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Analog Devices Inc. LTC1864IS8#PBF
- Part No.:
- LTC1864IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864IS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,407
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Product details
Overview
LTC1864IS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with true differential analog inputs, adjustable reference input, and SPI/MICROWIRE-compatible serial interface in an 8-lead SO package. It operates on a single 5V supply, draws only 850μA at full speed, and auto-shutdowns to 2μA at 1ksps. Designed for high-precision, low-power data acquisition in industrial sensors and portable instrumentation.
For engineers reviewing the LTC1864IS8#PBF datasheet, LTC1864IS8#PBF pinout, LTC1864IS8#PBF application, or LTC1864IS8#PBF equivalent, key selection criteria include guaranteed operation from –40°C to +85°C, differential input architecture enabling common-mode noise rejection, 87dB SNR at 10kHz, and SO-8 footprint compatibility with legacy 12-bit LTC1860/LTC1861 designs.
Technical Context
The LTC1864IS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting unipolar differential input ranges up to VREF (1V to 5V). Its conversion cycle is initiated by a rising edge on CONV, completing in 2.75–3.3μs, after which it enters sleep mode if CONV remains high.
Digital interface uses 3-wire SPI/MICROWIRE protocol: SCK synchronizes data transfer, SDO outputs 16-bit results on falling edges, and CONV doubles as chip-select and power-control signal-low to enable SDO output, high to initiate conversion and auto-shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 part in 65,536 measurement granularity for high-accuracy sensor digitization |
| Max Sampling Rate | 250ksps - supports real-time capture of signals up to 125kHz full-linear bandwidth |
| Supply Current | 850μA typical at 250ksps; drops to 2μA at 1ksps - enables battery-powered operation for >1 year with proper duty cycling |
| Signal-to-Noise Ratio | 87dB at DC–10kHz - ensures <0.0002% RMS noise floor for precision voltage monitoring |
| INL Error | ±8 LSB max over temperature - guarantees monotonicity and ≤0.12% full-scale linearity error |
| Analog Input Range | Differential: 0V to VREF (1V–5V); Absolute: IN+ and IN– each −0.05V to VCC+0.05V - allows direct connection to transducer outputs without level-shifting |
| Operating Temp | −40°C to +85°C - qualified for industrial control, automotive under-hood sensing, and outdoor instrumentation |
Pinout & Package
Package: 8-lead plastic SO (Small Outline), surface-mount, JEDEC MS-012AC compliant; thermal resistance θJA = 175°C/W; rated for 150°C max junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; accepts 1V–5V external reference or connects to VCC for ratiometric operation |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance input sampled simultaneously with IN−; rejects common-mode noise when paired |
| IN− (Pin 3) | Differential Analog Input (−) | Completes differential pair; zero code occurs when IN+ − IN− = 0V |
| GND (Pin 4) | Analog Ground | Single-point connection to analog ground plane; must be isolated from digital return paths |
| CONV (Pin 5) | Convert Control / Chip Select | Rising edge starts conversion; low state enables SDO output; high state after conversion triggers auto-sleep |
| SDO (Pin 6) | Serial Data Output | 3-state output delivering 16-bit result MSB-first on falling SCK edges; Hi-Z when CONV = high |
| SCK (Pin 7) | Serial Clock Input | Accepts up to 20MHz clock (H-grade); synchronizes bit transfer timing and controls sampling window |
| VCC (Pin 8) | Positive Supply | 4.75V–5.25V single supply; requires ≥1μF tantalum bypass to GND adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown between conversions | Reduces average current to ~2μA at 1ksps, enabling ultra-low-power wake-up sampling in IoT nodes |
| True differential input architecture | Rejects common-mode noise up to 125kHz bandwidth, eliminating need for external instrumentation amps in noisy environments |
| Adjustable reference input (1V–5V) | Supports direct interfacing with low-voltage sensors (e.g., 1V-output RTD bridges) without gain stages |
| Guaranteed operation to +85°C | Validated performance across full industrial temperature range, eliminating derating concerns in embedded controllers |
| SPI/MICROWIRE™-compatible interface | Interoperates with standard microcontroller SPI peripherals without protocol translation or glue logic |
Applications
| Industrial Process Monitoring | Portable Medical Instrumentation |
|---|---|
Use Scenario: Continuous voltage monitoring of 4–20mA loop transmitters in PLC I/O modules. IC Role / Device Role / Timing Role: Precision 16-bit digitizer converting conditioned analog signals into digital values for Modbus RTU transmission. Use Value: 87dB SNR and ±8 LSB INL ensure <0.1% total measurement uncertainty over temperature, meeting IEC 61000-4-2 immunity requirements. | Use Scenario: Battery-powered ECG front-end acquiring lead-II differential biopotentials. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing 1kS/s waveform data with minimal self-heating in handheld devices. Use Value: 850μA active current and 2μA sleep current extend AA battery life to >18 months at 10% duty cycle. |
| Isolated Data Acquisition Systems | Automotive Sensor Signal Conditioning |
