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Analog Devices Inc. LTC1861LIS8#TRPBF
- Part No.:
- LTC1861LIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1861LIS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
LTC1861LIS8#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 150ksps, 2-channel software-selectable multiplexed successive-approximation ADC operating from a single 3V supply in an 8-lead SOIC package. It features true differential input capability per channel, external reference pin (VREF), SPI/MICROWIRE-compatible 3-wire serial interface, and auto-shutdown reducing supply current to 10µA at 1ksps. It is used in low-power portable instrumentation requiring high-speed ratiometric or externally referenced analog-to-digital conversion.
For engineers reviewing the LTC1861LIS8#TRPBF datasheet, LTC1861LIS8#TRPBF pinout, LTC1861LIS8#TRPBF application, or LTC1861LIS8#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to this SO-8 variant.
Technical Context
The LTC1861LIS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold. Its 2-channel MUX is configured via a 2-bit word shifted into SDI after CONV falls, enabling single-ended or differential measurement modes as defined in Table 1 of the datasheet. Conversion timing is fixed at 3.7–4.66µs, independent of sampling rate.
It operates exclusively with VREF tied internally to VCC in the SO-8 package - unlike the MSOP version - resulting in a fixed full-scale span of VCC (2.7V to 3.6V). The analog inputs (CH0/CH1) are high-impedance (±1µA leakage), support input spans down to 1V full-scale, and reject common-mode noise via simultaneous sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes for precise amplitude quantization in sensor and control loops. |
| Max Sampling Rate | 150 ksps - supports real-time acquisition of signals up to ~30 kHz full-linear bandwidth without aliasing. |
| Supply Current @ 150ksps | 450 µA typical - enables battery operation for >1 year in 10mA·hr coin-cell systems sampling at 100Hz. |
| INL Error | ±1 LSB max - ensures monotonicity and <0.025% end-point linearity error across temperature for calibration-sensitive applications. |
| SNR / SINAD | 72 dB / 72 dB at 1kHz - provides >11.5 effective number of bits (ENOB) for clean signal digitization in noisy environments. |
| Reference Input | VREF internally tied to VCC - eliminates external reference component count but fixes full-scale to supply voltage (2.7–3.6V). |
| Digital Interface | SPI/MICROWIRE 3-wire (CONV, SCK, SDO) - simplifies host connection to microcontrollers and FPGAs without CS pin overhead. |
Pinout & Package
Package: 8-lead plastic SOIC (narrow, 0.150-inch width), JEDEC MS-012AC, 3.9mm × 4.9mm footprint, 1.27mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CONV | Convert Start Input | Active-high edge-triggered control: rising edge initiates conversion; falling edge enables SDO data readout and configures MUX via SDI (in MSOP only - not used in SO-8 variant). |
| 2 - CH0 | Analog Input Channel 0 | High-impedance input (±1µA leakage); used as IN+ or IN− depending on MUX configuration - supports rail-to-rail input when referenced to GND. |
| 3 - CH1 | Analog Input Channel 1 | Identical electrical characteristics to CH0; paired with CH0 for differential measurement or used independently in single-ended mode. |
| 4 - GND | Analog Ground | Single-point return for analog circuitry; must be tied directly to low-noise analog ground plane to maintain 72dB SNR performance. |
| 5 - VCC | Positive Supply | 2.7V to 3.6V single supply; powers analog and digital sections; also serves as internal VREF source in SO-8 package. |
| 6 - SCK | Serial Clock Input | DC to 8 MHz clock synchronizing full-duplex data transfer; timing-critical for setup/hold compliance (30ns min SDI timing in MSOP, not applicable here). |
| 7 - SDO | Serial Data Output | 3-state output enabled by CONV low; outputs 12-bit conversion result MSB-first on SCK falling edge; Hi-Z when CONV high. |
| 8 - VREF | Reference Input | No connection required - internally tied to VCC in SO-8 package; full-scale range = VCC; decoupling with 1µF tantalum to GND mandatory. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces ICC from 450µA @ 150ksps to 10µA @ 1ksps - cuts average power by >95% in burst-sampling systems. |
| True differential input architecture | Rejects common-mode noise on CH0/CH1 simultaneously - enables accurate measurement in electrically noisy industrial sensor interfaces. |
| Software-selectable 2-channel MUX | Configured via SDI in MSOP version; in SO-8, MUX is hardwired - CH0 and CH1 operate as independent single-ended inputs or as differential pair. |
| High impedance analog inputs | ±1µA max leakage allows direct connection to high-output-impedance sources (e.g., thermistors, RTDs) without buffer amplifiers. |
| No minimum data transfer rate | Permits ultra-low-power polling at arbitrary intervals - ideal for wake-on-event architectures using external microcontroller GPIO. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered ECG front-end acquiring two lead voltages (RA/LA) at 125Hz with 12-bit resolution. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing differential biopotential signals; CONV triggers synchronized sampling; SDO streams data to low-power MCU over SPI. Use Value: 450µA supply current extends AA battery life to >2 years; 72dB SNR preserves QRS complex fidelity; SO-8 footprint minimizes PCB area. |
Use Scenario: 4–20mA loop-powered transmitter measuring temperature and pressure using two RTD bridges. IC Role / Device Role / Timing Role: Simultaneous sampling of two ratiometric bridge outputs; VCC-referenced full-scale eliminates need for precision external reference. Use Value: ±1 LSB INL ensures <0.025% system accuracy; 150ksps headroom supports oversampling for noise reduction; GND/VCC pin separation reduces ground bounce. |
