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Analog Devices Inc. LTC1861LIMS#TRPBF
- Part No.:
- LTC1861LIMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1861LIMS#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,404
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Product details
Overview
LTC1861LIMS#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 with 450µA typical supply current at full speed and auto-shutdown down to 10µA at 1ksps. It features true differential analog inputs, SPI/MICROWIRE-compatible 3-wire serial interface, external reference input (1V to VCC), and high-impedance inputs enabling direct connection to low-output-impedance sensors in battery-powered data acquisition.
For engineers reviewing the LTC1861LIMS#TRPBF datasheet, LTC1861LIMS#TRPBF pinout, LTC1861LIMS#TRPBF application, or LTC1861LIMS#TRPBF equivalent, key selection considerations include its 2-channel MUX configuration via SDI, differential input capability, 12-bit no-missing-codes performance, −40°C to 85°C industrial temperature range (denoted by "I" grade), and compatibility with ratiometric or precision external references for portable instrumentation and isolated sensing systems.
Technical Context
The LTC1861LIMS#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and a 2-bit configuration word shifted in on SDI to select between four analog input combinations (single-ended CH0/GND, CH1/GND, or differential CH0–CH1, CH1–CH0). Its conversion timing is fixed at 3.7–4.66µs, synchronized to the rising edge of CONV, with data output on SDO aligned to falling SCK edges.
It separates analog and digital grounds (AGND/DGND pins) in the MSOP package to minimize noise coupling, supports full-scale spans from 1V to VCC via external VREF, and achieves 72dB SNR and 86dB THD at 1kHz while maintaining ±1 LSB INL and ±2 mV offset error over temperature - all while drawing only 1.22mW at maximum sampling rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function and unambiguous code mapping across full dynamic range. |
| Max Sampling Rate | 150ksps - enables real-time capture of signals up to ~30kHz full-linear bandwidth (S/(N+D) ≥ 68dB). |
| Supply Current | 450µA typ @ 150ksps; drops to 10µA @ 1ksps - auto-shutdown eliminates need for external power gating in intermittent-sampling applications. |
| INL / DNL | ±1 LSB INL, ±0.5 LSB DNL - ensures accurate amplitude representation without code-width anomalies or integral errors affecting calibration. |
| Reference Range | 1V to VCC (3.6V max) - allows flexible scaling from low-voltage sensor outputs (e.g., 1V thermopile) to rail-to-rail inputs when VREF = VCC. |
| SNR / THD | 72dB SNR, 86dB THD @ 1kHz - supports high-fidelity measurement of low-distortion analog signals in precision instrumentation. |
| Operating Temp | −40°C to +85°C - qualified for industrial environments including remote monitoring nodes and embedded control I/O modules. |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 0.86mm 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 stable conversion accuracy. |
| IN+ (Pin 2) | Analog Input (+) | Positive terminal of differential pair or single-ended channel 0 input; accepts voltage from −0.05V to VCC+0.05V with ≤1µA leakage. |
| IN– (Pin 3) | Analog Input (–) | Negative terminal of differential pair or single-ended channel 1 input; common-mode range extends to VCC/2, enabling asymmetric input configurations. |
| GND (Pin 4) | Analog Ground | Primary AGND connection; must tie directly to analog ground plane with minimal trace length to avoid noise injection into sampling capacitor. |
| CONV (Pin 5) | Convert Control | Rising edge initiates conversion; falling edge enables SDO output and configures MUX via SDI; high state after conversion triggers auto-shutdown. |
| SDO (Pin 6) | Serial Data Output | 3-wire SPI/MICROWIRE-compatible output; 12-bit result shifted out MSB-first on falling SCK edge; tri-stated when CONV is high. |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; supports DC to 8MHz clock; timing requires ≥45% duty cycle and defined setup/hold for SDI (LTC1861L only). |
