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Analog Devices Inc. LTC1864LCMS8#PBF
- Part No.:
- LTC1864LCMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1864LCMS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:620
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Product details
Overview
LTC1864LCMS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps single-channel differential successive approximation ADC in an 8-lead MSOP package, operating from a single 2.7V–3.6V supply with 450µA typical supply current at full speed and auto-shutdown to 10µA at 1ksps. It features true differential analog inputs (IN+, IN–), external reference pin (VREF), SPI/MICROWIRE-compatible 3-wire serial interface, and is optimized for low-power, high-precision data acquisition in portable instrumentation and isolated sensing systems.
For engineers reviewing the LTC1864LCMS8#PBF datasheet, LTC1864LCMS8#PBF pinout, LTC1864LCMS8#PBF application, or LTC1864LCMS8#PBF equivalent, key selection criteria include its 16-bit resolution with ±6 LSB INL, 82dB SNR, 150ksps sampling rate, differential input architecture, and MSOP-8 thermal performance (θJA = 210°C/W) - all critical for battery-powered, space-constrained, ratiometric or externally referenced measurement designs.
Technical Context
The LTC1864LCMS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting unipolar differential input ranges from 0V to VREF (1V–3.6V). Its conversion timing is fixed at 3.7–4.66µs, synchronized by the rising edge of CONV and data readout on falling SCK edges, with no minimum data transfer rate requirement.
It uses a 3-wire serial interface (CONV, SCK, SDO) without SDI - unlike the dual-channel LTC1865L - and relies on external reference voltage for full-scale definition. The device powers down automatically between conversions, reducing current consumption proportionally with sampling frequency, and supports rail-to-rail input operation when IN– is grounded and VREF = VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-fidelity signal digitization |
| Max Sampling Rate | 150ksps - enables real-time capture of signals up to ~75kHz Nyquist bandwidth |
| Supply Current | 450µA typ at 150ksps; drops to 10µA at 1ksps - enables multi-year battery life in intermittent-sampling applications |
| INL Error | ±6 LSB max - ensures monotonicity and <0.1% full-scale linearity error across temperature |
| SNR | 82dB - supports >13.3 effective number of bits (ENOB) for precision sensor interfacing |
| Analog Input Range | 0V to VREF (1V–3.6V) differential - allows direct connection to low-output-impedance sensors without gain stages |
| Reference Input | External VREF pin - enables ratiometric measurements or stable absolute scaling via precision reference ICs |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm lead pitch, θJA = 210°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Defines full-scale span; must be low-noise and bypassed with ≥1µF to AGND for accuracy |
| 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 | Must connect directly to analog ground plane; separates analog return from digital paths |
| CONV (Pin 5) | Convert control input | Rising edge initiates conversion; held high after completion to enter auto-shutdown mode |
| SDO (Pin 6) | Serial data output | 16-bit result shifted out MSB-first on falling SCK edges; tri-stated when CONV is high |
| SCK (Pin 7) | Serial clock input | Synchronizes data transfer; supports DC to 8MHz; no minimum clock rate required |
| VCC (Pin 8) | Positive supply | 2.7V–3.6V single supply; requires local 1µF tantalum bypass to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| True differential input architecture | Rejects common-mode noise and interference, enabling accurate measurements in electrically noisy environments |
| Auto-shutdown between conversions | Reduces average supply current from 450µA to 10µA at 1ksps - extends battery life without software intervention |
| No minimum data transfer rate | Allows flexible host MCU timing; eliminates need for precise clock synchronization or continuous polling |
| 16-bit upgrade path from 12-bit LTC1860L/LTC1861L | Pin-compatible replacement offering 16× finer resolution while retaining same MSOP-8 footprint and interface |
| High input impedance & reduced span support | Enables direct connection to transducers with output spans as low as 1V full-scale, eliminating external op-amp gain stages |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter or environmental sensor node powered by coin-cell or Li-ion battery with intermittent sampling. IC Role / Device Role / Timing Role: Primary 16-bit ADC digitizing differential sensor outputs (e.g., thermocouple, bridge transducer) under microcontroller control. Use Value: 450µA active current and 10µA sleep current enable >5-year battery life at 1-sample-per-second duty cycle. | Use Scenario: Industrial field transmitter with galvanic isolation between sensor front-end and digital back-end. IC Role / Device Role / Timing Role: Isolated-side ADC converting analog sensor signals before transmission across opto- or capacitive isolator. Use Value: Differential input and external VREF allow ratiometric operation referenced to isolated power supply, minimizing drift from supply variations. |
| Low-Power Remote Monitoring | Compact Signal Conditioning |
