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Analog Devices Inc. LTC1861LCS8#TRPBF
- Part No.:
- LTC1861LCS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1861LCS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,302
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Product details
Overview
LTC1861LCS8#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 150ksps, single-supply 3V successive approximation ADC with integrated sample-and-hold and software-selectable 2-channel multiplexer. It features SPI/MICROWIRE-compatible serial I/O, true differential input capability per channel, and auto-shutdown reducing supply current to 10µA at 1ksps. It is used in compact, battery-powered data acquisition systems requiring high resolution and low power.
For engineers reviewing the LTC1861LCS8#TRPBF datasheet, LTC1861LCS8#TRPBF pinout, LTC1861LCS8#TRPBF application, or LTC1861LCS8#TRPBF equivalent, key selection criteria include its SO-8 package compatibility, 3V-only operation, external reference support (VREF pin), differential MUX configuration via SDI, and guaranteed no missing codes over temperature.
Technical Context
The LTC1861LCS8#TRPBF implements a switched-capacitor SAR architecture with internal clocking and automatic power-down between conversions. Its 2-channel MUX is configured via a 2-bit word shifted into SDI after CONV falls, enabling four analog input modes: single-ended CH0/GND, CH1/GND, or differential CH0–CH1 and CH1–CH0.
It operates exclusively on a 2.7V–3.6V supply, with VREF tied internally to VCC in the SO-8 package - eliminating need for external reference circuitry in ratiometric applications. 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 bits with guaranteed no missing codes across full temperature range - ensures monotonicity in closed-loop feedback systems. |
| Sampling Rate | 150 ksps maximum - supports anti-aliasing filter design up to ~75 kHz Nyquist bandwidth. |
| Supply Current | 450 µA typical at 150 ksps; drops to 10 µA at 1 ksps - enables ultra-low-power sleep modes in intermittent sensing. |
| INL Error | ±1 LSB max - maintains accuracy in precision sensor interfacing without calibration. |
| SNR / THD | 72 dB SNR and –86 dB THD at 1 kHz - suitable for medium-fidelity signal capture in instrumentation. |
| Input Voltage Range | 0 V to VCC on IN+ and –0.05 V to VCC/2 on IN– - allows direct connection to op-amp outputs or resistive sensors. |
| Reference Input | VREF internally tied to VCC in SO-8 package - simplifies board layout by removing external reference component. |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150-inch width), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV (Pin 1) | Convert Start Input | Rising edge initiates conversion; held high after completion enters auto-shutdown mode; falling edge enables SDO output. |
| CH0 (Pin 2) | Analog Input Channel 0 (+) | Positive input for single-ended or differential measurement; accepts voltage up to VCC + 0.05 V. |
| CH1 (Pin 3) | Analog Input Channel 1 (+) | Positive input for second channel; supports differential pair with CH0 or GND as reference. |
| GND (Pin 4) | Analog Ground | Common return for analog signals and reference; must connect directly to analog ground plane. |
| VCC (Pin 5) | Positive Supply | 2.7–3.6 V supply; requires local 1 µF tantalum bypass to GND for stable conversion performance. |
| SCK (Pin 6) | Serial Clock Input | Accepts up to 8 MHz clock; synchronizes full-duplex data transfer on rising/falling edges. |
| SDO (Pin 7) | Serial Data Output | Outputs 12-bit conversion result MSB-first on falling SCK edge; tri-stated when CONV high. |
| SDI (Pin 8) | Serial Data Input | Receives 2-bit MUX configuration word after CONV falls; determines next conversion's input mode. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Enables flexible input routing (single-ended CH0/GND, CH1/GND or differential CH0–CH1/CH1–CH0) without external switches. |
| Auto Shutdown Between Conversions | Reduces average current from 450 µA to 10 µA at low sampling rates - extends battery life in portable devices. |
| True Differential Input Architecture | Rejects common-mode noise on paired inputs - improves immunity in noisy industrial environments. |
| Internal VREF = VCC in SO-8 Package | Eliminates external reference IC and associated passive components - reduces BOM count and PCB area. |
| No Minimum Data Transfer Rate | Allows indefinite pause between SCK edges during data readout - simplifies firmware timing in resource-constrained MCUs. |
Applications
| Portable Instrumentation | Industrial Sensor Interface |
|---|---|
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings from multiple transducers. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from op-amp front-ends; performs sequential channel scanning via SDI command. Use Value: 12-bit resolution and 150 ksps throughput enable fast response while maintaining readability of 0.025% full-scale measurements. | Use Scenario: Remote RTD or thermocouple monitoring node in factory automation with 4–20 mA loop interface. IC Role / Device Role / Timing Role: High-impedance analog input stage converting isolated sensor voltages; uses differential mode to reject ground-loop noise. Use Value: ±1 LSB INL and auto-shutdown allow accurate, low-drift measurements with minimal self-heating in uncooled enclosures. |
| Isolated Data Acquisition | Battery-Powered Environmental Monitor |
