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Analog Devices Inc. LTC1861LCMS#PBF
- Part No.:
- LTC1861LCMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1861LCMS#PBF.pdf
- Description:
- IC ADC 12BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
LTC1861LCMS#PBF 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 portable instrumentation.
For engineers reviewing the LTC1861LCMS#PBF datasheet, LTC1861LCMS#PBF pinout, LTC1861LCMS#PBF application, or LTC1861LCMS#PBF equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery-powered data acquisition, and validated alternative options - all grounded in the official Linear Technology LTC1860L/LTC1861L datasheet (18601Lf) and package drawings.
Technical Context
The LTC1861LCMS#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential input configurations via a 2-bit software-configurable MUX clocked on SDI. Its conversion timing is fixed at 3.7–4.66µs, synchronized to CONV rising edge, with data output on SDO aligned to SCK falling edge in full-duplex mode.
It operates across 0°C to 70°C (indicated by 'C' suffix), uses separate AGND/DGND pins in MSOP, accepts reference voltages from 1V to VCC, and achieves 72dB SNR and –86dB THD at 1kHz while maintaining ±1 LSB INL and ±20mV gain error over temperature - enabling precision ratiometric measurements without external gain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for sub-0.025% full-scale quantization in sensor signal digitization. |
| Sampling Rate | 150ksps maximum - supports real-time capture of signals up to 30kHz full-linear bandwidth (S/(N+D) ≥ 68dB). |
| Supply Voltage | 2.7V to 3.6V - compatible with standard Li-ion and 3.3V logic rails, eliminating need for dedicated analog supplies. |
| Supply Current | 450µA typ at 150ksps; drops to 10µA at 1ksps - enables multi-year battery life in remote monitoring nodes. |
| INL / DNL | ±1 LSB INL, ±1 LSB DNL - ensures monotonicity and accurate end-point linearity for closed-loop control feedback. |
| Reference Range | 1V to VCC (MSOP version) - allows flexible scaling from low-voltage sensor outputs (e.g., 1.2V thermistor bridges) to rail-to-rail spans. |
| Serial Interface | SPI/MICROWIRE-compatible 3-wire - interoperates directly with ARM Cortex-M, MSP430, and FPGA GPIO without level shifters. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, JEDEC MO-187 variant (LTC DWG #05-08-1660). RoHS-compliant, lead-free, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span (1V to VCC); must be bypassed with ≥1µF tantalum to AGND for <±0.5 LSB noise-induced error. |
| IN+ (Pin 2) | Analog Input (+) | Positive terminal of differential pair or single-ended channel 0 input; high-impedance (>1GΩ), ≤12pF capacitance in sample mode. |
| IN– (Pin 3) | Analog Input (–) | Negative terminal of differential pair or single-ended channel 1 input; supports common-mode rejection when driven differentially. |
| GND (Pin 4) | Analog Ground | Primary ground reference for analog circuitry; requires low-inductance connection to system analog ground plane. |
| VCC (Pin 5) | Positive Supply | 2.7V–3.6V analog/digital supply; bypassing directly to GND is mandatory to prevent sampling errors from supply ripple. |
| SCK (Pin 6) | Serial Clock Input | Accepts DC–8MHz clock; timing-critical for data capture - SDO data valid 45–55ns after SCK↓, captured on next SCK↑. |
| SDO (Pin 7) | Serial Data Output | 3-state output enabled by CONV low; transmits 12-bit result MSB-first on SCK falling edge; Hi-Z when CONV high. |
| CONV (Pin 8) | Convert Control Input | Rising edge initiates conversion; falling edge enables SDO and configures MUX via SDI (in LTC1861L); auto-shutdown if held high post-conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Configured via 2-bit word on SDI before each conversion - enables dynamic switching between CH0/CH1 in single-ended or differential modes without hardware change. |
| Auto shutdown at low sampling rates | Reduces ICC from 450µA to 10µA at 1ksps - cuts average power by >97% in event-triggered or burst-mode sensing applications. |
| True differential input architecture | Rejects common-mode noise up to 30kHz bandwidth - eliminates need for external instrumentation amplifiers in noisy industrial environments. |
| No minimum data transfer rate | Permits indefinite idle periods between conversions - simplifies firmware design for ultra-low-duty-cycle wake-up systems (e.g., IoT node sleep/wake cycles). |
| High-impedance analog inputs (±1µA leakage) | Allows direct connection to high-impedance sources like thermocouples or pH electrodes without buffer op-amps or gain stages. |
Applications
| Portable Instrumentation | Battery-Powered Sensor Node |
|---|---|
|
Use Scenario: Handheld multimeter measuring voltage, current, and resistance with autoranging and LCD display. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog front-end signals; CONV triggered per measurement cycle; SDO/SCK synchronized to microcontroller's SPI peripheral. Use Value: 12-bit resolution and 150ksps sampling enable fast autoranging and stable readings; 450µA supply current extends AA battery life to >12 months in typical usage. |
Use Scenario: Wireless temperature/humidity node logging data every 10 seconds and transmitting via BLE. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor outputs during brief wake-up bursts; auto-shutdown between samples minimizes quiescent draw. Use Value: 10µA sleep current and no minimum clock rate allow microcontroller to remain in deep-sleep mode until CONV pulse - reducing system-wide average current to <5µA. |
| Isolated Data Acquisition | Compact Industrial Monitoring |
|
