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Analog Devices Inc. LTC1865AIMS#TRPBF
- Part No.:
- LTC1865AIMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1865AIMS#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
LTC1865AIMS#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps, software-selectable dual-channel successive approximation ADC in a 10-lead MSOP package, operating on a single 5V supply with 850μA typical supply current. It features true differential analog inputs per channel, adjustable external reference input (1V to VCC), SPI/MICROWIRE-compatible 3-wire serial interface, and auto-shutdown between conversions - enabling high-resolution data acquisition in battery-powered portable instrumentation.
For engineers reviewing the LTC1865AIMS#TRPBF datasheet, LTC1865AIMS#TRPBF pinout, LTC1865AIMS#TRPBF application, or LTC1865AIMS#TRPBF equivalent, key selection criteria include its guaranteed –40°C to +85°C industrial temperature range, 10-lead MSOP footprint with separate AGND/DGND pins, 2-channel MUX control via SDI, and compatibility with low-noise analog front-ends for isolated sensor interfaces.
Technical Context
The LTC1865AIMS#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential input configurations via a 2-bit SDI-configurable multiplexer. Its conversion timing is synchronized to CONV rising edge, with tCONV ≤ 3.3μs (H-grade) and full-duplex serial data transfer enabled by SCK.
It operates with independent analog and digital ground planes (AGND/DGND), requires 1μF tantalum bypassing on VCC and VREF, and supports ratiometric operation or external references down to 1V full-scale - enabling direct connection to transducer outputs without gain stages while maintaining 87dB SNR and ±8 LSB INL over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct output codes for high-precision measurement of small signal variations. |
| Max Sampling Rate | 250ksps - supports real-time capture of signals up to 125kHz full-linear bandwidth (S/(N+D) ≥ 75dB). |
| Supply Current | 850μA at 250ksps - enables compact, low-power designs; drops to 2μA at 1ksps via auto-shutdown. |
| INL Error | ±8 LSB (max) - ensures monotonicity and accurate end-point linearity across full industrial temperature range. |
| Signal-to-Noise Ratio | 87dB - provides >14-bit effective resolution for clean DC and low-frequency AC measurements. |
| Reference Range | 1V to VCC (5V) - allows flexible scaling for sensors with sub-5V output spans without external regulators. |
| Operating Temp | –40°C to +85°C - qualified for industrial embedded systems where ambient thermal stress is present. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), exposed pad not electrically connected; θJA = 210°C/W; RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert Control Input | Active-high trigger starts conversion; held high after completion forces auto-shutdown mode. |
| CH0 | Analog Input Channel 0 (+) | Differential or single-ended input; referenced to CH1 or GND per SDI configuration. |
| CH1 | Analog Input Channel 1 (–) | Complementary input for CH0 in differential mode; grounded for single-ended CH0 measurement. |
| AGND | Analog Ground Reference | Must connect directly to low-impedance analog ground plane to minimize noise coupling into sampling circuitry. |
| DGND | Digital Ground Reference | Separate return path for serial interface; tied to AGND at single point to prevent digital switching noise injection. |
| SDI | Serial Data Input | Receives 2-bit MUX configuration word on falling edge of first SCK after CONV↓; full-duplex operation. |
| SDO | Serial Data Output | Outputs 16-bit conversion result MSB-first on falling SCK edge; tri-stated when CONV is high. |
| SCK | Serial Clock Input | Drives synchronous full-duplex data transfer; max frequency 20MHz (H-grade), 16.7MHz (standard). |
| VCC | Positive Supply | Single 4.75V–5.25V rail powers analog and digital sections; requires local 1μF bypass to AGND. |
| VREF | Reference Voltage Input | Defines full-scale span (1V–5V); must be low-noise and bypassed; not internally tied to VCC (MSOP version). |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Configurable via SDI bits to support four input modes: CH0–CH1, CH0–GND, CH1–GND, CH1–CH0 - eliminating external analog switches. |
| True Differential Input Architecture | Rejects common-mode noise on paired inputs (e.g., thermocouple, bridge sensor outputs) without requiring matched external resistors. |
| Auto-Power-Down Between Conversions | Reduces average current to ~2μA at 1ksps - extends battery life in intermittent-sampling applications like environmental monitors. |
| Guaranteed Operation to +85°C | Specified performance (INL, SNR, tCONV) maintained across full industrial temperature range - no derating required. |
| High-Z Analog Inputs with Low Leakage | ±1μA max input leakage and 12pF sample-mode capacitance enable direct connection to high-impedance sources (e.g., pH electrodes, piezoresistive sensors). |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure every 10 seconds using MEMS and analog-output sensors. IC Role / Device Role / Timing Role: LTC1865AIMS#TRPBF digitizes multiple sensor outputs sequentially via its 2-channel MUX, with auto-shutdown minimizing quiescent power between samples. Use Value: 850μA active current and 2μA sleep current extend AA battery life beyond 2 years; 16-bit resolution captures subtle drift in calibrated sensor outputs. | Use Scenario: PLC analog input module conditioning 4–20mA current-loop signals from flow meters and level transmitters. IC Role / Device Role / Timing Role: LTC1865AIMS#TRPBF serves as the precision front-end ADC, accepting differential inputs from isolated current-sense amplifiers. Use Value: ±8 LSB INL and 87dB SNR ensure <0.05% total unadjusted error over –40°C to +85°C; separate AGND/DGND pins suppress digital noise coupling. |
| Isolated Medical Sensors | Remote Condition Monitoring |
