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Analog Devices Inc. LTC6655BHLS8-2.5
- Part No.:
- LTC6655BHLS8-2.5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-CLCC
- Datasheet:
-
LTC6655BHLS8-2.5.pdf
- Description:
- IC VREF SERIES 0.025% 8LCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,712
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Product details
Overview
LTC6655BHLS8-2.5 from Analog Devices is a precision bandgap voltage reference delivering 2.5V output with ±0.025% initial accuracy, 2ppm/°C max temperature drift, and ultra-low 0.25ppmP-P (625nVP-P) 0.1Hz–10Hz noise - engineered for high-resolution data acquisition, instrumentation, and automotive-grade sensor signal conditioning where long-term stability and thermal hysteresis control are critical.
For engineers reviewing the LTC6655BHLS8-2.5 datasheet, LTC6655BHLS8-2.5 pinout, LTC6655BHLS8-2.5 application, or LTC6655BHLS8-2.5 equivalent, key selection considerations include hermetic LS8 package stability (30ppm thermal hysteresis over –40°C to 85°C), dual-force/sense output architecture, ±5mA sourcing/sinking capability, and 500mV dropout operation - all validated across –40°C to 125°C.
Technical Context
The LTC6655BHLS8-2.5 implements curvature-compensated bandgap topology with separate force (VOUT_F) and sense (VOUT_S) outputs to eliminate load regulation error via Kelvin sensing. Its internal 2mA sense current enables precise remote load regulation independent of load current magnitude.
It features active shutdown mode (<20µA quiescent), operates from VIN = VOUT + 0.5V (min) to 13.2V, and achieves 100% production testing at –40°C, 25°C, and 125°C - confirming full-range performance compliance for industrial and automotive applications requiring traceable calibration-grade stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.025% (±625µV absolute error at 25°C) |
| Tempco (Drift) | ≤2ppm/°C max (≤250ppm total over –40°C to 125°C) |
| Low-Freq Noise | 0.25ppmP-P (625nVP-P) 0.1Hz–10Hz - enables 24-bit+ ADC systems without noise floor degradation |
| Load Regulation | ≤15ppm/mA (sourcing), ≤45ppm/mA (sinking) - minimized via VOUT_S feedback path |
| Long-Term Drift | 20ppm/√kHr (LS8 package) - 3× better than MSOP variant, critical for uncalibrated field deployments |
| Thermal Hysteresis | 30ppm (–40°C to 85°C) - hermetic ceramic package eliminates humidity-induced stress shifts |
| Shutdown Current | <20µA - enables battery-powered portable instrumentation with multi-year standby life |
Pinout & Package
Package: 8-pin leadless ceramic chip carrier (LS8), 5mm × 5mm, hermetic, surface-mount. Designed for ultra-stable mechanical and environmental performance in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control input | Internal pull-up ensures default enable; external tie-high recommended to prevent noise-induced shutdown |
| 2 - VIN | Power supply input | Operates from VOUT + 0.5V (min) to 13.2V; requires ≥0.1µF local bypass to GND |
| 3, 4, 5, 8 - GND | Device ground terminals | Four dedicated GND pins reduce ground impedance and improve PSRR; all must connect to low-noise system ground plane |
| 6 - VOUT_S | Sense output (Kelvin feedback) | Sinks 2mA; connects directly at load to cancel trace resistance error (RTRACE × 2mA) |
| 7 - VOUT_F | Force output (regulated source) | Sources/sinks ±5mA; requires 2.7µF–100µF output capacitor for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic LS8 packaging | Eliminates humidity sensitivity and reduces thermal hysteresis to 30ppm (–40°C to 85°C), enabling stable operation in uncontrolled environments |
| Dual-output force/sense architecture | Decouples load regulation error from output current - maintains <15ppm/mA accuracy even under dynamic ±5mA loads |
| Ultra-low 0.1Hz–10Hz noise | 625nVP-P enables direct interface with 24-bit sigma-delta ADCs without additional filtering or averaging overhead |
| Full-temperature production test | 100% tested at –40°C, 25°C, and 125°C - guarantees spec compliance across entire automotive/industrial range without derating |
