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Analog Devices Inc. LTC1864LACS8#PBF
- Part No.:
- LTC1864LACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1864LACS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,298
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Product details
Overview
LTC1864LACS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps successive approximation ADC with true differential analog input, single 3V supply operation, and auto-shutdown power management. It features 450µA typical supply current at full speed, 82dB SNR, ±8 LSB INL, and MSOP-8 package - designed for precision, low-power data acquisition in portable instrumentation and isolated sensor interfaces.
For engineers reviewing the LTC1864LACS8#PBF datasheet, LTC1864LACS8#PBF pinout, LTC1864LACS8#PBF application, or LTC1864LACS8#PBF equivalent, key selection criteria include its differential input architecture, external reference flexibility (1V to VCC), SPI/MICROWIRE™-compatible 3-wire serial interface, and guaranteed no missing codes over temperature.
Technical Context
The LTC1864LACS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold. Its conversion cycle is initiated by a rising edge on CONV, completes in 3.7–4.66 µs, and automatically enters sleep mode (10µA) when CONV remains high - enabling dynamic power scaling across sampling frequencies from 1ksps to 150ksps.
Analog inputs (IN+, IN−) operate in unipolar differential mode with high-impedance sampling (±1µA leakage), supporting input spans down to 1V full-scale. The external VREF pin allows ratiometric or absolute measurement configurations, while digital I/O complies with SPI timing (8MHz SCK max) and supports zero-latency data readout after conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-precision voltage digitization |
| Max Sampling Rate | 150ksps - supports real-time capture of signals up to ~20kHz full-linear bandwidth |
| Supply Current | 450µA typ @ 150ksps; drops to 10µA @ 1ksps - enables battery life extension in portable systems |
| INL Error | ±8 LSB max - ensures monotonicity and linearity critical for closed-loop control feedback |
| SNR | 82dB - supports >13 effective bits (ENOB) for clean signal reconstruction |
| Reference Range | 1V to VCC (3.6V max) - permits direct interfacing with low-voltage sensors or precision references |
| Digital Interface | SPI/MICROWIRE™-compatible 3-wire serial - simplifies host MCU integration without additional protocol logic |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, RoHS-compliant, lead-free (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; accepts 1V–VCC; must be bypassed with ≥1µF to AGND for noise immunity |
| IN+ (Pin 2) | Differential Analog Input (+) | High-impedance input sampled simultaneously with IN−; rejects common-mode noise |
| IN− (Pin 3) | Differential Analog Input (−) | Paired with IN+; zero code occurs when IN+ − IN− = 0V |
| GND (Pin 4) | Analog Ground | Primary ground reference for analog circuitry; requires low-inductance connection to analog plane |
| CONV (Pin 5) | Convert Control Input | Rising edge starts conversion; low level enables SDO output; high level triggers auto-shutdown |
| SDO (Pin 6) | Serial Data Output | 16-bit result shifted out MSB-first on falling SCK edge; tri-stated when CONV is high |
| SCK (Pin 7) | Serial Clock Input | Synchronizes data transfer; supports up to 8MHz; receiver captures on rising edge |
| VCC (Pin 8) | Positive Supply | Single 2.7V–3.6V supply; requires local 1µF bypass to GND for stable conversion performance |
Key Features
| Feature | Design Value |
|---|---|
| Auto Shutdown Power Management | Reduces ICC from 450µA to 10µA at 1ksps - eliminates need for external power-gating logic |
| True Differential Input Architecture | Rejects common-mode noise on IN+/IN− pair - enables accurate measurements in electrically noisy environments |
| No Missing Codes Guaranteed | Ensures monotonic transfer function across full temperature range - essential for control system stability |
| Flexible Reference Support | Accepts external VREF from 1V to VCC - allows optimization of dynamic range for low-level sensor outputs |
| Low Input Leakage Current | ±1µA max at TA = 25°C - minimizes gain error when driving high-impedance sources (e.g., piezoelectric sensors) |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-amplitude biopotential signals (ECG, EMG) from dry electrodes in handheld diagnostic devices. IC Role / Device Role / Timing Role: Precision front-end ADC capturing differential bio-signals with minimal power draw and no external op-amp gain stage. Use Value: 16-bit resolution and 82dB SNR enable detection of microvolt-level waveforms; 450µA supply current extends battery life beyond 72 hours per charge. | Use Scenario: Monitoring thermocouple or RTD outputs in distributed PLC I/O modules with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned sensor voltages into digital data for SPI transmission across optocoupler barrier. Use Value: Differential input rejects ground-loop noise; 1V–VCC reference range accommodates isolated 2.5V reference ICs; MSOP-8 footprint minimizes board area. |
| Energy Metering Subsystems | Test & Measurement Front Ends |
