration. This simplifies system design and improves timing robustness in noisy environments.
How does the pseudo-differential input architecture of the LTC2368HMS-18#PBF differ from true differential inputs?
The LTC2368HMS-18#PBF uses a pseudo-differential input where IN+ accepts 0 V to VREF, and IN– serves as a ground-sense node (±100 mV range), not a complementary signal path. This architecture rejects common-mode noise while maintaining unipolar input range and simplifying driver design-unlike true differential SAR ADCs that require matched complementary signals and offer bipolar input capability.
Can the LTC2368HMS-18#PBF interface directly with a 1.8 V microcontroller?
Yes-the LTC2368HMS-18#PBF supports OVDD from 1.71 V to 5.25 V, enabling direct SPI communication with 1.8 V logic without level shifters. When OVDD = 1.8 V, VIH = 1.44 V (min) and VIL = 0.36 V (max) ensure reliable signal recognition, and SDO output swing remains compatible with 1.8 V CMOS inputs.
What reference voltage sources are recommended for use with the LTC2368HMS-18#PBF?
Analog Devices recommends the LTC6655-5 for the LTC2368HMS-18#PBF: a 5 V precision reference with 0.025% initial accuracy, 2 ppm/°C max tempco, and full specification over –40°C to +125°C. Its low noise and fast settling match the LTC2368HMS-18#PBF's 97 dB SNR and burst-sampling transient requirements, and it pairs seamlessly with the 47 µF X5R ceramic capacitor specified at the REF pins.
LTC2368HMS-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:
- Pseudo-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 ~ 125°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2368HMS-18#PBF FAQ
1.How can I place an order for LTC2368HMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2368HMS-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 LTC2368HMS-18#PBF reliable?
The price and inventory of LTC2368HMS-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 LTC2368HMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2368HMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2368HMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2368HMS-18#PBF?
LTC2368HMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2368HMS-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 LTC2368HMS-18#PBF?
For technical support, including LTC2368HMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2368HMS-18#PBF requirements.
6.How does Aetrix verify that LTC2368HMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2368HMS-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 LTC2368HMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2368HMS-18#PBF?
All LTC2368HMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2368HMS-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 LTC2368HMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2368HMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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