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Analog Devices Inc. LTC1861LIS8#PBF
- Part No.:
- LTC1861LIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1861LIS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,365
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Product details
Overview
LTC1861LIS8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 150ksps, 2-channel software-selectable multiplexed successive-approximation ADC operating on a single 3V supply in an 8-lead SOIC package. It features true differential input capability per channel, external reference support (VREF pin), SPI/MICROWIRE-compatible 3-wire serial interface, and auto-shutdown reducing supply current to 10µA at 1ksps - ideal for low-power portable instrumentation with isolated analog front-ends.
For engineers reviewing the LTC1861LIS8#PBF datasheet, LTC1861LIS8#PBF pinout, LTC1861LIS8#PBF application, or LTC1861LIS8#PBF equivalent, key selection criteria include its 12-bit resolution with ±1 LSB INL, 72dB SNR at 1kHz, 10MHz full-power bandwidth, differential MUX configuration flexibility, and SO-8 footprint compatibility with legacy 3V ADCs like LTC1864L/LTC1865L.
Technical Context
The LTC1861LIS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential input modes via a 2-bit SDI configuration word. Its conversion cycle is initiated by a rising edge on CONV, with tCONV = 3.7–4.66µs and full 12-bit data output on SDO synchronized to SCK falling edges.
It operates with VCC = 2.7–3.6V and accepts VREF from 1V to VCC (SO-8 version ties VREF internally to VCC). Input leakage is ±1µA, CIN is 12pF in sample mode, and digital I/O meets standard CMOS voltage thresholds with VIH ≥ 1.9V (VCC = 3.3V) and VOL ≤ 0.3V (IO = 400µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in precision sensing. |
| Max Sampling Rate | 150ksps - supports real-time acquisition of signals up to ~30kHz full-linear bandwidth (S/(N+D) ≥ 68dB). |
| Supply Current | 450µA typical at 150ksps; drops to 10µA at 1ksps via auto-shutdown - enables battery life extension in portable systems. |
| INL Error | ±1 LSB over full temperature range - ensures monotonicity and accurate end-point linearity without calibration. |
| SNR / THD | 72dB SNR and –86dB THD at 1kHz - suitable for medium-dynamic-range applications like sensor readout and industrial monitoring. |
| Analog Input Range | Differential: 0V to VREF; Absolute: IN+ = –0.05V to VCC+0.05V, IN– = –0.05V to VCC/2 - allows direct connection to transducers with minimal signal conditioning. |
| Reference Support | VREF pin accepts 1V–VCC (SO-8 variant uses internal VCC tie) - enables ratiometric measurements or precision external references (e.g., LT1460). |
Pinout & Package
Package: 8-lead plastic SOIC (narrow, 0.150-inch width), JEDEC MS-012AC, 3.9mm × 4.9mm body, 1.27mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CONV | Convert Start Input | Rising edge initiates conversion; held high after completion to enter sleep mode; low enables SDO output. |
| 2: CH0 | Analog Input Channel 0 (+) | Positive input for channel 0 in single-ended or differential mode; referenced to AGND. |
| 3: CH1 | Analog Input Channel 1 (+) | Positive input for channel 1; paired with CH0 or GND depending on SDI configuration word. |
| 4: GND | Analog Ground | Single-point analog return path; must connect directly to low-noise analog ground plane. |
| 5: VCC | Positive Supply | 2.7–3.6V single supply; requires ≥1µF tantalum bypass to GND for stable conversion performance. |
| 6: SCK | Serial Clock Input | Synchronizes full-duplex data transfer; max 8MHz clock frequency; controls timing of SDO output and SDI sampling. |
| 7: SDO | Serial Data Output | 12-bit result shifted out MSB-first on falling SCK edge; tri-stated when CONV is high. |
| 8: SDI | Serial Data Input | Accepts 2-bit MUX configuration word on rising SCK edges after CONV falls; defines CH0/CH1 polarity and mode. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Configurable via 2-bit SDI word to support four combinations: CH0–GND, CH1–GND, CH0–CH1, CH1–CH0 - eliminates need for external analog switches. |
| True Differential Input Architecture | Rejects common-mode noise on matched input pairs; maintains 72dB SNR even with moderate source impedance mismatches. |
| Auto-Power-Down Between Conversions | Reduces ICC from 450µA @ 150ksps to 10µA @ 1ksps - cuts average power by >97% in burst-sampling applications. |
| SPI/MICROWIRE-Compatible Interface | 3-wire serial protocol with no minimum data rate requirement - simplifies integration with low-speed MCUs and FPGAs. |
| High-Z Output Control & Timing Guarantees | SDO enters high-impedance state within 55–120ns of CONV↑; tCONV tightly specified (3.7–4.66µs) - enables deterministic system-level timing. |
Applications
| Portable Sensor Data Logger | Isolated Industrial Transducer Interface |
|---|---|
Use Scenario: Battery-powered environmental monitor acquiring temperature, humidity, and pressure from multiple analog sensors. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes conditioned sensor outputs sequentially using software MUX control; CONV-triggered sampling ensures precise timing alignment. Use Value: 450µA active current and 10µA sleep current extend AA battery life to >1 year in 1-second sampling intervals. |
Use Scenario: DIN-rail mounted PLC module measuring 4–20mA current loops and thermocouple inputs across galvanically isolated barriers. IC Role / Device Role / Timing Role: ADC interfaces with isolated sigma-delta modulators or op-amp isolators; differential inputs reject ground-loop noise in noisy factory environments. Use Value: ±1 LSB INL and 72dB SNR ensure <0.025% measurement accuracy over –40°C to +85°C industrial temperature range. |
