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Analog Devices Inc. LTC1860LCS8#PBF
- Part No.:
- LTC1860LCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1860LCS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
LTC1860LCS8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 150ksps single-channel successive approximation ADC with true differential analog input, external reference pin, and SPI/MICROWIRE-compatible 3-wire serial interface. It operates on a single 2.7V–3.6V supply, draws only 450µA at full speed, and auto-shuts down between conversions to reduce 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 LTC1860LCS8#PBF datasheet, LTC1860LCS8#PBF pinout, LTC1860LCS8#PBF application, or LTC1860LCS8#PBF equivalent, key selection criteria include its 12-bit no-missing-codes performance, differential input architecture, SO-8 package compatibility, 3.7µs conversion time, and support for ratiometric or external reference configurations - all critical for precision sensor interfacing and isolated measurement designs.
Technical Context
The LTC1860LCS8#PBF employs a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise unipolar differential measurements across a 0V to VREF input range. Its analog front-end supports high-impedance sources and reduced spans down to 1V full-scale without external gain stages.
It uses a 3-wire serial interface (CONV, SCK, SDO) with no minimum data transfer rate requirement; conversion is initiated by a rising edge on CONV, and data is clocked out on falling SCK edges. The device powers down automatically when CONV remains high post-conversion, minimizing idle current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and full code coverage for precision measurement applications. |
| Sampling Rate | 150ksps maximum - supports real-time acquisition of signals up to ~30kHz full-linear bandwidth. |
| Supply Current | 450µA typical at 150ksps; drops to 10µA at 1ksps - enables multi-year battery life in portable instrumentation. |
| INL Error | ±1 LSB over temperature - maintains accuracy without calibration in industrial sensor nodes. |
| Reference Range | 1V to VCC (3.6V max) - allows flexible scaling from low-voltage sensors to rail-to-rail inputs when VREF = VCC. |
| Conversion Time | 3.7µs typical - defines minimum inter-conversion interval and supports tight timing control in synchronous systems. |
| SNR / THD | 72dB SNR, –86dB THD at 1kHz - suitable for medium-fidelity signal digitization in medical and test equipment. |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150-inch body), RoHS-compliant, lead-free (Pb-free) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; must be low-noise and stable; supports 1V–VCC range; tied internally to VCC only in LTC1861L SO-8 variant. |
| IN+ (Pin 2) | Differential Analog Input (+) | Positive input of true differential pair; accepts voltage relative to IN–; common-mode rejection improves noise immunity. |
| IN– (Pin 3) | Differential Analog Input (–) | Negative input of differential pair; zero code occurs when IN+ – IN– = 0V; enables ratiometric sensing with bridge transducers. |
| GND (Pin 4) | Analog Ground | Primary ground reference for analog circuitry; must connect directly to analog ground plane with minimal impedance. |
| VCC (Pin 8) | Positive Supply | 2.7V–3.6V single supply; requires local 1µF tantalum bypass to GND for stable conversion performance. |
| SCK (Pin 7) | Serial Clock Input | Controls timing of serial data transfer; supports up to 8MHz clock frequency; no minimum rate required. |
| SDO (Pin 6) | Serial Data Output | 3-wire output-only interface; outputs 12-bit result MSB-first on falling SCK edge; tri-stated when CONV high. |
| CONV (Pin 5) | Convert Control Input | Rising edge initiates conversion; falling edge enables SDO output; high state after conversion triggers auto-shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Input Architecture | Rejects common-mode noise on IN+/IN– pair, enabling accurate measurements in electrically noisy environments like motor control feedback loops. |
| Auto-Power-Down Between Conversions | Reduces average supply current from 450µA to 10µA at low sampling rates - extends battery life without software intervention. |
| External Reference Flexibility | Accepts 1V–VCC reference voltage, allowing direct use of low-drift references (e.g., LT1460) or ratiometric operation with sensor excitation supplies. |
| SO-8 Pin Compatibility with 16-Bit LTC1864L/LTC1865L | Enables drop-in upgrade path to higher resolution while retaining same PCB layout and footprint - reduces redesign effort. |
| No Minimum Data Transfer Rate | Permits ultra-low-power polling or burst-mode acquisition without clocking constraints - ideal for microcontroller-based sleep/wake architectures. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered handheld blood glucose meter acquiring analog output from electrochemical sensor. IC Role / Device Role / Timing Role: Precision 12-bit ADC digitizing low-level mV-range differential sensor output with ratiometric reference derived from sensor bias supply. Use Value: 450µA supply current at 150ksps enables >2-year battery life; differential input rejects EMI from display backlight and RF modules. |
Use Scenario: DIN-rail mounted temperature transmitter converting RTD/thermocouple signals for 4–20mA loop or digital fieldbus output. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing with precision op-amp signal conditioning stage and isolated SPI interface to microcontroller. Use Value: ±1 LSB INL and 72dB SNR ensure <0.1% measurement uncertainty; SO-8 package simplifies conformal coating and isolation barrier design. |
| Isolated Data Acquisition Modules | Low-Power Environmental Sensor Nodes |
Use Scenario: High-voltage AC line monitoring module using opto-isolated or capacitive-isolated serial interface to host MCU. IC Role / Device Role / Timing Role: Isolated-side ADC capturing voltage/current waveforms with external reference referenced to isolated ground. Use Value: 3.7µs conversion time enables 12-bit sampling at 50/60Hz harmonics; no minimum SCK rate allows safe, slow isolated clocking. |
