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Analog Devices Inc. LTC1864IS8#TRPBF
- Part No.:
- LTC1864IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864IS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,217
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Product details
Overview
LTC1864IS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps single-channel successive approximation ADC with true differential analog inputs, adjustable reference input, and SPI/MICROWIRE-compatible serial interface. It operates on a single 5V supply, draws only 850μA typical supply current at full speed, and auto-shuts down between conversions to reduce current to 2μA at 1ksps. It is used in precision low-power data acquisition systems requiring high resolution and rail-to-rail input capability.
For engineers reviewing the LTC1864IS8#TRPBF datasheet, LTC1864IS8#TRPBF pinout, LTC1864IS8#TRPBF application, or LTC1864IS8#TRPBF equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for industrial sensor interfaces, battery-powered instrumentation, and isolated measurement front-ends.
Technical Context
The LTC1864IS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting unipolar differential input ranges from 0V to VREF with 16-bit no-missing-codes resolution. Its conversion timing is fixed at 2.75–3.3μs (H-grade), enabling deterministic 250ksps sampling with precise SCK-synchronized serial readout via CONV-controlled SDO enable.
It features high-impedance analog inputs (±1μA leakage), 12pF input capacitance in sample mode, and operates across –40°C to +85°C. The SO-8 package variant ties VREF internally to VCC, fixing full-scale span to VCC (4.75V–5.25V), and uses a single GND pin shared for analog and digital domains-unlike the MSOP version's separate AGND/DGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes over full temperature range |
| Max Sampling Rate | 250ksps - supports real-time acquisition of signals up to 125kHz full-linear bandwidth |
| Supply Current | 850μA typ at 250ksps; drops to 2μA at 1ksps via auto-shutdown - enables multi-year battery life in portable designs |
| INL Error | ±8 LSB max (–40°C to +85°C) - ensures <0.12% full-scale linearity error for calibration-sensitive applications |
| Signal-to-Noise Ratio | 87 dB - delivers >14.5 effective number of bits (ENOB) for high-fidelity sensor digitization |
| Analog Input Range | Differential: 0V to VREF (VREF = VCC = 4.75–5.25V); absolute input: –0.05V to VCC + 0.05V - allows direct connection to op-amp outputs without level shifting |
| Reference Configuration | VREF internally tied to VCC in SO-8 package - eliminates external reference component and layout complexity |
Pinout & Package
Package: 8-Lead Plastic SO (Small Outline). RoHS-compliant, lead-free finish, tape-and-reel packaging (TRPBF suffix). Thermal resistance θJA = 175°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Internally connected to VCC in SO-8 package; defines full-scale span as VCC - no external reference required |
| IN+ (Pin 2) | Positive Analog Input | Differential input terminal; sampled simultaneously with IN– for common-mode noise rejection |
| IN– (Pin 3) | Negative Analog Input | Differential input terminal; zero code occurs when IN+ – IN– = 0V |
| GND (Pin 4) | Ground | Single ground pin serving both analog and digital functions - requires low-impedance connection to analog ground plane |
| CONV (Pin 5) | Convert Control Input | Rising edge initiates conversion; falling edge enables SDO output - controls power state and data readiness |
| SDO (Pin 6) | Serial Data Output | 3-wire SPI/MICROWIRE-compatible output; 16-bit result shifted out MSB-first on SCK falling edge |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; max frequency 20MHz (H-grade) - supports high-throughput host interfacing |
| VCC (Pin 8) | Positive Supply | Single 4.75–5.25V supply; must be bypassed with ≥1μF tantalum capacitor directly to GND for stable conversion |
Key Features
| Feature | Design Value |
|---|---|
| True Differential Input Architecture | Rejects common-mode noise on IN+/IN– pair - critical for noisy industrial environments and isolated signal chains |
| Auto-Power-Down Between Conversions | Reduces average current from 850μA to ~2μA at 1ksps - extends battery life by >400× vs continuous operation |
| 16-Bit No-Missing-Codes Performance | Guaranteed monotonicity and linearity over –40°C to +85°C - eliminates interpolation errors in closed-loop control |
| Single-Supply 5V Operation with Rail-to-Rail Input | Accepts 0V to VCC differential input when IN– grounded and VREF = VCC - removes need for external gain/level-shift stages |
| SO-8 Pinout Compatibility with LTC1860/LTC1861 | Enables drop-in 16-bit upgrade path from legacy 12-bit designs - preserves PCB layout and firmware interface |
Applications
| Industrial Sensor Interface | Portable Precision Instrumentation |
|---|---|
|
Use Scenario: Digitizing outputs from strain gauges, RTDs, and bridge sensors in factory-floor PLC modules and condition-monitoring nodes. IC Role / Device Role / Timing Role: Primary 16-bit ADC front-end; performs synchronized sampling triggered by system controller; conversion completes in ≤3.3μs. Use Value: 87dB SNR and ±8 LSB INL ensure sub-0.1% measurement accuracy over temperature - meets Class A industrial sensor standards. |
Use Scenario: Battery-powered handheld multimeters, environmental data loggers, and field calibration tools requiring long runtime and high resolution. IC Role / Device Role / Timing Role: Low-power sampling ADC; enters 2μA sleep mode between 1ksps samples - minimizes quiescent drain. Use Value: 850μA @ 250ksps and auto-shutdown enable >5-year coin-cell operation at 10ksps duty-cycled sampling. |
