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Analog Devices Inc. LTC1392CS8#PBF
- Part No.:
- LTC1392CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1392CS8#PBF.pdf
- Description:
- IC DATA ACQ SYSTEM 10BIT 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
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Product details
Overview
LTC1392CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower 10-bit data acquisition IC integrating ambient temperature sensing, on-chip power supply voltage monitoring, and rail-to-rail differential voltage measurement. It delivers ±2°C initial temperature accuracy at 25°C, 10-bit resolution across all three measurement modes, and operates from 4.5V to 6V with 0.2µA idle current - ideal for battery-powered remote sensor nodes and embedded system health monitoring.
For engineers reviewing the LTC1392CS8#PBF datasheet, LTC1392CS8#PBF pinout, LTC1392CS8#PBF application, or LTC1392CS8#PBF equivalent, key selection considerations include its 3-wire half-duplex serial interface timing (250kHz max clock), guaranteed ±4°C full-range temperature error (0°C to 70°C), differential input common-mode range (rail-to-rail), low-power sampling architecture, and SO-8 package compatibility with legacy 8-pin layouts.
Technical Context
The LTC1392CS8#PBF implements a successive approximation register (SAR) ADC with integrated bandgap reference (2.42V), sample-and-hold, analog multiplexer, and proprietary on-die temperature sensor. Its 3-wire serial interface uses falling-edge data transmission and rising-edge capture, supporting both MSB-first and LSB-first output formats via programmable MSBF bit.
Measurement mode is selected dynamically via 4-bit configuration word: temperature (±4°C over 0°C–70°C), VCC supply (4.5V–6V range), or differential voltage (1V or 0.5V full-scale). Conversion time is fixed at 10 clock cycles; analog input sample time requires 1.5 clock cycles. Self-heating is limited to ≤0.455°C in SO-8 package at maximum 700µA active current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit unipolar output for all measurement modes - enables 0.25°C temperature step resolution and 0.977mV/LSB for 1V differential range. |
| Temperature Accuracy | ±2°C at 25°C; ±4°C over full 0°C to 70°C operating range - meets industrial-grade thermal monitoring requirements without external calibration. |
| Supply Voltage Range | 4.5V to 6V - compatible with standard 5V logic systems and tolerant of typical regulator ripple and dropout. |
| Idle Supply Current | 0.2µA typical - extends battery life in always-on sensor applications; wake-up time from CS assertion is 10µs. |
| Differential Input Range | Rail-to-rail common-mode (–0.3V to VCC + 0.3V); selectable 1V or 0.5V full-scale - supports direct current-sense resistor interfacing with no level-shifting. |
| Serial Interface | 3-wire half-duplex (CS, CLK, DIN/DOUT); 250kHz max clock frequency - simplifies isolation barrier design and reduces GPIO count on host MCU. |
| Package | 8-lead SOIC (S8), 150-mil width - industry-standard footprint with θJA = 130°C/W, suitable for high-density PCB layouts. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), narrow body (0.150"), RoHS-compliant, lead-free (Pb-free) finish per #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (Pin 1) | Digital input | Receives 4-bit configuration word (Start, SEL1, SEL0, MSBF) after CS fall; ignored once conversion starts. |
| DOUT (Pin 2) | Digital output | Transmits 10-bit result + null bit on falling CLK edges; tri-states when CS is high. |
| CLK (Pin 3) | Serial clock input | Synchronizes all data transfers; rising edge captures DIN, falling edge outputs DOUT; 150–350kHz operation. |
| CS (Pin 4) | Chip select input | Active-low enable; falling edge initiates conversion sequence; must remain low for entire transfer cycle. |
| GND (Pin 5) | Analog/digital ground | Single ground connection; must tie directly to low-impedance analog ground plane to minimize noise coupling. |
| +VIN (Pin 6) | Positive differential input | Accepts rail-to-rail common-mode signals; used with –VIN for differential voltage or grounded for single-ended VCC sensing. |
| –VIN (Pin 7) | Negative differential input | Completes differential pair; must be kept low-noise; enables current sensing via external RSENSE between +VIN and load. |
| VCC (Pin 8) | Positive supply | 4.5V–6V input; requires local 1µF bypass capacitor to GND; noise sensitivity mandates clean layout near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | On-die thermal transducer with linear output (°C = code/4 – 130); eliminates external thermistor and signal conditioning. |
| Triple-function measurement | Single IC measures ambient temperature, internal VCC, and external differential voltage - reduces BOM count and board area. |
| Rail-to-rail differential input | Supports ±0.3V beyond supply rails; enables direct interface to current-sense resistors without op-amp buffers or level shifters. |
| Low-power serial interface | 3-wire half-duplex protocol minimizes isolation component count; DIN/DOUT can share one trace in isolated designs. |
| Programmable output format | MSB-first or LSB-first data ordering via MSBF bit - ensures seamless integration with diverse MCU serial peripherals (SPI, UART, GPIO bit-bang). |
Applications
| Temperature Monitoring in Portable Medical Devices | Power Supply Health Check in Industrial PLC Modules |
|---|---|
Use Scenario: Continuous ambient temperature logging inside handheld ultrasound or glucose meters where battery life and self-heating error must be minimized. IC Role / Device Role / Timing Role: Primary temperature sensor with on-chip compensation; provides 10-bit digital output every 1–10 seconds via SPI-compatible interface. Use Value: ±2°C accuracy at 25°C and 0.2µA idle current enable >1-year battery operation while meeting IEC 60601 thermal drift limits. |
Use Scenario: Real-time monitoring of 5V backplane supply in modular automation controllers to detect brownout conditions before system reset. IC Role / Device Role / Timing Role: Dedicated VCC monitor measuring internal supply rail; triggered on demand or periodically via host MCU polling. Use Value: Guaranteed 4.5V–6V measurement range and ±15 LSB full-scale error ensure reliable detection of sub-4.7V faults before critical logic failure. |
