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Analog Devices Inc. LTC1865ACMS#TRPBF
- Part No.:
- LTC1865ACMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1865ACMS#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,867
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Product details
Overview
LTC1865ACMS#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 and auto shutdown to 2μA at 1ksps. It features true differential input MUX, adjustable external reference (1V to VCC), SPI/MICROWIRE-compatible serial interface, and guaranteed operation from 0°C to 70°C - used in portable instrumentation and isolated data acquisition systems.
For engineers reviewing the LTC1865ACMS#TRPBF datasheet, LTC1865ACMS#TRPBF pinout, LTC1865ACMS#TRPBF application, or LTC1865ACMS#TRPBF equivalent, key selection criteria include its 2-channel MUX configuration, 16-bit resolution at 250ksps, MSOP-10 thermal performance (θJA = 210°C/W), differential analog input range (0 to VREF), and compatibility with low-power microcontroller interfaces requiring minimal external support circuitry.
Technical Context
The LTC1865ACMS#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise 16-bit conversion without external hold circuitry. Its 2-bit SDI-controlled MUX supports four configurations: two single-ended (CH0–GND, CH1–GND) and two differential (CH0–CH1, CH1–CH0), all referenced to AGND/DGND separation in the MSOP package.
Timing is governed by a 3-wire serial interface: CONV initiates conversion, SCK clocks data transfer, and SDI/SDO operate full-duplex with data valid on SCK falling edge. Conversion time is fixed at 3.2μs (max), supporting up to 250ksps sampling while maintaining 87dB SNR and ±6 LSB INL over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-precision sensor or control loop digitization. |
| Max Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz full-linear bandwidth (S/(N+D) ≥ 75dB). |
| Supply Current | 850μA typ at 250ksps; drops to 2μA at 1ksps - eliminates need for external power gating in battery-powered designs. |
| INL Error | ±6 LSB max - ensures monotonicity and accurate end-point linearity for closed-loop feedback applications. |
| Signal-to-Noise Ratio | 87dB - supports >14 ENOB in clean signal environments, critical for dynamic measurements like vibration analysis. |
| Reference Range | 1V to VCC (5V) - allows direct interfacing with low-voltage sensors or precision references without gain stages. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded instrumentation where extended temperature is not required. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), θJA = 210°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert Input | Active-high trigger initiating conversion; held high after completion to enter auto-shutdown mode. |
| CH0 | Analog Input Channel 0 | Positive or negative input terminal depending on MUX configuration selected via SDI bits. |
| CH1 | Analog Input Channel 1 | Paired with CH0 for differential measurement or used as second single-ended input. |
| AGND | Analog Ground | Dedicated low-noise return path for analog inputs and reference; 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 | Digital Data Input | Receives 2-bit MUX configuration word on rising SCK edges during CONV low phase. |
| SDO | Digital Data Output | Transmits 16-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV high. |
| SCK | Serial Clock Input | Master-synchronized clock (up to 20MHz) controlling both SDI setup/hold and SDO timing. |
| VCC | Positive Supply | Single 4.75V–5.25V rail powering analog and digital sections; requires local 1μF tantalum bypass to AGND. |
| VREF | Reference Input | Defines full-scale range (1V–5V); high-impedance node requiring low-noise layout and decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Enables flexible signal routing (single-ended or differential) without hardware changes - reduces BOM count in multi-sensor systems. |
| Auto Power-Down Between Conversions | Reduces average current to sub-μA levels at low sampling rates, extending battery life in portable devices beyond 10 years. |
| True Differential Input Architecture | Rejects common-mode noise up to 125kHz bandwidth, eliminating need for external instrumentation amplifiers in noisy industrial environments. |
| 16-Bit No-Missing-Codes Performance | Guarantees monotonic response across full temperature range - essential for position encoders and closed-loop motor control. |
| MSOP-10 Small Footprint | 3mm × 3mm body with 0.5mm pitch saves PCB area versus SO-8 alternatives while maintaining thermal robustness (210°C/W). |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter measuring voltage, current, and resistance with autoranging and LCD display. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog front-end outputs; synchronized to MCU's SPI peripheral at 250ksps burst mode. Use Value: 16-bit resolution enables 0.01% measurement accuracy; low 850μA supply current extends AA battery life to >200 hours per charge. | Use Scenario: Industrial sensor node transmitting thermocouple and RTD readings across opto-isolated RS-485 link. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring CH0 (thermocouple) and CH1 (RTD bridge) simultaneously; MUX configured for differential reads to reject ground loop noise. Use Value: True differential inputs suppress common-mode interference from 50/60Hz mains; 87dB SNR preserves signal integrity before isolation barrier. |
| Low-Power Battery-Operated Systems | Compact Embedded Monitoring |
