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Analog Devices Inc. LTC1864LAIS8#TRPBF
- Part No.:
- LTC1864LAIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864LAIS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,122
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Product details
Overview
LTC1864LAIS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps single-channel differential successive approximation ADC operating on a single 3V supply in an 8-lead MSOP package. It features true differential analog inputs (IN+, IN–), external reference pin (VREF), auto-shutdown reducing supply current to 10µA at 1ksps, and SPI/MICROWIRE-compatible 3-wire serial interface. It is used in precision low-power data acquisition systems requiring rail-to-rail input capability with external reference flexibility.
For engineers reviewing the LTC1864LAIS8#TRPBF datasheet, LTC1864LAIS8#TRPBF pinout, LTC1864LAIS8#TRPBF application, or LTC1864LAIS8#TRPBF equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply assurance - all grounded in the official Linear Technology LTC1864L/LTC1865L datasheet (SN18645L) and package drawings.
Technical Context
The LTC1864LAIS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold. Its differential input stage rejects common-mode noise, and its external VREF pin enables ratiometric operation or fixed-span configurations down to 1V full-scale. The device operates across –40°C to 85°C (industrial grade), with absolute input range of –0.05V to VCC + 0.05V on IN+ and –0.05V to VCC/2 on IN–.
Conversion is initiated by a rising edge on CONV; completion occurs in 3.7–4.66µs. Data is clocked out via SDO on falling SCK edges, synchronized to a maximum 8MHz serial clock. The part enters auto-shutdown between conversions, achieving 450µA typical supply current at 150ksps and dropping to 0.5–10µA in sleep mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = VREF/65536 quantization step for high-precision measurement |
| Max Sampling Rate | 150ksps - supports real-time acquisition of signals up to ~20kHz full-linear bandwidth |
| Supply Voltage | 2.7V to 3.6V - compatible with standard 3V logic rails and battery-powered systems |
| INL Error | ±8 LSB max - ensures monotonicity and <0.12% end-point linearity error over temperature |
| SNR | 82dB - enables >13.3 effective number of bits (ENOB) for clean signal digitization |
| Supply Current @ 150ksps | 450µA typ - achieves 3.02 µW per sample, ideal for energy-constrained instrumentation |
| Reference Input Range | 1V to VCC - allows flexible scaling from low-voltage sensors to rail-referenced sources |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, exposed pad optional. RoHS-compliant, tape-and-reel (TRPBF).
| 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 |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance sampling node; accepts 0V to VREF differential voltage |
| IN– (Pin 3) | Differential Analog Input (–) | Paired with IN+; common-mode rejection improves noise immunity |
| GND (Pin 4) | Analog Ground | Primary return path for analog circuitry; requires direct connection to analog ground plane |
| CONV (Pin 5) | Convert Control Input | Rising edge starts conversion; held high after conversion enables auto-shutdown |
| SDO (Pin 6) | Serial Data Output | 3-wire SPI/MICROWIRE output; data valid on falling SCK edge, captured on rising edge |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; supports up to 8MHz clock frequency |
| VCC (Pin 8) | Positive Supply | Single 2.7–3.6V supply; requires local 1µF tantalum bypass to GND |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Inputs | Enables common-mode noise rejection and eliminates need for external instrumentation amplifiers in noisy environments |
| Auto Shutdown Mode | Reduces ICC from 450µA to 10µA at 1ksps - extends battery life in portable instrumentation without software intervention |
| External Reference Flexibility | Supports VREF from 1V to VCC - accommodates both precision references (e.g., LT1460) and ratiometric sensor bridges |
| No Minimum Data Transfer Rate | Allows indefinite idle periods between conversions - simplifies timing design in event-triggered acquisition systems |
| 16-Bit Pin Compatibility | Direct replacement for 12-bit LTC1860L/LTC1861L - enables resolution upgrade without PCB redesign |
Applications
| Industrial Sensor Interface | Portable Medical Instrumentation |
|---|---|
Use Scenario: Digitizing outputs from strain-gauge load cells or RTD-based temperature transmitters with millivolt-level differential signals. IC Role / Device Role / Timing Role: Precision 16-bit ADC capturing differential bridge outputs with external 2.5V reference and auto-shutdown between readings. Use Value: Achieves <0.01% measurement accuracy with no external gain stage required due to high-Z inputs and 1V–VCC reference support. | Use Scenario: Battery-powered ECG front-end acquiring low-amplitude biopotential signals in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-power 150ksps ADC sampling conditioned analog leads while minimizing system power budget. Use Value: 450µA active current and 10µA sleep current enable >100-hour operation on coin-cell batteries during intermittent monitoring. |
| Isolated Data Acquisition | Compact Test & Measurement |
