ADA4805-2ARMZ-RL7 - Dual 105MHz Low Power Op Amp | Analog Devices
MPN： ADA4805-2ARMZ-RL7 ✓ 啟用中ADA4805-2ARMZ-RL7 概覽
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 ADA4805-2 is a voltage feedback amplifier, a type of op amp that uses a voltage-controlled voltage source topology, providing high bandwidth and low distortion. It belongs to the family of linear integrated circuits, specifically analog signal processing components, which are fundamental building blocks in electronic systems.
Key features include a 105 MHz bandwidth, a slew rate of 225 V/µs, and a low input voltage noise of 7.5 nV/√Hz. The rail-to-rail output stage allows maximum output swing, while the low quiescent current extends battery life in portable applications. The device also features a low offset voltage of 0.2 µV/°C drift, ensuring accuracy over temperature.
The ADA4805-2 utilizes a complementary bipolar process, achieving high speed and low power simultaneously. The amplifier's architecture provides stable operation with capacitive loads, and its wide supply range accommodates various system rails. The low noise and distortion make it suitable for high resolution data conversion systems, where signal integrity is critical.
Typical applications include portable instrumentation, battery-powered equipment, active filters, and analog-to-digital converter (ADC) drivers. The low power consumption and high bandwidth make it ideal for multi-channel systems where power dissipation is a concern. The rail-to-rail output ensures full-scale signal swing, maximizing dynamic range.
When designing with this amplifier, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device. The input common-mode range extends to the rails, but for best performance, keep inputs within the specified range. The output can drive capacitive loads up to 100 pF without oscillation, but for larger loads, add a series resistor.
直接替換替代品，適用於 ADA4805-2ARMZ-RL7 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADA4805-2ARMZ-RL7 （相同外形與佔位） — 差異在於 Slew Rate, Supply Voltage Range, Input Offset Voltage, Package, Amplifier Type.
ADA4805-2ARMZ-R7
✅ 直接替換📋 參考替代品（不在目錄中）
ADA4805-2ARMZ
✅ 直接替換聯絡詢價
查看資料表 →ADA4666-2ARMZ-RL7
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADA4661-2ARMZ-RL7
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADA4528-2ARMZ-RL7
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADA4805-2ARMZ-RL7 最大額定值與電氣特性
| Number of Channels | 2 |
| Amplifier Type | Voltage Feedback |
| 輸出類型 | Rail-to-Rail |
| Supply Voltage Range (Dual) | ±1.5 V to ±5 V |
| Supply Voltage Range (Single) | 3 V to 5 V |
| Quiescent Current per Amplifier | 500 µA |
| Bandwidth (-3 dB) | 105 MHz |
| Slew Rate | 225 V/µs |
| Input Voltage Noise Density | 7.5 nV/√Hz |
| Offset Voltage Drift | 0.2 µV/°C |
| Output Current | 85 mA |
| 封裝 | 8-MSOP |
| 工作溫度範圍 | -40°C to +125°C |
| RoHS 狀態 | Compliant |
| 安裝類型 | Surface Mount |
ADA4805-2ARMZ-RL7 腳位配置
| 腳位 1 | OUT A — Output of amplifier A |
| 腳位 2 | -IN A — Inverting input of amplifier A |
| 腳位 3 | +IN A — Non-inverting input of amplifier A |
| 腳位 4 | V- — Negative supply voltage |
| 腳位 5 | +IN B — Non-inverting input of amplifier B |
| 腳位 6 | -IN B — Inverting input of amplifier B |
| 腳位 7 | OUT B — Output of amplifier B |
| 腳位 8 | V+ — Positive supply voltage |
典型應用
ADA4805-2ARMZ-RL7 適用於 6 應用s: Portable Instrumentation, ADC Driver, Active Filters, Battery-Powered Equipment, High-Speed Signal Conditioning, Medical Devices.
Portable Instrumentation
The ADA4805-2ARMZ-RL7's low quiescent current of 500 µA per amplifier and wide supply range from ±1.5 V to ±5 V make it ideal for battery-powered instruments. Its 105 MHz bandwidth ensures accurate signal conditioning in portable multimeters and data loggers. The rail-to-rail output maximizes dynamic range, while the low noise of 7.5 nV/√Hz preserves signal integrity in precision measurements. Designers can use it in active filters and buffer stages, benefiting from its low power consumption to extend battery life.
推薦
ADC Driver
The ADA4805-2ARMZ-RL7 is well-suited for driving high-resolution ADCs due to its low noise and high bandwidth. Its 105 MHz bandwidth and 225 V/µs slew rate allow it to settle quickly for sampling rates up to several MSPS. The rail-to-rail output ensures full-scale input to the ADC, maximizing dynamic range. The low quiescent current is beneficial in multi-channel systems where multiple drivers are used. The amplifier's low distortion preserves signal fidelity, making it ideal for precision data acquisition systems.
