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Analog Devices Inc. LTC1861CMS#TRPBF
- Part No.:
- LTC1861CMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1861CMS#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,046
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Product details
Overview
LTC1861CMS#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, and high-impedance analog inputs enabling direct connection to low-output-impedance sensors in portable instrumentation.
For engineers reviewing the LTC1861CMS#TRPBF datasheet, LTC1861CMS#TRPBF pinout, LTC1861CMS#TRPBF application, or LTC1861CMS#TRPBF equivalent, key selection considerations include its 2-channel MUX configuration via SDI, 1V–5V reference voltage range, guaranteed operation to 125°C in MSOP, differential or single-ended input modes, and compatibility with low-power microcontroller serial interfaces.
Technical Context
The LTC1861CMS#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting true differential or pseudo-differential input configurations via a 2-bit SDI control word. Its conversion timing is deterministic: tCONV = 3.2µs max at 125°C, with SDO data valid 25ns after SCK↓ (CLOAD = 20pF).
It uses a 3-wire serial interface (SCK, SDO, SDI) with full-duplex capability - configuration bits are clocked into SDI on SCK↑ while conversion results shift out on SDO on SCK↓. The CONV pin controls both conversion initiation and output enable, with automatic power-down when held high post-conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement of analog sensor signals. |
| Max Sampling Rate | 250ksps - supports real-time acquisition of signals up to ~125kHz Nyquist bandwidth. |
| Supply Current | 850µA typ at 250ksps; drops to 1nA in auto-shutdown - enables battery life extension in portable systems. |
| INL Error | ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error for accurate calibration-critical applications. |
| Reference Range | 1V to VCC (5V) - allows flexible scaling from low-voltage sensors without external gain stages. |
| SNR | 72dB - corresponds to ~12-bit effective resolution under ideal conditions, matching nominal resolution. |
| Operating Temp | 0°C to 70°C - specified for commercial-grade embedded systems requiring stable performance across ambient environments. |
Pinout & Package
Package: 10-lead plastic MSOP (MS package), 3.0mm × 3.0mm body, 0.5mm lead pitch, JEDEC MO-187 variant. Thermal resistance θJA = 210°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV | Convert Input | Active-high trigger initiating conversion; low level enables SDO output and permits serial readout. |
| CH0 / CH1 | Analog Input Channels | High-impedance inputs for single-ended or differential sampling; selected via SDI configuration word. |
| AGND | Analog Ground | Dedicated analog return path-must be tied directly to analog ground plane to minimize noise coupling. |
| DGND | Digital Ground | Separate digital return; internally isolated from AGND but should be connected at single point to avoid ground loops. |
| SDI | Serial Data Input | Receives 2-bit MUX configuration (SGL/DIFF, ODD/SIGN) on rising SCK edges before conversion. |
| SDO | Serial Data Output | Outputs 12-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV is high. |
| SCK | Serial Clock Input | Synchronizes bidirectional data transfer; supports up to 20MHz clock (H-grade) for fast readout. |
| VCC | Positive Supply | Single 4.75V–5.25V rail; requires local 1µF tantalum bypass to AGND for stable conversion accuracy. |
| VREF | Reference Input | Defines full-scale span (1V–5V); must be low-noise and decoupled-no internal connection to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Enables dynamic channel routing (CH0/CH1, differential or single-ended) without hardware reconfiguration. |
| Adjustable reference input (1V–5V) | Eliminates need for external op-amp gain stages when interfacing with sub-5V sensors or references. |
| Auto-shutdown between conversions | Reduces average current to <1nA idle, critical for multi-second interval sensing in energy-constrained nodes. |
| SPI/MICROWIRE-compatible interface | Direct interoperability with standard MCU SPI peripherals-no custom driver logic required. |
| Guaranteed operation to 125°C (MSOP) | Validated performance in harsh thermal environments such as automotive cabin electronics or industrial motor controllers. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure over days using intermittent sampling. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing conditioned sensor outputs with configurable input ranges and ultra-low quiescent current between samples. Use Value: Enables >1-year battery life via 1nA shutdown current and eliminates external multiplexer or gain circuitry. | Use Scenario: Modular PLC analog input modules acquiring signals from 4–20mA transmitters and thermocouples in factory automation cabinets. IC Role / Device Role / Timing Role: Precision front-end converter supporting ratiometric measurements with external references and robust noise rejection via differential sampling. Use Value: ±1 LSB INL and 72dB SNR ensure compliance with IEC 61000-4-5 surge immunity and 16-bit-equivalent system accuracy. |
| Medical Wearables | Isolated Remote Monitoring |