Use Scenario: Signal conditioning in isolated industrial I/O modules where analog inputs are galvanically separated from digital host. IC Role / Device Role / Timing Role: Isolated-side ADC interfacing with optocoupled or digital isolator-based SPI links to MCU. Use Value: 3-wire serial interface minimizes isolation channel count; differential inputs reduce susceptibility to ground-loop noise across isolation barrier. | Use Scenario: Embedded data logger in handheld multimeter or calibration tool measuring DC voltage, current, and resistance. IC Role / Device Role / Timing Role: Primary 16-bit converter handling multiple input ranges via external gain stages and programmable reference. Use Value: 16-bit resolution and ±8 LSB INL ensure traceable metrology-grade accuracy compliant with Class II handheld instrument standards. |
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 |
|---|---|---|---|
| ADS8325IDGSR | 16-bit, 100ksps, SPI interface, internal reference option, 2.7–5.5V supply | Lower speed and fixed internal reference limit flexibility in ratiometric or low-voltage sensor interfaces | Select when internal reference suffices and 100ksps meets timing needs; verify layout compatibility with DGSR 10-pin MSOP |
| LTC2311CDHC-16#TRPBF | 16-bit, 500ksps, no auto-shutdown, 2.5–5.5V supply, higher ICC (2.5mA @ 500ksps) | Higher power and speed suit continuous streaming; lacks low-power sleep mode for duty-cycled systems | Select for high-throughput applications where 450µA active current is insufficient; confirm thermal management for 500ksps sustained operation |
Compared with ADS8325IDGSR and LTC2311CDHC-16#TRPBF, the LTC1864LAIS8#TRPBF uniquely balances 150ksps throughput, ultra-low 450µA active current, and external reference flexibility - making it optimal for battery-powered, precision, event-driven acquisition where power efficiency and analog interface control are critical.
Availability
LTC1864LAIS8#TRPBF is available at Aetrix Electronics and suitable for industrial sensor interface, portable medical instrumentation, isolated data acquisition, and compact test & measurement applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC1864LAIS8#TRPBF 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 ultra-low-power, high-resolution data acquisition in space-constrained, battery-operated, and industrial environments - emphasizing precision, minimal external components, and seamless integration with microcontrollers via simple 3-wire serial interfaces.
FAQ
What is the operating temperature range of the LTC1864LAIS8#TRPBF?
The LTC1864LAIS8#TRPBF is rated for industrial operation from –40°C to +85°C. This is confirmed by the "LAI" suffix in the part number (LTC1864LAIxx), which explicitly denotes the –40°C to 85°C grade per Linear Technology's ordering guide. Absolute maximum ratings include storage from –65°C to 150°C and lead temperature tolerance of 300°C for 10 seconds during soldering.
Does the LTC1864LAIS8#TRPBF require an external reference, or can it operate with VCC as reference?
The LTC1864LAIS8#TRPBF requires an external reference applied to the VREF pin; it does not have an internal reference. However, the reference voltage may be set equal to VCC (within 1V to VCC range), enabling rail-to-rail input spans when IN– is grounded. This configuration is explicitly supported and shown in Figure 3 of the datasheet, confirming VCC-referenced operation is valid and commonly used.
How does the auto-shutdown feature work on the LTC1864LAIS8#TRPBF?
The LTC1864LAIS8#TRPBF automatically powers down between conversions when the CONV pin remains high after conversion completes. At 1ksps, this reduces supply current from 450µA to 10µA. The shutdown state is entered without software command - it is hardware-controlled and deterministic. Waking requires only a new rising edge on CONV, with full conversion ready in ≤4.66µs, making it ideal for burst-mode sensing.
Can the LTC1864LAIS8#TRPBF interface directly with a 3.3V microcontroller SPI port?
Yes, the LTC1864LAIS8#TRPBF is fully compatible with 3.3V microcontrollers. Its digital inputs (CONV, SCK) accept VIH ≥ 1.9V and VIL ≤ 0.45V at VCC = 2.7V, well within 3.3V logic thresholds. Its SDO output drives VOH ≥ 2.3V and VOL ≤ 0.3V at IO = 400µA, meeting 3.3V CMOS level requirements. No level-shifting is needed for direct connection.
What is the maximum allowed analog input voltage range for the LTC1864LAIS8#TRPBF?
The absolute analog input voltage range for the LTC1864LAIS8#TRPBF is specified as –0.05V to VCC + 0.05V on the IN+ pin, and –0.05V to VCC/2 on the IN– pin. For a 3.3V supply, this means IN+ may swing from –0.05V to 3.35V, and IN– from –0.05V to 1.65V. Differential input voltage (IN+ – IN–) must remain within 0V to VREF, with VREF itself ranging from 1V to VCC.
LTC1864LAIS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1864LAIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864LAIS8#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1864LAIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864LAIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1864LAIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864LAIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864LAIS8#TRPBF?
LTC1864LAIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864LAIS8#TRPBF 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#TRPBF?
For technical support, including LTC1864LAIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864LAIS8#TRPBF requirements.
6.How does Aetrix verify that LTC1864LAIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1864LAIS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1864LAIS8#TRPBF?
All LTC1864LAIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864LAIS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1864LAIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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