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Analog Devices Inc. LTC1864AIS8#PBF
- Part No.:
- LTC1864AIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864AIS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,418
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Product details
Overview
LTC1864AIS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with true differential analog inputs, single 5V supply operation, and auto-shutdown power management. It features 850μA typical supply current at full speed, 87dB SNR, ±6 LSB INL (A-grade), and operates across –40°C to +85°C in an 8-lead SOIC package. It is used in precision, low-power data acquisition systems requiring high resolution without external gain stages.
For engineers reviewing the LTC1864AIS8#PBF datasheet, LTC1864AIS8#PBF pinout, LTC1864AIS8#PBF application, or LTC1864AIS8#PBF equivalent, key selection criteria include its differential input architecture, adjustable reference support down to 1V full-scale, SPI/MICROWIRE-compatible serial interface, and guaranteed performance over industrial temperature range - all critical for battery-powered instrumentation and isolated sensing designs.
Technical Context
The LTC1864AIS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise 16-bit conversion at up to 250ksps. Its differential input stage rejects common-mode noise, and the adjustable VREF pin allows flexible scaling from 1V to 5V full-scale span.
It uses a 3-wire serial interface (CONV, SCK, SDO) with CONV-controlled conversion initiation and automatic sleep mode entry after conversion completion. The device draws only 2μA at 1ksps, making it suitable for duty-cycled measurement systems where power budget is constrained.
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 | 250ksps - supports real-time capture of signals up to ~125kHz bandwidth (Nyquist-limited) |
| SNR | 87dB - enables >14-bit effective resolution in clean signal environments |
| INL (A-grade) | ±6 LSB - ensures monotonicity and linearity critical for closed-loop control feedback |
| Supply Current @ 250ksps | 850μA typical - allows continuous operation from small Li-ion cells or energy-harvesting sources |
| Reference Range | 1V to VCC - permits direct interfacing with low-voltage sensors without level-shifting circuitry |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood auxiliary sensing applications |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 3.9mm × 4.9mm body, standard JEDEC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale range; accepts 1V–5V; must be bypassed with ≥1μF capacitor to AGND |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance input sampled simultaneously with IN–; supports rail-to-rail input when IN– = GND |
| IN– (Pin 3) | Differential Analog Input (–) | Common-mode rejection path; tied to GND for unipolar single-ended operation |
| GND (Pin 4) | Analog Ground | Primary return for analog circuitry; must connect directly to low-impedance analog ground plane |
| CONV (Pin 5) | Convert Control Input | Rising edge initiates conversion; held high after conversion enters ultra-low-power sleep mode (2μA) |
| SDO (Pin 6) | Serial Data Output | 3-wire SPI/MICROWIRE-compatible output; data valid on falling SCK edge; enabled when CONV is low |
| SCK (Pin 7) | Serial Clock Input | Synchronizes 16-bit data transfer; max frequency 20MHz (H-grade), 16.7MHz (standard) |
| VCC (Pin 8) | Positive Supply | Single 4.75V–5.25V supply; requires local 1μF tantalum bypass to GND for noise-sensitive operation |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Input | Rejects common-mode noise up to full bandwidth; eliminates need for external instrumentation amplifiers in noisy environments |
| Auto Shutdown Mode | Reduces ICC from 850μA to 2μA at 1ksps - extends battery life in intermittent-sampling systems |
| Adjustable Reference Span | Supports 1V–5V VREF - enables direct connection to low-output sensors (e.g., thermocouples, strain gauges) without gain stages |
| Industrial Temperature Range | –40°C to +85°C operation - validated for deployment in factory automation, motor drives, and remote monitoring nodes |
| Pin Compatibility | Drop-in replacement for 12-bit LTC1860/LTC1861 - simplifies resolution upgrades without PCB redesign |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring high-resolution DC/low-frequency AC measurements with long battery life. IC Role / Device Role / Timing Role: Primary ADC capturing sensor outputs; CONV-triggered sampling synchronized to user-initiated measurement cycles. Use Value: 16-bit resolution and 850μA active current enable >10-hour runtime on two AA cells while maintaining 0.0015% measurement accuracy. |
Use Scenario: High-voltage grid monitoring systems using opto-isolated or transformer-coupled front-ends to digitize current/voltage transformers. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned analog signals; powered locally via isolated DC/DC converter. Use Value: Differential input rejects common-mode transients induced by switching power electronics; 87dB SNR preserves dynamic range despite isolation barrier noise. |
| Low-Power Sensor Nodes | Industrial Process Control |
|
Use Scenario: Wireless environmental sensors (temperature, pressure, humidity) deployed in remote locations with solar or energy-harvesting power. IC Role / Device Role / Timing Role: Duty-cycled ADC activated by microcontroller wake-up; sleeps between readings to minimize average current. Use Value: 2μA sleep current and fast wake-up (<3.3μs conversion time) reduce average system power to <10μA per reading - extending node lifetime to years. |
