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Analog Devices Inc. LTC1865HMS#PBF
- Part No.:
- LTC1865HMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1865HMS#PBF.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,385
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Product details
Overview
LTC1865HMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with integrated 2-channel software-selectable MUX and adjustable reference input, housed in a 10-lead MSOP package operating on a single 5V supply. It delivers 850μA typical supply current at full speed, auto-shutdown to 2μA at 1ksps, and guaranteed operation from –40°C to +125°C - ideal for high-precision, low-power industrial sensor interfaces.
For engineers reviewing the LTC1865HMS#PBF datasheet, LTC1865HMS#PBF pinout, LTC1865HMS#PBF application, or LTC1865HMS#PBF equivalent, key selection criteria include its true differential input architecture, SPI/MICROWIRE-compatible serial interface, 87dB SNR, ±8 LSB INL (H-grade), and MSOP-10 thermal performance (θJA = 210°C/W) for compact, thermally constrained designs.
Technical Context
The LTC1865HMS#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential input configurations via a 2-bit SDI control word. Its conversion timing is deterministic: tCONV = 2.75–3.3 μs (H-grade), synchronized by external SCK up to 20 MHz.
It features dual ground pins (AGND and DGND), separate analog/digital power domains, and a programmable reference input (1V to VCC) - enabling ratiometric measurements, reduced-span operation down to 1V full-scale, and direct connection to low-output-impedance sensors without gain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high dynamic range measurement |
| Max Sampling Rate | 250 ksps - supports real-time acquisition of signals up to 125 kHz full linear bandwidth |
| Supply Current | 850 μA typ at 250 ksps; drops to 2 μA at 1 ksps - enables battery-powered operation with adaptive power management |
| INL (H-grade) | ±8 LSB - ensures monotonicity and <1 LSB linearity error over full temperature range (–40°C to +125°C) |
| SNR | 87 dB - provides >14-bit effective resolution for precision DC and low-frequency AC measurements |
| Reference Range | 1V to VCC (5V) - allows flexible scaling for sensor outputs, including 1V–5V ratiometric or external reference use |
| Full Power BW | 20 MHz - supports accurate sampling of fast transients and wideband signals without aliasing |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm, 0.5mm pitch), θJA = 210°C/W, rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert Input | Active-high trigger initiating conversion; held high after completion forces auto-shutdown mode |
| CH0 / CH1 | Analog Input Channels | Software-multiplexed inputs for differential or single-ended measurement; referenced to AGND |
| AGND | Analog Ground | Dedicated low-noise return path for analog circuitry; must connect directly to analog ground plane |
| DGND | Digital Ground | Separate return for digital I/O; tied to AGND at single point to minimize noise coupling |
| SDI | Serial Data Input | Accepts 2-bit MUX configuration word on rising SCK edges before conversion begins |
| SDO | Serial Data Output | 16-bit result shifted out MSB-first on falling SCK edges; tri-stated when CONV is high |
| SCK | Serial Clock Input | Synchronizes full-duplex data transfer; supports up to 20 MHz clock frequency (H-grade) |
| VCC | Positive Supply | Single 4.75V–5.25V rail powering analog and digital sections; requires local 1μF bypass to AGND |
| VREF | Reference Input | Defines full-scale span (1V–5V); high-impedance input requiring low-noise, low-impedance source |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces average current to ~2μA at 1ksps - extends battery life in intermittent-sampling systems |
| True differential input architecture | Rejects common-mode noise on CH0/CH1 pairs - improves accuracy in electrically noisy industrial environments |
| 10-lead MSOP package with extended temp range | Enables high-density PCB layouts while maintaining reliability in under-hood or factory-floor applications |
| 16-bit upgrade path from 12-bit LTC1860/LTC1861 | Preserves existing board layout and firmware structure - simplifies precision upgrade without redesign |
| Guaranteed operation to +125°C | Validated performance across full H-grade temperature range - eliminates derating concerns in harsh thermal environments |
Applications
| High-Speed Industrial Sensor Interface | Isolated Remote Data Acquisition |
|---|---|
Use Scenario: Monitoring strain gauges and RTDs in PLC analog input modules with 200+ channel density and ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary 16-bit digitizer acquiring synchronized multi-channel readings at 250ksps aggregate rate using software MUX sequencing. Use Value: 87dB SNR and ±8 LSB INL ensure <0.01% measurement uncertainty over full industrial temperature range without calibration drift compensation. | Use Scenario: Distributed temperature and pressure sensing in oil & gas wellhead controllers located 100m from central processing unit, powered via 4–20mA loop. IC Role / Device Role / Timing Role: Local ADC converting sensor outputs to digital before isolation barrier; operates from local LDO derived from loop power. Use Value: 1V–5V reference flexibility allows direct interfacing with loop-powered signal conditioners; 2μA sleep current minimizes quiescent load on 4–20mA supply. |
| Portable Battery-Powered Test Equipment | Automotive Engine Control Unit (ECU) Diagnostics |
