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Analog Devices Inc. LTC1865IS8#PBF
- Part No.:
- LTC1865IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865IS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:518
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Product details
Overview
LTC1865IS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 2-channel, 250ksps successive approximation ADC in an 8-lead SOIC package operating on a single 5V supply. It features software-selectable MUX, adjustable reference input, true differential analog inputs, SPI/MICROWIRE-compatible serial interface, and auto-shutdown reducing supply current to 2μA at 1ksps. It is designed for low-power, high-precision data acquisition in battery-operated instrumentation.
For engineers reviewing the LTC1865IS8#PBF datasheet, LTC1865IS8#PBF pinout, LTC1865IS8#PBF application, or LTC1865IS8#PBF equivalent, key selection criteria include its 2-channel MUX capability, SO-8 package compatibility, –40°C to +85°C industrial temperature range, 87dB SNR, and guaranteed operation with VREF = VCC in this package variant.
Technical Context
The LTC1865IS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and a 2-bit configuration word shifted via SDI to select between CH0/CH1 in single-ended or differential modes. Its internal VREF-to-VCC connection in the SO-8 package fixes full-scale span to VCC, eliminating external reference components while maintaining rail-to-rail input capability when IN– is grounded.
Conversion is initiated by a rising edge on CONV; tCONV is 2.75–3.3μs. Data is output synchronously on SDO at the falling edge of SCK (full-duplex mode), with timing validated over –40°C to +85°C. Digital I/O meets standard SPI voltage thresholds (VIH ≥ 2.4V, VIL ≤ 0.8V) and supports up to 16.7MHz clock frequency in H-grade, though LTC1865IS8#PBF is rated for standard industrial grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct output codes for high dynamic range measurement |
| Max Sampling Rate | 250ksps - supports real-time capture of signals up to 125kHz full-linear bandwidth |
| SNR | 87dB - enables >14-bit effective resolution in noise-sensitive applications |
| Supply Current | 850μA typical at 250ksps; drops to 2μA at 1ksps via auto-shutdown - extends battery life in portable systems |
| INL Error | ±8 LSB max - ensures monotonicity and accurate end-point linearity across full temperature range |
| Input Span | VREF = VCC (internally tied) - simplifies design by removing need for external reference in SO-8 variant |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating |
Pinout & Package
Package: 8-lead plastic SO (SO-8), body size 3.9mm × 4.9mm, JEDEC MS-012AC, θJA = 175°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV (Pin 1) | Convert Control Input | Rising edge initiates conversion; held high after completion enables auto-shutdown mode |
| CH0 (Pin 2) | Analog Input Channel 0 | Selectable as "+" or "–" input depending on MUX configuration; referenced to GND in single-ended mode |
| CH1 (Pin 3) | Analog Input Channel 1 | Paired with CH0 for differential measurement or used as second single-ended input |
| GND (Pin 4) | Analog Ground | Single-point return for analog circuitry; must connect directly to analog ground plane |
| SDI (Pin 5) | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges after CONV goes low |
| SDO (Pin 6) | Serial Data Output | Outputs 16-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV is high |
| SCK (Pin 7) | Serial Clock Input | Synchronizes both SDI and SDO transfers; supports up to 16.7MHz in industrial grade |
| VCC (Pin 8) | Positive Supply | 5V ±5% supply; internally connects to VREF pin - no external reference required |
Key Features
| Feature | Design Value |
|---|---|
| 2-Channel Software-Selectable MUX | Enables dual-sensor monitoring or differential pair sampling without external multiplexer hardware |
| Auto Shutdown at Low Throughput | Reduces ICC from 850μA to 2μA between conversions - critical for energy-constrained IoT sensor nodes |
| VREF Internally Tied to VCC (SO-8) | Eliminates external reference IC or resistor divider, reducing BOM count and layout area |
| SPI/MICROWIRE-Compatible Interface | Integrates seamlessly with common microcontrollers (e.g., STM32, MSP430) without protocol translation logic |
| True Differential Input Architecture | Rejects common-mode noise on CH0/CH1 pairs - improves accuracy in electrically noisy industrial settings |
Applications
| Portable Instrumentation | Industrial Sensor Interface |
|---|---|
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings from multiple transducers. IC Role / Device Role / Timing Role: Primary 16-bit ADC digitizing analog front-end outputs with channel switching per measurement cycle. Use Value: 250ksps sampling and 87dB SNR enable fast, high-fidelity readings; auto-shutdown extends battery life beyond 100 hours. | Use Scenario: PLC analog input module conditioning and digitizing 4–20mA loop signals from pressure and flow sensors. IC Role / Device Role / Timing Role: Isolated ADC capturing synchronized multi-channel process data at 10ksps–100ksps rates. Use Value: True differential inputs reject common-mode noise from motor drives; –40°C to +85°C rating ensures reliability in factory environments. |
| Remote Data Acquisition | Low-Power Environmental Monitoring |
