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Analog Devices Inc. LTC1865AHMS#PBF
- Part No.:
- LTC1865AHMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1865AHMS#PBF.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:848
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Product details
Overview
LTC1865AHMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with software-selectable 2-channel multiplexer, adjustable reference input, and SPI/MICROWIRE-compatible serial interface in a 10-lead MSOP package. It operates on a single 5V supply, draws only 850μA at full speed, and guarantees operation from –40°C to +125°C - ideal for high-precision, low-power industrial sensor data acquisition.
For engineers reviewing the LTC1865AHMS#PBF datasheet, LTC1865AHMS#PBF pinout, LTC1865AHMS#PBF application, or LTC1865AHMS#PBF equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and design-critical timing and accuracy specifications - all grounded in the official LTC1864/LTC1865 datasheet (18645fb).
Technical Context
The LTC1865AHMS#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting true differential or single-ended analog inputs via its 2-channel MUX. Its conversion cycle is initiated by a rising edge on CONV, completes in ≤3.3μs (H-grade), and automatically enters sleep mode (2μA) when CONV remains high between conversions.
It features a 10-lead MSOP package with separate AGND/DGND pins, supports external reference voltages from 1V to VCC, and uses full-duplex SPI communication: configuration bits are shifted in via SDI during CONV low, while conversion results shift out simultaneously on SDO synchronized to SCK falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-fidelity signal digitization. |
| Max Sampling Rate | 250ksps - enables capture of signals up to 125kHz full-linear bandwidth (S/(N+D) ≥ 75dB). |
| Supply Current @ 250ksps | 850μA typical - allows battery-powered operation with minimal thermal impact in compact systems. |
| INL Error (H-grade) | ±8.5 LSB max - ensures monotonicity and accurate end-point linearity across temperature. |
| SNR | 87dB - supports >14-bit effective resolution in noise-sensitive measurement applications. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive, industrial control, and harsh-environment monitoring. |
| Reference Input Range | 1V to VCC - permits flexible scaling (e.g., 1V full-scale for low-voltage sensors without gain stages). |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm), exposed pad not electrically connected, θJA = 210°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert Start Input | Rising edge initiates conversion; held high after completion forces auto-shutdown to 2μA sleep current. |
| CH0 / CH1 | Analog Input Channels | Software-selected MUX inputs for differential or single-ended measurements relative to AGND. |
| AGND | Analog Ground | Must be tied directly to analog ground plane; separates analog return path from digital switching noise. |
| DGND | Digital Ground | Provides clean return for SDO/SDI/SCK; recommended to tie to AGND at single point near device. |
| SDI | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges during CONV low; enables channel selection. |
| SDO | Serial Data Output | Outputs 16-bit result on falling SCK edges; tri-stated when CONV high or during setup. |
| SCK | Serial Clock Input | Up to 20MHz clock (H-grade); synchronizes full-duplex data transfer (SDI in / SDO out). |
| VCC | Positive Supply | Single 4.75V–5.25V supply; requires ≥1μF tantalum bypass to AGND close to pin. |
| VREF | Reference Input | Defines full-scale range (1V to VCC); must be low-noise and bypassed independently to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces supply current from 850μA @ 250ksps to 2μA @ 1ksps - extends battery life without firmware overhead. |
| Software-configurable 2-channel MUX | Enables dynamic channel selection (single-ended or differential) via 2-bit SDI command - eliminates external analog switches. |
| High-impedance analog inputs | Input leakage ±1μA max allows direct connection to high-Z sources (e.g., thermocouples, RTDs) without buffer amplifiers. |
| Guaranteed operation to +125°C | H-grade qualification ensures reliability in engine control units, motor drives, and industrial PLC modules. |
| True differential input capability | Rejects common-mode noise on CH0/CH1 pairs - critical for precision measurements in noisy EMI environments. |
Applications
| Industrial Sensor Interface | Portable Instrumentation |
|---|---|
|
Use Scenario: Digitizing outputs from strain gauges, pressure transducers, and RTDs in factory-floor monitoring systems. IC Role / Device Role / Timing Role: Precision 16-bit ADC with programmable MUX selects between multiple sensor channels; 250ksps sampling captures transient events in motor vibration analysis. Use Value: Eliminates external gain/level-shift circuitry due to 1V–5V reference flexibility and rail-to-rail input support - reducing BOM count and layout area. |
Use Scenario: Battery-powered handheld multimeters and environmental data loggers requiring long runtime and high accuracy. IC Role / Device Role / Timing Role: Low-power ADC core with auto-sleep mode; 850μA active current and 2μA standby enable multi-week operation on coin-cell batteries. Use Value: Integrated sample-and-hold and MUX reduce external component count versus discrete solutions - shrinking PCB size and assembly cost. |
| Isolated Data Acquisition | Automotive Engine Control |
|
Use Scenario: High-voltage isolation barriers in power quality analyzers where analog signals cross galvanic boundaries. IC Role / Device Role / Timing Role: ADC placed on field-side of isolator; differential inputs reject common-mode transients induced across isolation gap. Use Value: 87dB SNR and ±8.5 LSB INL ensure sub-0.01% measurement accuracy despite noisy isolated supply domains. |
