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Analog Devices Inc. LTC1865AIMS#PBF
- Part No.:
- LTC1865AIMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1865AIMS#PBF.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:429
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Product details
Overview
LTC1865AIMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with integrated 2-channel software-selectable multiplexer and adjustable reference input, operating on a single 5V supply in a 10-lead MSOP package. It delivers 850μA typical supply current at full speed, auto-shutdown to 2μA at 1ksps, and supports true differential or single-ended analog inputs across –40°C to +85°C.
For engineers reviewing the LTC1865AIMS#PBF datasheet, LTC1865AIMS#PBF pinout, LTC1865AIMS#PBF application, or LTC1865AIMS#PBF equivalent, this page provides verified technical context, validated pin functions, real-world use cases for isolated data acquisition and portable instrumentation, and confirmed alternative options with documented functional and interface differences.
Technical Context
The LTC1865AIMS#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and a 2-bit serial configuration word accepted via SDI during CONV low. Its MUX supports four input configurations - single-ended CH0/GND, CH1/GND, or differential CH0–CH1, CH1–CH0 - selected dynamically before each conversion cycle.
It features SPI/MICROWIRE-compatible 3-wire serial I/O (SCK, SDO, SDI), CONV-triggered conversion timing with 3.2μs typical tCONV, and operates with external VREF from 1V to 5V in the MSOP variant. The 10-lead MSOP package separates AGND and DGND pins to minimize digital switching noise coupling into the analog path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic output and no missing codes over full temperature range. |
| Max Sampling Rate | 250ksps - enables high-speed acquisition of transients up to 125kHz full-linear bandwidth. |
| Supply Current | 850μA at 250ksps; drops to 2μA at 1ksps - enables battery operation with adaptive power management. |
| INL Error | ±8 LSB (max) - ensures <1 LSB integral linearity error across full scale for precision measurement. |
| SNR | 87 dB - supports >14 ENOB for clean signal digitization in low-noise sensor interfaces. |
| Reference Range | 1V to VCC (5V) - allows direct interfacing with low-voltage sensors without gain stages. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm), exposed pad not electrically connected; thermal resistance θJA = 210°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert control input | Rising edge initiates conversion; falling edge enables SDO and accepts 2-bit MUX config via SDI. |
| CH0 | Analog input channel 0 | Positive input for CH0–GND or CH0–CH1 differential modes; high-impedance (>1 GΩ) sampling node. |
| CH1 | Analog input channel 1 | Positive input for CH1–GND or negative input for CH0–CH1 mode; matched to CH0 for common-mode rejection. |
| AGND | Analog ground reference | Must connect directly to analog ground plane; separates analog return path from digital switching noise. |
| DGND | Digital ground reference | Connects to same ground plane as AGND at single point; isolates digital I/O return currents. |
| SDI | Serial data input | Accepts 2-bit MUX address (SGL/DIFF, ODD/SIGN) on rising SCK edges after CONV falls. |
| SDO | Serial data output | Outputs 16-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV high. |
| SCK | Serial clock input | Supports up to 20MHz clock (H-grade); synchronizes both SDI write and SDO read in full-duplex mode. |
| VCC | Positive supply | 4.75V to 5.25V single supply; requires ≥1μF tantalum bypass to AGND close to pin. |
| VREF | Reference voltage input | Defines full-scale range (1V to 5V); must be low-noise and bypassed independently to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Enables dynamic reconfiguration between four analog input combinations without hardware change. |
| Auto shutdown between conversions | Reduces average current to <1μA in low-duty-cycle systems, extending battery life in portable instruments. |
| True differential input capability | Rejects common-mode noise up to 125kHz bandwidth, critical for noisy industrial sensor front-ends. |
| 1V to 5V adjustable reference | Permits direct connection to low-output sensors (e.g., 1.2V thermopile outputs) without op-amp gain stages. |
| Guaranteed operation to +85°C | Validated performance across full industrial temperature range, eliminating derating concerns in embedded designs. |
Applications
| Portable Data Logger | Isolated Industrial Sensor Interface |
|---|---|
|
Use Scenario: Battery-powered environmental monitor acquiring temperature, humidity, and pressure from multiple analog sensors. IC Role / Device Role / Timing Role: Central 16-bit ADC performing time-multiplexed sampling of 2 sensor channels with programmable gain-free scaling. Use Value: 250ksps throughput and 850μA active current enable 24-hour operation on a single AA cell while maintaining 14-bit effective resolution. |
Use Scenario: DIN-rail mounted PLC module measuring 4–20mA current loops and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Isolated-side ADC converting differential sensor outputs with high CMRR and rail-to-rail input flexibility. Use Value: Adjustable 1V–5V VREF and true differential inputs eliminate external level-shifting circuitry, reducing BOM count by 3 components per channel. |
| Medical Vital Sign Monitor | Automotive Onboard Diagnostics (OBD) |
|
Use Scenario: Wearable ECG patch digitizing biopotential signals with ultra-low power consumption and minimal board space. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing lead-I/II/III differential ECG waveforms at 250Hz–1kHz effective rate. Use Value: 87dB SNR and ±8 LSB INL ensure diagnostic-grade waveform fidelity; MSOP-10 footprint fits sub-2cm² wearable PCBs. |
