ADA4895-1ARZ-RL7 - 1nV/√Hz, G≥10 Stable Op Amp | Analog Devices
N.º de pieza: ADA4895-1ARZ-RL7 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.08 | $30,80 |
| 100 | $2.74 | $274,00 |
| 500 | $2.47 | $1.235,00 |
| 1.000 | $2.19 | $2.190,00 |
ADA4895-1ARZ-RL7 Descripción general
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used in signal conditioning, filtering, and mathematical operations. The ADA4895-1 belongs to the class of high-speed voltage feedback amplifiers, which are optimized for wide bandwidth and fast slew rate, making them suitable for applications requiring large dynamic range and precision. Within the hierarchy of analog ICs, it sits under linear amplifiers, which are fundamental building blocks in electronic systems.
Key features include a small signal bandwidth of 236 MHz at a gain of +10, a slew rate of 943 V/μs, and a settling time of 22 ns to 0.1%. The spurious-free dynamic range (SFDR) is -72 dBc at 2 MHz, ensuring low distortion in high-frequency signal paths. The device is available in an 8-lead SOIC package (ARZ suffix), with tape and reel packaging (RL7) for automated assembly.
The ADA4895-1 utilizes a voltage feedback architecture with complementary bipolar transistors, achieving low noise and high speed simultaneously. The rail-to-rail output stage maximizes dynamic range, while the wide supply voltage range supports both 5 V and 10 V systems. The amplifier is stable for gains of 10 or greater, which simplifies compensation in non-inverting and inverting configurations.
Typical applications include ultrasound imaging front-ends, low-noise preamplifiers for sensors, and high-speed signal conditioning in test and measurement equipment. Its low noise and high bandwidth make it ideal for amplifying small signals from photodiodes, microphones, and other transducers.
When designing with this amplifier, ensure that the gain is set to at least 10 to maintain stability. Use proper power supply decoupling with 0.1 μF ceramic capacitors close to the supply pins, and consider the thermal performance of the SOIC package in high-power applications.
Alternativas directas para ADA4895-1ARZ-RL7 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ADA4895-1ARZ-RL7 (mismo factor de forma y huella) — difiere en Package, Gain Bandwidth Product, Slew Rate.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADA4895-1ARZ-RL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADA4895-1ARZ
✅ Sustitución directa✓ En stock
$2.19 / unidad
Ver hoja de datos →AD8099ARDZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
OPA847IDR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ADA4895-1ARZ-RL7 Valores máximos y características eléctricas
| Number of Channels | 1 |
| Amplifier Type | Voltage Feedback |
| Gain Bandwidth Product | 236 MHz (at G=+10) |
| Slew Rate | 943 V/μs |
| Input Voltage Noise Density | 1 nV/√Hz (typical) |
| 1/f Noise at 10 Hz | 2 nV/√Hz |
| Supply Voltage Range | 3 V to 10 V |
| Quiescent Current per Amplifier | 3 mA |
| Rail-to-Rail Output | Yes |
| Settling Time to 0.1% | 22 ns |
| Spurious-Free Dynamic Range (SFDR) | -72 dBc at 2 MHz |
| Minimum Stable Gain | 10 |
| Rango de temperatura de funcionamiento | -40°C to +125°C |
| Encapsulado | 8-Lead SOIC (ARZ) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de ADA4895-1ARZ-RL7
| Pin 1 | OUT — Amplifier output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — No connect |
| Pin 6 | NC — No connect |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connect |
Aplicaciones típicas
ADA4895-1ARZ-RL7 es adecuado para 6 aplicacións: Ultrasound Imaging Front-End, Low-Noise Preamplifier, High-Speed Signal Conditioning, Test and Measurement Equipment, RF and IF Signal Processing, Portable Medical Devices.
Ultrasound Imaging Front-End
The ADA4895-1's low input noise (1 nV/√Hz) and high bandwidth (236 MHz) make it ideal for amplifying the small echo signals in ultrasound systems. Its high slew rate (943 V/μs) ensures fast response to pulsed signals, while the rail-to-rail output maximizes dynamic range. The wide supply range (3 V to 10 V) supports various system voltages, and the low quiescent current (3 mA) is beneficial for portable ultrasound devices.
