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Analog Devices Inc. LTC1864ACS8#TRPBF
- Part No.:
- LTC1864ACS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864ACS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,563
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Product details
Overview
LTC1864ACS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps single-channel differential successive approximation ADC in an 8-lead SOIC package, operating on a single 5V supply with 850μA typical supply current at full speed and auto-shutdown to 2μA at 1ksps. It features true differential analog inputs (IN+, IN–), adjustable external reference input (VREF), SPI/MICROWIRE-compatible 3-wire serial interface, and guaranteed operation from 0°C to 70°C - ideal for compact, battery-powered data acquisition systems requiring high resolution without external gain stages.
For engineers reviewing the LTC1864ACS8#TRPBF datasheet, LTC1864ACS8#TRPBF pinout, LTC1864ACS8#TRPBF application, or LTC1864ACS8#TRPBF equivalent, key selection criteria include its 16-bit no-missing-codes performance, ±2 mV offset error (SO-8), ±20 mV gain error, 87 dB SNR, and rail-to-rail input capability when VREF = VCC - all critical for precision ratiometric sensing, isolated telemetry, and portable instrumentation design.
Technical Context
The LTC1864ACS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, enabling precise 16-bit conversion in 3.2 μs. Its differential input stage rejects common-mode noise, while the adjustable VREF pin supports full-scale spans from 1V to 5V, allowing direct interfacing with low-output sensors without amplification.
Serial communication uses a 3-wire SPI/MICROWIRE protocol: CONV initiates conversion and controls SDO enable/disable, SCK synchronizes data transfer (falling-edge output, rising-edge capture), and SDO outputs 16-bit results MSB-first. Power management is hardware-driven - holding CONV high after conversion forces automatic shutdown, reducing current to leakage levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - ensures monotonicity and full dynamic range utilization in closed-loop control. |
| Sampling Rate | 250ksps maximum - supports anti-aliasing filter design up to 125kHz full linear bandwidth. |
| Supply Current | 850μA at 250ksps; drops to 2μA at 1ksps - enables ultra-low-power operation in duty-cycled sensor nodes. |
| INL Error | ±6 LSB (A-grade, SO-8) - guarantees <0.1% end-point linearity for calibration-sensitive industrial transducers. |
| SNR | 87 dB - delivers >14.2 effective number of bits (ENOB) for high-fidelity signal reconstruction. |
| Input Range | Differential 0V to VREF; absolute IN+ and IN– from –0.05V to VCC + 0.05V - permits robust interfacing with op-amp drivers and noisy environments. |
| Reference Range | VREF = 1V to 5V (externally applied) - enables flexible scaling for 4–20mA loop receivers or thermocouple front-ends. |
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 span; must be low-noise and bypassed with ≥1μF to AGND - directly sets measurement range and accuracy. |
| IN+ (Pin 2) | Differential Analog Input (+) | Positive input of differential pair; sampled simultaneously with IN– for CMRR >80dB at 60Hz. |
| IN– (Pin 3) | Differential Analog Input (–) | Negative input; enables true differential measurement and rejection of shared noise sources. |
| GND (Pin 4) | Analog Ground | Single-point AGND connection point - must tie directly to analog ground plane to minimize PSRR degradation. |
| CONV (Pin 5) | Convert Control Input | Rising edge starts conversion; falling edge enables SDO - dual-function pin simplifies timing control and reduces I/O count. |
| SDO (Pin 6) | Serial Data Output | 3-state output delivering 16-bit result MSB-first on SCK falling edge - compatible with FPGA, MCU, and DSP shift registers. |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; max 20MHz clock rate allows sub-μs readout latency. |
| VCC (Pin 8) | Positive Supply | Single 4.75V–5.25V supply; requires local 1μF tantalum bypass to GND for stable conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto Shutdown Mode | Holding CONV high post-conversion reduces ICC to 2μA - extends battery life in intermittent-sampling applications like environmental monitors. |
| True Differential Input | Simultaneous sampling of IN+ and IN– provides inherent 60Hz/50Hz common-mode rejection - eliminates need for external instrumentation amps in ECG or strain-gauge interfaces. |
| Rail-to-Rail Input Span | When VREF = VCC, full-scale input is 0V to VCC on IN+ (with IN– grounded) - enables direct connection to DAC outputs or microcontroller GPIOs without level-shifting. |
| Low-Leakage Inputs | ±1μA max analog input leakage - preserves accuracy when driving high-impedance sources like piezoelectric sensors or pH electrodes. |
| Guaranteed Operation to +70°C | Validated across 0°C to 70°C ambient - suitable for commercial-grade embedded systems including HVAC controllers and smart meters. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered wearable ECG patch acquiring biopotential signals with minimal power budget. IC Role / Device Role / Timing Role: 16-bit differential ADC digitizing amplified lead-II voltage with 250ksps sampling for real-time QRS detection. Use Value: 87 dB SNR and auto-shutdown enable >7-day operation on coin cell; differential input rejects motion-induced common-mode interference. | Use Scenario: DIN-rail mounted PLC analog input module measuring 4–20mA current loops from pressure transmitters. IC Role / Device Role / Timing Role: Precision ADC converting ratiometric sensor output referenced to stable 2.5V shunt regulator. Use Value: Adjustable VREF (1–5V) and ±2 mV offset error allow direct interface to current-sense resistors without trimming; SO-8 package fits dense I/O layouts. |
| Isolated Data Acquisition | Test & Measurement Front-Ends |