Use Scenario: Wireless environmental monitor logging temperature, humidity, and CO₂ using coin-cell battery. IC Role / Device Role / Timing Role: ADC sampling sensors at 1ksps, then entering auto-shutdown; triggered by MCU only during scheduled wake-up intervals. Use Value: 2μA sleep current minimizes quiescent drain; adjustable 1V reference allows direct interface with low-output MEMS sensors. | Use Scenario: Motor drive controller monitoring phase currents and bus voltage in space-constrained BLDC inverter. IC Role / Device Role / Timing Role: Simultaneous sampling of two shunt-based current sense signals (CH0/CH1) in differential mode for torque estimation. Use Value: 250ksps rate captures fast transients during commutation; ±6 LSB INL ensures accurate current reconstruction for field-oriented control. |
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; no internal MUX; requires external reference buffer. | Higher speed but lacks integrated MUX and operates at lower voltage - unsuitable for 5V systems or dual-input multiplexing without added components. | Select when system demands >250ksps and uses 3.3V logic; avoid if 5V compatibility or channel switching is required. |
| AD7682BRMZ | 16-bit, 250ksps, pseudo-differential 4-channel MUX, 2.3V–5.5V supply; SPI-compatible; no auto shutdown below 10μA. | Includes 4-channel MUX but only pseudo-differential (shared COM pin); higher idle current limits ultra-low-power use cases. | Prefer for multi-sensor systems needing >2 channels; choose LTC1865ACMS#TRPBF when true differential pairs and sub-μA sleep are mandatory. |
Compared with ADS8860IDRCT and AD7682BRMZ, the LTC1865ACMS#TRPBF uniquely combines true differential 2-channel MUX, 5V single-supply operation, and 2μA auto-shutdown - making it optimal for compact, battery-sensitive, noise-immune instrumentation where channel flexibility and power efficiency are co-prioritized.
Availability
LTC1865ACMS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and low-power battery-operated systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1865ACMS#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1865ACMS#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for ultra-low-power, high-resolution ADC applications in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling frequency supported by the LTC1865ACMS#TRPBF?
The LTC1865ACMS#TRPBF supports a maximum sampling frequency of 250ksps under recommended operating conditions (VCC = 5V, fSCK ≤ 20MHz). This rate is achievable across its full 0°C to 70°C operating temperature range and corresponds to a fixed 3.2μs conversion time. At lower speeds, auto-shutdown reduces supply current proportionally - e.g., to 2μA at 1ksps - preserving power efficiency without sacrificing resolution.
Does the LTC1865ACMS#TRPBF require an external reference voltage?
Yes, the LTC1865ACMS#TRPBF requires an external reference voltage applied to the VREF pin, which defines its full-scale input range. The MSOP version accepts 1V to VCC (5V), allowing direct connection to precision references or low-voltage sensors. Unlike the SO-8 variant, the MSOP package does not tie VREF internally to VCC - giving designers full flexibility to optimize SNR and dynamic range for specific signal conditioning requirements.
How many analog input channels does the LTC1865ACMS#TRPBF support, and how are they selected?
The LTC1865ACMS#TRPBF supports two analog input channels (CH0 and CH1) with software-selectable multiplexing via a 2-bit word shifted into the SDI pin. Four configurations are possible: single-ended CH0–GND, single-ended CH1–GND, differential CH0–CH1, and differential CH1–CH0. Selection occurs during the CONV low phase before conversion starts, enabling dynamic reconfiguration between samples without hardware modification.
What is the purpose of separate AGND and DGND pins on the LTC1865ACMS#TRPBF MSOP package?
The LTC1865ACMS#TRPBF MSOP package includes dedicated AGND and DGND pins to isolate analog and digital return paths, minimizing noise coupling between sensitive analog front-end circuitry and noisy digital I/O switching. AGND serves as the reference for analog inputs and VREF; DGND returns digital currents from SDO, SDI, and SCK. Both must be tied to a common analog ground plane at a single point near the device to preserve 87dB SNR and prevent ground bounce-induced INL errors.
Can the LTC1865ACMS#TRPBF operate from a 3.3V supply?
No, the LTC1865ACMS#TRPBF is specified only for 4.75V to 5.25V single-supply operation per its Absolute Maximum Ratings and Recommended Operating Conditions. Attempting 3.3V operation violates datasheet specifications and will result in undefined behavior, including failure to meet timing, resolution, or INL guarantees. For 3.3V systems, consider alternatives such as the AD7682BRMZ or ADS8860IDRCT, which are explicitly rated for lower supply voltages.
LTC1865ACMS#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865ACMS#TRPBF FAQ
1.How can I place an order for LTC1865ACMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865ACMS#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 LTC1865ACMS#TRPBF reliable?
The price and inventory of LTC1865ACMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865ACMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1865ACMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865ACMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865ACMS#TRPBF?
LTC1865ACMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865ACMS#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 LTC1865ACMS#TRPBF?
For technical support, including LTC1865ACMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865ACMS#TRPBF requirements.
6.How does Aetrix verify that LTC1865ACMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1865ACMS#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 LTC1865ACMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1865ACMS#TRPBF?
All LTC1865ACMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865ACMS#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 LTC1865ACMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1865ACMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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