Use Scenario: Monitoring exhaust gas oxygen (EGO) sensors and knock detection piezoelectric elements in engine management ECUs. IC Role / Device Role / Timing Role: AEC-Q100-qualified H-grade ADC operating reliably at 125°C ambient; MUX scans multiple cylinder-specific sensors. Use Value: Guaranteed –40°C to +125°C performance avoids derating or thermal margin loss - enabling smaller heatsinks and denser packaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI interface, but no internal MUX; requires external analog switch for multi-channel use. | Higher speed suits oscilloscope front-ends; lacks integrated MUX and auto-shutdown - less optimal for low-power scanning. | Select when sampling rate >250ksps is mandatory and channel count is fixed or externally managed. |
| MAX11100ETK+ | 16-bit, 250ksps, internal 8-channel MUX, but only rated to +85°C (I-grade) and consumes 1.5mA active current. | Broader channel count useful for data concentrators; higher power and lower temp grade limit use in under-hood locations. | Select for cost-sensitive, non-automotive applications needing >2 channels and acceptable 85°C max ambient. |
Compared with ADS8860IDRCT and MAX11100ETK+, the LTC1865AHMS#PBF uniquely combines guaranteed +125°C operation, integrated 2-channel MUX, and ultra-low 850μA active current - making it optimal for thermally constrained, multi-sensor industrial and automotive subsystems where power and reliability are co-prioritized.
Availability
LTC1865AHMS#PBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable instrumentation, and automotive engine control systems requiring stable component supply, extended temperature reliability, and long-term manufacturing continuity.
Supply support for LTC1865AHMS#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, renowned for high-performance data converters, power management, and signal conditioning ICs.
The LTC1864/LTC1865 family was designed specifically for compact, low-power, high-speed data acquisition in space- and energy-constrained systems - emphasizing integration (MUX, ref input), efficiency (auto-shutdown), and ruggedness (H-grade temp range).
FAQ
What is the maximum sampling frequency of the LTC1865AHMS#PBF?
The LTC1865AHMS#PBF achieves a maximum sampling frequency of 250ksps under H-grade conditions (–40°C to +125°C). This is confirmed in the "Timing Characteristics" table of the datasheet (18645fb, page 7), where fSMPL(MAX) is specified as 234kHz min and 250kHz typ for H-grade devices. The 250ksps rate enables full-linear bandwidth up to 125kHz while maintaining S/(N+D) ≥ 75dB.
Does the LTC1865AHMS#PBF require an external reference voltage?
No - the LTC1865AHMS#PBF supports both external and internal reference configurations. In the 10-lead MSOP package, VREF is a dedicated pin accepting 1V to VCC, allowing precise scaling. However, the SO-8 variant ties VREF internally to VCC. For LTC1865AHMS#PBF (MSOP), an external reference is optional but recommended for highest accuracy and flexibility.
How does the MUX function work on the LTC1865AHMS#PBF?
The LTC1865AHMS#PBF's 2-channel MUX is software-controlled via two bits shifted into SDI during the CONV low period. As defined in Table 1 (page 14), these bits select between four modes: single-ended CH0 or CH1 vs. differential CH0–CH1 or CH1–CH0. The selected configuration applies to the *next* conversion cycle - enabling dynamic channel sequencing without hardware reconfiguration.
What is the supply current of the LTC1865AHMS#PBF at 1ksps?
At 1ksps, the LTC1865AHMS#PBF draws only 2μA typical supply current. This ultra-low standby current is achieved through automatic power-down between conversions when CONV remains high - a key feature highlighted in the "Features" section (page 1) and verified in Figure G03 (page 8) of the datasheet. It enables years of operation on small batteries in intermittent-sampling applications.
Is the LTC1865AHMS#PBF pin-compatible with earlier 12-bit versions?
No - the LTC1865AHMS#PBF is not pin-compatible with 12-bit predecessors like the LTC1860/LTC1861. While those devices use 8-lead MSOP/SO packages, the LTC1865AHMS#PBF uses a 10-lead MSOP to accommodate separate AGND/DGND and SDI pins required for its 2-channel MUX and full-duplex SPI interface. Pin count, layout, and signal routing differ fundamentally.
LTC1865AHMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865AHMS#PBF FAQ
1.How can I place an order for LTC1865AHMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865AHMS#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 LTC1865AHMS#PBF reliable?
The price and inventory of LTC1865AHMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865AHMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865AHMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865AHMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865AHMS#PBF?
LTC1865AHMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865AHMS#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 LTC1865AHMS#PBF?
For technical support, including LTC1865AHMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865AHMS#PBF requirements.
6.How does Aetrix verify that LTC1865AHMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865AHMS#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 LTC1865AHMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865AHMS#PBF?
All LTC1865AHMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865AHMS#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 LTC1865AHMS#PBF part is unused and in its original packaging.
Return procedure for LTC1865AHMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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