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Analog Devices Inc. LTC6655CHLS8-2.5
- Part No.:
- LTC6655CHLS8-2.5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-CLCC
- Datasheet:
-
LTC6655CHLS8-2.5.pdf
- Description:
- IC VREF SERIES 0.05% 8LCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
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Product details
Overview
LTC6655CHLS8-2.5 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 - enabling high-resolution data acquisition in instrumentation, weigh scales, and medical equipment where long-term stability and thermal hysteresis <30ppm (–40°C to 85°C) are critical.
For engineers reviewing the LTC6655CHLS8-2.5 datasheet, LTC6655CHLS8-2.5 pinout, LTC6655CHLS8-2.5 application, or LTC6655CHLS8-2.5 equivalent, this page provides verified specifications, LS8 hermetic package details, load regulation (<15ppm/mA sourcing), shutdown current (<20µA), and real-world design implications for precision analog signal chains.
Technical Context
The LTC6655CHLS8-2.5 uses advanced curvature-compensated bandgap architecture to achieve predictable, monotonic temperature behavior across –40°C to 125°C. Its dual-output topology (VOUT_F and VOUT_S) enables Kelvin sensing for <10ppm/mA load regulation error, independent of trace resistance.
It operates from VIN = VOUT + 0.5V (min) to 13.2V, supports ±5mA source/sink, and integrates a logic-compatible active-low SHDN pin with internal pull-up - eliminating external biasing while ensuring reliable low-power mode entry (<20µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.025% (±625µV) - eliminates system-level calibration in 16-bit+ ADC applications |
| Tempco (Drift) | ≤2ppm/°C over –40°C to 125°C - ensures <250ppm total drift across full industrial range |
| Low-Freq Noise | 0.25ppmP-P (625nVP-P, 0.1Hz–10Hz) - preserves ENOB in high-gain, low-bandwidth sensor interfaces |
| Long-Term Drift | 20ppm/√kHr (LS8 package) - predicts <100ppm drift over 25 years in stable environments |
| Thermal Hysteresis | 30ppm (–40°C to 85°C) - enables repeatable measurements after thermal cycling in field-deployed gear |
| Load Regulation | <15ppm/mA (sourcing), <45ppm/mA (sinking) - maintains accuracy under dynamic load conditions |
| Shutdown Current | <20µA - supports battery-powered portable instruments with multi-year standby life |
Pinout & Package
Package: 8-lead ceramic LCC (LS8), 5mm × 5mm, hermetic, surface-mount - provides humidity immunity and superior long-term stability vs. plastic MSOP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Pulled up internally; tie to GND for <20µA shutdown; external pull-high recommended for noise immunity |
| 2 - VIN | Power supply input | Operates from VOUT + 0.5V to 13.2V; requires ≥0.1µF local bypass capacitor |
| 3, 5, 8 - GND | Internal ground terminals | All must be connected to clean system ground plane; not optional - ensures PSRR >100dB |
| 4 - GND | Main device ground | Primary return path; lowest impedance connection point for reference ground routing |
| 6 - VOUT_S | Sense input (Kelvin) | Sinks 2mA; connect directly at load to cancel trace IR drop - reduces load regulation error to RTRACE × 2mA |
| 7 - VOUT_F | Force output | Sources/sinks ±5mA; requires 2.7µF–100µF output capacitor (low-ESR film or X7R) for stability |
Key Features
| Feature | Design Value |
|---|---|
| No humidity sensitivity | Hermetic LS8 ceramic package eliminates moisture-induced drift - critical for outdoor or uncontrolled-environment deployments |
| Dual-output Kelvin sensing | VOUT_F/VOUT_S separation enables true remote sensing - achieves <10ppm/mA effective load regulation in PCB layouts with >100mΩ trace resistance |
| Guaranteed temp range | Fully tested at –40°C, 25°C, and 125°C - removes need for derating or corner-case validation in automotive/industrial designs |
| Low dropout operation | Min VIN = VOUT + 0.5V - allows use with low-headroom supplies (e.g., 3.0V rail powering 2.5V reference) |
| High PSRR | >100dB at DC, >60dB to 10kHz - rejects switching regulator noise without additional filtering |
Applications
| Instrumentation Calibration | Weigh Scale Front-End |
|---|---|
|
Use Scenario: High-accuracy benchtop multimeter requiring 24-bit ADC excitation with sub-ppm stability over 8-hour calibration cycles. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference input and DAC feedback path. Use Value: 2ppm/°C drift and 30ppm thermal hysteresis ensure measurement repeatability without re-zeroing during ambient lab temperature swings. |
Use Scenario: Industrial platform scale measuring 0–100kg with 1g resolution using strain gauge bridge and 20-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Stable excitation source for bridge and reference for ADC conversion. Use Value: 0.25ppmP-P low-frequency noise prevents digitization of mechanical vibration artifacts, preserving true weight resolution. |
| Medical Patient Monitor | Precision Battery Monitor |
|
Use Scenario: Portable ECG device acquiring microvolt-level cardiac signals with 120dB SNR requirement over 0–50°C operating range. IC Role / Device Role / Timing Role: Reference for analog front-end PGA and ADC in biopotential signal chain. Use Value: Hermetic LS8 package prevents humidity-induced baseline drift during clinical use in humid environments (e.g., hospitals, ambulances). |
Use Scenario: Lithium-ion battery fuel gauge in industrial IoT sensor node requiring accurate state-of-charge estimation over 10-year field life. IC Role / Device Role / Timing Role: Reference for ADC measuring cell voltage and current-sense amplifier offset calibration. Use Value: 20ppm/√kHr long-term drift ensures <100ppm total reference error after 25,000 hours - enabling reliable SoC accuracy without periodic recalibration. |
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% init acc, 3ppm/°C drift, 1.2µVP-P (0.1–10Hz), SOIC-8 | Higher noise (1.2µV vs. 0.625µV), non-hermetic package, no Kelvin sensing | Lower-cost option where LS8 stability and ultra-low noise are not required |
| REF5025IDR | 2.5V, ±0.05% init acc, 3ppm/°C drift, 1.8µVP-P (0.1–10Hz), SOIC-8 | Looser initial accuracy, higher noise, plastic package, no shutdown | Entry-level alternative for cost-sensitive, non-critical industrial monitoring |
Compared with ADR4525BRTZ-REEL7 and REF5025IDR, the LTC6655CHLS8-2.5 delivers 2× lower noise, hermetic stability, and Kelvin sensing - making it uniquely suited for metrology-grade systems where reference-induced error must remain below 1ppm in final product specification.