Use Scenario: DIN-rail mounted module measuring 4–20mA loop signals across galvanic isolation barrier. IC Role / Device Role / Timing Role: Isolated-side ADC receiving analog signals from isolated amplifier; referenced to local VREF for ratiometric accuracy against isolated supply. Use Value: External VREF support (1V–VCC) enables precise matching to isolated DC-DC output tolerance; differential inputs reject common-mode noise induced by isolation transformers. |
Use Scenario: PLC analog input card digitizing 0–10V process signals from pressure and flow transmitters. IC Role / Device Role / Timing Role: Dual-channel ADC scanning multiple sensors sequentially via software MUX; interfaced to FPGA for real-time preprocessing. Use Value: Pin-compatible upgrade path from LTC1298; same MSOP footprint allows drop-in replacement while doubling throughput and halving power vs legacy parts. |
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#PBF | Same silicon, –40°C to 85°C extended temperature range; higher max supply current (1.0mA typ at 150ksps). | Required for automotive under-hood or industrial outdoor deployments where ambient exceeds 70°C. | Select when operating temperature exceeds 70°C; otherwise LTC1861LCMS#PBF offers lower cost and identical performance at 0°C–70°C. |
| LTC1864LCMS#PBF | 16-bit resolution, same 150ksps, 3V supply, but higher power (1.22mW vs 1.365mW at 150ksps) and larger 10-lead MSOP package. | Used where 16-bit precision is mandatory (e.g., high-resolution weigh scales), accepting higher BOM cost and layout area. | Choose only when 12-bit resolution is insufficient; LTC1861LCMS#PBF provides optimal balance of speed, power, size, and cost for general-purpose 12-bit needs. |
Compared with LTC1861LIMS#PBF, the LTC1861LCMS#PBF trades extended temperature capability for lower cost and identical electrical specs at commercial grade; versus LTC1864LCMS#PBF, it delivers 4× faster effective throughput per µW while occupying 20% less PCB area - making it ideal for space- and power-constrained portable designs.
Availability
LTC1861LCMS#PBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and compact industrial monitoring requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LTC1861LCMS#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1860L/LTC1861L family was designed specifically for ultra-low-power, high-speed data acquisition in space-constrained, battery-operated systems - emphasizing minimal supply current, small MSOP packaging, and flexible reference and input configurations.
FAQ
What is the operating temperature range of the LTC1861LCMS#PBF?
The LTC1861LCMS#PBF is rated for 0°C to 70°C ambient operation, as indicated by the 'C' suffix in the part number. This commercial-grade temperature range is validated per the LTC1860L/LTC1861L datasheet (18601Lf) and applies to all electrical specifications unless otherwise noted. For extended industrial use (–40°C to 85°C), the LTC1861LIMS#PBF variant is specified.
Does the LTC1861LCMS#PBF require an external reference voltage?
Yes - the LTC1861LCMS#PBF requires an external reference voltage applied to the VREF pin (Pin 1). The MSOP version supports VREF from 1V to VCC (2.7V–3.6V), enabling ratiometric measurements or precision scaling. Unlike the SO-8 variant, the MSOP does not tie VREF internally to VCC, giving full flexibility to optimize SNR and input range.
How many analog input channels does the LTC1861LCMS#PBF support?
The LTC1861LCMS#PBF supports two analog input channels (CH0 and CH1), selectable via a 2-bit configuration word shifted into SDI before each conversion. It operates in either single-ended mode (each channel referenced to GND) or differential mode (CH0–CH1 or CH1–CH0), as defined in Table 1 of the datasheet - distinguishing it from the single-channel LTC1860L.
What is the function of the CONV pin on the LTC1861LCMS#PBF?
The CONV pin (Pin 8) serves three critical roles on the LTC1861LCMS#PBF: (1) its rising edge initiates conversion; (2) its falling edge enables the SDO output and clocks the 2-bit MUX configuration from SDI; and (3) if held high after conversion completes, it places the device into auto-shutdown mode, reducing supply current to 10µA - a key enabler of ultra-low-power operation.
Is the LTC1861LCMS#PBF pin-compatible with other members of the LTC186x family?
Yes - the LTC1861LCMS#PBF shares the same 8-lead MSOP (MS8) footprint and pinout as the LTC1860LCMS#PBF, LTC1864LCMS#PBF, and LTC1865LCMS#PBF. However, functional differences exist: LTC1860L is single-channel, LTC1864/65L are 16-bit, and MUX behavior is unique to LTC1861L. Hardware layout is interchangeable; firmware must match channel and resolution requirements.
LTC1861LCMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1861LCMS#PBF FAQ
1.How can I place an order for LTC1861LCMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1861LCMS#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 LTC1861LCMS#PBF reliable?
The price and inventory of LTC1861LCMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1861LCMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1861LCMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1861LCMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1861LCMS#PBF?
LTC1861LCMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1861LCMS#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 LTC1861LCMS#PBF?
For technical support, including LTC1861LCMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1861LCMS#PBF requirements.
6.How does Aetrix verify that LTC1861LCMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1861LCMS#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 LTC1861LCMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1861LCMS#PBF?
All LTC1861LCMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1861LCMS#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 LTC1861LCMS#PBF part is unused and in its original packaging.
Return procedure for LTC1861LCMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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