LT6657AHMS8-5#PBF - 5V 1.5ppm/°C Low Noise Series V-Ref | ADI
N.º de pieza: LT6657AHMS8-5#PBF ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.45 | $8,45 |
| 10 | $7.62 | $76,20 |
| 100 | $6.81 | $681,00 |
| 500 | $6.04 | $3.020,00 |
| 1.000 | $5.32 | $5.320,00 |
LT6657AHMS8-5#PBF Descripción general
A series voltage reference is a type of precision shunt reference that internally regulates the output using an active buffer, providing a much lower dropout than classic Zener or two-terminal shunt topologies. Within the broader taxonomy, a series reference falls under voltage reference -> power management IC -> semiconductor. The buffered output allows direct connection to high-imprecision ADC reference pins, instrumentation amplifier reference nodes, and precision data-acquisition analog supplies, eliminating the need for an external op-amp buffer stage.
Key features of the LT6657 family include advanced curvature compensation that gives predictable drift behavior across the full -40 °C to +125 °C operating range, very low temperature-cycling hysteresis (helping long-term system stability), and a wide operating supply range of up to 36 V (per the LT6657 datasheet). The combination of low noise, low drift, and high output current makes the LT6657AHMS8-5#PBF especially attractive for industrial instrumentation, weigh scales, precision medical monitors, and laboratory data loggers.
The device is built on a BiCMOS process that integrates a precision bandgap cell with curvature-compensation circuitry and a low-noise output buffer. Compared to legacy buried-Zener references, the LT6657 family offers lower quiescent current draw, no heater-zener warm-up drift, and substantially better long-term stability, while still achieving comparable noise performance.
Typical applications include precision 16-bit to 20-bit ADC reference supplies (e.g., driving SAR and sigma-delta converter REFIN pins), high-resolution DAC reference inputs, 4 mA to 20 mA loop transmitters, industrial pressure and temperature transmitters, bench-top multimeter reference rails, and medical instrumentation front ends where reference accuracy directly impacts clinical readings.
When designing with the LT6657AHMS8-5#PBF, add 0.1 µF to 10 µF decoupling close to the supply pin and a 1 µF to 10 µF output capacitor for stable regulation. The exposed thermal pad must be soldered to the PCB ground plane to meet the datasheet's thermal specifications.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers quickly select and source the LT6657AHMS8-5#PBF.
Alternativas directas para LT6657AHMS8-5#PBF — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LT6657AHMS8-3#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT6657AHMS8-2.5#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT6657AHMS8-1.25#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT6657BHMS8-5#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT6657BHMS8-4.096#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT6657AHMS8-5#PBF Especificaciones
| Reference Type | Series, Buffered |
| Tensión de salida | 5 V (fixed) |
| Initial Accuracy | ±0.1 % |
| Temperature Coefficient (Drift) | 1.5 ppm/°C (max) |
| Ruido de salida | 0.5 ppm P-P (0.1 Hz to 10 Hz) |
| Output Current (Source) | 10 mA |
| Rango de temperatura de funcionamiento | -40 °C to +125 °C |
| Encapsulado | 8-pin MSOP (with exposed pad) |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 (per JEDEC J-STD-020) |
| Estado RoHS | Compliant |
| Lead Finish / PBF | Lead-free (PBF suffix) |
| Long-Term Stability / Hysteresis | Very low temperature-cycling hysteresis (per datasheet) |
Configuración de pines de LT6657AHMS8-5#PBF
| Pin 1 | VIN — Supply voltage input |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | GND — Ground |
| Pin 5 | TRIM/NR — Trim and noise-reduction node |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | VOUT — 5 V reference output |
| Pin 9 | EP — Exposed pad - tie to GND for thermal dissipation |
Aplicaciones típicas
LT6657AHMS8-5#PBF es adecuado para 6 aplicacións: Precision 24-bit ADC Reference Supply, Industrial 4-20 mA Loop Transmitter, High-Resolution DAC Reference, Medical Instrumentation Front End, Bench Multimeter Reference Rail, Strain-Gauge Weigh Scale.
Precision 24-bit ADC Reference Supply
The LT6657AHMS8-5#PBF is ideal as a direct 5 V reference for 24-bit sigma-delta ADCs such as the AD7195 family, where reference accuracy directly determines system gain error. With 1.5 ppm/°C drift and 0.5 ppm P-P low-frequency noise, the device supports 20-bit-plus noise-free resolution across industrial temperature ranges. The 10 mA output current comfortably drives multiple ADC reference pins and an external reference buffer if needed. Place a 1 µF to 10 µF low-ESR ceramic close to VOUT and 0.1 µF at VIN. Unlike buried-Zener references, the LT6657's buffered series architecture eliminates warm-up drift and heater-induced temperature rise.
Recomendado
Industrial 4-20 mA Loop Transmitter
The LT6657AHMS8-5#PBF provides a stable 5 V rail for 4-20 mA current-loop transmitters where reference accuracy calibrates loop full-scale error. With 1.5 ppm/°C drift over -40 °C to +125 °C, the reference compensates for both cold-junction and ambient-temperature swings common in process-control cabinets. The buffered output eliminates external buffer amplifiers, reducing BOM count and PCB area. Connect VIN to the loop-derived 24 V supply via a low-dropout pre-regulator and add a 10 µF output capacitor for noise filtering on long field wiring.
