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Analog Devices Inc. LTC1864LACS8#TRPBF
- Part No.:
- LTC1864LACS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864LACS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,717
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Product details
Overview
LTC1864LACS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps successive approximation ADC with true differential analog input, external reference pin, and SPI/MICROWIRE-compatible serial interface. It operates on a single 3V supply, draws only 450µA at full speed, and auto-shuts down between conversions to reduce current to 10µA at 1ksps. Designed for high-precision, low-power data acquisition in portable instrumentation and isolated sensor interfaces.
For engineers reviewing the LTC1864LACS8#TRPBF datasheet, LTC1864LACS8#TRPBF pinout, LTC1864LACS8#TRPBF application, or LTC1864LACS8#TRPBF equivalent, this page delivers verified specifications, MSOP-8 package layout, differential sampling behavior, ratiometric operation support, and real-world use context - all grounded in the official Linear Technology LTC1864L/LTC1865L datasheet (SN18645L).
Technical Context
The LTC1864LACS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting unipolar differential input ranges from 0V to VREF (1V–3.6V). Its conversion timing is fixed at 3.7–4.66µs, synchronized by a rising-edge-activated CONV signal and clocked via SCK up to 8MHz.
It features high-impedance analog inputs (±1µA leakage), 12pF input capacitance in sample mode, and rail-to-rail compatibility when IN– is grounded and VREF = VCC. The device uses a 3-wire serial interface (CONV, SCK, SDO) with no minimum data transfer rate requirement and supports zero-latency readout after conversion completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 38.1µV at 2.5V reference, enabling sub-40µV voltage resolution in precision sensor front-ends. |
| Sampling Rate | 150ksps maximum - supports real-time monitoring of signals up to 20kHz full-linear bandwidth (S/(N+D) ≥ 75dB). |
| Supply Current | 450µA typical at 150ksps; drops to 10µA at 1ksps - enables battery life extension in portable systems without sacrificing peak performance. |
| INL Error | ±8 LSB max over temperature - ensures monotonicity and <0.12% end-point linearity error across full scale, critical for closed-loop control feedback. |
| SNR / SINAD | 82dB SNR, 82dB SINAD at 1kHz - provides >13.3 effective number of bits (ENOB), suitable for high-fidelity industrial transducer digitization. |
| Input Range | Differential: 0V to VREF (1V–3.6V); absolute: IN+ = –0.05V to VCC+0.05V, IN– = –0.05V to VCC/2 - allows direct connection to low-output sensors without gain stages. |
| Reference Input | External VREF pin (1V–VCC) - enables ratiometric measurement against sensor excitation or stable external references like LT1460. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, lead coplanarity ≤0.102mm. RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Defines full-scale span; must be low-noise and bypassed with ≥1µF tantalum to AGND; supports 1V–3.6V range for ratiometric or precision applications. |
| IN+ (Pin 2) | Differential analog input (+) | High-impedance (±1µA leakage), sampled simultaneously with IN–; accepts up to VCC+0.05V; common-mode rejection enabled by matched sampling. |
| IN– (Pin 3) | Differential analog input (–) | Accepts up to VCC/2; when grounded with VREF = VCC, enables rail-to-rail unipolar input on IN+ (0V–VCC). |
| GND (Pin 4) | Analog ground reference | Must connect directly to analog ground plane with minimal trace length; serves as return for VREF, IN+, IN–, and internal bias circuitry. |
| CONV (Pin 5) | Convert start/control input | Rising edge initiates conversion; held high after completion forces auto-shutdown; falling edge enables SDO output for serial readout. |
| SDO (Pin 6) | Serial data output | 3-wire SPI/MICROWIRE-compatible; outputs 16-bit result MSB-first on SCK falling edge; tri-stated when CONV is high. |
| SCK (Pin 7) | Serial clock input | Synchronizes data transfer; supports DC–8MHz; no minimum frequency required; data captured on rising edge by host. |
| VCC (Pin 8) | Positive supply | 2.7V–3.6V operation; requires local 1µF tantalum bypass to GND; noise on VCC directly impacts conversion accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces supply current from 450µA (150ksps) to 10µA (1ksps), enabling dynamic power scaling in duty-cycled sensor nodes. |
| True differential input architecture | Rejects common-mode noise on IN+/IN– pair, allowing direct interfacing with bridge sensors or transformer-coupled signals without instrumentation amps. |
| No minimum data transfer rate | Permits flexible host timing - SCK can pause mid-transfer or run at any speed ≤8MHz, simplifying firmware integration with slow microcontrollers. |
| 16-bit upgrade path from 12-bit LTC1860L/LTC1861L | Pin-compatible footprint and identical serial protocol enable drop-in resolution upgrade without PCB redesign or driver changes. |
| High input impedance & low leakage | ±1µA max analog input leakage and 12pF input capacitance minimize loading on high-Z sources (e.g., piezoresistive sensors, thermocouples with cold-junction compensation). |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter or battery-powered environmental monitor measuring temperature, pressure, or strain via low-output sensors. IC Role / Device Role / Timing Role: Primary 16-bit digitizer capturing differential sensor outputs at ≤150ksps with autonomous power management. Use Value: 450µA active current and 10µA sleep current extend AA/AAA battery life to >1 year in periodic-readout mode while maintaining 16-bit resolution. |
Use Scenario: Industrial PLC analog input module acquiring signals across galvanic isolation barriers (e.g., optocoupler or digital isolator interfaces). IC Role / Device Role / Timing Role: Isolated-side ADC converting sensor voltages into serial data for transmission across barrier with minimal latency (≤4.66µs conversion + 16-cycle readout). Use Value: Differential input rejects common-mode noise induced by ground loops or EMI in noisy factory environments, improving measurement stability. |
