LTC6655BHMS8-1.25#PBF - 0.25ppm 1.25V Precision Reference | ADI
Référence : LTC6655BHMS8-1.25#PBF ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.6 | $8,60 |
| 10 | $7.85 | $78,50 |
| 100 | $7.2 | $720,00 |
| 500 | $6.75 | $3 375,00 |
| 1 000 | $6.3 | $6 300,00 |
LTC6655BHMS8-1.25#PBF Présentation
A voltage reference is a circuit that produces a stable, known output voltage independent of supply variations, load changes, and temperature, serving as the measurement yardstick of an entire signal chain. Within the power-management hierarchy, a series voltage reference behaves like a precision linear regulator with a fixed, ultra-accurate output: it sits between the supply rail and the ADC or DAC reference pin, converting a noisy, drifting supply into a rock-steady voltage from which all conversions are scaled.
Key features of the LTC6655 family include exceptionally low 0.25ppm p-p noise (625nV p-p for the 2.5V member over 0.1Hz to 10Hz), low 2ppm/°C maximum drift, ±0.025% maximum initial accuracy, and full specification from -40°C to 125°C. The B-grade LTC6655BHMS8-1.25#PBF is the precision-grade 1.25V member, and the PBF suffix guarantees lead-free, lead-free-solderable construction.
Architecturally, the LTC6655 is a complete family of precision bandgap references with an integrated low-noise output buffer. The buffered series topology allows the reference to source up to 5mA of output current while maintaining low output impedance, so the reference can directly drive an ADC reference input or a bank of converters without an external buffer amplifier. For the 1.25V, 2.048V, and 2.5V versions, the minimum supply is set by internal circuitry requirements regardless of load.
Typical applications include high-resolution data-acquisition systems, precision instrumentation and test equipment, industrial process-transmitter interfaces, and medical sensing front ends, where reference noise and drift directly set system resolution and calibration interval.
Design consideration: budget 2.7uF or more of ceramic capacitance at the output per the datasheet recommendations to preserve stability and noise performance, and keep the input well decoupled.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found together in the manufacturer datasheet. Pricing shown as of 2026-10-21.
Alternatives de remplacement direct pour LTC6655BHMS8-1.25#PBF — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC6655AHMS8-1.25#PBF
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LTC6655CHMS8-1.25#PBF
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LTC6655ILS8-1.25#PBF
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LTC6655BHLS8-1.25#PBF
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LTC6655-1.25
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC6655BHMS8-1.25#PBF Spécifications
| Tension de sortie | 1.25 V fixed |
| Initial Accuracy | ±0.025% max |
| Output Noise (0.1Hz to 10Hz) | 0.25 ppm p-p |
| Temperature Drift | 2 ppm/°C max |
| Output Current | 5 mA (source) |
| Reference Type | Series, buffered, bandgap |
| Plage de température de fonctionnement | -40°C to +125°C |
| Boîtier | 8-MSOP |
| Type de montage | Surface Mount |
| Manufacturer Grade | B (precision) |
| Lead-Free (PBF) | Yes |
| Product Family | LTC6655 (0.25ppm noise, low drift precision buffered reference family) |
| LTspice Model Availability | Yes (LTC6655-1.25) |
Guide de configuration des broches du LTC6655BHMS8-1.25#PBF 8-msop
Configuration des broches du LTC6655BHMS8-1.25#PBF (boîtier 8-msop). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour LTC6655BHMS8-1.25#PBF.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
LTC6655BHMS8-1.25#PBF convient pour 6 applications: High-Resolution Data Acquisition, Precision Instrumentation and Bench Test Equipment, Industrial Process Control and 4-20mA Transmitters, Medical Diagnostic and Patient-Monitoring Front Ends, Precision DAC Output Scaling and Audio Systems, Portable and Battery-Powered Precision Systems.
High-Resolution Data Acquisition
The LTC6655BHMS8-1.25#PBF is a natural reference for 18-to-24-bit ADC systems because reference noise and drift, not converter resolution, usually set achievable accuracy. Its 0.25ppm p-p noise in the 0.1Hz to 10Hz band keeps reference-induced ripple far below one LSB at a 1.25V span, while 2ppm/°C max drift bounds scale-factor error over the -40°C to +125°C range to a fraction of the converter's linear range. Used as a series reference driving the ADC reference pin directly, the integrated 5mA buffer eliminates an external reference buffer stage, saving board area and one error source. Place at least 2.7uF of ceramic capacitance at the reference pin per the datasheet to absorb dynamic reference currents during conversions.
Recommandé
Precision Instrumentation and Bench Test Equipment
Instrumentation and test equipment demand references whose errors do not require frequent recalibration, and the LTC6655BHMS8-1.25#PBF addresses this with ±0.025% max initial accuracy and 2ppm/°C max drift fully specified from -40°C to +125°C. In DMM front ends, calibrators, and sensor-signal conditioners, the 1.25V output provides a symmetric-rail-friendly reference that can be amplified or divided to set the measurement scale, and the low 0.25ppm p-p low-frequency noise keeps zero-drift visible in quiet-scale readings. Because the part is a buffered series reference, it tolerates varying loads as instrument ranges switch. The LTspice model (LTC6655-1.25) permits noise and transient simulation of the complete measurement chain before prototype.
