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Analog Devices Inc. LTC1861LCMS#TRPBF
- Part No.:
- LTC1861LCMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1861LCMS#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
LTC1861LCMS#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 150ksps, 2-channel software-selectable multiplexed successive-approximation ADC in an 8-lead MSOP package, operating from a single 2.7V–3.6V supply. It features true differential input capability per channel, external reference support (1V to VCC), and SPI/MICROWIRE-compatible 3-wire serial interface. Its 450µA typical supply current at full speed and auto-shutdown down to 10µA at 1ksps make it ideal for battery-powered portable instrumentation.
For engineers reviewing the LTC1861LCMS#TRPBF datasheet, LTC1861LCMS#TRPBF pinout, LTC1861LCMS#TRPBF application, or LTC1861LCMS#TRPBF equivalent, key selection considerations include its 2-channel MUX configuration flexibility, differential analog input architecture, 12-bit no-missing-codes performance, and compatibility with low-noise signal conditioning stages in compact data acquisition systems.
Technical Context
The LTC1861LCMS#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold. Its 2-bit SDI configuration word selects among four analog input combinations - single-ended CH0/GND, CH1/GND, or differential CH0–CH1 and CH1–CH0 - enabling flexible sensor interfacing without external multiplexers.
It uses a 3-wire serial interface (CONV, SCK, SDO/SDI) with full-duplex operation: configuration data is clocked in on SDI during the CONV-low period, and conversion results are shifted out on SDO synchronized to SCK falling edges. Conversion time is fixed at 3.7–4.66µs, supporting deterministic timing in real-time control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and predictable linearity across full temperature range (0°C to 70°C). |
| Sampling Rate | 150ksps maximum - supports anti-aliasing filter design up to ~30kHz full linear bandwidth and enables sub-7µs loop cycle times. |
| Supply Current | 450µA typical at 150ksps; drops to 10µA at 1ksps via auto-shutdown - reduces average power in duty-cycled sensing applications. |
| INL Error | ±1 LSB max - limits end-point calibration burden and supports <0.025% FSR absolute accuracy with external reference. |
| Reference Range | 1V to VCC (MSOP version) - allows direct use of 2.5V or 3.0V precision references or ratiometric operation with sensor bridges. |
| Input Leakage | ±1µA max - permits high-impedance source interfacing (e.g., thermocouples, RTDs) with minimal offset drift. |
| SNR / THD | 72dB SNR and –86dB THD at 1kHz - sufficient for 11.5+ effective bits in audio and vibration monitoring applications. |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 1.1mm body, 0.65mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span (1V to VCC); must be low-noise and bypassed with ≥1µF tantalum to AGND for <±1 LSB error. |
| IN+ (Pin 2) | Analog Input (+) | Positive terminal of selected differential pair or single-ended channel; accepts –0.05V to VCC+0.05V common-mode range. |
| IN– (Pin 3) | Analog Input (–) | Negative terminal of selected differential pair; common-mode range limited to –0.05V to VCC/2 for proper sampling. |
| GND (Pin 4) | Analog Ground | Single-point connection point for analog return; must tie directly to analog ground plane with minimal trace length. |
| CONV (Pin 5) | Convert Control | Rising edge initiates conversion; falling edge enables SDO output and clocks in 2-bit MUX configuration via SDI. |
| SDO (Pin 6) | Serial Data Output | 12-bit result shifted out MSB-first on SCK falling edge; tri-states when CONV is high or after data transfer completes. |
| SCK (Pin 7) | Serial Clock Input | Synchronizes both configuration input (SDI) and result output (SDO); supports DC to 8MHz operation. |
| VCC (Pin 8) | Positive Supply | 2.7V–3.6V analog/digital supply; requires local 1µF bypass to GND to suppress switching noise coupling into conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Configurable via 2-bit SDI word to support CH0/GND, CH1/GND, CH0–CH1, or CH1–CH0 - eliminates need for external analog switches in dual-sensor systems. |
| Differential input architecture | Rejects common-mode noise on IN+/IN– pairs - enables accurate measurement in electrically noisy industrial environments without additional instrumentation amplifiers. |
| Auto-power-down between conversions | Reduces ICC from 450µA to 10µA at 1ksps - extends battery life in wireless sensor nodes by >40× versus continuous sampling. |
| SPI/MICROWIRE-compatible interface | 3-wire serial protocol with no minimum clock rate - simplifies firmware integration on resource-constrained MCUs and avoids complex timing constraints. |
| High-impedance analog inputs | 12pF input capacitance in sample mode - minimizes loading on high-Z sources like piezoelectric sensors or pH electrodes. |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter or environmental logger acquiring voltage, temperature, and humidity from multiple sensors using a single 3V coin cell. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing conditioned analog outputs from thermistor networks and bridge-based pressure transducers with ratiometric referencing. Use Value: 450µA active current and 10µA sleep current enable >1-year battery life; 12-bit resolution supports 0.1°C temperature resolution over 0–100°C range. |
Use Scenario: Industrial PLC module measuring 4–20mA current-loop signals across galvanically isolated barriers in hazardous locations. IC Role / Device Role / Timing Role: Isolated-side ADC converting differential sensor outputs referenced to local AGND, with digital data transmitted across optocoupler or capacitive isolator. Use Value: True differential inputs reject common-mode noise induced by ground potential differences; 1V–VCC reference flexibility allows matching to isolated 2.5V reference ICs. |
| Compact Sensor Fusion Node | Low-Power Vibration Monitoring |
|
Use Scenario: Edge node combining accelerometer, gyroscope, and magnetometer outputs for orientation estimation in IoT asset trackers. IC Role / Device Role / Timing Role: Time-multiplexed sampling of three analog sensor outputs using internal MUX, synchronized to MCU timer interrupts. Use Value: Pin-compatible upgrade path from LTC1298 enables higher throughput without PCB redesign; 150ksps supports oversampling for improved noise floor in sensor fusion algorithms. |