Use Scenario: PLC analog input modules acquiring signals from 4–20mA transmitters, RTDs, and thermocouples in factory floor environments. IC Role / Device Role / Timing Role: Precision front-end ADC in modular I/O card; interfaces to FPGA or ARM-based controller via SPI. Use Value: ±6 LSB INL and –40°C to +85°C rating ensure stable calibration across thermal cycling; 1V–5V VREF flexibility accommodates multiple sensor types on same hardware. |
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, 3.5mW typical power at 100ksps | Lower speed and higher power; no auto-shutdown; requires external reference | Choose for cost-sensitive, lower-speed industrial systems where board space allows external reference design |
| MAX11101ETE+ | 16-bit, 500ksps, internal reference, 2.7–3.6V supply, 2.5mW at 500ksps | Higher speed but narrower supply range; fixed 2.048V reference limits full-scale flexibility | Choose for compact, single-supply 3.3V systems needing faster throughput and internal reference simplicity |
Compared with ADS8325IPW and MAX11101ETE+, the LTC1864AIS8#PBF offers superior power efficiency at 250ksps (850μA vs >2mA), wider reference adjustability (1V–5V), and guaranteed industrial temperature operation - making it optimal for battery-constrained, multi-sensor, or wide-input-span applications.
Availability
LTC1864AIS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and industrial process control requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1864AIS8#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 LTC1864AIS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-resolution measurement in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the LTC1864AIS8#PBF?
The LTC1864AIS8#PBF supports a maximum sampling rate of 250ksps at full 16-bit resolution. This is achieved with a minimum conversion time of 2.75μs (typical) and requires SCK frequencies up to 20MHz for H-grade variants. At lower speeds, the device automatically reduces supply current - dropping to 2μA at 1ksps - preserving accuracy while optimizing power.
Does the LTC1864AIS8#PBF require an external reference voltage?
No, the LTC1864AIS8#PBF does not require an external reference, but it is designed to accept one. Its VREF pin supports externally applied references from 1V to 5V, enabling flexible full-scale adjustment. When no external reference is used, VREF may be tied to VCC for a 5V full-scale span - a configuration validated across the –40°C to +85°C operating range for the LTC1864AIS8#PBF.
How does the CONV pin function in the LTC1864AIS8#PBF?
The CONV pin on the LTC1864AIS8#PBF serves dual roles: a rising edge initiates conversion, and holding it high after conversion completion places the device into ultra-low-power sleep mode (2μA). A falling edge enables the SDO pin to output data. This control scheme eliminates the need for separate power-down commands and simplifies timing-critical firmware implementations in the LTC1864AIS8#PBF.
What is the input impedance of the LTC1864AIS8#PBF analog inputs?
The LTC1864AIS8#PBF analog inputs exhibit high DC impedance (>1GΩ) but present dynamic capacitive loading during sampling (12pF in sample mode). To avoid settling errors, source impedances should remain below 200Ω, or high-speed op amps (e.g., LT1807, LT1810) must condition the signal. This behavior is inherent to its switched-capacitor SAR architecture and is fully characterized in the LTC1864AIS8#PBF datasheet.
Is the LTC1864AIS8#PBF pin-compatible with earlier 12-bit versions?
Yes, the LTC1864AIS8#PBF is pin-compatible with the 12-bit LTC1860 and LTC1861 in the same 8-lead SOIC package. This allows direct drop-in replacement to upgrade resolution without layout changes. All pin functions - VREF, IN+, IN–, GND, CONV, SDO, SCK, and VCC - match identically, and the serial interface protocol remains compatible, simplifying migration paths for existing LTC1864AIS8#PBF-based designs.
LTC1864AIS8#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:
- -
LTC1864AIS8#PBF FAQ
1.How can I place an order for LTC1864AIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864AIS8#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 LTC1864AIS8#PBF reliable?
The price and inventory of LTC1864AIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864AIS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1864AIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864AIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864AIS8#PBF?
LTC1864AIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864AIS8#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 LTC1864AIS8#PBF?
For technical support, including LTC1864AIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864AIS8#PBF requirements.
6.How does Aetrix verify that LTC1864AIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1864AIS8#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 LTC1864AIS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1864AIS8#PBF?
All LTC1864AIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864AIS8#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 LTC1864AIS8#PBF part is unused and in its original packaging.
Return procedure for LTC1864AIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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