Recomendado
Low-Noise Preamplifier
With 1 nV/√Hz input noise and 2 nV/√Hz at 10 Hz, the ADA4895-1 is perfect for low-noise preamplifiers in sensor interfaces, microphone preamps, and instrumentation. Its high gain stability (≥10) allows precise amplification of weak signals, and the rail-to-rail output ensures full-scale swing. The low quiescent current (3 mA) makes it suitable for battery-powered equipment.
Recomendado
High-Speed Signal Conditioning
The ADA4895-1's 236 MHz bandwidth and 943 V/μs slew rate enable high-speed signal conditioning in data acquisition, video, and communication systems. Its fast settling time (22 ns to 0.1%) ensures accurate sampling, and the low distortion (-72 dBc SFDR) preserves signal integrity. The wide supply range supports both 5 V and 10 V rails.
Recomendado
Test and Measurement Equipment
In oscilloscopes, spectrum analyzers, and signal generators, the ADA4895-1 provides low-noise, high-bandwidth amplification for accurate signal reproduction. Its high slew rate and fast settling time are critical for pulse measurements, while the low noise floor ensures precise small-signal analysis. The SOIC package is easy to integrate into PCB designs.
Recomendado
RF and IF Signal Processing
The ADA4895-1's high bandwidth and low distortion make it suitable for IF amplification in radio receivers and transmitters. Its low noise improves receiver sensitivity, and the rail-to-rail output allows direct interface to ADCs. The wide supply range accommodates various RF system voltages, and the low quiescent current is advantageous for portable RF devices.
Recomendado
Portable Medical Devices
The ADA4895-1's low power (3 mA) and wide supply range (3 V to 10 V) make it ideal for battery-powered medical devices such as portable ECG monitors and hearing aids. Its low noise ensures accurate biopotential signal acquisition, and the small SOIC package saves board space. The high bandwidth supports fast signal processing for real-time monitoring.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADA4895-1ARZ-RL7 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADA4895-1ARZ-RL | ADA4895-1ARZ | AD8099ARDZ | OPA847IDR |
|---|---|---|---|---|---|
| Package | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Voltage Noise | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz | 0.95 nV/√Hz | 0.85 nV/√Hz |
| Bandwidth (G=+10) | 236 MHz | 236 MHz | 236 MHz | 3.8 GHz (GBW) | 3.9 GHz (GBW) |
| Slew Rate | 943 V/μs | 943 V/μs | 943 V/μs | 1350 V/μs | 950 V/μs |
| Quiescent Current | 3 mA | 3 mA | 3 mA | 15 mA | 18 mA |
| Supply Voltage Range | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V | 5 V to 12 V | 5 V to 12 V |
| Minimum Stable Gain | 10 | 10 | 10 | 1 (unity) | 1 (unity) |
Diferenciadores clave
- Ultra-low input noise of 1 nV/√Hz (frente a AD8099ARDZ)
- Low quiescent current of 3 mA (frente a OPA847IDR)
- Wide supply range of 3 V to 10 V (frente a AD8099ARDZ)
Notas de diseño
Place 0.1 μF ceramic capacitors close to the V+ and V- pins to decouple the power supply. Use a ground plane to minimize noise pickup. Keep feedback resistors and input traces short to reduce parasitic capacitance and maintain stability.
The ADA4895-1 is not unity-gain stable; it requires a gain of at least 10. Operating at lower gains can cause oscillation. Ensure the feedback network sets the gain to ≥10. Also, avoid excessive capacitive loading on the output, which can degrade stability.
The SOIC package has a thermal resistance of approximately 158°C/W (theta_JA). At a supply voltage of 10 V and quiescent current of 3 mA, power dissipation is 30 mW, resulting in a temperature rise of about 5°C. This is acceptable, but for higher output currents, consider the thermal impact.
Información de cumplimiento
RoHS compliant per Analog Devices datasheet. AEC-Q100 not applicable for this commercial-grade part.
