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Analog Devices Inc. LTC1860LIS8#PBF
- Part No.:
- LTC1860LIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1860LIS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1860LIS8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, single-channel, successive-approximation analog-to-digital converter (SAR ADC) operating from a single 3V supply in an 8-lead SOIC package. It delivers 150ksps sampling rate with only 450µA typical supply current, features true differential analog inputs (IN+, IN–), external reference input (VREF), and SPI/MICROWIRE-compatible 3-wire serial interface - ideal for low-power, space-constrained data acquisition in portable instrumentation.
For engineers reviewing the LTC1860LIS8#PBF datasheet, LTC1860LIS8#PBF pinout, LTC1860LIS8#PBF application, or LTC1860LIS8#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts - all grounded in official Linear Technology documentation and product family specifications.
Technical Context
The LTC1860LIS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold. Its conversion cycle is initiated by a rising edge on CONV, completes in 3.7–4.66µs, and automatically enters sleep mode (10µA at 1ksps) when CONV remains high post-conversion.
It supports ratiometric operation or external reference voltages from 1V to VCC (2.7–3.6V), accepts differential input spans up to VREF, and maintains high-impedance analog inputs (±1µA leakage) with 12pF input capacitance in sample mode - enabling direct connection to low-output-impedance sensors without gain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 distinct output codes with no missing codes across full temperature range. |
| Sampling Rate | 150 ksps maximum - supports real-time acquisition of signals up to ~30 kHz full-linear bandwidth. |
| Supply Current | 450 µA typical at 150 ksps; drops to 10 µA at 1 ksps - enables battery life extension via automatic power-down between conversions. |
| INL Error | ±1 LSB max - ensures monotonicity and ≤0.024% full-scale linearity error for precision measurement systems. |
| SNR | 72 dB - corresponds to ~11.9 effective number of bits (ENOB) at 1 kHz input, suitable for medium-accuracy sensor digitization. |
| Input Range | Differential: 0 to VREF; Absolute: IN+ = –0.05V to VCC+0.05V, IN– = –0.05V to VCC/2 - allows rail-to-rail unipolar operation when IN– = GND and VREF = VCC. |
| Serial Interface | SPI/MICROWIRE-compatible 3-wire (SCK, SDO, CONV); no minimum clock rate required - simplifies host MCU firmware and supports variable-speed data reads. |
Pinout & Package
Package: 8-lead plastic SOIC (narrow, 0.150-inch width), JEDEC MS-012 variant, body size 4.90 × 3.90 mm, lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; accepts 1V to VCC; must be bypassed with ≥1µF tantalum to AGND for noise immunity during conversion. |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance input (±1µA leakage); sampled simultaneously with IN– to reject common-mode noise. |
| IN– (Pin 3) | Differential Analog Input (–) | Accepts 0V to VCC/2 absolute voltage; enables true differential or unipolar (IN– = GND) configurations. |
| GND (Pin 4) | Analog Ground | Single-point connection point for analog return; must tie directly to analog ground plane with minimal trace length. |
| VCC (Pin 8) | Positive Supply | 2.7V to 3.6V operation; requires local 1µF bypass to GND; ripple >10mVpp degrades SNR and INL. |
| SCK (Pin 7) | Serial Clock Input | Accepts DC to 8 MHz; rising edge clocks SDI (not used in LTC1860L), falling edge outputs SDO data. |
| SDO (Pin 6) | Serial Data Output | 3-state output enabled by CONV low; outputs 12-bit MSB-first word synchronized to SCK falling edge. |
| CONV (Pin 5) | Convert Control Input | Rising edge initiates conversion; falling edge enables SDO; high state after conversion triggers auto-sleep mode. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces supply current from 450µA @ 150ksps to 10µA @ 1ksps - eliminates need for external power-gating logic in duty-cycled systems. |
| True differential analog input | Rejects common-mode noise up to full bandwidth; enables accurate measurement of small differential signals superimposed on large common-mode offsets. |
| Flexible reference support | Operates with external references from 1V to VCC - permits ratiometric sensing (e.g., bridge transducers) or precision fixed-span operation using LT1460/LT1790 references. |
| No minimum data transfer rate | Allows indefinite pauses between SCK edges during readout - simplifies timing-critical MCU firmware and accommodates variable-latency interrupt handlers. |
| High impedance analog inputs | ±1µA input leakage and 12pF sampling capacitance permit direct connection to low-output-impedance sources (<200Ω) without buffer amplifiers. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure over weeks using coin-cell or Li-ion supply. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from MEMS sensors and thermistors at 1–10ksps burst rates. Use Value: 450µA active current and 10µA sleep current extend battery life; differential inputs reject PCB-level noise in compact layouts. |
Use Scenario: DIN-rail mounted condition monitoring module acquiring vibration and current signatures from motors and pumps. IC Role / Device Role / Timing Role: High-fidelity front-end ADC capturing transient waveforms up to 30kHz linear bandwidth for FFT-based diagnostics. Use Value: 72dB SNR and ±1 LSB INL ensure accurate amplitude/frequency analysis; SOIC package supports automated assembly and thermal relief. |
| Isolated Remote I/O Modules | Medical Vital Sign Sensors |