推薦
Active Filters
The ADA4805-2ARMZ-RL7's high bandwidth and low power make it an excellent choice for active filters in portable devices. Its 105 MHz bandwidth allows implementation of filters up to 10 MHz with good accuracy. The low quiescent current of 500 µA is ideal for battery-powered filters. The rail-to-rail output enables maximum signal swing, and the low noise ensures clean filtering. Designers can use it in Sallen-Key or multiple feedback topologies for anti-aliasing or reconstruction filters.
推薦
Battery-Powered Equipment
The ADA4805-2ARMZ-RL7 is optimized for battery-powered equipment due to its low quiescent current of 500 µA per amplifier. It operates from a single 3 V or 5 V supply, making it compatible with common battery voltages. The rail-to-rail output allows full use of the supply range, and the low noise ensures accurate signal processing. Its small 8-MSOP package saves board space, and the wide temperature range of -40°C to +125°C suits harsh environments. Applications include portable medical devices, handheld meters, and wireless sensors.
推薦
High-Speed Signal Conditioning
The ADA4805-2ARMZ-RL7's 105 MHz bandwidth and 225 V/µs slew rate make it suitable for high-speed signal conditioning in video and communication systems. It can buffer and amplify signals up to 10 MHz with minimal distortion. The low quiescent current is advantageous in multi-channel systems, and the rail-to-rail output provides maximum headroom. The amplifier's low noise of 7.5 nV/√Hz ensures signal integrity in sensitive paths. It is ideal for driving cables, filters, and ADCs in high-speed data acquisition.
推薦
Medical Devices
The ADA4805-2ARMZ-RL7 is suitable for medical devices such as patient monitors and diagnostic equipment due to its low power and low noise. Its 500 µA quiescent current extends battery life in portable monitors, and the low noise of 7.5 nV/√Hz ensures accurate biopotential measurements. The wide supply range accommodates various battery configurations, and the rail-to-rail output maximizes signal range. The small MSOP package is ideal for compact medical devices. The device's reliability over -40°C to +125°C ensures consistent performance.
推薦
推薦產品摘要
工程參考資料，適用於 ADA4805-2ARMZ-RL7 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADA4805-2ARMZ-R7 | ADA4805-2ARMZ | ADA4666-2ARMZ-RL7 | ADA4661-2ARMZ-RL7 | ADA4528-2ARMZ-RL7 |
|---|---|---|---|---|---|---|
| Package | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Bandwidth | 105 MHz | 105 MHz | 105 MHz | 4 MHz | 18 MHz | 6.5 MHz |
| Quiescent Current per Amplifier | 500 µA | 500 µA | 500 µA | 1.2 mA | 1.2 mA | 1.5 mA |
| Slew Rate | 225 V/µs | 225 V/µs | 225 V/µs | 1.2 V/µs | 10 V/µs | 5 V/µs |
| Input Voltage Noise Density | 7.5 nV/√Hz | 7.5 nV/√Hz | 7.5 nV/√Hz | 12 nV/√Hz | 10 nV/√Hz | 5.8 nV/√Hz |
| Offset Voltage Drift | 0.2 µV/°C | 0.2 µV/°C | 0.2 µV/°C | 0.5 µV/°C | 0.5 µV/°C | 0.015 µV/°C |
| Output Current | 85 mA | 85 mA | 85 mA | 30 mA | 30 mA | 50 mA |
主要差異化特點
- Lowest quiescent current in its bandwidth class (對比ADA4666-2ARMZ-RL7)
- Higher bandwidth than pin-compatible alternatives (對比ADA4661-2ARMZ-RL7)
- Higher output current capability (對比ADA4528-2ARMZ-RL7)
設計說明
The ADA4805-2ARMZ-RL7 operates from ±1.5 V to ±5 V dual supplies or 3 V to 5 V single supply. Ensure the supply voltage is within the specified range to avoid damage. Use 0.1 µF ceramic capacitors close to the V+ and V- pins for decoupling. For single-supply operation, connect V- to ground and ensure the input common-mode range is respected.
For optimal performance, place the ADA4805-2ARMZ-RL7 on a PCB with a solid ground plane. Keep traces short and direct, especially for high-frequency signals. Use surface-mount components to minimize parasitic inductance. The MSOP package has a thermal pad; solder it to a copper pour for better heat dissipation, though power dissipation is low.
Avoid driving capacitive loads greater than 100 pF directly, as this may cause oscillation. If larger loads are required, add a series resistor (e.g., 50 Ω) at the output. Also, ensure the input signals do not exceed the supply rails, as this can cause phase reversal. The ADA4805-2 is not a rail-to-rail input, so keep inputs within the common-mode range.
合規資訊
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification indicated.
