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Analog Devices Inc. LTC1864LAIS8#PBF
- Part No.:
- LTC1864LAIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864LAIS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LTC1864LAIS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps successive approximation ADC with true differential analog input, single 3V supply operation, and auto-shutdown power management. It features 450µA typical supply current at full speed, 82dB SNR, ±8 LSB INL, and MSOP-8 package - ideal for precision, low-power data acquisition in portable instrumentation and isolated sensor interfaces.
For engineers reviewing the LTC1864LAIS8#PBF datasheet, LTC1864LAIS8#PBF pinout, LTC1864LAIS8#PBF application, or LTC1864LAIS8#PBF equivalent, this page delivers verified technical context, pin-level design meaning, real-world use cases, and validated alternative options for embedded signal conditioning systems requiring rail-to-rail input support and SPI/MICROWIRE™ compatibility.
Technical Context
The LTC1864LAIS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, operating across –40°C to +85°C. Its differential input accepts 0V to VREF spans (1V–3.6V), enabling direct connection to transducers without external gain stages. The converter uses a 3-wire serial interface (CONV, SCK, SDO) with no minimum data transfer rate requirement.
Auto-shutdown reduces supply current to 10µA at 1ksps, and conversion time is fixed at 3.7–4.66µs. Reference input is externally supplied and decoupled; analog inputs exhibit 12pF capacitance in sample mode and ±1µA leakage over temperature - critical for low-source-impedance front-end design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1:65,536 voltage resolution for high-fidelity sensor digitization |
| Sampling Rate | 150ksps maximum - supports anti-aliasing filter cutoffs up to ~20kHz linear bandwidth |
| Supply Current | 450µA typ at 150ksps; drops to 10µA at 1ksps - enables battery life extension in intermittent-sampling systems |
| INL Error | ±8 LSB max - ensures monotonicity and <0.12% full-scale linearity error across temperature |
| SNR | 82dB - supports >13.3 effective bits (ENOB) for precision measurement applications |
| Input Range | Differential 0V to VREF (1V–3.6V) - allows ratiometric sensing or external reference flexibility |
| Interface | SPI/MICROWIRE™ compatible 3-wire serial (CONV/SCK/SDO) - simplifies MCU integration with minimal GPIO use |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, RoHS-compliant, lead-free (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; must be low-noise and bypassed with ≥1µF to AGND; supports 1V–3.6V range |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance sampling node; paired with IN– for common-mode noise rejection |
| IN– (Pin 3) | Differential Analog Input (–) | Accepts 0V to VCC/2 range; enables true differential or pseudo-differential configurations |
| GND (Pin 4) | Analog Ground | Single-point AGND tie point; must connect directly to analog ground plane with minimal trace length |
| CONV (Pin 5) | Convert Control Input | Rising edge initiates conversion; held high after completion to enter auto-shutdown mode |
| SDO (Pin 6) | Serial Data Output | Shifts out 16-bit result on falling SCK edge; tri-stated when CONV is high |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; supports DC to 8MHz clock; no minimum frequency required |
| VCC (Pin 8) | Positive Supply | 2.7V–3.6V single supply; requires local 1µF tantalum bypass to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Input Architecture | Rejects common-mode noise up to full bandwidth; enables direct connection to bridge sensors and isolated amplifiers |
| Auto-Shutdown Power Management | Reduces ICC from 450µA to 10µA between conversions - eliminates need for external sleep control logic |
| No Minimum Data Transfer Rate | Allows indefinite idle periods on SCK line - simplifies timing-critical MCU firmware and low-power polling schemes |
| 16-Bit Pin Compatibility | Direct replacement for 12-bit LTC1860L/LTC1861L in same MSOP-8 footprint - enables resolution upgrade without PCB change |
| Rail-to-Rail Input Support | Operates with reduced spans down to 1V full scale - accommodates low-voltage transducers and energy-harvesting sources |
Applications
| Portable Instrumentation | Isolated Sensor Interface |
|---|---|
|
Use Scenario: Handheld multimeter or environmental logger acquiring thermocouple or RTD signals with battery life >1 year. IC Role / Device Role / Timing Role: Primary 16-bit digitizer; performs synchronized sampling triggered by microcontroller's CONV pulse. Use Value: 450µA active current and 10µA shutdown current extend coin-cell life; differential input rejects EMI in unshielded enclosures. |
Use Scenario: Industrial current/voltage monitor using opto-isolated front-end feeding into isolated ADC domain. IC Role / Device Role / Timing Role: Isolated-side A/D converter; receives clean analog signals referenced to local AGND, outputs digital data across isolation barrier. Use Value: High-impedance inputs minimize loading on isolated op-amp outputs; 82dB SNR preserves dynamic range across 100dB system range. |
| Low-Power Data Acquisition | Compact Signal Conditioning |
|
Use Scenario: Wireless sensor node sampling strain gauges every 10 seconds, transmitting via BLE only on threshold breach. IC Role / Device Role / Timing Role: Event-driven digitizer; wakes on timer interrupt, samples once, shuts down, and signals host MCU via GPIO. Use Value: Auto-shutdown eliminates software-controlled power gating; 3.7µs conversion enables sub-millisecond total active time per sample. |