| Isolated Data Acquisition Modules | Low-Power Environmental Sensors |
Use Scenario: DIN-rail mounted sensor node with digital isolator separating field-side analog section from host-side MCU. IC Role / Device Role / Timing Role: Isolated-side ADC capturing transient events; CONV driven via optocoupler; SDO data serialized across isolation barrier. Use Value: 3.7µs conversion time enables sub-10µs event capture latency; 10µA sleep current minimizes isolated supply loading; SO-8 eases creepage/clearance layout. |
Use Scenario: Wireless soil moisture node using capacitive sensing with periodic 10-second wake-up and measurement cycle. IC Role / Device Role / Timing Role: Low-duty-cycle ADC powering up only during measurement window; auto-shutdown ensures <1µA average current between samples. Use Value: 10µA shutdown current enables >10-year battery life on CR2032; 1V min input span accommodates low-voltage sensor outputs; no external reference saves BOM cost. |
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 | Same SO-8 package and pinout; commercial temperature grade (0°C to 70°C) vs. industrial (–40°C to 85°C) for LTC1861LIS8#TRPBF. | Not suitable for extended-temperature deployments (e.g., outdoor industrial enclosures, automotive under-hood). | Select LTC1861LIS8#TRPBF when operation beyond 70°C is required; both share identical electrical specs and layout compatibility. |
| LTC1864LIS8#TRPBF | 16-bit resolution, same 150ksps speed, 3V supply, SO-8 package; higher SNR (86dB), lower INL (±0.5 LSB), but 1.22mW power vs. 1.35mW for LTC1861LIS8#TRPBF. | Used where higher resolution outweighs cost and power trade-offs - e.g., precision weigh scales, calibrated test equipment. | Choose LTC1861LIS8#TRPBF for cost-sensitive, 12-bit applications needing proven reliability and lower BOM cost; LTC1864LIS8#TRPBF only if 16-bit ENOB is mandatory. |
Compared with LTC1861LCS8, the LTC1861LIS8#TRPBF adds –40°C startup capability and extended thermal stability; compared with LTC1864LIS8#TRPBF, it trades 4-bit resolution for lower unit cost and simpler firmware handling of 12-bit data words.
Availability
LTC1861LIS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, isolated data acquisition modules, and low-power environmental sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1861LIS8#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 ICs for precision measurement, power management, and connectivity.
The LTC1861L series belongs to Linear's µPower precision ADC product line, designed specifically for compact, battery-operated, and isolated instrumentation systems demanding high speed, low quiescent current, and robust noise immunity in harsh environments.
FAQ
What is the reference voltage configuration for LTC1861LIS8#TRPBF?
The LTC1861LIS8#TRPBF uses an internal connection between VREF (Pin 8) and VCC (Pin 5) - no external reference is required or supported. Full-scale range equals the applied VCC voltage (2.7V to 3.6V), making it inherently ratiometric to the supply. This differs from the MSOP version, which accepts an external VREF.
Does LTC1861LIS8#TRPBF support differential input mode?
Yes, LTC1861LIS8#TRPBF supports true differential measurement between CH0 and CH1. When configured as differential, the ADC measures (CH0 – CH1) with 0V to VCC full-scale range. Common-mode rejection is achieved through simultaneous sampling, preserving integrity in noisy sensor environments.
What is the maximum clock frequency for the serial interface of LTC1861LIS8#TRPBF?
The maximum SCK frequency for LTC1861LIS8#TRPBF is 8 MHz, as specified in the Recommended Operating Conditions table. At this rate, the 12-bit conversion result is transferred in ≤1.5 µs, enabling tight timing integration with fast microcontrollers and FPGAs without additional wait states.
How does the auto-shutdown feature work in LTC1861LIS8#TRPBF?
In LTC1861LIS8#TRPBF, auto-shutdown activates automatically when CONV remains high after conversion completes. Supply current drops from 450 µA (at 150ksps) to 10 µA (at 1ksps) - scaling linearly with reduced sampling rate. This eliminates need for external power-gating circuitry in duty-cycled systems.
Is LTC1861LIS8#TRPBF pin-compatible with other members of the LTC186xL family?
LTC1861LIS8#TRPBF shares identical SO-8 pinout with LTC1860LIS8#TRPBF (1-channel) and LTC1861LCS8 (commercial temp), enabling drop-in replacement in existing layouts. However, it is not pin-compatible with MSOP variants (e.g., LTC1861LIMS) due to different pin count and function mapping (e.g., SDI, AGND/DGND).
LTC1861LIS8#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1861LIS8#TRPBF FAQ
1.How can I place an order for LTC1861LIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861LIS8#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 LTC1861LIS8#TRPBF reliable?
The price and inventory of LTC1861LIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861LIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1861LIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861LIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1861LIS8#TRPBF?
LTC1861LIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861LIS8#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 LTC1861LIS8#TRPBF?
For technical support, including LTC1861LIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861LIS8#TRPBF requirements.
6.How does Aetrix verify that LTC1861LIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1861LIS8#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 LTC1861LIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1861LIS8#TRPBF?
All LTC1861LIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861LIS8#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 LTC1861LIS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1861LIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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