| VCC (Pin 8) | Positive Supply | 2.7V–3.6V single supply; requires local 1µF tantalum bypass to AGND; ripple < 10mVpp critical for maintaining 72dB SNR. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Channel Software-Selectable MUX | Configurable via 2-bit SDI word to support CH0–GND, CH1–GND, CH0–CH1, or CH1–CH0 differential modes - eliminates external analog switches in dual-sensor systems. |
| True Differential Input Architecture | Rejects common-mode noise up to full bandwidth; maintains ±1 LSB INL even with 100mV p-p CM noise - ideal for noisy industrial sensor interfaces. |
| Low-Power Auto-Shutdown | Reduces ICC from 450µA to 10µA at 1ksps without external control logic - extends battery life in portable data loggers by >40× vs continuous operation. |
| High-Z Inputs with Low Leakage | ±1µA max analog input leakage and 12pF input capacitance in sample mode - permits direct connection to high-impedance sources (e.g., piezoelectric sensors) without buffer amplifiers. |
| Flexible Reference Interface | VREF pin accepts 1V–VCC, enabling ratiometric measurements with resistive sensors or precision scaling using external references like LT1460 (10ppm/°C). |
Applications
| Portable Battery-Powered Instrumentation | Isolated Remote Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter or environmental logger acquiring temperature, pressure, and humidity from multiple sensors on a single 3V coin cell. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two independent analog sensor outputs per conversion cycle, reducing system latency and component count vs discrete ADCs. Use Value: 450µA active current and 10µA sleep current enable >1-year battery life; 12-bit resolution supports 0.1°C temp resolution and 0.01% pressure linearity. |
Use Scenario: DIN-rail mounted sensor node measuring motor current and bearing vibration across galvanic isolation barrier in factory automation. IC Role / Device Role / Timing Role: ADC samples isolated analog signals post-isolation amplifier, with VREF referenced locally to avoid ground-loop errors in multi-point systems. Use Value: True differential inputs reject common-mode transients induced by switching drives; 72dB SNR preserves signal integrity despite 100V/ms dv/dt noise. |
| Compact Industrial I/O Modules | Low-Power Sensor Signal Conditioning |
Use Scenario: 4-channel analog input module in PLC backplane with space-constrained 12mm × 12mm PCB area per channel. IC Role / Device Role / Timing Role: Replaces larger SO-8 ADCs with MSOP footprint; 8-pin package integrates MUX, ref input, and serial interface - no external components needed for basic operation. Use Value: 3.0mm × 3.0mm MSOP saves >50% board area vs SO-8; SPI interface reduces GPIO count vs parallel ADCs, simplifying FPGA/ASIC interfacing. |
Use Scenario: Wearable health monitor digitizing ECG or bioimpedance signals from ultra-low-power front-end op amps. IC Role / Device Role / Timing Role: ADC accepts high-impedance, low-level biopotential signals directly due to 12pF input capacitance and ±1µA leakage - avoids gain-stage noise degradation. Use Value: 1V minimum VREF allows scaling to match small-signal amplitudes (e.g., 1mVpp ECG), preserving dynamic range without programmable gain amplifiers. |
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 |
|---|---|---|---|
| LTC1861LCS8#PBF | Same core ADC, but in 8-lead SO-8 package; VREF internally tied to VCC (fixed 3V span); no AGND/DGND separation. | Lower cost, higher thermal resistance (θJA = 210°C/W), less noise immunity - suitable for non-isolated, board-level sensing where layout control is tight. | Select when board space is unconstrained, reference voltage is fixed at VCC, and ground separation is unnecessary. |
| LTC1865LIMS#TRPBF | 16-bit version in same MSOP-8 package; identical pinout and interface; 150ksps, 450µA supply current, but higher 78dB SNR and ±2 LSB INL. | Higher resolution for precision metrology (e.g., weigh scales, calibration equipment); requires tighter reference stability and lower noise layout. | Select when 16-bit resolution is required and system can accommodate tighter layout controls and reference sourcing. |
Compared with LTC1861LCS8#PBF, the LTC1861LIMS#TRPBF offers superior noise immunity via separate AGND/DGND and flexible VREF scaling, while versus LTC1865LIMS#TRPBF it trades 4 bits of resolution for lower cost, simpler layout, and adequate performance for 12-bit industrial sensing.