Use Scenario: Wireless node measuring strain gauge or pressure sensor in structural health monitoring, transmitting data every 10 seconds. IC Role / Device Role / Timing Role: Precision ADC interfaced to low-noise instrumentation amplifier, feeding data to ultra-low-power MCU and RF transceiver. Use Value: 82dB SNR and ±6 LSB INL ensure sub-0.1% measurement accuracy over temperature, critical for long-term trend analysis. | Use Scenario: Space-constrained medical device (e.g., wearable ECG front-end) requiring high-resolution analog signal capture in minimal PCB area. IC Role / Device Role / Timing Role: Final-stage ADC in analog signal chain, accepting conditioned differential output from programmable-gain amplifier. Use Value: MSOP-8 package (3mm × 3mm) and 16-bit resolution in single-chip solution eliminate need for external sample-hold or reference buffers. |
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 |
|---|---|---|---|
| LTC1864IMS8#PBF | Same silicon, –40°C to 85°C industrial temp grade vs. 0°C to 70°C for LTC1864LCMS8#PBF | Required for extended-temperature deployments (e.g., automotive cabin, outdoor infrastructure) | Select LTC1864IMS8#PBF when operation beyond 70°C ambient is needed; identical pinout, timing, and electrical specs |
| ADS8325IDGSR | Texas Instruments 16-bit 100ksps SAR ADC; 2.7V–5.5V supply; SPI interface; 1.2mW at 100ksps | Lower sampling rate but higher supply voltage flexibility and integrated reference option | Choose ADS8325IDGSR if system uses 5V logic or requires internal reference; not pin-compatible, needs layout revision |
Compared with LTC1864IMS8#PBF, the LTC1864LCMS8#PBF offers lower cost for commercial-temperature applications, while ADS8325IDGSR provides wider supply range and integrated reference at the expense of 33% lower throughput and non-drop-in layout compatibility.
Availability
LTC1864LCMS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and low-power remote monitoring requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for LTC1864LCMS8#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC1864L family.
The LTC1864L series was designed specifically for ultra-low-power, high-resolution data acquisition in space- and energy-constrained systems, emphasizing minimal active/sleep current, differential input fidelity, and ease of integration with microcontrollers via simple 3-wire serial interface.
FAQ
What is the maximum sampling rate of the LTC1864LCMS8#PBF?
The LTC1864LCMS8#PBF achieves a maximum sampling rate of 150ksps, with a guaranteed conversion time of 3.7–4.66µs. This rate is maintained across the full operating temperature range (0°C to 70°C) and supply voltage range (2.7V–3.6V), enabling reliable real-time digitization of signals up to 75kHz without aliasing.
Does the LTC1864LCMS8#PBF require an external reference voltage?
Yes, the LTC1864LCMS8#PBF requires an external reference voltage applied to the VREF pin to define its full-scale input range. It supports VREF from 1V to VCC (3.6V), allowing ratiometric operation with sensor excitation supplies or precision absolute scaling using references like the LT1460. No internal reference is provided.
Can the LTC1864LCMS8#PBF operate with a 5V supply?
No, the LTC1864LCMS8#PBF is rated for a maximum supply voltage of 3.6V. Applying 5V to VCC exceeds its Absolute Maximum Rating and will damage the device. For 5V systems, consider the pin-compatible LTC1864CS8 (5V version) or alternative 16-bit ADCs such as the ADS8325IDGSR.
What is the purpose of the CONV pin on the LTC1864LCMS8#PBF?
The CONV pin on the LTC1864LCMS8#PBF serves two functions: a rising edge initiates conversion, and holding it high after conversion completes places the device into auto-shutdown mode (10µA sleep current). A falling edge enables the SDO pin to output the 16-bit result synchronized to SCK, making it central to both timing control and power management.
Is the LTC1864LCMS8#PBF pin-compatible with the LTC1860L series?
Yes, the LTC1864LCMS8#PBF is pin-compatible with the 12-bit LTC1860L/LTC1861L in the MSOP-8 package. This allows direct hardware replacement to upgrade resolution from 12-bit to 16-bit without PCB redesign, preserving existing layout, routing, and firmware interface while delivering 16× finer quantization and improved dynamic range.
LTC1864LCMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1864LCMS8#PBF FAQ
1.How can I place an order for LTC1864LCMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1864LCMS8#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 LTC1864LCMS8#PBF reliable?
The price and inventory of LTC1864LCMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1864LCMS8#PBF is usually 5 days.
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4.How is shipping managed for LTC1864LCMS8#PBF?
LTC1864LCMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1864LCMS8#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 LTC1864LCMS8#PBF?
For technical support, including LTC1864LCMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1864LCMS8#PBF requirements.
6.How does Aetrix verify that LTC1864LCMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1864LCMS8#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 LTC1864LCMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1864LCMS8#PBF?
All LTC1864LCMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1864LCMS8#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 LTC1864LCMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1864LCMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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