Use Scenario: 4–20mA loop-powered field transmitter with galvanic isolation, converting analog process signals to digital for PLC communication. IC Role / Device Role / Timing Role: Isolated-side ADC referenced to local VREF, interfacing with isolated SPI bus via optocouplers or digital isolators. Use Value: External VREF support enables precise ratiometric scaling against isolated reference; 3-wire interface minimizes isolation channel count. |
Use Scenario: Wearable ECG/PPG patch measuring biopotentials with ultra-low power budget and strict EMC requirements. IC Role / Device Role / Timing Role: Low-noise, low-current ADC sampling amplified bio-signals at 1–2ksps with programmable gain amplifier (PGA) front-end. Use Value: 12pF input capacitance and high-Z inputs reduce loading on sensitive PGA outputs; 3V operation matches LDO-regulated wearable rails. |
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 |
|---|---|---|---|
| LTC1864LIS8#PBF | 16-bit resolution, same 150ksps rate, identical SO-8 package and pinout, but higher 1.22mW power at full speed. | Required where ENOB >13 bits is mandatory (e.g., precision weigh scales); not drop-in due to increased code width and timing sensitivity. | Select LTC1864LIS8#PBF only if 16-bit resolution is essential and system can accommodate higher code-read latency and tighter layout noise control. |
| ADS7822U | 12-bit, 200ksps, 3V supply, SO-8, but uses 4-wire SPI (separate CS) and lacks auto-sleep - draws 1.2mA continuously. | Suitable for non-battery systems needing higher throughput; incompatible sleep behavior increases average power in intermittent acquisition. | Choose ADS7822U only when 200ksps is required and continuous power draw is acceptable; not recommended for energy-constrained designs. |
Compared with LTC1860LIS8#PBF, LTC1864LIS8#PBF trades lower power for higher resolution, while ADS7822U offers higher speed at significantly higher quiescent current - making LTC1860LIS8#PBF optimal for balanced 12-bit, ultra-low-power, space-limited applications.
Availability
LTC1860LIS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and isolated remote I/O requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for LTC1860LIS8#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 for demanding industrial and medical applications.
The LTC1860L series was engineered for ultra-low-power, high-speed data acquisition in space- and energy-constrained systems - emphasizing minimal supply current, flexible reference architecture, and robust serial interface simplicity.
FAQ
What is the operating temperature range for the LTC1860LIS8#PBF?
The LTC1860LIS8#PBF is specified for operation from –40°C to +85°C (industrial grade). This range is confirmed in the "Order Information" table and "Absolute Maximum Ratings" section of the official datasheet, and applies to all DC and AC performance parameters marked with the "G" symbol.
Does the LTC1860LIS8#PBF require an external reference voltage?
Yes - the LTC1860LIS8#PBF requires an external reference applied to the VREF pin (Pin 1). It does not include an internal reference. The device supports VREF from 1V to VCC (2.7–3.6V), enabling both ratiometric and precision-fixed-span configurations; reference current draw is ≤3µA.
Can the LTC1860LIS8#PBF interface directly with a microcontroller GPIO without level-shifting?
Yes - the LTC1860LIS8#PBF digital I/O (SCK, SDO, CONV) is fully 3V-compatible: VIH(min) = 1.9V at VCC = 3.3V and VIL(max) = 0.45V at VCC = 2.7V. When interfaced with 3V MCUs (e.g., STM32L, MSP430FR), no level-shifting is needed; drive strength supports standard CMOS loads.
How does the auto-shutdown feature of the LTC1860LIS8#PBF reduce system power?
The LTC1860LIS8#PBF automatically enters low-power sleep mode (ICC ≈ 10µA) when CONV remains high after conversion completion. This eliminates software-controlled power gating overhead. At 1ksps, average current drops from 450µA to ~10µA - extending battery life by >40× compared to continuous-operation ADCs.
Is the LTC1860LIS8#PBF pin-compatible with any higher-resolution alternatives?
Yes - the LTC1860LIS8#PBF is pin-compatible with the 16-bit LTC1864LIS8#PBF (same SO-8 footprint, identical pin functions and voltage ratings). However, the LTC1864LIS8#PBF outputs 16-bit words and has tighter layout requirements for reference and analog routing to maintain its higher accuracy.
LTC1860LIS8#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1860LIS8#PBF FAQ
1.How can I place an order for LTC1860LIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1860LIS8#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 LTC1860LIS8#PBF reliable?
The price and inventory of LTC1860LIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1860LIS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1860LIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1860LIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1860LIS8#PBF?
LTC1860LIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1860LIS8#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 LTC1860LIS8#PBF?
For technical support, including LTC1860LIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1860LIS8#PBF requirements.
6.How does Aetrix verify that LTC1860LIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1860LIS8#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 LTC1860LIS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1860LIS8#PBF?
All LTC1860LIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1860LIS8#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 LTC1860LIS8#PBF part is unused and in its original packaging.
Return procedure for LTC1860LIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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