Use Scenario: Galvanically isolated analog input module for PLC backplane or energy metering system. IC Role / Device Role / Timing Role: ADC core receiving signals across digital isolators; operates from isolated 3.3 V rail with local VCC-referenced conversion. Use Value: Internal VREF = VCC eliminates need for isolated reference voltage, reducing isolation channel count and cost. | Use Scenario: Wireless soil moisture and ambient temperature logger powered by coin-cell battery. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during scheduled wake-up intervals; sleeps between samples drawing <10 µA. Use Value: 10 µA shutdown current enables multi-year operation on CR2032 cells with periodic 150 ksps burst sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1861LIMS8#TRPBF | Same functionality but rated for –40°C to 85°C industrial temperature range vs. 0°C to 70°C for LTC1861LCS8#TRPBF. | Required for outdoor or under-hood deployments where extended thermal stability is critical. | Select LTC1861LIMS8#TRPBF when operating beyond commercial temperature limits; otherwise LTC1861LCS8#TRPBF suffices. |
| LTC1865LCS8#TRPBF | 16-bit resolution, same 150 ksps rate and SO-8 package, but higher 2.5 mW power dissipation and ±2 LSB INL. | Used where higher dynamic range is needed (e.g., audio preamp digitization), not just increased DC precision. | Choose LTC1865LCS8#TRPBF only if 16-bit resolution is mandatory; LTC1861LCS8#TRPBF offers better power efficiency for 12-bit requirements. |
Compared with LTC1861LIMS8#TRPBF, the LTC1861LCS8#TRPBF trades extended temperature rating for lower cost and identical performance at room temperature; versus LTC1865LCS8#TRPBF, it delivers 4× lower power and tighter INL at half the resolution - making it optimal for cost- and power-sensitive 12-bit systems.
Availability
LTC1861LCS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and battery-powered environmental monitors requiring stable component supply and long-term production continuity.
Supply support for LTC1861LCS8#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 legacy Linear parts including the LTC series.
The LTC1861L family was designed specifically for compact, low-power, high-speed data acquisition in space-constrained and battery-operated systems - emphasizing integration, supply flexibility, and ease of digital interfacing.
FAQ
What is the maximum clock frequency supported by the LTC1861LCS8#TRPBF SCK input?
The LTC1861LCS8#TRPBF supports a maximum SCK frequency of 8 MHz, as specified in the Recommended Operating Conditions table. This allows full 12-bit data transfer in under 1.5 µs, aligning with its 150 ksps sampling capability. Exceeding this limit may cause timing violations and invalid data reads from the SDO pin.
Does the LTC1861LCS8#TRPBF require an external reference voltage?
No - the LTC1861LCS8#TRPBF SO-8 package internally ties the VREF pin to VCC, making it self-referenced. This eliminates the need for external reference components in ratiometric applications where sensor excitation and ADC reference share the same supply rail.
How does the LTC1861LCS8#TRPBF configure its 2-channel multiplexer?
The LTC1861LCS8#TRPBF configures its MUX via a 2-bit word shifted into the SDI pin after the CONV signal falls. The bits define single-ended or differential mode and select polarity - e.g., "00" selects CH0–GND, "11" selects CH1–CH0 - as detailed in Table 1 of the LTC1861L datasheet.
What is the absolute input voltage range allowed on the CH0 and CH1 pins of the LTC1861LCS8#TRPBF?
The LTC1861LCS8#TRPBF specifies an absolute input range of –0.05 V to VCC + 0.05 V on CH0 and –0.05 V to VCC/2 on CH1. This asymmetry accommodates differential configurations while preventing internal node overstress - exceeding these limits risks latch-up or parametric degradation.
Can the LTC1861LCS8#TRPBF operate from a 2.5 V supply?
No - the LTC1861LCS8#TRPBF has a minimum supply voltage of 2.7 V per Absolute Maximum Ratings and Recommended Operating Conditions. Operation below 2.7 V may result in incomplete conversions, increased INL error, or failure to meet timing specifications such as tCONV ≤ 4.66 µs.
LTC1861LCS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1861LCS8#TRPBF FAQ
1.How can I place an order for LTC1861LCS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861LCS8#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 LTC1861LCS8#TRPBF reliable?
The price and inventory of LTC1861LCS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861LCS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1861LCS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861LCS8#TRPBF transactions.
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4.How is shipping managed for LTC1861LCS8#TRPBF?
LTC1861LCS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861LCS8#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 LTC1861LCS8#TRPBF?
For technical support, including LTC1861LCS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861LCS8#TRPBF requirements.
6.How does Aetrix verify that LTC1861LCS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1861LCS8#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 LTC1861LCS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1861LCS8#TRPBF?
All LTC1861LCS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861LCS8#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 LTC1861LCS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1861LCS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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