| Compact Medical Vital Sign Monitor | Low-Power Remote Telemetry Node |
Use Scenario: Wearable ECG/PPG patch capturing biopotential signals with minimal form factor and heat generation. IC Role / Device Role / Timing Role: Digitizes amplified, filtered analog bio-signals; low 1.22mW power dissipation prevents skin heating during continuous operation. Use Value: 12-bit resolution and 30kHz full-linear bandwidth preserve waveform fidelity for heart-rate variability and arrhythmia analysis. |
Use Scenario: Wireless soil moisture and pH sensor node transmitting data via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: ADC wakes on timer interrupt, samples two sensor channels, completes conversion in <5µs, then returns to shutdown. Use Value: Auto-shutdown and no-minimum-clock-rate interface minimize MCU interaction time and RF transmission latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, low-power, serial-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1864LCS8#PBF | 16-bit resolution, same SO-8 package and pinout, 150ksps, but higher 1.25mA supply current at full speed. | Higher resolution required for precision metrology; less suitable for ultra-low-power battery use. | Select when 16-bit accuracy outweighs 2.8× higher active current; not drop-in due to different reference handling and timing. |
| ADS7822U | 12-bit, 200ksps, 8-pin SOIC, SPI interface, but requires external reference and has ±3 LSB INL (vs ±1 LSB). | Cost-sensitive industrial control where ±0.1% linearity suffices; lacks integrated MUX and auto-shutdown. | Choose for lower BOM cost where reduced linearity and fixed single-channel operation are acceptable. |
Compared with LTC1861LIS8#PBF, LTC1864LCS8#PBF offers higher resolution at the expense of power efficiency, while ADS7822U trades linearity and feature set for cost - making LTC1861LIS8#PBF optimal for balanced performance in space-constrained, battery-aware designs.
Availability
LTC1861LIS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated industrial data acquisition, and low-power remote telemetry requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1861LIS8#PBF 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 high-performance analog IC portfolio, emphasizing precision, low power, and reliability for demanding signal chain applications.
The LTC1861L series belongs to Linear's µPower SAR ADC product line, designed specifically for compact, battery-operated, and isolated measurement systems where resolution, speed, and power efficiency must coexist without compromise.
FAQ
What is the maximum sampling frequency supported by the LTC1861LIS8#PBF?
The LTC1861LIS8#PBF supports a maximum sampling frequency of 150ksps, with guaranteed conversion time (tCONV) of 3.7–4.66µs across the full operating temperature range. This enables reliable acquisition of signals with up to ~30kHz full-linear bandwidth while maintaining 72dB SNR and ±1 LSB INL performance.
Does the LTC1861LIS8#PBF require an external reference voltage?
Yes - the LTC1861LIS8#PBF provides an external VREF pin that defines the full-scale input range. In the SO-8 package (including LTC1861LIS8#PBF), VREF is internally tied to VCC, so the span equals VCC. For flexible ratiometric or precision measurement, an external reference (e.g., LT1460) can be used with the MSOP variant, but not with this SO-8 part.
How does the 2-channel MUX operate on the LTC1861LIS8#PBF?
The LTC1861LIS8#PBF uses a 2-bit configuration word shifted into SDI after CONV falls to select between four input configurations: CH0–GND, CH1–GND, CH0–CH1, or CH1–CH0. This software-selectable MUX eliminates external analog switches and supports both single-ended and true differential measurements without hardware changes.
What is the supply current of the LTC1861LIS8#PBF at 1ksps?
At 1ksps, the LTC1861LIS8#PBF draws only 10µA typical supply current due to its automatic power-down feature between conversions. This ultra-low sleep current significantly extends battery life in intermittent-sampling applications such as wireless sensor nodes and portable diagnostic tools.
Is the LTC1861LIS8#PBF pin-compatible with other members of the LTC186x family?
Yes - the LTC1861LIS8#PBF shares the same SO-8 pinout with LTC1860LIS8#PBF (1-channel), LTC1864LCS8#PBF (16-bit, 1-channel), and LTC1865LCS8#PBF (16-bit, 2-channel), enabling layout reuse and migration paths. However, register maps, timing, and reference behavior differ, so firmware and schematic review is required for substitution.
LTC1861LIS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1861LIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861LIS8#PBF 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#PBF reliable?
The price and inventory of LTC1861LIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861LIS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1861LIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861LIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1861LIS8#PBF?
LTC1861LIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861LIS8#PBF 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#PBF?
For technical support, including LTC1861LIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861LIS8#PBF requirements.
6.How does Aetrix verify that LTC1861LIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1861LIS8#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1861LIS8#PBF?
All LTC1861LIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861LIS8#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1861LIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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