Recomendado
High-Resolution DAC Reference
Audio and instrumentation DACs operating at 16-bit to 20-bit resolution benefit from the LT6657AHMS8-5#PBF's 0.5 ppm P-P noise and 1.5 ppm/°C drift. Connecting the 5 V reference to the DAC reference input directly determines differential linearity and total harmonic distortion. The 10 mA source capability supports parallel-driven multi-channel DAC arrays without an additional buffer stage. The exposed thermal pad must be soldered to a continuous ground pour to dissipate the small quiescent heat and maintain drift performance during sustained operation.
Recomendado
Medical Instrumentation Front End
Patient-monitoring and diagnostic instruments such as ECG, EEG, and pulse-oximetry front ends demand ultra-stable voltage references for accurate biopotential measurements. The LT6657AHMS8-5#PBF's 1.5 ppm/°C drift and 0.5 ppm P-P noise help ECG systems achieve the microvolt-level accuracy required by IEC 60601-1 medical safety standards. The wide supply range simplifies integration with isolated DC/DC converter outputs. Place a 1 µF X7R ceramic bypass on VOUT and ensure the exposed pad is soldered for thermal stability during continuous operation.
Recomendado
Bench Multimeter Reference Rail
The LT6657AHMS8-5#PBF serves as the internal 5 V reference for 6.5-digit to 8.5-digit benchtop digital multimeters where long-term absolute accuracy is paramount. With ±0.1 % initial accuracy and 1.5 ppm/°C drift, the part provides the calibration anchor for DC voltage, resistance, and ratio measurements. The buffered series topology avoids the warm-up drift typical of buried-Zener references, allowing faster measurement confidence after power-on. Combine with the ADR3440 for sub-2.5 V reference nodes if multi-range scaling is needed.
Recomendado
Strain-Gauge Weigh Scale
Load-cell and weigh-scale signal chains benefit from the LT6657AHMS8-5#PBF's low-noise, low-drift reference for the bridge excitation and the 24-bit ADC reference simultaneously. The 0.5 ppm P-P noise floor enables microgram-level resolution in precision balances, while the 1.5 ppm/°C drift maintains accuracy across factory-ambient temperature swings. The 10 mA output current can drive both the bridge and the ADC reference without buffering, reducing BOM and PCB footprint. Add a 1 µF to 10 µF output capacitor to suppress load-transient noise from the bridge switching events.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LT6657AHMS8-5#PBF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LT6657AHMS8-3#PBF | LT6657AHMS8-2.5#PBF | LT6657AHMS8-1.25#PBF | LT6657BHMS8-5#PBF | LT6657BHMS8-4.096#PBF |
|---|---|---|---|---|---|---|
| Package | MSOP-8 (with EP) | MSOP-8 (with EP) - same | MSOP-8 (with EP) - same | MSOP-8 (with EP) - same | MSOP-8 (with EP) - same | MSOP-8 (with EP) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Voltage | 5 V | 3 V | 2.5 V | 1.25 V | 5 V | 4.096 V |
| Grade (Drift) | A-grade (1.5 ppm/°C max) | A-grade (1.5 ppm/°C max) | A-grade (1.5 ppm/°C max) | A-grade (1.5 ppm/°C max) | B-grade (tighter drift) | B-grade (tighter drift) |
| Initial Accuracy | ±0.1 % | ±0.1 % | ±0.1 % | ±0.1 % | ±0.1 % | ±0.1 % |
| Output Noise (0.1 Hz-10 Hz) | 0.5 ppm P-P | 0.5 ppm P-P | 0.5 ppm P-P | 0.5 ppm P-P | 0.5 ppm P-P | 0.5 ppm P-P |
| Output Current | 10 mA source | 10 mA source | 10 mA source | 10 mA source | 10 mA source | 10 mA source |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| RoHS / Lead-Free | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) |
Diferenciadores clave
- Series buffered architecture with 10 mA output current (frente a LM4040 family shunt references)
- Industry-leading 1.5 ppm/°C max drift with curvature compensation (frente a Generic 50 ppm/°C references)
- Wide operating supply voltage supports up to 36 V input (frente a LM4040 low-voltage shunt references)
Notas de diseño
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the VIN pin (pin 1) and a 1 µF to 10 µF low-ESR ceramic on VOUT (pin 8). Per the LT6657 datasheet, the output capacitor is required for stable regulation; X7R or X5R dielectrics are recommended. Minimize the VOUT trace length to reduce pickup of digital switching noise from nearby microcontroller or FPGA logic.
The exposed thermal pad (pin 9) of the MSOP-8 package must be soldered to a continuous copper ground pour to meet the datasheet's thermal specifications. Estimated: with θJA ≈ 40 °C/W for the MSOP-8-EP, dissipating 100 mW at full 10 mA load results in a 4 °C junction-temperature rise above ambient, which is well within safe limits. Use multiple thermal vias under the exposed pad to further reduce junction-to-ambient thermal resistance in high-temperature environments.
Do not omit the VOUT capacitor - the LT6657 series reference requires an output capacitor for stable regulation. Avoid routing high-current digital or RF traces directly under the reference IC or its VOUT pin to prevent noise coupling into the reference. For system calibration, allow a 5-minute warm-up period to let the LT6657 reach thermal equilibrium; this eliminates startup drift that may otherwise degrade initial readings in production calibration.
Información de cumplimiento
RoHS compliant per the 'PBF' suffix in the MPN (lead-free designation). Not AEC-Q100 qualified; for automotive applications verify with Analog Devices. Halogen-free status not explicitly stated in the verified web data.
