Analog Devices Inc. ADA4805-1 低功耗、低噪声、轨到轨放大器
亚德诺半导体 ADA4805-1 低功耗、低噪声、轨到轨放大器是高速电压反馈型轨到轨输出放大器，具有 495μA 的超低静态电流。尽管功耗很低，但该放大器仍具有出色的整体性能。该器件具有 105MHz 的高带宽（增益为 1）、160 V/μs 的高压摆率以及最大为 125μV 的低输入失调电压。ADA4805-1 关断引脚允许进一步将静态电源电流降低至 3μA。对于功率敏感型应用而言，关断模式可提供从关断到完全开启达 3μs 的极高速开启时间（输出为 16 位）。这样，用户便可在两次模数转换器采样之间关断放大器，实现动态功耗管理。这款放大器采用 ADI 公司专有的超快速互补双极性(XFCB)工艺制造，同时具备低电压和低电流噪声性能（5.9 nV/√Hz，0.6 pA/√Hz）。ADA4805-1 支持从±1.5V 到 ±5V 的宽幅电源电压范围、以及 3V 和 5V 单电源，因此特别适合高速、低功耗、高分辨率数据转换系统，如电池供电仪器仪表、微功耗有源滤波器、便携式 POS 机终端、有源 RFID 读取器、光电倍增管、模数转换器基准电压源缓冲器、以及高分辨率、高精度模数转换器驱动器。
The ADI ADA4805-1 shutdown pin allows further reduction of the quiescent supply current to 3μA. For power sensitive applications, the shutdown mode offers very fast turn-on time of 3μs from shutdown to fully on (output settled to 16bits). This allows the designers to dynamically manage the power of the amplifier by turning the amplifier off between ADC samples.
With ADI's proprietary extra fast complementary bipolar (XFCB) process, ADA4805-1 enables both low voltage and low current noise (5.9nV/√Hz, 0.6pA/√Hz). Operating over a wide range of supply voltages from ±1.5V to ±5V, as well as from single 3V and 5V supplies, ADA4805-1 is ideal for high speed, low power, high resolution data conversion systems such as battery-powered instrumentation, micropower active filters, portable point-of-sales terminals, active RFID readers, photomultipliers, ADC reference buffers, and high resolution, high precision ADC drivers.
Evaluation board ADA4805-1ARJZEBZ is designed to help designers evaluate high speed op amps and quickly prototype new op amp circuits and reduce design time.
特性
- 125μV (maximum) Low input offset voltage
- Low input offset voltage drift:
- -0.2μV/°C (typical)
- -1.5μV/°C (maximum)
- 495μA/amplifier Ultralow supply current
- 3V to 10V Wide supply voltage range
- High speed performance:
- 105MHz -3dB bandwidth
- 160V/μs Slew rate
- 35ns 0.1% settling time
- Rail-to-rail outputs
- -VS -0.1V to +VS -1V Input common-mode range
- 5.9nV/√Hz at 100kHz; 0.6pA/√Hz at 100kHz Low noise
- -102dBc/-116dBc HD2/HD3 at 100kHz Low distortion
- 470nA (typical) Low input bias current
- 3μs (maximum) Fully settled high speed turn-on time
- 6-lead SC70, 6-lead SOT-23 Small packaging
应用
- High resolution, high precision analog-to-digital converter (ADC) drivers
- Battery-powered instrumentation
- Micropower active filters
- Portable point of sales terminals
- Active RFID readers
- Photo multipliers
- ADC reference buffers
视频
Additional Resources
Can You Really Get ppm Accuracies from Op Amps?
There is a march toward 1 ppm accurate systems, especially now that 1 ppm linear ADCs are becoming common. This article presents op amp accuracy limitations and how to choose the few op amps that have a chance of 1 ppm accuracy.