Use Scenario: Sampling shunt-based current waveforms in Class 0.5 smart electricity meters operating from coin-cell backup. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC digitizing mV-level current sense signals with ratiometric reference tied to meter's main supply. Use Value: ±8 LSB INL meets IEC 62053 linearity requirements; auto-shutdown cuts quiescent current to 10µA during idle cycles - preserving backup energy. | Use Scenario: Embedded digitizer in handheld oscilloscope or spectrum analyzer capturing transient events at 150ksps. IC Role / Device Role / Timing Role: Standalone sampling ADC feeding FPGA or DSP with synchronized 16-bit samples via compact 3-wire interface. Use Value: 150ksps rate supports Nyquist-limited analysis of signals up to 75kHz; 82dB SNR enables >13-bit ENOB for waveform fidelity. |
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 |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI interface, 1.8V–3.6V supply, ±1.5 LSB INL, no auto-shutdown | Higher speed but higher power (650µA @ 1MSPS); lacks dynamic power scaling for ultra-low-duty-cycle use | Select when sampling rate >150ksps is required and continuous operation justifies higher ICC |
| LTC2311CDHC-16#TRPBF | 16-bit, 500ksps, pseudo-differential input, 2.5V–5.5V supply, ±2.5 LSB INL, internal reference option | Wider supply range and integrated reference simplify BOM; pseudo-differential (not true diff) limits CMRR | Select when system uses 5V rails or requires internal reference; verify CMRR sufficiency for noise-prone layouts |
Compared with ADS8860IDRCT and LTC2311CDHC-16#TRPBF, the LTC1864LACS8#PBF offers superior power efficiency at 150ksps with guaranteed no missing codes and true differential input - making it optimal for battery-powered, noise-sensitive, moderate-speed precision acquisition where layout space and thermal budget are constrained.
Availability
LTC1864LACS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and energy metering subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1864LACS8#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 LTC1864L series belongs to ADI's precision data acquisition portfolio, engineered for ultra-low-power, high-resolution sampling in space- and energy-constrained embedded systems - emphasizing accuracy, simplicity, and robustness in harsh electrical environments.
FAQ
What is the maximum sampling frequency supported by the LTC1864LACS8#PBF?
The LTC1864LACS8#PBF supports a maximum sampling frequency of 150ksps, with guaranteed timing performance across its full operating temperature range (0°C to 70°C). Conversion time is specified as 3.7–4.66 µs, and the device maintains 16-bit no-missing-codes performance at this rate. Higher rates are not supported - attempting to exceed 150ksps may cause timing violations or data corruption.
Does the LTC1864LACS8#PBF require an external reference voltage?
Yes, the LTC1864LACS8#PBF requires an external reference voltage applied to the VREF pin (Pin 1). It supports reference voltages from 1V up to VCC (max 3.6V), enabling flexible full-scale range configuration. Unlike some ADCs, it does not include an internal reference; omitting or misrouting VREF will result in undefined conversion results.
Can the LTC1864LACS8#PBF operate with a 2.7V supply?
Yes, the LTC1864LACS8#PBF is fully specified to operate from 2.7V to 3.6V. At 2.7V supply, it delivers 450µA typical supply current at 150ksps, 82dB SNR, and maintains all key AC/DC specifications including ±8 LSB INL. The datasheet provides complete characterization at 2.7V, confirming robust functionality across the entire valid supply range.
Is the LTC1864LACS8#PBF pin-compatible with the 12-bit LTC1860L/LTC1861L series?
Yes, the LTC1864LACS8#PBF is pin-compatible with the LTC1860L and LTC1861L in the MSOP-8 package. This allows direct 16-bit resolution upgrades in existing designs without PCB layout changes - provided the host firmware supports the extended 16-bit data word and timing requirements remain compatible.
What is the purpose of the CONV pin on the LTC1864LACS8#PBF?
The CONV pin (Pin 5) serves dual functions: a rising edge initiates conversion, and holding it high after conversion completion places the LTC1864LACS8#PBF into auto-shutdown mode (10µA sleep current). When pulled low, it enables the SDO output for serial data readout. This integrated control eliminates the need for separate start-conversion and chip-enable signals.
LTC1864LACS8#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):
- 150k
- Number of Inputs:
- 1
- Input Type:
- Differential
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1864LACS8#PBF FAQ
1.How can I place an order for LTC1864LACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864LACS8#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 LTC1864LACS8#PBF reliable?
The price and inventory of LTC1864LACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864LACS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1864LACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1864LACS8#PBF transactions.
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4.How is shipping managed for LTC1864LACS8#PBF?
LTC1864LACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864LACS8#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 LTC1864LACS8#PBF?
For technical support, including LTC1864LACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864LACS8#PBF requirements.
6.How does Aetrix verify that LTC1864LACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1864LACS8#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 LTC1864LACS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1864LACS8#PBF?
All LTC1864LACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864LACS8#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 LTC1864LACS8#PBF part is unused and in its original packaging.
Return procedure for LTC1864LACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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