Use Scenario: Wireless soil moisture sensor node powered by coin cell, transmitting readings every 10 minutes via BLE or LoRa. IC Role / Device Role / Timing Role: Ultra-low-power ADC activated only during measurement burst, then fully shut down until next wake-up event. Use Value: 10µA shutdown current minimizes quiescent drain; 1V–VCC reference range supports direct use of LDO output as reference for simplified BOM. |
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 |
|---|---|---|---|
| LTC1864LCS8#PBF | 16-bit resolution, same 150ksps rate, identical SO-8 pinout and serial interface, but higher 1.22mW power dissipation at full speed. | Used where higher dynamic range is required (e.g., audio preamps, vibration analysis), not where 12-bit suffices and power budget is constrained. | Select LTC1860LCS8#PBF when 12-bit resolution meets system accuracy needs and sub-500µA active current is mandatory. |
| LTC1401CS8#PBF | 12-bit, 200ksps, internal 2.56V reference, no external VREF pin, SO-8 package, 15mW power at full speed. | Preferred for cost-sensitive, self-contained designs where external reference flexibility is unnecessary and higher power is acceptable. | Select LTC1860LCS8#PBF when external reference control, lower power, or differential input is required - LTC1401 lacks both. |
Compared with LTC1864LCS8#PBF, the LTC1860LCS8#PBF trades 4-bit resolution for 3.7× lower active power and simpler reference management; compared with LTC1401CS8#PBF, it adds external reference support and differential input at half the power, enabling more flexible and efficient sensor interfacing.
Availability
LTC1860LCS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and low-power environmental sensing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LTC1860LCS8#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; Linear originally designed high-performance analog ICs including precision ADCs, references, and power management solutions.
The LTC1860L series was developed for ultra-low-power, high-speed data acquisition in space- and energy-constrained systems - targeting portable medical devices, industrial sensors, and isolated measurement front-ends.
FAQ
What is the maximum sampling frequency of the LTC1860LCS8#PBF?
The LTC1860LCS8#PBF supports a maximum sampling frequency of 150ksps, with a typical conversion time of 3.7µs. This rate is achievable across the full operating temperature range (0°C to 70°C for the 'C' grade) when powered from a 2.7V–3.6V supply and using an SCK clock up to 8MHz. Performance remains stable under varying load conditions due to its internal sample-and-hold and auto-calibration design.
Does the LTC1860LCS8#PBF require an external reference voltage?
Yes, the LTC1860LCS8#PBF requires an external reference voltage applied to the VREF pin (Pin 1). It supports reference voltages from 1V up to VCC (max 3.6V), enabling ratiometric operation with sensor excitation supplies or use with precision external references like the LT1460. Unlike some variants (e.g., LTC1401), it does not include an internal reference.
Can the LTC1860LCS8#PBF operate with a 2.5V supply?
Yes, the LTC1860LCS8#PBF operates over a supply range of 2.7V to 3.6V per Absolute Maximum Ratings and Recommended Operating Conditions. A 2.5V supply falls below the 2.7V minimum and is not supported; operation at 2.5V may cause parametric failure, increased INL error, or intermittent functionality. Designers should use ≥2.7V supplies, such as standard 3.0V or 3.3V LDO outputs.
What is the purpose of the CONV pin on the LTC1860LCS8#PBF?
The CONV pin (Pin 5) serves dual functions: a rising edge initiates analog-to-digital conversion, and its logic level controls power state and data output enable. When held high after conversion completion, the LTC1860LCS8#PBF enters auto-shutdown mode (drawing ~10µA). When pulled low, the SDO pin becomes active, allowing serial readout of the 12-bit result synchronized to SCK.
Is the LTC1860LCS8#PBF pin-compatible with other members of the LTC186x family?
Yes, the LTC1860LCS8#PBF is pin-compatible with the 16-bit LTC1864LCS8#PBF in the SO-8 package, sharing identical pin assignments for VREF, IN+, IN–, GND, VCC, SCK, SDO, and CONV. This allows hardware reuse and migration paths. However, it is not pin-compatible with the LTC1861L (2-channel MUX version) or MSOP-packaged variants due to differing pin counts and functions.
LTC1860LCS8#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:
- 1
- 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:
- -
LTC1860LCS8#PBF FAQ
1.How can I place an order for LTC1860LCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1860LCS8#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 LTC1860LCS8#PBF reliable?
The price and inventory of LTC1860LCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1860LCS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1860LCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1860LCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1860LCS8#PBF?
LTC1860LCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1860LCS8#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 LTC1860LCS8#PBF?
For technical support, including LTC1860LCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1860LCS8#PBF requirements.
6.How does Aetrix verify that LTC1860LCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1860LCS8#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 LTC1860LCS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1860LCS8#PBF?
All LTC1860LCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1860LCS8#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 LTC1860LCS8#PBF part is unused and in its original packaging.
Return procedure for LTC1860LCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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