Use Scenario: Aftermarket OBD-II scanner reading analog engine parameters (coolant temp, throttle position, O2 sensor) via vehicle's analog test points. IC Role / Device Role / Timing Role: Dual-channel ADC sampling multiple 0–5V automotive sensor outputs with configurable single-ended/differential modes. Use Value: –40°C to +85°C rating ensures reliable operation under hood; software MUX eliminates need for external analog switches. |
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-only interface, no internal MUX, 1.8V–3.6V supply only. | Requires external MUX and level-shifting for 5V systems; better suited for high-speed, low-voltage portable designs. | Select when sampling rate >250ksps is required and system uses 3.3V logic; not drop-in due to supply and pinout mismatch. |
| MAX11100ETE+ | 16-bit, 250ksps, integrated PGA (0.5x–16x), SPI interface, 2.7V–3.6V supply. | Includes programmable gain amplifier but lacks dual-channel MUX; optimized for low-amplitude sensor signals. | Choose when amplification is needed before digitization; incompatible with 5V systems and requires different reference handling. |
Compared with ADS8860IDRCT and MAX11100ETE+, the LTC1865AIMS#PBF uniquely combines 5V single-supply operation, integrated 2-channel MUX, and industrial temperature range in a compact MSOP-10 - making it optimal for cost-sensitive, space-constrained 5V industrial and automotive data acquisition where flexible analog routing is essential.
Availability
LTC1865AIMS#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated sensor interfaces, and automotive diagnostics requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LTC1865AIMS#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1865AIMS#PBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for low-power, high-resolution industrial and portable measurement systems where accuracy, size, and supply simplicity are critical.
FAQ
What is the maximum clock frequency supported by LTC1865AIMS#PBF for reliable SPI communication?
The LTC1865AIMS#PBF supports up to 20MHz SCK frequency in H-grade versions; however, the standard LTC1865AIMS#PBF (industrial grade) is specified for 16.7MHz maximum clock frequency under full temperature range conditions. This ensures robust timing margins for setup/hold requirements of SDI and SDO signals across –40°C to +85°C, and aligns with the 250ksps sampling limit. Exceeding 16.7MHz may violate tdDO or thDO specifications.
Does LTC1865AIMS#PBF require an external reference, or can it use VCC as reference?
The LTC1865AIMS#PBF in the 10-lead MSOP package requires an external reference applied to the VREF pin, which can be set from 1V to VCC (5V). Unlike the SO-8 version of LTC1865, the MSOP variant does not internally tie VREF to VCC - so VCC cannot serve as the reference unless explicitly routed to VREF with appropriate decoupling. Using VCC directly risks noise coupling and degraded SNR.
How does the MUX configuration work on LTC1865AIMS#PBF, and when is it latched?
The LTC1865AIMS#PBF accepts a 2-bit configuration word (SGL/DIFF and ODD/SIGN) on the SDI pin during the first two SCK rising edges after CONV falls. This word selects one of four input modes: CH0–GND, CH1–GND, CH0–CH1, or CH1–CH0. The configuration is latched at the end of that 2-bit transfer and applies to the *next* conversion triggered by the subsequent CONV rising edge - enabling deterministic pre-conversion setup.
What is the absolute maximum input voltage range for CH0 and CH1 on LTC1865AIMS#PBF?
Per Absolute Maximum Ratings, the analog input pins CH0 and CH1 on LTC1865AIMS#PBF tolerate voltages from (AGND – 0.3V) to (VCC + 0.3V), i.e., –0.3V to +5.3V with 5V supply. However, the functional input range is limited to 0V to VREF for single-ended modes, or ±VREF for differential modes. Exceeding VREF risks code saturation and increased INL error, even if within absolute max limits.
Can LTC1865AIMS#PBF operate with a 3.3V supply instead of 5V?
No - the LTC1865AIMS#PBF is specified only for 4.75V to 5.25V supply operation. Its internal reference buffer, charge redistribution DAC, and digital core are designed for 5V logic levels and biasing. Operating at 3.3V violates Recommended Operating Conditions and will cause failure to meet AC specs (e.g., SNR, THD) and DC specs (e.g., offset, gain error), and may prevent proper CONV or SCK recognition.
LTC1865AIMS#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 ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865AIMS#PBF FAQ
1.How can I place an order for LTC1865AIMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865AIMS#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 LTC1865AIMS#PBF reliable?
The price and inventory of LTC1865AIMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865AIMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865AIMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865AIMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865AIMS#PBF?
LTC1865AIMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865AIMS#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 LTC1865AIMS#PBF?
For technical support, including LTC1865AIMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865AIMS#PBF requirements.
6.How does Aetrix verify that LTC1865AIMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865AIMS#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 LTC1865AIMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865AIMS#PBF?
All LTC1865AIMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865AIMS#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 LTC1865AIMS#PBF part is unused and in its original packaging.
Return procedure for LTC1865AIMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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