| Current Sensing in DC Motor Drives | Remote Environmental Data Acquisition Nodes |
Use Scenario: Bidirectional current measurement across shunt resistor in H-bridge motor control for overcurrent protection and torque estimation. IC Role / Device Role / Timing Role: Differential voltage converter with 1V full-scale range; interfaces directly to RSENSE placed between +VIN and motor phase. Use Value: Rail-to-rail common-mode support allows shunt placement on high-side or low-side; 10-bit resolution yields <10mA precision at 10A full scale. |
Use Scenario: Wireless sensor node deployed in HVAC ducts or outdoor enclosures measuring temperature, supply voltage, and auxiliary analog inputs. IC Role / Device Role / Timing Role: Central data acquisition unit; performs sequential measurements and transmits consolidated data via low-power RF link. Use Value: 700µA active current at max sampling rate and 22-second thermal time constant enable stable readings with minimal self-heating in sealed environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower analog monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1298CN8#PBF | 12-bit SAR ADC, no integrated temperature sensor, 3.3V/5V supply, higher 1.2mA active current | Requires external temperature sensor and reference; better resolution but higher power | Choose when higher voltage measurement precision is required and temperature is sensed separately. |
| ADS1118IPW | 16-bit delta-sigma ADC with onboard temperature sensor, 2.0V–5.5V supply, SPI interface, 150µA active current | Higher resolution and wider supply range, but larger 16-pin TSSOP package and different timing model | Choose for enhanced accuracy in new designs where PCB space permits larger footprint and SPI timing constraints allow. |
Compared with LTC1392CS8#PBF, LTC1298CN8#PBF offers greater ADC resolution but lacks monolithic temperature sensing and consumes 6× more active current; ADS1118IPW provides superior 16-bit precision and lower active power but requires PCB redesign due to pin count and package size mismatch.
Availability
LTC1392CS8#PBF is available at Aetrix Electronics and suitable for battery-powered sensor nodes, industrial PLC health monitoring, and portable medical device thermal management requiring stable component supply and long-term lifecycle support.
Supply support for LTC1392CS8#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 technical and manufacturing continuity for legacy Linear products including the LTC1392 series.
The LTC1392CS8#PBF belongs to Linear's micropower data acquisition product line, designed specifically for ultra-low-power embedded sensing where integration of temperature, supply, and differential voltage measurement reduces system complexity and power consumption.
FAQ
What is the operating temperature range for the LTC1392CS8#PBF?
The LTC1392CS8#PBF is specified for commercial-grade operation from 0°C to 70°C. Its temperature sensor achieves ±2°C accuracy at 25°C and ±4°C over this full range. Operation outside this range is not guaranteed and may increase error beyond datasheet limits. The device's junction temperature must not exceed 125°C under any condition.
How does the LTC1392CS8#PBF interface with an 8051 microcontroller?
The LTC1392CS8#PBF interfaces directly with 8051 parallel I/O ports using its 3-wire half-duplex serial protocol. Pins P1.2 (CS), P1.3 (CLK), and P1.4 (DIN/DOUT) connect to any three GPIOs; software bit-bangs the protocol per Figure 1 timing. No external level shifters or buffers are needed since VIH/VIL thresholds (2.0V/0.8V at 5V) match 8051 logic levels.
Can the LTC1392CS8#PBF measure negative temperatures?
Yes - the LTC1392CS8#PBF outputs a 10-bit unipolar code where 0x000 = –130.00°C and 0x3FF = +125.75°C. Equation °C = (Output Code)/4 – 130 applies across the full digital range. At 0°C, the expected code is 0x208 (520 decimal), confirmed by Table 2 in the datasheet.
What is the maximum clock frequency supported by the LTC1392CS8#PBF?
The LTC1392CS8#PBF supports a maximum clock frequency of 350kHz under recommended operating conditions (VCC = 5V). At 250kHz, total cycle time is 74µs; conversion time remains fixed at 10 clock cycles regardless of frequency. Exceeding 350kHz risks timing violations in tWHCLK, tWLCLK, and tdDO parameters.
Does the LTC1392CS8#PBF require external components for basic operation?
Yes - the LTC1392CS8#PBF requires a 1µF ceramic bypass capacitor between VCC and GND, placed as close as possible to Pin 8. No external reference, oscillator, or filtering components are needed for core functionality. External sense resistors are only required when measuring differential voltage or current; temperature and VCC modes operate fully autonomously.
LTC1392CS8#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
- Function:
- Temp Monitoring System (Sensor)
- Sensor Type:
- Internal
- Sensing Temperature:
- 0°C ~ 70°C
- Accuracy:
- ±4°C
- Topology:
- ADC, Multiplexer, Voltage Reference
- Output Type:
- Parallel, Serial
- Output Alarm:
- No
- Output Fan:
- No
- Voltage - Supply:
- 4.5V ~ 6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1392CS8#PBF FAQ
1.How can I place an order for LTC1392CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1392CS8#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 LTC1392CS8#PBF reliable?
The price and inventory of LTC1392CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1392CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1392CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1392CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1392CS8#PBF?
LTC1392CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1392CS8#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 LTC1392CS8#PBF?
For technical support, including LTC1392CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1392CS8#PBF requirements.
6.How does Aetrix verify that LTC1392CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1392CS8#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 LTC1392CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1392CS8#PBF?
All LTC1392CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1392CS8#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 LTC1392CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1392CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1392CS8#PBF Tags
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