Use Scenario: High-voltage isolation barrier capturing motor phase currents in inverters using optocoupled serial interface. IC Role / Device Role / Timing Role: Isolated-side ADC providing galvanically separated digitization with SPI-level signaling across capacitive isolators. Use Value: 3-wire interface minimizes isolator channel count; 250ksps rate supports accurate harmonic analysis up to 50th order. | Use Scenario: Benchtop multimeter front-end digitizing DC/AC voltage and temperature sensor outputs. IC Role / Device Role / Timing Role: Primary 16-bit converter for high-accuracy DC measurements with programmable gain amplifier (PGA) bypass path. Use Value: No missing codes and ±6 LSB INL ensure repeatable 0.01% reading accuracy; SO-8 footprint allows easy socket replacement during calibration. |
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, ±0.5 LSB INL, 85 dB SNR - slower but lower noise floor and better linearity. | Targeted at high-precision DC measurements (e.g., weigh scales), not high-speed transient capture. | Select when ENOB >14.0 and INL <±1 LSB are mandatory; accept 60% lower throughput and higher cost. |
| MAX11105ETE+ | 16-bit, 500ksps, internal reference, 2.7–3.6V supply only, ±3 LSB INL, 84 dB SNR - faster but limited supply range and fixed VREF. | Optimized for low-voltage portable devices (e.g., handheld DMMs), incompatible with 5V-only systems. | Select for 3.3V systems needing higher speed; avoid if external VREF flexibility or 5V operation is required. |
Compared with ADS8325IPW and MAX11105ETE+, the LTC1864ACS8#TRPBF uniquely balances 250ksps speed, 5V single-supply operation, adjustable external reference, and SO-8 package - making it optimal for cost-sensitive, space-constrained industrial designs where moderate throughput and maximum interface flexibility are prioritized.
Availability
LTC1864ACS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and isolated data acquisition requiring stable component supply, long-term manufacturability, and RoHS-compliant tape-and-reel packaging.
Supply support for LTC1864ACS8#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, serving industrial, automotive, communications, and healthcare markets.
The LTC1864 belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for low-power, high-resolution applications where size, accuracy, and supply simplicity outweigh ultra-high-speed requirements.
FAQ
What is the maximum sampling frequency of the LTC1864ACS8#TRPBF?
The LTC1864ACS8#TRPBF achieves a maximum sampling frequency of 250ksps under recommended operating conditions (VCC = 5V, fSCK ≤ 20MHz). At this rate, conversion time is 3.2 μs and supply current is 850μA. Performance is specified over the full 0°C to 70°C temperature range for the 'A' grade.
Does the LTC1864ACS8#TRPBF require an external reference voltage?
Yes, the LTC1864ACS8#TRPBF requires an external reference voltage applied to the VREF pin (Pin 1). It supports VREF from 1V to 5V, enabling flexible full-scale adjustment. Unlike some ADCs, it does not include an internal reference - this allows optimized noise performance and ratiometric accuracy when paired with precision external references.
Can the LTC1864ACS8#TRPBF operate with a 3.3V supply?
No, the LTC1864ACS8#TRPBF is specified for a single 4.75V to 5.25V supply only. Its absolute maximum VCC is 7V, but operation below 4.75V violates recommended conditions and degrades performance - including reduced SNR, increased INL, and potential failure to meet 16-bit no-missing-codes guarantee. For 3.3V systems, consider alternatives like the MAX11105ETE+.
How does the CONV pin function in the LTC1864ACS8#TRPBF?
The CONV pin (Pin 5) serves two critical functions in the LTC1864ACS8#TRPBF: a rising edge initiates conversion, and a falling edge enables the SDO output driver to shift out the 16-bit result. If CONV remains high after conversion completes, the device enters auto-shutdown mode, drawing only ~2μA. This dual-role pin simplifies timing control and eliminates the need for separate start-convert and data-read strobes.
What is the input impedance of the LTC1864ACS8#TRPBF analog inputs?
The LTC1864ACS8#TRPBF analog inputs exhibit high DC impedance (>1 GΩ) but present dynamic capacitive loading: 12 pF in sample mode and 5 pF during conversion. Input leakage is ±1 μA max. To maintain accuracy, drive sources should have output impedance <200Ω or use fast-settling op-amps (e.g., LT1807) to settle switching transients before conversion begins.
LTC1864ACS8#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1864ACS8#TRPBF FAQ
1.How can I place an order for LTC1864ACS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864ACS8#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 LTC1864ACS8#TRPBF reliable?
The price and inventory of LTC1864ACS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864ACS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1864ACS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864ACS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1864ACS8#TRPBF?
LTC1864ACS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864ACS8#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 LTC1864ACS8#TRPBF?
For technical support, including LTC1864ACS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864ACS8#TRPBF requirements.
6.How does Aetrix verify that LTC1864ACS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1864ACS8#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 LTC1864ACS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1864ACS8#TRPBF?
All LTC1864ACS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864ACS8#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 LTC1864ACS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1864ACS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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