| Isolated Data Acquisition Channel | Embedded Motor Control Feedback |
|
Use Scenario: High-voltage motor drive monitoring where ADC resides on isolated side, communicating via optocoupler or digital isolator. IC Role / Device Role / Timing Role: Isolated-side ADC; uses 3-wire serial interface compatible with isolated SPI bridges; minimal pin count simplifies isolation barrier routing. Use Value: SO-8 package and single GND pin reduce isolation component count; 125kHz full-linear bandwidth captures torque ripple harmonics. |
Use Scenario: Position/speed feedback digitization in servo drives and BLDC controllers using Hall-effect or resolver-derived analog signals. IC Role / Device Role / Timing Role: Real-time current/voltage sensing ADC; 250ksps rate supports FOC algorithms with <4μs latency per sample. Use Value: Differential input rejects PWM switching noise; 16-bit resolution enables <0.0015° electrical angle resolution in high-pole-count motors. |
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 supply current at full speed | Lower sampling rate limits use in high-bandwidth control loops; wider supply range suits mixed-voltage systems | Select when supply voltage flexibility > speed/power trade-off; not suitable for 250ksps or ultra-low-power requirements |
| MAX11206ETE+ | 16-bit, 250ksps, SPI, 2.7–3.6V supply; internal reference; 1.2mA supply current; no differential input | Single-ended only; incompatible with differential sensor topologies; lower supply voltage excludes 5V system integration | Choose only for 3.3V-only designs with single-ended sources; cannot replace LTC1864IS8#TRPBF in differential or 5V applications |
Compared with ADS8325IPW and MAX11206ETE+, the LTC1864IS8#TRPBF uniquely combines 250ksps speed, 5V single-supply operation, true differential input, and sub-μA sleep current - making it irreplaceable in compact, battery-powered, noise-immune 5V data acquisition systems.
Availability
LTC1864IS8#TRPBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable instrumentation, and isolated data acquisition requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term obsolescence management.
Supply support for LTC1864IS8#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. (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 LTC1864 belongs to ADI's precision data acquisition product line, designed specifically for low-power, high-resolution measurement in space-constrained and energy-sensitive applications such as portable test equipment and distributed industrial sensors.
FAQ
What is the operating temperature range for the LTC1864IS8#TRPBF?
The LTC1864IS8#TRPBF is rated for operation from –40°C to +85°C. This industrial temperature grade is confirmed in the Order Information table and applies to all DC and dynamic specifications unless otherwise noted. The SO-8 package's thermal resistance (θJA = 175°C/W) supports reliable performance within this range under typical PCB copper area and airflow conditions.
Does the LTC1864IS8#TRPBF require an external reference voltage?
No. The LTC1864IS8#TRPBF uses the SO-8 package variant in which the VREF pin is internally tied to VCC. Therefore, the full-scale range is fixed to the supply voltage (4.75V–5.25V), eliminating the need for an external reference. This is explicitly stated in the Applications Information section for the SO-8 version of the LTC1865 and confirmed by the pin function description for LTC1864 SO-8.
What is the maximum clock frequency supported by the LTC1864IS8#TRPBF's SCK input?
The LTC1864IS8#TRPBF supports a maximum SCK frequency of 20MHz for H-grade devices (–40°C to +125°C), and 16.7MHz for standard-grade parts. Since the LTC1864IS8#TRPBF is I-grade (–40°C to +85°C), its maximum SCK frequency is 16.7MHz - sufficient to read 16-bit data in under 1μs per conversion cycle.
How does the auto-shutdown feature of the LTC1864IS8#TRPBF reduce power consumption?
The LTC1864IS8#TRPBF automatically powers down between conversions when the CONV pin remains high after conversion completion. At 1ksps, this reduces supply current from 850μA to 2μA - a 425× reduction. This behavior is inherent to the device's internal timing architecture and requires no software configuration, making it ideal for duty-cycled sampling in battery-powered systems.
Is the LTC1864IS8#TRPBF pin-compatible with earlier 12-bit versions?
Yes. The LTC1864IS8#TRPBF is pin-compatible with the 12-bit LTC1860 and LTC1861 in the SO-8 package. This allows direct hardware replacement without PCB redesign, providing a seamless 16-bit resolution upgrade path while retaining identical footprint, pin functions, and interface protocol.
LTC1864IS8#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC1864IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864IS8#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 LTC1864IS8#TRPBF reliable?
The price and inventory of LTC1864IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1864IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864IS8#TRPBF?
LTC1864IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864IS8#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 LTC1864IS8#TRPBF?
For technical support, including LTC1864IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1864IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1864IS8#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 LTC1864IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1864IS8#TRPBF?
All LTC1864IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864IS8#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 LTC1864IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1864IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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