LTC6078IDD - Dual CMOS R2R Op Amp, 25µV Vos | Analog Devices
N.º de pieza: LTC6078IDD ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.94 | $1.470,00 |
| 1.000 | $2.55 | $2.550,00 |
LTC6078IDD Descripción general
Background: an operational amplifier (op amp) is a DC-coupled, high-gain electronic voltage amplifier with differential inputs and, typically, a single-ended output. Rail-to-rail (R2R) op amps are a specialized class whose input common-mode range and output voltage swing can approach both supply rails, allowing designers to maximize dynamic range in low-voltage single-supply systems. Within the analog signal chain hierarchy, the LTC6078IDD sits between sensors/transducers and ADC input buffers, conditioning millivolt-level signals before digitization.
The LTC6078IDD features a slew rate of 0.05 V/µs, 113 dB open-loop gain (typical), 13 nV/√Hz input voltage noise density at 1 kHz, and 1.5 mA output drive capability. It operates from a single 2.5 V to ±5 V supply (4 V to 18 V total) and is fully specified over the -40 °C to +85 °C industrial temperature range. The DFN-10 (DD) package exposes a thermal pad that lowers junction-to-ambient thermal resistance.
The architecture combines a precision input chopper-stabilized front-end with a class AB output stage, eliminating the crossover distortion common to R2R designs. This dual-stage topology gives the part its rare combination of sub-25 µV offset, sub-50 pA bias current, and rail-to-rail swing - parameters that historically required trade-offs.
Typical applications include battery-powered instrumentation, precision sensor signal conditioning (thermocouples, strain gauges, pH probes), medical instrumentation, A/D converter input buffers, and handheld test equipment. The low 0.55 mA/amp supply current also makes it useful for solar-powered remote sensor nodes.
When designing with the LTC6078IDD, the exposed pad (pin 11) must be soldered to the PCB ground plane for thermal dissipation and rated input common-mode performance. Designers should keep input traces short and guarded when amplifying microvolt-level signals.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para LTC6078IDD — 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:
LTC6078IDD#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC6078IDD#TRPBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC6078AIDD
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC6078AIDD#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC6078IDD Valores máximos y características eléctricas
| Number of Channels | 2 (Dual) |
| Amplifier Type | CMOS, Micropower Precision |
| Input Offset Voltage (max) | 25 µV (at 25 °C) |
| Input Offset Drift (max) | 0.7 µV/°C |
| Input Bias Current (max) | 50 pA |
| Gain Bandwidth Product | 750 kHz |
| Slew Rate | 0.05 V/µs |
| Open-Loop Gain (typ) | 113 dB |
| Quiescent Supply Current (per amp) | 0.55 mA |
| Supply Voltage Range (single) | 2.5 V to 10 V |
| Supply Voltage Range (dual) | ±2.5 V to ±5 V |
| Rail-to-Rail | Input and Output |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C |
| Encapsulado | 10-DFN (3 mm × 3 mm) with exposed pad |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant (PBF suffix) |
Configuración de pines de LTC6078IDD
| Pin 1 | OUT A — Channel A output |
| Pin 2 | V- — Negative supply |
| Pin 3 | IN+ A — Channel A non-inverting input |
| Pin 4 | IN- A — Channel A inverting input |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | IN+ B — Channel B non-inverting input |
| Pin 7 | IN- B — Channel B inverting input |
| Pin 8 | OUT B — Channel B output |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | V+ — Positive supply |
| Pin 11 | EP — Exposed thermal pad (must be soldered to ground plane) |
Aplicaciones típicas
LTC6078IDD es adecuado para 6 aplicacións: Battery-Powered Sensor Signal Conditioning, A/D Converter Input Buffer, Medical Instrumentation Front-End, Precision Industrial Process Control, Handheld Test and Measurement Equipment, Solar-Powered Remote Sensor Nodes.
Battery-Powered Sensor Signal Conditioning
The LTC6078IDD's 0.55 mA quiescent current per amplifier and rail-to-rail input/output swing make it ideal for conditioning low-level signals from thermocouples, strain gauges, and pH probes in battery-powered instrumentation. The 25 µV maximum offset voltage and 0.7 µV/°C drift deliver DC accuracy that rivals chopper-stabilized designs without auto-zero clock noise. Designers typically use one channel as an instrumentation front-end and the second as an active low-pass filter, allowing the entire analog front-end to run from a single 3.3 V or 5 V rail. The 50 pA input bias current preserves accuracy even with source impedances in the megohm range, enabling direct coupling to high-impedance sensors.
Recomendado
A/D Converter Input Buffer
The LTC6078IDD's rail-to-rail input range preserves full-scale dynamic range when buffering 16-bit and 18-bit SAR ADCs from a single 5 V supply, while its 113 dB open-loop gain minimizes buffer-induced linearity errors. The 750 kHz gain-bandwidth product is sufficient to settle 16-bit conversions in less than 1 µs when configured as a unity-gain follower. For precision ADCs, the LTC6078IDD is typically placed between the sensor network and the ADC's reference-grounded input, providing low-impedance drive and absorbing the ADC's switched-capacitor kickback currents.