| Low dropout operation | Functions with only 500mV headroom (VIN ≥ 3.0V), supporting single-supply 3.3V systems without LDO pre-regulation |
Applications
| High-Resolution Weigh Scales | Automotive Battery Monitoring Systems |
|---|---|
Use Scenario: Precision strain gauge bridge excitation and ADC reference in Class III/IIIa legal-for-trade weighing instruments operating from –10°C to 50°C ambient. IC Role / Device Role / Timing Role: Primary 2.5V reference for 24-bit delta-sigma ADC and excitation driver - provides stable excitation and conversion reference simultaneously. Use Value: 2ppm/°C drift and 30ppm thermal hysteresis ensure <0.005% linearity error over daily temperature cycles without recalibration. | Use Scenario: Cell voltage monitoring in 12V–48V EV/HEV battery packs exposed to under-hood temperatures up to 125°C. IC Role / Device Role / Timing Role: Reference for isolated ADCs measuring individual Li-ion cell voltages - supplies stable 2.5V to both primary and secondary-side converters. Use Value: Hermetic LS8 package prevents humidity-induced offset shift during condensation events, maintaining ±0.5mV measurement accuracy over 10+ year service life. |
| Portable Medical ECG Monitors | Calibration-Grade Data Loggers |
Use Scenario: Low-power, battery-operated 6-lead ECG front-end requiring sub-µV noise performance and >10-year baseline stability. IC Role / Device Role / Timing Role: Dual-role reference: supplies excitation for instrumentation amplifiers and reference for 24-bit ADC sampling at 1kSPS. Use Value: 0.25ppmP-P noise and <20µA shutdown current enable >7-day continuous operation on coin-cell while preserving diagnostic SNR. | Use Scenario: Unattended environmental monitoring in remote infrastructure (e.g., power substations, telecom cabinets) with no field recalibration access. IC Role / Device Role / Timing Role: Primary reference for multi-channel 22-bit SAR ADCs logging temperature, pressure, and humidity over 15-year deployment. Use Value: 20ppm/√kHr long-term drift ensures <100ppm total drift over 15 years - eliminating need for scheduled hardware replacement or firmware correction tables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR4525BRTZ-REEL7 | 2.5V, ±0.02% initial accuracy, 3ppm/°C drift, SOIC-8 package (non-hermetic), 1.2ppmP-P noise | Higher drift and plastic package limit use in high-humidity or wide-cycling environments | Select when cost sensitivity outweighs hermetic stability requirements and ambient conditions are controlled |
| LTC6655BHMS8-2.5#PBF | Same core specs but in 8-lead MSOP plastic package; 60ppm thermal hysteresis (–40°C to 85°C), 60ppm/√kHr long-term drift | Lower stability makes it unsuitable for uncalibrated field instruments or sealed enclosures with thermal cycling | Select only for lab-grade equipment or short-lifecycle consumer devices where LS8 cost premium is unjustified |
Compared with ADR4525BRTZ-REEL7 and LTC6655BHMS8-2.5#PBF, the LTC6655BHLS8-2.5 delivers superior long-term reliability in thermally aggressive or humid environments due to its hermetic LS8 construction - reducing calibration maintenance intervals by 3–5× in deployed instrumentation.
Availability
LTC6655BHLS8-2.5 is available at Aetrix Electronics and suitable for high-reliability instrumentation, automotive battery management, and medical device applications requiring stable component supply with guaranteed long-term availability and traceable lot-level calibration data.
Supply support for LTC6655BHLS8-2.5 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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC6655 family was designed specifically for metrology-grade voltage reference needs in high-resolution data acquisition systems - prioritizing ultra-low noise, minimal thermal hysteresis, and guaranteed full-temperature-range performance over cost or integration density.
FAQ
What is the maximum allowable input voltage for the LTC6655BHLS8-2.5?