Use Scenario: Solar-powered weather station logging wind speed, humidity, and solar irradiance over extended periods. IC Role / Device Role / Timing Role: Dual-channel ADC interfacing with resistive and capacitive sensors, triggered by ultra-low-power MCU. Use Value: 2μA sleep current minimizes quiescent drain; SO-8 package allows compact PCB layout compatible with RF modules. | Use Scenario: Battery-operated air quality sensor node measuring PM2.5, CO₂, and VOCs using electrochemical and NDIR sensors. IC Role / Device Role / Timing Role: Precision ADC digitizing low-level sensor outputs with programmable gain and channel sequencing. Use Value: Adjustable input span (via VREF = VCC) accommodates varying sensor output ranges without recalibration. |
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 |
|---|---|---|---|
| ADS8325IPW | 16-bit, 100ksps, SPI interface, 2.7–5.5V supply, no internal MUX; requires external reference | Lower throughput; suited for cost-sensitive, lower-speed precision systems where dual-channel switching is unnecessary | Select when maximum sampling rate < 100ksps and board space permits external reference design |
| MAX11607EEE+ | 16-bit, 200ksps, 8-channel MUX, internal reference, 2.7–3.6V supply only | Higher channel count but incompatible 3.3V-only supply; not drop-in for 5V systems | Choose only for new 3.3V designs requiring >2 channels; not suitable as direct replacement for LTC1865IS8#PBF |
Compared with ADS8325IPW and MAX11607EEE+, the LTC1865IS8#PBF uniquely balances 250ksps speed, dual-channel flexibility, 5V operation, and reference integration in SO-8 - making it optimal for industrial data loggers needing both performance and simplicity.
Availability
LTC1865IS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interface, and remote data acquisition requiring stable component supply, long-term manufacturability, and guaranteed industrial temperature support.
Supply support for LTC1865IS8#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1865IS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for low-power, high-accuracy measurement in space-constrained, battery-operated, and harsh-environment applications.
FAQ
What is the reference voltage configuration for LTC1865IS8#PBF?
The LTC1865IS8#PBF has VREF internally tied to VCC, fixing the full-scale input span to VCC (5V ±5%). This eliminates the need for an external reference source or resistor divider, simplifying design and reducing component count. The specification is confirmed in the Applications Information section for the SO-8 package variant of LTC1865.
Does LTC1865IS8#PBF support true differential input measurements?
Yes, LTC1865IS8#PBF supports true differential input measurements via its software-configurable MUX. When configured for differential mode, it measures the voltage difference between CH0 and CH1 (or CH1 and CH0), rejecting common-mode noise. This capability is explicitly defined in Table 1 (Multiplexer Channel Selection) and Figure 5 (Transfer Curve) of the LTC1865 datasheet.
What is the maximum sampling frequency of LTC1865IS8#PBF over its full temperature range?
The LTC1865IS8#PBF is rated for a maximum sampling frequency of 250ksps at TA = 25°C, and 234ksps over its full industrial temperature range of –40°C to +85°C. This value is specified in the "RECOMMENDED OPERATING CONDITIONS" table under fSMPL(MAX) with the ● symbol denoting full-temperature-range validity.
How does the auto-shutdown feature work on LTC1865IS8#PBF?
The LTC1865IS8#PBF automatically enters low-power shutdown mode when CONV is held high after conversion completion, reducing supply current to 2μA at 1ksps. This behavior is inherent to the device's internal bias and power control circuitry and requires no external configuration. It is documented in the FEATURES list and verified in the Supply Current vs Sampling Frequency graph (Figure G01).
Is LTC1865IS8#PBF pin-compatible with earlier 12-bit versions like LTC1860/LTC1861?
No, LTC1865IS8#PBF is not pin-compatible with LTC1860/LTC1861. While the datasheet states "Pin Compatible with 12-Bit LTC1860/LTC1861", that statement applies only to the LTC1864 (1-channel version) in MSOP packages. The LTC1865IS8#PBF uses a different SO-8 pinout (e.g., SDI on Pin 5, CH0/CH1 on Pins 2/3) versus LTC1860's IN+/IN–/VREF/GND/SCK/SDO/CONV/VCC arrangement.
LTC1865IS8#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):
- 250k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865IS8#PBF FAQ
1.How can I place an order for LTC1865IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865IS8#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 LTC1865IS8#PBF reliable?
The price and inventory of LTC1865IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865IS8#PBF?
LTC1865IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865IS8#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 LTC1865IS8#PBF?
For technical support, including LTC1865IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865IS8#PBF requirements.
6.How does Aetrix verify that LTC1865IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865IS8#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 LTC1865IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865IS8#PBF?
All LTC1865IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865IS8#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 LTC1865IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1865IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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