Use Scenario: Handheld multimeter or oscilloscope probe with dual-channel voltage/current measurement and 8-hour battery life. IC Role / Device Role / Timing Role: Dual-input ADC sampling analog front-end at variable rates (1ksps–250ksps) with automatic power scaling per acquisition mode. Use Value: Auto-shutdown reduces average current from 850μA to <5μA during idle - enabling long runtime without compromising full-speed burst capability. | Use Scenario: On-board diagnostic subsystem capturing crankshaft position, knock sensor, and intake manifold pressure waveforms during engine cranking. IC Role / Device Role / Timing Role: High-reliability ADC sampling critical analog signals at 250ksps with guaranteed operation at –40°C to +125°C junction temperature. Use Value: H-grade qualification and 210°C/W thermal resistance ensure stable performance inside ECU housing without forced cooling or thermal derating. |
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, 1.8V–3.6V supply only; no internal MUX; lower power (0.5mW at 100kSPS) | Requires level-shifting for 5V systems; lacks software-configurable dual-channel MUX | Select when higher speed and ultra-low power are prioritized over 5V compatibility and integrated MUX functionality |
| MAX11166ETK+ | 16-bit, 500kSPS, SPI, 2.7V–3.6V supply; integrated PGA (0.5x–16x); no MUX | Not pin-compatible; requires external signal conditioning for 5V-range inputs | Choose when programmable gain amplification is needed for microvolt-level sensor signals, not fixed-ratio industrial sensors |
Compared with ADS8860IDRCT and MAX11166ETK+, the LTC1865HMS#PBF uniquely combines 5V single-supply operation, integrated 2-channel MUX, and guaranteed +125°C performance - making it the only option among the three qualified for uncooled industrial and automotive under-hood deployments without voltage translation or external multiplexing.
Availability
LTC1865HMS#PBF is available at Aetrix Electronics and suitable for high-reliability industrial sensor interfaces, isolated remote data acquisition nodes, and automotive ECU diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1865HMS#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 LTC1865HMS#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for low-power, high-accuracy measurement in thermally demanding environments where reliability and long-term parametric stability are critical.
FAQ
What is the maximum sampling frequency of the LTC1865HMS#PBF at its highest temperature rating?
The LTC1865HMS#PBF maintains a maximum sampling frequency of 250 ksps across its full H-grade operating temperature range of –40°C to +125°C. This is explicitly specified in the "Recommended Operating Conditions" table for H-grade devices, with a minimum guaranteed value of 234 ksps at +125°C - ensuring deterministic real-time performance in high-temperature industrial and automotive applications without speed degradation.
Does the LTC1865HMS#PBF require an external reference voltage, or can it operate with VCC as reference?
The LTC1865HMS#PBF requires an external reference voltage applied to the VREF pin and cannot use VCC as reference. Unlike the SO-8 version of the LTC1865, the MSOP package (including LTC1865HMS#PBF) has a dedicated VREF pin that accepts 1V to VCC (5V) - enabling precise ratiometric or absolute measurements. Tying VREF directly to VCC is not supported and would violate the specified reference input range and noise requirements.
How does the software-selectable MUX in the LTC1865HMS#PBF function during conversion?
The LTC1865HMS#PBF uses a 2-bit configuration word shifted into the SDI pin on rising SCK edges *after* CONV goes low but *before* conversion starts. This word selects one of four input modes (single-ended CH0/GND, CH1/GND, or differential CH0–CH1, CH1–CH0) for the upcoming conversion cycle. The MUX state is latched internally and remains fixed for that conversion - enabling deterministic, software-controlled channel routing without external hardware switches.
What is the meaning of "H-grade" in LTC1865HMS#PBF, and how does it affect INL specification?
"H-grade" denotes the highest temperature grade for the LTC1865HMS#PBF, guaranteeing full electrical specifications from –40°C to +125°C ambient. For INL, this means the device is tested and warranted to ±8 LSB over that entire range - a tighter tolerance than the standard I-grade (±8.5 LSB) and significantly better than C-grade (±6 LSB at 25°C only). This ensures consistent linearity in uncooled enclosures or high-ambient environments.
Can the LTC1865HMS#PBF be used with a 3.3V microcontroller SPI interface without level shifting?
No - the LTC1865HMS#PBF is a 5V-only device with VIH = 2.4V min and VIL = 0.8V max, but its digital I/O pins (SDI, SDO, SCK, CONV) are not 3.3V-tolerant when VCC = 5V. Driving these pins with 3.3V logic violates the absolute maximum rating for digital input voltage (7V max) but risks violating the recommended operating condition for VIL/VIH margins and may cause unreliable communication. Level shifting is required for robust interoperability with 3.3V controllers.
LTC1865HMS#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:
- -
LTC1865HMS#PBF FAQ
1.How can I place an order for LTC1865HMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865HMS#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 LTC1865HMS#PBF reliable?
The price and inventory of LTC1865HMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865HMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865HMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865HMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865HMS#PBF?
LTC1865HMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865HMS#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 LTC1865HMS#PBF?
For technical support, including LTC1865HMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865HMS#PBF requirements.
6.How does Aetrix verify that LTC1865HMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865HMS#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 LTC1865HMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865HMS#PBF?
All LTC1865HMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865HMS#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 LTC1865HMS#PBF part is unused and in its original packaging.
Return procedure for LTC1865HMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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