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Analog Devices Inc. LTC1865LCS8#PBF
- Part No.:
- LTC1865LCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865LCS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:143
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Product details
Overview
LTC1865LCS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps, 2-channel software-selectable multiplexed successive approximation ADC operating on a single 3V supply in an 8-lead SOIC package. It features true differential or single-ended input modes, external reference support (VREF = 1V to VCC), and auto-shutdown reducing supply current to 10µA at 1ksps. It serves precision data acquisition in portable instrumentation and isolated sensor interfaces.
For engineers reviewing the LTC1865LCS8#PBF datasheet, LTC1865LCS8#PBF pinout, LTC1865LCS8#PBF application, or LTC1865LCS8#PBF equivalent, key selection criteria include its 16-bit resolution with ±6 LSB INL, SPI/MICROWIRE-compatible serial interface, MSOP/SO-8 package compatibility, and ratiometric operation capability with high-impedance analog inputs enabling direct connection to low-output-impedance sensors without gain stages.
Technical Context
The LTC1865LCS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both differential and single-ended input configurations via a 2-bit MUX control word shifted in on SDI. Its conversion timing is fixed at 3.7–4.66 µs, synchronized by CONV rising edge and clocked by SCK up to 8 MHz.
It operates exclusively in SO-8 package configuration where VREF is internally tied to VCC, fixing full-scale span to VCC (2.7V–3.6V). Digital I/O complies with 2.7V logic thresholds (VIH = 1.9V, VIL = 0.45V), and analog inputs tolerate –0.05V to VCC + 0.05V with leakage ≤ ±1 µA over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-precision voltage measurement |
| Max Sampling Rate | 150 ksps - supports real-time monitoring of signals up to ~20 kHz full-linear bandwidth |
| Supply Current | 450 µA typical at 150 ksps; drops to 10 µA at 1 ksps via auto-shutdown - enables battery-powered operation |
| INL Error | ±6 LSB max - ensures monotonicity and accurate end-point linearity across full scale |
| SNR | 82 dB - supports >13.3 effective number of bits (ENOB) for clean signal digitization |
| Input Voltage Range | 0 V to VCC (ratiometric) - allows direct interfacing with sensors referenced to same supply |
| Reference Input | VREF tied internally to VCC in SO-8 package - eliminates external reference component in basic configurations |
Pinout & Package
Package: 8-lead plastic SOIC (narrow, 0.150-inch width), JEDEC MS-012AC compliant, body size 4.90 mm × 3.90 mm, lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Internally connected to VCC in SO-8 version - defines full-scale range as VCC; no external reference required |
| CH0 (Pin 2) | Analog Input Channel 0 | Positive input for channel 0 in differential mode or single-ended input when selected via MUX control |
| CH1 (Pin 3) | Analog Input Channel 1 | Positive input for channel 1 in differential mode or second single-ended input; referenced to GND in SO-8 |
| GND (Pin 4) | Analog Ground | Common return for analog circuitry; must be tied directly to low-noise analog ground plane |
| CONV (Pin 5) | Convert Control Input | Rising edge initiates conversion; falling edge enables SDO output and accepts MUX configuration on SDI |
| SDO (Pin 6) | Digital Data Output | Serial 16-bit result shifted out MSB-first on falling SCK edge; tri-stated when CONV high |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; supports up to 8 MHz clock rate for fast readout |
| VCC (Pin 8) | Positive Supply | Single 2.7V–3.6V supply; requires local 1 µF tantalum bypass to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 2-Channel Software-Selectable MUX | Enables flexible signal routing between CH0/CH1 in differential or single-ended mode using 2-bit SDI command |
| Auto Shutdown Between Conversions | Reduces average supply current from 450 µA to 10 µA at 1 ksps - extends battery life in intermittent-sampling systems |
| High-Z Analog Inputs with Low Leakage | ±1 µA max input leakage supports direct connection to high-impedance sources (e.g., thermocouples, RTDs) without buffer amplifiers |
| SPI/MICROWIRE-Compatible Interface | Full-duplex serial protocol with no minimum data rate requirement - simplifies integration with microcontrollers and FPGAs |
| Ratiometric Operation Support | Full-scale span tracks VCC, eliminating errors from supply drift when sensor excitation shares same rail |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter or environmental sensor node measuring temperature, pressure, and humidity with battery power budget under 1 mA. IC Role / Device Role / Timing Role: Primary ADC capturing dual analog sensor outputs with 16-bit resolution and automatic power gating between readings. Use Value: 450 µA active current and 10 µA sleep current enable >1-year battery life at 1-sample-per-second duty cycle. | Use Scenario: Industrial field transmitter sending sensor data across galvanic isolation barrier to PLC or DCS. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing conditioned analog inputs before serial transmission through digital isolator. Use Value: Ratiometric operation ensures accuracy remains stable despite minor VCC variations induced by isolated DC-DC converter ripple. |
| Compact Sensor Interface | Low-Power Remote Monitoring |
Use Scenario: Space-constrained IoT node with two analog sensors (e.g., strain gauge + thermistor) sharing one ADC. IC Role / Device Role / Timing Role: Dual-channel MUX-based ADC eliminating need for two separate converters or external analog switches. Use Value: Software-selectable input configuration reduces BOM count and PCB area versus discrete channel solutions. | Use Scenario: Wireless soil moisture sensor deployed in agricultural fields, transmitting data every 10 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Low-power ADC activated only during sampling window, then fully powered down until next wake-up event. Use Value: Auto-shutdown feature minimizes quiescent current contribution, preserving energy for RF transmission phase. |