Use Scenario: Predictive maintenance sensor mounted on rotating machinery capturing broadband vibration spectra using MEMS accelerometers. IC Role / Device Role / Timing Role: High-fidelity digitization of ±2g accelerometer outputs with 72dB SNR and 30kHz full linear bandwidth for FFT-based fault detection. Use Value: 12-bit no-missing-codes performance ensures accurate amplitude tracking across full dynamic range; low 1µA input leakage prevents DC drift in AC-coupled front-end designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, low-power, serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1861LIMS#TRPBF | Same silicon, –40°C to 85°C extended temperature grade; identical pinout, timing, and electrical specs. | Required for automotive under-hood or industrial outdoor deployments where ambient exceeds 70°C. | Select LTC1861LIMS#TRPBF when operating temperature exceeds 70°C; otherwise LTC1861LCMS#TRPBF is optimal for cost-sensitive commercial applications. |
| LTC1865LCS8#PBF | 16-bit, 2-channel, SO-8 package, 3V supply, but 250ksps max and 1.22mW power - higher resolution but larger footprint and no MSOP option. | Used where 16-bit resolution is mandatory (e.g., precision weigh scales), accepting larger board area and higher power. | Choose LTC1865LCS8#PBF only if 16-bit resolution is required and SO-8 packaging is acceptable; LTC1861LCMS#TRPBF offers better size/power trade-off for 12-bit needs. |
Compared with LTC1861LIMS#TRPBF, the LTC1861LCMS#TRPBF trades extended temperature range for lower cost in commercial-grade applications, while LTC1865LCS8#PBF delivers higher resolution at the expense of increased power and board space - making LTC1861LCMS#TRPBF the optimal balance of size, speed, and efficiency for portable 12-bit data acquisition.
Availability
LTC1861LCMS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, compact sensor fusion nodes, and low-power vibration monitoring requiring stable component supply and long-term production continuity.
Supply support for LTC1861LCMS#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 and maintains its precision analog product lines, including high-performance data converters, references, and amplifiers for demanding industrial and instrumentation applications.
The LTC1861LCMS#TRPBF belongs to Linear's µPower 12-bit SAR ADC family, designed specifically for space-constrained, battery-operated systems requiring high resolution, low quiescent current, and flexible analog input configurations without external support components.
FAQ
What is the operating temperature range of the LTC1861LCMS#TRPBF?
The LTC1861LCMS#TRPBF is specified for 0°C to 70°C ambient operation. This commercial-grade temperature range is validated across all electrical parameters in the datasheet, including INL, SNR, and supply current. For applications requiring –40°C to 85°C, the pin-compatible LTC1861LIMS#TRPBF variant is available. The LTC1861LCMS#TRPBF's thermal performance is characterized with θJA = 175°C/W in the MSOP package.
Does the LTC1861LCMS#TRPBF require an external reference voltage?
Yes, the LTC1861LCMS#TRPBF requires an external reference voltage applied to the VREF pin (Pin 1). It supports reference voltages from 1V to VCC and does not include an internal reference. For ratiometric measurements, VREF can be tied to the same source as the sensor excitation voltage. The LTC1861LCMS#TRPBF's reference input leakage is ±1µA max, enabling use with low-power references like the LT1460 or LT1790.
How does the 2-channel MUX configuration work on the LTC1861LCMS#TRPBF?
The LTC1861LCMS#TRPBF uses a 2-bit configuration word shifted into the SDI pin during the CONV-low period to select among four input modes: single-ended CH0/GND, CH1/GND, or differential CH0–CH1 and CH1–CH0. The MUX state is latched on the rising edge of CONV, and the selected channel pair is sampled and converted. This eliminates external analog switches and supports flexible sensor routing in firmware-controlled sequences.
What is the minimum SCK frequency supported by the LTC1861LCMS#TRPBF?
The LTC1861LCMS#TRPBF has no minimum SCK frequency requirement - it supports DC-coupled clocking. This allows ultra-low-power operation where the host MCU can pause the SCK between conversions or use very slow clocks for debug interfaces. The maximum SCK frequency is 8MHz, and timing parameters like tWHCLK and tWLCLK scale proportionally with clock period, ensuring reliable operation across the full range.
Can the LTC1861LCMS#TRPBF operate with a 2.5V reference while powered from a 3.3V supply?
Yes, the LTC1861LCMS#TRPBF supports independent VCC (2.7V–3.6V) and VREF (1V–VCC) supplies. With VCC = 3.3V and VREF = 2.5V, the device achieves a full-scale range of 2.5V with 12-bit resolution (0.61mV/LSB), while maintaining specified performance for INL (±1 LSB), SNR (72dB), and input leakage (±1µA). This configuration is commonly used with precision 2.5V references for improved absolute accuracy.
LTC1861LCMS#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):
- 150k
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1861LCMS#TRPBF FAQ
1.How can I place an order for LTC1861LCMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861LCMS#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 LTC1861LCMS#TRPBF reliable?
The price and inventory of LTC1861LCMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861LCMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1861LCMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861LCMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1861LCMS#TRPBF?
LTC1861LCMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861LCMS#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 LTC1861LCMS#TRPBF?
For technical support, including LTC1861LCMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861LCMS#TRPBF requirements.
6.How does Aetrix verify that LTC1861LCMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1861LCMS#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 LTC1861LCMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1861LCMS#TRPBF?
All LTC1861LCMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861LCMS#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 LTC1861LCMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1861LCMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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