Recomendado
Medical Instrumentation Front-End
The LTC6078IDD's sub-50 pA bias current and low voltage noise make it well-suited for ECG, EEG, and bio-impedance analog front-ends where microvolt-level signals ride on high-impedance electrodes. The CMOS input stage eliminates the input current spikes common to bipolar op amps that can saturate patient-connected electrodes. Operating from ±5 V supplies, two LTC6078 channels can form a complete instrumentation amplifier with 100 dB common-mode rejection. The DFN-10 package fits inside small wearable form factors, and the industrial temperature grade supports clinical-grade equipment requiring continuous operation.
Recomendado
Precision Industrial Process Control
In 4-20 mA current loops and RTD-based temperature transmitters, the LTC6078IDD provides the low-offset front-end required to resolve sub-0.1 °C temperature changes over a -200 °C to +850 °C PT100/PT1000 range. Its rail-to-rail output drives 24-bit sigma-delta ADCs across the full 0-10 V industrial signal range. Two channels can simultaneously condition the RTD bridge and amplify the cold-junction compensation thermocouple, sharing a single low-noise reference. The DFN-10 footprint enables compact loop-powered transmitters that must dissipate less than 3 mA total quiescent current.
Recomendado
Handheld Test and Measurement Equipment
Battery-powered multimeters, oscilloscope front-ends, and LCR meters benefit from the LTC6078IDD's combination of precision and low quiescent current. Its rail-to-rail input range maximizes dynamic range when measuring small signals on a single 3.3 V lithium cell, while the 750 kHz bandwidth handles audio-band test signals without slew-rate limiting. The exposed-pad DFN-10 package provides thermal headroom for the 0.55 mA × 2 = 1.1 mA continuous dissipation even in sealed enclosures, eliminating the need for external heatsinking in compact handheld cases.
Recomendado
Solar-Powered Remote Sensor Nodes
The LTC6078IDD's micropower 0.55 mA per amplifier consumption allows remote environmental sensor nodes (weather stations, soil monitors, smart agriculture sensors) to operate from small solar cells with energy-harvesting duty cycling. Its 50 pA CMOS input bias current preserves accuracy with high-impedance soil-moisture and pH probes, while the rail-to-rail output swing maximizes ADC dynamic range from single-cell Li-ion or supercapacitor storage. Two channels enable simultaneous measurement of two sensor types - typically temperature plus humidity - sharing one precision reference.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC6078IDD — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC6078IDD#PBF | LTC6078IDD#TRPBF | LTC6078AIDD | LTC6078AIDD#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 10-DFN (3x3) with exposed pad | 10-DFN (3x3) - same | 10-DFN (3x3) - same | 10-DFN (3x3) - same | 10-DFN (3x3) - same |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
| Offset Drift (max) | 0.7 µV/°C | 0.7 µV/°C | 0.7 µV/°C | Improved (enhanced grade) | Improved (enhanced grade) |
| Gain Bandwidth Product | 750 kHz | 750 kHz | 750 kHz | 750 kHz | 750 kHz |
| Slew Rate | 0.05 V/µs | 0.05 V/µs | 0.05 V/µs | 0.05 V/µs | 0.05 V/µs |
| Quiescent Current (per amp) | 0.55 mA | 0.55 mA | 0.55 mA | 0.55 mA | 0.55 mA |
| Rail-to-Rail | Input and Output | Input and Output | Input and Output | Input and Output | Input and Output |
| RoHS Compliance | Check variant (PBF suffix required) | Yes (PBF) | Yes (PBF + TR) | Check variant | Yes (PBF) |
Diferenciadores clave
- Lowest drift in DFN-10 dual CMOS R2R op amp class (frente a LTC6078IDD#PBF)
- Enhanced-spec upgrade path on same footprint (frente a LTC6078AIDD)
- Sub-50 pA CMOS input bias current (frente a LTC6078HMS8 (MSOP-8 sibling))
Notas de diseño
The exposed pad (pin 11) of the LTC6078IDD must be soldered to a PCB ground plane for proper thermal and electrical performance. Estimated: the pad provides ~20% of the die's thermal dissipation path; without it, junction temperature rise at full ±5 V dual-supply operation can exceed 30 °C above ambient. Use a 0.5 oz copper pour extending at least 4 mm × 4 mm beneath the DFN-10 footprint, with at least 6 thermal vias stitching to the inner ground plane.
The LTC6078IDD's CMOS inputs are sensitive to ESD strikes above 2 kV HBM. Place a 100 Ω series resistor or TVS diode at each input when the source impedance exceeds 10 kΩ or when the device is exposed to user-accessible connectors. Estimated: input leakage rises by ~10 pA per volt of overstress above the supply rail, which can swamp the 50 pA bias current specification. For battery-powered sensor interfaces, always AC-couple or clamp inputs before they reach the op amp pins.
When amplifying microvolt-level signals from a strain gauge or thermocouple, route the IN+ and IN- traces as a guarded differential pair with the guard driven by a unity-gain buffer. The LTC6078IDD's 113 dB open-loop gain (typical) makes it particularly sensitive to PCB leakage currents above 100 MΩ trace impedance. Estimated: 1 nA of leakage on a 100 kΩ source impedance creates 100 µV of error - which exceeds the 25 µV max offset spec. Use Teflon standoffs or guard rings for sub-100 µV applications.
Información de cumplimiento
RoHS compliance requires the #PBF suffix. The base LTC6078IDD part number may use SnPb finish; for new designs select #PBF or #TRPBF variants. AEC-Q100 not applicable - industrial grade only.
