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Analog Devices Inc. LTC1861IMS#TRPBF
- Part No.:
- LTC1861IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1861IMS#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,642
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Product details
Overview
LTC1861IMS#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 250ksps, 2-channel software-selectable multiplexed successive approximation ADC in a 10-lead MSOP package, operating on a single 5V supply with 850µA typical supply current and auto-shutdown to 1nA between conversions. It features SPI/MICROWIRE-compatible serial I/O, adjustable reference input (1V to VCC), and true differential or single-ended analog input modes - used in portable instrumentation and isolated data acquisition systems.
For engineers reviewing the LTC1861IMS#TRPBF datasheet, LTC1861IMS#TRPBF pinout, LTC1861IMS#TRPBF application, or LTC1861IMS#TRPBF equivalent, key selection criteria include its 2-channel MUX configuration capability, guaranteed operation to 85°C (I-grade), 10-lead MSOP thermal performance (θJA = 210°C/W), and compatibility with low-noise analog front-ends for ratiometric sensing.
Technical Context
The LTC1861IMS#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting full-duplex serial communication via SDI/SDO/SCK. Its 2-bit configuration word selects among four input combinations (single-ended CH0/CH1 or differential ± pairs), enabling flexible signal routing without external mux hardware.
It operates with high-impedance analog inputs (±1µA leakage), accepts reduced full-scale spans down to 1V, and maintains 71dB SINAD at 100kHz input - all while sustaining 250ksps sampling under 5V supply with minimal power management overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with no missing codes across full temperature range. |
| Sampling Rate | 250ksps maximum - supports real-time acquisition of signals up to 125kHz full linear bandwidth. |
| Supply Current | 850µA typical at 250ksps; drops to 1nA in auto-shutdown - enables battery-powered operation for >1 year on coin cell. |
| INL Error | ±1 LSB - ensures monotonic transfer function critical for closed-loop control feedback paths. |
| Reference Range | 1V to VCC (5V) - allows direct interfacing with low-voltage sensors or precision references like LT1460. |
| SINAD | 71dB at 100kHz - supports accurate digitization of medium-frequency sensor outputs (e.g., accelerometers, pressure transducers). |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial environments including motor control and PLC modules. |
Pinout & Package
Package: 10-lead plastic MSOP (MS package), 3.00mm × 3.00mm body, 0.50mm pitch, θJA = 210°C/W, rated for operation up to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV (1) | Convert Control Input | Rising edge initiates conversion; held high after completion to enter 1nA sleep mode; falling edge enables SDO for readout. |
| CH0 (2) | Analog Input Channel 0 | High-impedance input (±1µA leakage); used as "+" or "–" in MUX-selected differential pair or as single-ended source referenced to AGND. |
| CH1 (3) | Analog Input Channel 1 | Identical electrical characteristics to CH0; paired with CH0 in differential mode or used independently in single-ended mode. |
| AGND (4) | Analog Ground Reference | Must connect directly to analog ground plane with minimal trace length to preserve 12-bit accuracy and reject common-mode noise. |
| DGND (5) | Digital Ground Reference | Internally isolated from AGND; requires star-point connection to AGND near device to prevent digital switching noise coupling into analog path. |
| SDI (6) | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges before conversion; latched on CONV falling edge. |
| SDO (7) | Serial Data Output | Outputs 12-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV is high or during sleep. |
| SCK (8) | Serial Clock Input | Accepts up to 16.7MHz clock (H-grade); synchronizes both SDI write and SDO read in full-duplex mode. |
| VCC (9) | Positive Supply | 4.75V to 5.25V operation; requires ≥1µF tantalum bypass to AGND close to pin to suppress supply-induced code errors. |
| VREF (10) | Reference Voltage Input | Defines full-scale span (1V to 5V); high-impedance node requiring low-noise layout and local decoupling to maintain INL spec. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Eliminates need for external analog multiplexer and associated PCB area, timing skew, and crosstalk in multi-sensor systems. |
| Auto Shutdown to 1nA | Reduces average power in duty-cycled applications (e.g., periodic sensor polling), extending battery life without firmware sleep management. |
| Adjustable Reference (1V–VCC) | Enables direct interface with low-output sensors (e.g., 1.25V bandgap references) without gain stages, preserving SNR and reducing component count. |
| True Differential Input Architecture | Rejects common-mode noise on CH0/CH1 pairs - critical for noisy industrial environments where sensor leads run alongside motor drives or switching supplies. |
| Guaranteed Operation to 125°C Junction | Validates use in under-hood automotive modules or enclosed industrial enclosures without derating or forced cooling. |
Applications
| Portable Multimeter Front-End | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage, current (via shunt), and resistance with autoranging. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes voltage and current simultaneously using internal MUX; 250ksps sampling captures transient events during continuity testing. Use Value: Single-chip solution replaces discrete mux + ADC, reducing BOM cost by $1.20 and board area by 28 mm² while maintaining 12-bit resolution. |
Use Scenario: DIN-rail mounted PLC module acquiring 4–20mA loop signals from field transmitters in factory automation. IC Role / Device Role / Timing Role: Configured for single-ended CH0/CH1 reads with external precision resistors; 1nA shutdown minimizes self-heating in densely packed I/O modules. Use Value: High-impedance inputs eliminate buffer op-amps per channel, cutting power consumption by 3.6mW per channel versus buffered alternatives. |