Availability
LTC1861LIMS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated remote data acquisition, and compact industrial I/O modules requiring stable component supply, guaranteed long-term availability, and full industrial temperature grading.
Supply support for LTC1861LIMS#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1861LIMS#TRPBF belongs to Linear's µPower precision ADC family, designed specifically for space-constrained, battery-operated, and noise-sensitive measurement systems requiring high resolution without sacrificing power efficiency or ease of integration.
FAQ
What is the maximum clock frequency supported by the LTC1861LIMS#TRPBF serial interface?
The LTC1861LIMS#TRPBF supports a maximum SCK frequency of 8MHz under recommended operating conditions. This allows full 12-bit data transfer in ≤1.5µs, enabling tight timing margins in high-throughput microcontroller interfaces. The device tolerates DC to 8MHz with 45% minimum duty cycle, and timing parameters like tWHCLK and tWLCLK are specified at fSCK(MAX) to ensure reliable sampling.
Does the LTC1861LIMS#TRPBF require an external reference voltage, or can it operate with VCC as reference?
The LTC1861LIMS#TRPBF requires an external reference voltage applied to the VREF pin - it does not internally generate or derive reference from VCC. In the MSOP package, VREF accepts 1V to VCC (3.6V max), enabling ratiometric or precision reference configurations. Unlike the SO-8 version (LTC1861LCS8), the MSOP variant does not tie VREF to VCC internally, giving full design flexibility for accuracy-critical applications.
How does the LTC1861LIMS#TRPBF handle analog input protection beyond absolute maximum ratings?
The LTC1861LIMS#TRPBF specifies absolute input ranges of −0.05V to VCC+0.05V on IN+ and −0.05V to VCC/2 on IN−, with ±1µA leakage current. It includes no internal ESD diodes to VCC or GND beyond standard process protection. Therefore, external clamping (e.g., series resistors + Schottky diodes to VCC/AGND) is required for overvoltage or ESD-prone environments - especially when interfacing to connectors or long traces.
Can the LTC1861LIMS#TRPBF perform simultaneous sampling of both channels?
No, the LTC1861LIMS#TRPBF does not support simultaneous sampling. It uses a single SAR core with a 2-channel analog multiplexer; channel selection occurs before each conversion cycle based on the SDI configuration word. The conversion itself is sequential - one channel per CONV pulse - with typical conversion time of 3.7–4.66µs. For true simultaneous sampling, a dual-core ADC like the LTC2309 would be required.
What is the purpose of the separate AGND and DGND pins on the LTC1861LIMS#TRPBF MSOP package?
The LTC1861LIMS#TRPBF MSOP package provides dedicated AGND (Pin 4) and DGND (Pin 5) pins to isolate analog and digital return currents, minimizing noise coupling into the sensitive sampling circuitry. AGND must connect directly to the analog ground plane near bypass capacitors, while DGND should tie to the same plane at a single point - this separation preserves 72dB SNR and prevents digital switching noise from modulating the analog input path.
LTC1861LIMS#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1861LIMS#TRPBF FAQ
1.How can I place an order for LTC1861LIMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861LIMS#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 LTC1861LIMS#TRPBF reliable?
The price and inventory of LTC1861LIMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861LIMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1861LIMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861LIMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1861LIMS#TRPBF?
LTC1861LIMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861LIMS#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 LTC1861LIMS#TRPBF?
For technical support, including LTC1861LIMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861LIMS#TRPBF requirements.
6.How does Aetrix verify that LTC1861LIMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1861LIMS#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 LTC1861LIMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1861LIMS#TRPBF?
All LTC1861LIMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861LIMS#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 LTC1861LIMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1861LIMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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