The LTC6655BHLS8-2.5 supports an absolute maximum input voltage of 13.2V relative to GND. Operation above this level risks permanent damage. For reliable long-term performance, VIN should be maintained between VOUT + 0.5V (i.e., 3.0V minimum) and 13.2V, with proper 0.1µF local bypassing to GND as specified in the LTC6655BHLS8-2.5 datasheet.
Does the LTC6655BHLS8-2.5 require external capacitors, and if so, what values?
Yes - the LTC6655BHLS8-2.5 requires a minimum 0.1µF ceramic capacitor from VIN to GND, and an output capacitor between 2.7µF and 100µF from VOUT_F to GND. The LTC6655BHLS8-2.5 datasheet specifies that ESR must be ≤0.1Ω at 100kHz to ensure stability; X7R ceramics are acceptable for most uses, but film capacitors are recommended for ultra-low-noise applications to avoid piezoelectric artifacts.
How does the dual-output (VOUT_F / VOUT_S) architecture of the LTC6655BHLS8-2.5 improve accuracy?
The LTC6655BHLS8-2.5 uses separate force (VOUT_F) and sense (VOUT_S) outputs to implement true Kelvin sensing: VOUT_S sinks a fixed 2mA current and connects directly at the load, allowing the internal regulator to compensate for voltage drop across PCB traces. This eliminates load regulation error - ensuring the LTC6655BHLS8-2.5 maintains ≤15ppm/mA sourcing accuracy regardless of trace resistance or load current magnitude.
What is the thermal hysteresis specification for the LTC6655BHLS8-2.5, and why is it important?
The LTC6655BHLS8-2.5 exhibits 30ppm thermal hysteresis over the –40°C to 85°C cycle, measured as output voltage deviation after returning to 25°C following extreme temperature exposure. This low hysteresis - enabled by the hermetic LS8 ceramic package - ensures repeatable measurements in instruments subjected to daily ambient swings, eliminating calibration drift caused by mechanical stress relaxation in plastic-packaged alternatives.
Can the LTC6655BHLS8-2.5 be used in battery-powered applications with strict power budgets?
Yes - the LTC6655BHLS8-2.5 draws only 5mA typical supply current in normal operation and less than 20µA in shutdown mode when SHDN is tied to GND. Its 500mV dropout allows direct operation from 3.0V lithium batteries, and the internal pull-up on SHDN simplifies control logic. For multi-year battery life, the LTC6655BHLS8-2.5 supports duty-cycled wake-up architectures common in portable instrumentation and wireless sensors.
LTC6655BHLS8-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-CLCC
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.025%
- Temperature Coefficient:
- 2ppm/°C
- Noise - 0.1Hz to 10Hz:
- 0.25ppmp-p
- Noise - 10Hz to 10kHz:
- 0.67ppmrms
- Voltage - Input:
- 13.2V
- Current - Supply:
- 7.5mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-CLCC (5x5)
LTC6655BHLS8-2.5 FAQ
1.How can I place an order for LTC6655BHLS8-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6655BHLS8-2.5 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 LTC6655BHLS8-2.5 reliable?
The price and inventory of LTC6655BHLS8-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6655BHLS8-2.5 is usually 5 days.
3.What payment methods are accepted for LTC6655BHLS8-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6655BHLS8-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6655BHLS8-2.5?
LTC6655BHLS8-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6655BHLS8-2.5 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 LTC6655BHLS8-2.5?
For technical support, including LTC6655BHLS8-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6655BHLS8-2.5 requirements.
6.How does Aetrix verify that LTC6655BHLS8-2.5 is sourced from the original manufacturer or authorized distributors?
All LTC6655BHLS8-2.5 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 LTC6655BHLS8-2.5 meets industry standards.
7.What is the process for return or replacement of LTC6655BHLS8-2.5?
All LTC6655BHLS8-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LTC6655BHLS8-2.5, 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 LTC6655BHLS8-2.5 part is unused and in its original packaging.
Return procedure for LTC6655BHLS8-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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