Use Scenario: Wireless ECG patch acquiring biopotential signals through shielded electrode leads with galvanic isolation. IC Role / Device Role / Timing Role: LTC1865AIMS#TRPBF performs low-noise, high-common-mode-rejection sampling of differential electrode pairs before RF transmission. Use Value: True differential inputs reject 50/60Hz mains interference; 1V–5V reference flexibility accommodates low-voltage isolated power rails. | Use Scenario: Smart grid transformer monitoring unit measuring voltage/current harmonics via Rogowski coils and CTs at remote substations. IC Role / Device Role / Timing Role: LTC1865AIMS#TRPBF digitizes isolated analog outputs from current/voltage sensors synchronized to a master clock. Use Value: 250ksps sampling captures 50th harmonic (2.5kHz) with Nyquist margin; SPI interface simplifies FPGA-based data aggregation. |
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, single-channel, SPI interface; 1.8V–3.6V supply; no internal MUX; lower power (500μA @ 100ksps). | Requires external MUX for multi-channel use; optimized for ultra-low-voltage systems; lacks industrial temp grade. | Select when higher speed and lower supply voltage are critical, and channel count is fixed or externally managed. |
| AD7682BRMZ | 16-bit, 250ksps, 4-channel pseudo-differential SAR ADC; 2.3V–5.5V supply; no VREF pin (internal reference only); SPI interface. | Fixed 4-channel count; no external reference flexibility; higher typical supply current (1.2mA @ 250ksps); wider temp range (–40°C to +125°C). | Select when more channels are needed and external reference control is not required; verify internal 2.5V ref meets system accuracy needs. |
Compared with ADS8860IDRCT and AD7682BRMZ, the LTC1865AIMS#TRPBF uniquely combines software-configurable dual-channel MUX, 1V–5V external reference support, and guaranteed industrial temperature performance in a compact 10-lead MSOP - making it optimal for space-constrained, multi-sensor, battery-operated systems requiring design flexibility.
Availability
LTC1865AIMS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and isolated medical devices requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LTC1865AIMS#TRPBF 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 LTC1865AIMS#TRPBF belongs to Linear Technology's precision data acquisition product line, designed specifically for low-power, high-resolution measurement in space- and energy-constrained embedded systems - emphasizing robustness, ease of layout, and guaranteed specifications across temperature.
FAQ
What is the maximum sampling rate of the LTC1865AIMS#TRPBF, and under what conditions is it specified?
The LTC1865AIMS#TRPBF achieves a maximum sampling rate of 250ksps, specified under recommended operating conditions: VCC = 4.75V to 5.25V, fSCK ≤ 20MHz (H-grade), and TA = –40°C to +85°C. This rate is sustained with full 16-bit resolution and guaranteed INL performance; actual achievable rate depends on SCK frequency and CONV timing constraints per the datasheet's timing diagram.
Does the LTC1865AIMS#TRPBF require an external reference, or can it operate with an internal one?
The LTC1865AIMS#TRPBF requires an external reference applied to the VREF pin - it has no internal reference. The MSOP version supports VREF from 1V to VCC (5V), enabling flexible scaling for low-voltage sensors. Unlike the SO-8 variant, the MSOP package does not tie VREF internally to VCC, preserving full external reference control.
How does the 2-channel MUX in the LTC1865AIMS#TRPBF function, and how is it controlled?
The LTC1865AIMS#TRPBF's 2-channel MUX is configured via a 2-bit word shifted into the SDI pin during the first two SCK cycles after CONV goes low. The bits select among four modes: differential CH0–CH1, single-ended CH0–GND, single-ended CH1–GND, or differential CH1–CH0. This eliminates need for external analog switches and enables dynamic channel selection in firmware.
What are the grounding requirements for optimal performance of the LTC1865AIMS#TRPBF?
The LTC1865AIMS#TRPBF requires separate AGND and DGND connections, both tied directly to a low-impedance analog ground plane with minimal trace length. Digital return currents must not flow through AGND paths. A single-point star ground connection between AGND and DGND is recommended near the device to prevent noise coupling while maintaining reference integrity for the SAR core.
Can the LTC1865AIMS#TRPBF interface directly with a microcontroller's SPI peripheral without level-shifting?
Yes - the LTC1865AIMS#TRPBF's digital I/O (CONV, SCK, SDI, SDO) is fully compatible with 5V-tolerant or 5V-native microcontrollers. VIH = 2.4V min and VOL = 0.4V max at 1.6mA sink ensure reliable logic-level recognition. No level-shifting is needed when interfacing with standard 5V SPI peripherals; however, proper bypassing and ground separation remain essential for analog accuracy.
LTC1865AIMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1865AIMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865AIMS#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1865AIMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865AIMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1865AIMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865AIMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865AIMS#TRPBF?
LTC1865AIMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865AIMS#TRPBF 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#TRPBF?
For technical support, including LTC1865AIMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865AIMS#TRPBF requirements.
6.How does Aetrix verify that LTC1865AIMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1865AIMS#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1865AIMS#TRPBF?
All LTC1865AIMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865AIMS#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1865AIMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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