Recommandé
Industrial Process Control and 4-20mA Transmitters
Industrial transmitters must hold calibration for years across wide ambient temperatures, making the LTC6655BHMS8-1.25#PBF's 2ppm/°C max drift and -40°C to +125°C full specification directly relevant. In a 4-20mA loop transmitter, the reference sets both the ADC conversion scale and the DAC or current-driver output scale, so reference drift translates directly into loop-error percent of span; a 1.25V reference also permits low-voltage ratiometric sensing of bridge or RTD excitation. The 5mA buffered output can excite the sensor bridge while simultaneously feeding the ADC, guaranteeing ratio-metric cancellation of excitation drift. Verify supply headroom since the -1.25 option's minimum supply is set by internal circuitry requirements.
Recommandé
Medical Diagnostic and Patient-Monitoring Front Ends
Medical sensing front ends - ECG/EEG amplifiers, blood-pressure bridges, and biosensor arrays - require references with negligible low-frequency noise so that sub-millivolt physiological signals are not contaminated. The LTC6655BHMS8-1.25#PBF's 0.25ppm p-p noise (0.1Hz to 10Hz) sits well below typical electrode signal levels, and the 1.25V output supports low-voltage, battery-friendly analog rails common in portable monitors. The buffered series topology maintains regulation as scan-rate and channel-loading change across multiplexed input channels, avoiding cross-channel scale errors. Because the part is fully specified from -40°C to +125°C, it also supports autoclave-adjacent and sterilization-adjacent equipment environments with appropriate derating.
Recommandé
Precision DAC Output Scaling and Audio Systems
High-performance DACs scale their output directly from the reference, so reference noise appears as in-band distortion; the LTC6655BHMS8-1.25#PBF's 0.25ppm-class low-frequency noise keeps it below the DAC's own noise floor. A 1.25V reference suits converter families whose reference input range tops out near 1.25V or bipolar output stages using symmetric ±1.25V scaling. The integrated 5mA buffer drives the DAC reference pin directly, absorbing the switching reference-current pulses typical of sigma-delta modulators when supported by local ceramic decoupling. In audio and instrumentation DAC stages this removes the external reference buffer that would otherwise add its own noise and drift to the output path.
Recommandé
Portable and Battery-Powered Precision Systems
In battery-powered loggers and handheld meters, the LTC6655BHMS8-1.25#PBF's low-voltage 1.25V output and series-buffered architecture let designers run precision conversion directly from a single lithium or two-cell alkaline stack, since the -1.25 option's minimum supply is set by internal circuitry requirements regardless of load condition per the datasheet. The 5mA buffer supports intermittent converter activation typical of duty-cycled logging, and full specification to +125°C covers sealed enclosures in sunlight. Designers should verify quiescent current against the battery budget in the datasheet electrical tables and use the LTspice LTC6655-1.25 model to confirm start-up behavior at low battery voltage across the full temperature range.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC6655BHMS8-1.25#PBF — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC6655AHMS8-1.25#PBF | LTC6655CHMS8-1.25#PBF | LTC6655ILS8-1.25#PBF | LTC6655BHLS8-1.25#PBF |
|---|---|---|---|---|---|
| Package | 8-MSOP | 8-MSOP - same | 8-MSOP - same | 8-MSOP - same | 8-MSOP - same |
| Brand | Analog Devices (Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Voltage | 1.25 V fixed | 1.25 V fixed | 1.25 V fixed | 1.25 V fixed | 1.25 V fixed |
| Initial Accuracy | ±0.025% max (B grade) | Tighter (A grade) | Relaxed (C grade) | I grade (relaxed) | ±0.025% max (B grade) |
| Output Current | 5 mA | 5 mA | 5 mA | 5 mA | 5 mA |
Principaux différenciateurs
- Ultra-low 0.25ppm p-p low-frequency noise (vs LTC6655CHMS8-1.25#PBF)
- Tighter accuracy grade at same footprint (vs LTC6655ILS8-1.25#PBF)
- Integrated 5mA output buffer removes external reference buffer (vs LTC6655CHMS8-1.25#PBF)
Notes de conception
Decouple the LTC6655 output with at least 2.7uF of good-quality ceramic capacitance as recommended by the Linear Technology/ADI datasheet, placed within a few millimeters of the VOUT pin, plus a 0.1uF cap for high-frequency bypass. Keep the reference output trace short and direct to the ADC/DAC reference pin, and do not share it with load-current-carrying traces. For the -1.25 option, note the datasheet states minimum supply is set by internal circuitry supply requirements regardless of load condition, so verify input rail margin at lowest battery or supply tolerance.
Sigma-delta and SAR converters draw transient currents from the reference pin during conversion; even with the LTC6655's integrated 5mA buffer, reference recovery time appears as conversion-to-conversion scale error if decoupling is inadequate. Estimated guideline: with 2.7uF of output capacitance, a 1mA, 1us reference-current pulse shifts the reference by roughly Q/C = 1uA*1us/2.7uF ≈ 0.37uV, or about 0.3ppm at 1.25V - acceptable for 24-bit systems but marginal if capacitance is omitted. Route switching-regulator components away from the reference plane and guard the reference with ground pour.
Do not confuse package-grade suffixes: the B grade (this part) carries ±0.025% max initial accuracy and 2ppm/°C max drift, while C and I grades relax those limits - substituting a lower grade silently degrades accuracy even though the footprint is identical. Also, datasheet load-regulation specs exclude load regulation errors for certain min-supply statements, so do not infer load regulation from the min-supply note. Finally, the LTC6655-1.25's supply minimum differs from the -3/-5 members, whose minimum supply is set by load current; check the correct table for the 1.25V option.
Informations de conformité
#PBF suffix denotes lead-free (Pb-free) package construction. RoHS compliance per ADI precision-reference family practice; confirm REACH/halogen-free/conflict-minerals declarations per order code on the ADI product page. Not an AEC-Q100 qualified part.