Use Scenario: Compact ECG patch measuring biopotentials with minimal signal conditioning and strict size constraints. IC Role / Device Role / Timing Role: Low-power, small-footprint ADC capturing differential electrode signals with adjustable reference for variable gain paths. Use Value: 10-lead MSOP footprint (3×3mm) and direct sensor interface reduce PCB area by >40% vs. SO-8 alternatives. | Use Scenario: Wireless sensor node deployed in hazardous zones, transmitting analog readings across galvanic isolation barrier. IC Role / Device Role / Timing Role: Isolation-side ADC converting isolated analog signals with minimal power draw to extend isolated DC-DC converter lifetime. Use Value: 850µA active current and 3.2µs conversion time minimize isolated supply loading and latency in closed-loop feedback. |
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#TRPBF | 16-bit resolution, 250ksps, 8-lead MSOP, pin-compatible with LTC1860 but not LTC1861; no MUX; fixed VREF = VCC in SO-8. | Higher resolution needed for precision metrology; no channel selection required; lower sampling efficiency per mW. | Select when 16-bit accuracy outweighs dual-channel flexibility and adjustable reference. |
| ADS7822U | 12-bit, 200ksps, 8-lead SOIC, TI part; SPI interface; internal reference only; no adjustable VREF pin; 1-channel only. | Cost-sensitive designs where external reference isn't used and channel count is fixed; lacks MUX and wide VREF range. | Select for simplified BOM where internal reference suffices and dual-channel operation is unnecessary. |
Compared with LTC1864CMS8#TRPBF and ADS7822U, the LTC1861CMS#TRPBF uniquely balances 2-channel software MUX, 1V–5V reference adjustability, and ultra-low shutdown current-making it optimal for compact, battery-powered, multi-sensor systems requiring design flexibility without resolution trade-offs.
Availability
LTC1861CMS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, medical wearables, and isolated remote monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1861CMS#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 acquired Linear Technology in 2017; Linear pioneered high-performance analog ICs including precision data converters, references, and power management solutions.
The LTC1861CMS#TRPBF belongs to Linear's µPower SAR ADC family, designed specifically for space- and energy-constrained embedded systems needing high-speed, low-power, and flexible analog input architectures.
FAQ
What is the maximum sampling rate of the LTC1861CMS#TRPBF?
The LTC1861CMS#TRPBF achieves a maximum sampling rate of 250ksps at 5V supply and 25°C. At the extended temperature grade (–40°C to 125°C), the guaranteed maximum remains 248ksps per datasheet specifications. This rate supports full 12-bit resolution without missing codes and defines the upper limit for continuous acquisition in time-critical applications like motor current sensing or vibration analysis.
Does the LTC1861CMS#TRPBF support differential input mode?
Yes, the LTC1861CMS#TRPBF supports true differential input mode via its software-configurable MUX. When configured using the 2-bit SDI word (SGL/DIFF = 0, ODD/SIGN = 0 or 1), it measures the voltage difference between CH0 and CH1 or CH1 and CH0 respectively. This mode provides common-mode noise rejection and is validated in the datasheet's MUX channel selection table and functional block diagram.
What is the purpose of the SDI pin on the LTC1861CMS#TRPBF?
The SDI (Serial Data Input) pin on the LTC1861CMS#TRPBF receives a 2-bit configuration word that selects the analog input channel and mode (single-ended or differential) prior to each conversion. This word is clocked in on rising SCK edges immediately after CONV goes low, enabling dynamic channel selection without changing hardware connections or requiring external multiplexers.
Can the LTC1861CMS#TRPBF operate with a 3.3V supply?
No-the LTC1861CMS#TRPBF is specified exclusively for single 4.75V to 5.25V operation per Absolute Maximum Ratings and Recommended Operating Conditions. Attempting 3.3V operation violates VCC minimum and will result in undefined behavior, failed conversions, or damage. For 3.3V systems, consider pin-compatible alternatives like the LTC1401 or ADS7822U.
How does the auto-shutdown feature work on the LTC1861CMS#TRPBF?
The LTC1861CMS#TRPBF automatically enters ultra-low-power shutdown (1nA typical) when the CONV pin is held high after conversion completion. This state persists until CONV is pulled low to initiate the next conversion cycle and enable SDO. The feature eliminates external power-gating circuitry and is intrinsic to the device's internal bias control-confirmed in the "Features" section and supply current vs. sampling frequency plots.
LTC1861CMS#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1861CMS#TRPBF FAQ
1.How can I place an order for LTC1861CMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861CMS#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 LTC1861CMS#TRPBF reliable?
The price and inventory of LTC1861CMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861CMS#TRPBF is usually 5 days.
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4.How is shipping managed for LTC1861CMS#TRPBF?
LTC1861CMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861CMS#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 LTC1861CMS#TRPBF?
For technical support, including LTC1861CMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861CMS#TRPBF requirements.
6.How does Aetrix verify that LTC1861CMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1861CMS#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 LTC1861CMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1861CMS#TRPBF?
All LTC1861CMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861CMS#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 LTC1861CMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1861CMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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