Use Scenario: High-voltage motor phase current sensing using isolated amplifiers feeding into ADC side of digital isolator. IC Role / Device Role / Timing Role: Isolated-side digitizer receiving analog signals via SiO₂-isolated amplifier outputs. Use Value: Differential input rejects ground-loop noise induced by switching inverters; 125kHz full-linear bandwidth captures PWM ripple harmonics. | Use Scenario: Cold-junction compensation in automotive exhaust gas temperature (EGT) measurement circuits. IC Role / Device Role / Timing Role: High-accuracy thermocouple reference junction digitizer operating in engine bay ambient. Use Value: −40°C to +85°C rating and ±2mV offset error guarantee stable cold-junction readings despite thermal cycling. |
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 auto-shutdown; higher 1.5mA typical supply current | Lower sampling rate limits use in dynamic signal capture; better suited for always-on industrial controllers than battery systems | Select when system requires wider supply range and lower cost, and can tolerate higher power draw |
| MAX11603EEE+ | 16-bit, 250ksps, internal reference, 2.7–3.6V supply; no external VREF pin; 1.2mA typical current | Fixed 2.048V reference eliminates external reference design but prevents ratiometric or custom span configurations | Select when board space is constrained and fixed reference suffices; avoid when interfacing with 5V sensors or needing VREF = VCC |
Compared with ADS8325IPW and MAX11603EEE+, the LTC1864IS8#PBF uniquely combines 250ksps speed, 850μA active current, adjustable reference, and −40°C to +85°C qualification-making it optimal for compact, battery-aware, and thermally demanding industrial data loggers.
Availability
LTC1864IS8#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, and isolated data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1864IS8#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 LTC1864IS8#PBF belongs to ADI's legacy Linear Technology precision data converter family, engineered specifically for low-power, high-resolution industrial and instrumentation applications where accuracy, thermal stability, and small-footprint integration are critical.
FAQ
What is the maximum sampling frequency of the LTC1864IS8#PBF?
The LTC1864IS8#PBF achieves a maximum sampling frequency of 250ksps at 25°C and −40°C to +85°C operating temperature. This is guaranteed for the I-grade version per datasheet Table "RECOMMENDED OPERATING CONDITIONS", with conversion time specified as 2.75–3.3μs. Performance remains stable across the full temperature range due to on-chip trimming and robust SAR architecture.
Does the LTC1864IS8#PBF support external reference voltages?
Yes, the LTC1864IS8#PBF supports external reference voltages from 1V to 5V applied to the VREF pin. This enables ratiometric measurements, low-voltage sensor interfacing, and improved noise immunity versus internal references. The device maintains full 16-bit performance across this range, with gain error specified at ±20mV and INL at ±8 LSB.
How does the auto-shutdown feature work on the LTC1864IS8#PBF?
The LTC1864IS8#PBF automatically powers down between conversions when the CONV pin is held high after conversion completion. At 1ksps, this reduces supply current to 2μA typical. The feature is inherent to the SAR architecture and requires no configuration-simply leave CONV high between samples to engage sleep mode and minimize average power consumption.
Is the LTC1864IS8#PBF pin-compatible with earlier Linear Technology ADCs?
Yes, the LTC1864IS8#PBF is pin-compatible with the 12-bit LTC1860/LTC1861 in the same SO-8 package. Pin mapping (VREF, IN+, IN−, GND, CONV, SDO, SCK, VCC) matches exactly, enabling drop-in upgrades to 16-bit resolution without PCB redesign-provided layout accommodates increased analog performance requirements like ground separation and bypassing.
What is the differential input voltage range specification for the LTC1864IS8#PBF?
The differential input voltage range for the LTC1864IS8#PBF is 0V to VREF, where VREF is externally applied (1V–5V). The absolute input voltage range for IN+ and IN− individually is −0.05V to VCC + 0.05V, allowing safe operation with small negative transients or overshoots. This supports direct connection to op-amp buffers and isolated signal chains without clamping diodes.
LTC1864IS8#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:
- 1
- Input Type:
- Single Ended
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1864IS8#PBF FAQ
1.How can I place an order for LTC1864IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864IS8#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 LTC1864IS8#PBF reliable?
The price and inventory of LTC1864IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1864IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864IS8#PBF?
LTC1864IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864IS8#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 LTC1864IS8#PBF?
For technical support, including LTC1864IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864IS8#PBF requirements.
6.How does Aetrix verify that LTC1864IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1864IS8#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 LTC1864IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1864IS8#PBF?
All LTC1864IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864IS8#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 LTC1864IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1864IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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