| Isolated Remote Sensor Node | Battery-Powered Environmental Monitor |
Use Scenario: Wireless sensor node deployed in high-voltage substations, measuring temperature and partial discharge signals across galvanic isolation barrier. IC Role / Device Role / Timing Role: Operates from isolated 5V rail; differential input mode rejects common-mode transients induced by switching surges on adjacent bus lines. Use Value: 71dB SINAD at 100kHz ensures accurate capture of PD pulse waveforms without aliasing, meeting IEC 60270 compliance thresholds. |
Use Scenario: Solar-powered soil moisture and ambient temperature logger transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Samples capacitive soil sensor and thermistor once per hour; remains in 1nA shutdown between conversions to minimize quiescent drain. Use Value: Achieves >5-year battery life on 2400mAh Li-SOCl₂ cell due to sub-nA sleep current and no external reference IC required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, serial-interface ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1864CMS8#PBF | 1-channel, pin-compatible SO-8/MSOP; same 250ksps rate but lacks MUX; includes internal reference option. | Best for single-input systems where board space permits SO-8 and reference integration simplifies design. | Select when only one analog source is needed and internal reference eliminates external VREF circuitry. |
| ADS7822U | TI 12-bit, 200ksps, 8-pin SOIC; SPI interface; fixed 2.5V internal reference; no software-configurable MUX. | Suitable for cost-sensitive consumer devices where 50ksps lower speed is acceptable and dual-channel flexibility is not required. | Choose for high-volume production where TI's broad distribution and lower unit pricing offset loss of MUX functionality. |
Compared with LTC1861IMS#TRPBF, LTC1864CMS8#PBF offers simpler single-channel operation with optional internal reference but no multiplexing, while ADS7822U trades MUX capability and adjustable reference for lower cost and integrated reference - making LTC1861IMS#TRPBF uniquely suited for compact, dual-sensor industrial nodes requiring flexible input configuration and ultra-low quiescent power.
Availability
LTC1861IMS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, industrial PLC analog input modules, and battery-operated environmental monitors requiring stable component supply across extended temperature ranges.
Supply support for LTC1861IMS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement and control.
The LTC1861IMS#TRPBF belongs to Linear's µPower SAR ADC product line, designed specifically for space-constrained, low-power industrial and portable instrumentation where accuracy, flexibility, and thermal robustness are critical.
FAQ
What is the maximum sampling frequency of the LTC1861IMS#TRPBF?
The LTC1861IMS#TRPBF supports a maximum sampling frequency of 250ksps at 5V supply and 25°C ambient. This is guaranteed over the full –40°C to +85°C operating temperature range for the I-grade version, with conversion time specified at 3.2µs maximum under H-grade conditions.
Does the LTC1861IMS#TRPBF require an external reference voltage?
Yes, the LTC1861IMS#TRPBF requires an external reference voltage applied to the VREF pin (Pin 10). It accepts 1V to 5V reference inputs and does not include an internal reference. For designs needing integrated reference, consider the LTC1864/LTC1865 family instead.
How does the MUX configuration work on the LTC1861IMS#TRPBF?
The LTC1861IMS#TRPBF uses a 2-bit word shifted into SDI (Pin 6) during the CONV low phase to select among four input configurations: single-ended CH0 or CH1, or differential CH0–CH1 or CH1–CH0. The configuration is latched on the falling edge of CONV and applies to the next conversion cycle.
What is the sleep current specification for the LTC1861IMS#TRPBF?
The LTC1861IMS#TRPBF achieves a typical sleep current of 1nA when CONV is held high after conversion completion. This ultra-low quiescent current is maintained across the full –40°C to +85°C temperature range and enables multi-year battery life in intermittent-sampling applications.
Can the LTC1861IMS#TRPBF operate with a 3.3V supply?
No, the LTC1861IMS#TRPBF is specified for 4.75V to 5.25V supply operation only. It is not rated for 3.3V operation. For 3.3V-compatible 12-bit ADCs, consider the LTC1401 or ADS7822U, which are explicitly characterized at 3V supply.
LTC1861IMS#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:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- 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:
- -
LTC1861IMS#TRPBF FAQ
1.How can I place an order for LTC1861IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861IMS#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 LTC1861IMS#TRPBF reliable?
The price and inventory of LTC1861IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1861IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1861IMS#TRPBF?
LTC1861IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861IMS#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 LTC1861IMS#TRPBF?
For technical support, including LTC1861IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861IMS#TRPBF requirements.
6.How does Aetrix verify that LTC1861IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1861IMS#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 LTC1861IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1861IMS#TRPBF?
All LTC1861IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861IMS#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 LTC1861IMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1861IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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