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 |
|---|---|---|---|
| LTC1865LIMS8#PBF | Same core architecture and pinout, but rated for –40°C to 85°C industrial temperature range vs. 0°C to 70°C for LTC1865LCS8#PBF | Required for outdoor or automotive-adjacent deployments where ambient exceeds 70°C | Select when extended temperature operation is mandatory; otherwise LTC1865LCS8#PBF offers cost advantage for commercial-grade systems |
| ADS8325IDR | 16-bit, 100 ksps, SPI interface, 2.7–5.5V supply, but no internal VREF-to-VCC tie - requires external reference or VREF = VCC connection | Offers lower power (350 µA at 100 ksps) but lacks integrated MUX and has slower sampling rate | Prefer for ultra-low-power, single-channel applications where 50 ksps margin is acceptable and external reference is already present |
Compared with LTC1865LIMS8#PBF, the LTC1865LCS8#PBF trades extended temperature range for lower cost in commercial environments; versus ADS8325IDR, it provides higher speed and integrated dual-channel flexibility at slightly higher active current, making it better suited for compact, multi-sensor, battery-operated systems requiring 150 ksps throughput.
Availability
LTC1865LCS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and compact sensor interface designs requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LTC1865LCS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1865LCS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for low-power, high-resolution, space-constrained measurement systems operating from single 3V supplies.
FAQ
What is the maximum sampling frequency supported by the LTC1865LCS8#PBF?
The LTC1865LCS8#PBF supports a maximum sampling frequency of 150 ksps, corresponding to a minimum conversion time of 3.7 µs. This is guaranteed across the full operating temperature range (0°C to 70°C) and supply voltage range (2.7V to 3.6V). The device maintains 16-bit resolution and specified INL/SNR performance at this rate, making it suitable for anti-aliasing-critical applications up to ~20 kHz full-linear bandwidth.
Does the LTC1865LCS8#PBF require an external voltage reference?
No - the LTC1865LCS8#PBF in SO-8 package (LTC1865LCS8#PBF) has VREF internally tied to VCC, enabling ratiometric operation without an external reference. This simplifies design and reduces BOM count when sensor excitation and ADC share the same supply. For non-ratiometric use cases requiring precise absolute measurement, an external reference can be applied only if using the MSOP variant (e.g., LTC1865LCMS#PBF), not the SO-8 LTC1865LCS8#PBF.
How does the multiplexer in the LTC1865LCS8#PBF operate?
The LTC1865LCS8#PBF uses a 2-bit MUX control word shifted into SDI after CONV falls low. The word selects among four configurations: single-ended CH0 or CH1 referenced to GND, or differential CH0–CH1 or CH1–CH0. Unlike hardware-muxed ADCs, this software-selectable MUX allows dynamic channel switching per conversion cycle without external components, enabling flexible scan sequences in firmware-controlled data acquisition.
What is the supply current of the LTC1865LCS8#PBF at 1 ksps?
At 1 ksps, the LTC1865LCS8#PBF draws only 10 µA typical supply current due to its auto-shutdown feature, which powers down analog circuitry between conversions. This value is specified over the full 0°C to 70°C temperature range and is critical for battery-powered applications where average current determines operational lifetime. At 150 ksps, current rises to 450 µA typical, scaling approximately linearly with sampling rate.
Is the LTC1865LCS8#PBF pin-compatible with earlier 12-bit versions?
Yes - the LTC1865LCS8#PBF is pin-compatible with the 12-bit LTC1860LCS8 and LTC1861LCS8 in the same SO-8 package, sharing identical pin functions and layout. This allows drop-in resolution upgrades in existing designs without PCB revision. However, users must verify timing margins (e.g., tCONV = 4.66 µs max for LTC1865LCS8#PBF vs. shorter for 12-bit variants) and update firmware to handle 16-bit data words instead of 12-bit.
LTC1865LCS8#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:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- -
LTC1865LCS8#PBF FAQ
1.How can I place an order for LTC1865LCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865LCS8#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 LTC1865LCS8#PBF reliable?
The price and inventory of LTC1865LCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865LCS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865LCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865LCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865LCS8#PBF?
LTC1865LCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865LCS8#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 LTC1865LCS8#PBF?
For technical support, including LTC1865LCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865LCS8#PBF requirements.
6.How does Aetrix verify that LTC1865LCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865LCS8#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 LTC1865LCS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865LCS8#PBF?
All LTC1865LCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865LCS8#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 LTC1865LCS8#PBF part is unused and in its original packaging.
Return procedure for LTC1865LCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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