| Low-Power Sensor Interface | Ratiometric Transducer Digitization |
|
Use Scenario: Wireless node with MEMS accelerometer or humidity sensor requiring ultra-low quiescent power during standby. IC Role / Device Role / Timing Role: Always-on sensing front-end that wakes on interrupt, samples once, and returns to 10µA sleep - no external wake-up controller needed. Use Value: Auto-shutdown eliminates need for external power-gating circuitry, reducing BOM count and board area in space-constrained IoT endpoints. |
Use Scenario: Load cell or RTD measurement where excitation voltage and ADC reference share the same source (e.g., DAC output or regulated rail). IC Role / Device Role / Timing Role: Ratiometric A/D converter using shared VREF/VEXC to cancel drift and tolerance errors in bridge-based transducers. Use Value: Eliminates need for precision voltage reference ICs; system accuracy depends only on matching of VREF and excitation source, not absolute reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit, low-power, serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1864LCS8#TRPBF | Same silicon, commercial temperature grade (0°C to 70°C) vs. LTC1864LACS8#TRPBF's extended grade (–40°C to 85°C). | Not rated for automotive or industrial ambient extremes; unsuitable for outdoor or under-hood deployments. | Select LTC1864LACS8#TRPBF when operation beyond 70°C is required; otherwise LTC1864LCS8#TRPBF offers cost advantage. |
| ADS8325IDGSR | TI 16-bit SAR ADC; 100ksps max, 2.7V–5.5V supply, SPI interface; higher 1.5mW power at full speed vs. 1.22mW for LTC1864LACS8#TRPBF. | Lacks auto-shutdown - fixed 1.5mW draw regardless of sampling rate; less suited for burst-mode battery operation. | Choose ADS8325IDGSR only if 5V system compatibility or TI ecosystem alignment outweighs power and temperature advantages of LTC1864LACS8#TRPBF. |
Compared with LTC1864LCS8#TRPBF, the LTC1864LACS8#TRPBF adds guaranteed operation down to –40°C and improves long-term reliability in thermal cycling environments; versus ADS8325IDGSR, it delivers 63% lower active power and built-in adaptive power management - critical for energy-constrained edge nodes.
Availability
LTC1864LACS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and low-power sensor interface applications requiring stable component supply, long-lifecycle support, and guaranteed extended-temperature performance.
Supply support for LTC1864LACS8#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, Inc. (including legacy Linear Technology products) designs high-performance analog, mixed-signal, and power management ICs for precision measurement, signal conditioning, and energy-efficient systems.
The LTC1864L series belongs to Linear Technology's precision data acquisition portfolio, engineered specifically for compact, battery-operated, and noise-sensitive applications demanding 16-bit resolution with µPower consumption and robust serial interfacing.
FAQ
What is the operating temperature range of the LTC1864LACS8#TRPBF?
The LTC1864LACS8#TRPBF is specified for operation from –40°C to +85°C (extended temperature grade), making it suitable for industrial, automotive, and outdoor embedded applications where ambient conditions exceed commercial-grade limits. This range is confirmed in the Absolute Maximum Ratings table of the official datasheet (SN18645L, Page 2).
Does the LTC1864LACS8#TRPBF require an external reference voltage?
Yes - the LTC1864LACS8#TRPBF requires an external reference voltage applied to the VREF pin (Pin 1), which defines its full-scale input range. It supports VREF from 1V to VCC (2.7V–3.6V), enabling ratiometric operation with sensor excitation sources or precision references like the LT1460. Internal reference is not provided.
How does the auto-shutdown feature work in the LTC1864LACS8#TRPBF?
In the LTC1864LACS8#TRPBF, auto-shutdown activates automatically when the CONV pin remains high after conversion completes. This reduces supply current from 450µA (at 150ksps) to just 10µA at 1ksps. The feature eliminates need for external power-control logic and is intrinsic to the SAR core design per the Functional Block Diagram (Page 8, SN18645L).
Is the LTC1864LACS8#TRPBF pin-compatible with older 12-bit ADCs?
Yes - the LTC1864LACS8#TRPBF is pin-compatible with the 12-bit LTC1860L and LTC1861L families in the MSOP-8 package. Identical pinout (VREF, IN+, IN–, GND, CONV, SDO, SCK, VCC) and SPI/MICROWIRE protocol allow direct replacement to upgrade resolution without PCB or firmware changes.
What is the maximum clock frequency supported on the SCK pin of the LTC1864LACS8#TRPBF?
The SCK pin of the LTC1864LACS8#TRPBF supports up to 8MHz clock frequency, as specified in the Recommended Operating Conditions table (Page 4, SN18645L). This enables full 16-bit readout in ≤2µs, ensuring minimal latency in time-critical acquisition systems.
LTC1864LACS8#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1864LACS8#TRPBF FAQ
1.How can I place an order for LTC1864LACS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864LACS8#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 LTC1864LACS8#TRPBF reliable?
The price and inventory of LTC1864LACS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864LACS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1864LACS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864LACS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864LACS8#TRPBF?
LTC1864LACS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864LACS8#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 LTC1864LACS8#TRPBF?
For technical support, including LTC1864LACS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864LACS8#TRPBF requirements.
6.How does Aetrix verify that LTC1864LACS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1864LACS8#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 LTC1864LACS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1864LACS8#TRPBF?
All LTC1864LACS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864LACS8#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 LTC1864LACS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1864LACS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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