Availability
LTC6655CHLS8-2.5 is available at Aetrix Electronics and suitable for instrumentation calibration, medical patient monitors, and precision battery monitors requiring stable component supply with guaranteed long-term parametric consistency and hermetic reliability.
Supply support for LTC6655CHLS8-2.5 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 ICs, serving precision, industrial, automotive, and communications markets.
The LTC6655 family was designed specifically for metrology-grade applications demanding sub-ppm stability, ultra-low noise, and guaranteed performance across extended temperature ranges - with the LS8 variant targeting mission-critical systems where humidity and long-term drift are unacceptable.
FAQ
What is the maximum supply voltage for LTC6655CHLS8-2.5?
The LTC6655CHLS8-2.5 supports a maximum supply voltage of 13.2V. Operation above this level risks permanent damage per Absolute Maximum Ratings. The device functions down to VIN = VOUT + 0.5V (i.e., 3.0V minimum for the 2.5V version), enabling compatibility with low-headroom power rails while maintaining full specified performance across –40°C to 125°C.
Does LTC6655CHLS8-2.5 require an output capacitor, and what value is recommended?
Yes, LTC6655CHLS8-2.5 requires an output capacitor between 2.7µF and 100µF for stability, low noise, and controlled turn-on time. A 10µF low-ESR X7R ceramic or film capacitor is typical; for ultra-low-noise applications, polypropylene or PPS film capacitors are preferred to avoid piezoelectric noise. ESR must be ≤0.1Ω at 100kHz to prevent oscillation.
How does the dual-output (VOUT_F / VOUT_S) configuration improve accuracy in LTC6655CHLS8-2.5?
The LTC6655CHLS8-2.5's VOUT_F (force) and VOUT_S (sense) pins implement Kelvin sensing: VOUT_S sinks 2mA and connects directly at the load, rejecting voltage drop across PCB traces. This reduces load regulation error to RTRACE × 2mA - enabling <10ppm/mA effective regulation even with 50mΩ trace resistance, unlike single-output references.
What is the thermal hysteresis specification for LTC6655CHLS8-2.5, and why does it matter?
LTC6655CHLS8-2.5 exhibits ≤30ppm thermal hysteresis over –40°C to 85°C (per datasheet Note 9). This means output voltage returns within 30ppm of its original 25°C value after cycling between those extremes - critical for field instruments that experience daily temperature swings but must maintain calibration integrity without user intervention.
Can LTC6655CHLS8-2.5 be used in battery-powered devices, and what is its shutdown current?
Yes, LTC6655CHLS8-2.5 supports battery operation via its active-low SHDN pin: pulling SHDN to GND reduces supply current to <20µA (max), enabling multi-year standby in portable instrumentation. An internal pull-up ensures default operation if SHDN is left open, but external pull-high is recommended to prevent noise-induced shutdown in noisy environments.
LTC6655CHLS8-2.5 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:
- ±0.05%
- Temperature Coefficient:
- 5ppm/°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)
LTC6655CHLS8-2.5 FAQ
1.How can I place an order for LTC6655CHLS8-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6655CHLS8-2.5 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 LTC6655CHLS8-2.5 reliable?
The price and inventory of LTC6655CHLS8-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6655CHLS8-2.5 is usually 5 days.
3.What payment methods are accepted for LTC6655CHLS8-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6655CHLS8-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6655CHLS8-2.5?
LTC6655CHLS8-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6655CHLS8-2.5 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 LTC6655CHLS8-2.5?
For technical support, including LTC6655CHLS8-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6655CHLS8-2.5 requirements.
6.How does Aetrix verify that LTC6655CHLS8-2.5 is sourced from the original manufacturer or authorized distributors?
All LTC6655CHLS8-2.5 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 LTC6655CHLS8-2.5 meets industry standards.
7.What is the process for return or replacement of LTC6655CHLS8-2.5?
All LTC6655CHLS8-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LTC6655CHLS8-2.5, 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 LTC6655CHLS8-2.5 part is unused and in its original packaging.
Return procedure for LTC6655CHLS8-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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