Use Scenario: Tiny 2-chip DAQ combining LTC6910-1 programmable-gain amplifier with LTC1864LAIS8#PBF in space-constrained medical sensor module. IC Role / Device Role / Timing Role: Final-stage ADC in signal chain; accepts amplified, filtered, and level-shifted analog output from PGA. Use Value: 1V–3.6V VREF flexibility matches PGA output swing; MSOP-8 footprint co-locates with TSOT-23 PGA for minimal trace length and noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI interface, 1.8V–3.6V supply, 1.5mW @ 100ksps; no auto-shutdown | Higher speed but higher power; requires external power sequencing for low-duty-cycle use | Select when sampling rate >150ksps is needed and system can manage continuous power budget |
| LTC2311CDHC-14#PBF | 14-bit, 250ksps, pseudo-differential input, 2.5V–5.5V supply, 3.5mW @ 250ksps | Lower resolution but faster; lacks true differential input and auto-shutdown; SO-8 package | Select when cost-sensitive 14-bit performance suffices and board layout already accommodates SO-8 footprint |
Compared with ADS8860IDRCT and LTC2311CDHC-14#PBF, the LTC1864LAIS8#PBF uniquely balances ultra-low quiescent current, true differential input, and MSOP-8 size - making it optimal for battery-powered, noise-sensitive, space-constrained designs where 150ksps and 16-bit fidelity are sufficient.
Availability
LTC1864LAIS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated sensor interfaces, and low-power data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC1864LAIS8#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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC1864L family.
The LTC1864L series was designed for compact, low-power, high-accuracy data acquisition in battery-operated and space-constrained systems - emphasizing minimal external components, flexible reference options, and seamless MCU integration.
FAQ
What is the operating temperature range of the LTC1864LAIS8#PBF?
The LTC1864LAIS8#PBF is rated for industrial operation from –40°C to +85°C. This is confirmed by the "I" grade suffix in the part number and specified in the Absolute Maximum Ratings table. All key AC/DC parameters - including INL, SNR, and supply current - are guaranteed across this full range, enabling deployment in harsh environments like factory automation and outdoor monitoring equipment.
Does the LTC1864LAIS8#PBF require an external reference voltage?
Yes, the LTC1864LAIS8#PBF requires an external reference voltage applied to the VREF pin (Pin 1). It supports reference voltages from 1V to VCC (up to 3.6V), allowing ratiometric measurements or precision external references like the LT1460. Unlike some ADCs, it does not include an internal reference - VREF must be externally sourced and properly bypassed with ≥1µF to GND.
Can the LTC1864LAIS8#PBF interface directly with a 3.3V microcontroller?
Yes, the LTC1864LAIS8#PBF is fully compatible with 3.3V microcontrollers. Its digital I/O (CONV, SCK, SDO) operates at VCC = 2.7–3.6V, with VIH = 1.9V min and VOL = 0.3V max at IO = 400µA - ensuring robust logic-level interoperability. No level-shifting is required when both devices share the same 3.3V supply domain.
How does the auto-shutdown feature work on the LTC1864LAIS8#PBF?
The LTC1864LAIS8#PBF automatically enters low-power shutdown mode when the CONV pin remains high after conversion completes. This reduces supply current from 450µA to just 10µA at 1ksps. To resume sampling, the host MCU asserts a new rising edge on CONV - eliminating the need for separate enable/disable control lines or firmware-managed power states.
Is the LTC1864LAIS8#PBF pin-compatible with earlier 12-bit versions?
Yes, the LTC1864LAIS8#PBF is pin-compatible with the 12-bit LTC1860L and LTC1861L in the same MSOP-8 package. This allows direct drop-in resolution upgrades without PCB redesign. Key signals (VREF, IN+, IN–, GND, CONV, SDO, SCK, VCC) occupy identical positions, and electrical tolerances (e.g., input voltage ranges, logic thresholds) are maintained for backward compatibility.
LTC1864LAIS8#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:
- 16
- Sampling Rate (Per Second):
- 150k
- Number of Inputs:
- 1
- Input Type:
- Differential
- 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:
- -
LTC1864LAIS8#PBF FAQ
1.How can I place an order for LTC1864LAIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864LAIS8#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 LTC1864LAIS8#PBF reliable?
The price and inventory of LTC1864LAIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864LAIS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1864LAIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864LAIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864LAIS8#PBF?
LTC1864LAIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864LAIS8#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 LTC1864LAIS8#PBF?
For technical support, including LTC1864LAIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864LAIS8#PBF requirements.
6.How does Aetrix verify that LTC1864LAIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1864LAIS8#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 LTC1864LAIS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1864LAIS8#PBF?
All LTC1864LAIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864LAIS8#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 LTC1864LAIS8#PBF part is unused and in its original packaging.
Return procedure for LTC1864LAIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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