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概览
优势和特点
- Fully specified dual power mode operation
- 4 mA full power mode (145 MHz)
- 1.4 mA low power mode (80 MHz)
- Full power mode
- Low harmonic distortion
- −120 dB THD at 1 kHz
- −110 dB THD at 100 kHz
- Fast settling time
- 18-bit: 100 ns
- 16-bit: 50 ns
- Input voltage noise: 1.6 nV/√Hz, f = 100 kHz
- Low harmonic distortion
- ±100 µV maximum offset voltage from −40°C to +125°C
- Rail-to-rail output
- Wide input common-mode voltage range: −VS to +VS − 1.3 V
- Broad power supplies: 3 V to 10 V
- Adjustable output clamps for ADC input protection
产品详情
The ADA4945-1 is a low noise, low distortion, fully differential amplifier with two selectable power modes. It is an ideal choice for driving high resolution, high performance SAR and Σ-Δ analog-to-digital converters (ADCs) on 4 mA of quiescent current (full power mode) and can be selected to operate on 1.4 mA of quiescent current (low power mode) to scale the power consumption to the desired performance necessary for the ADC drive application. The adjustable common-mode voltage allows the ADA4945-1 to match the input common-mode voltage of multiple ADCs. The internal common-mode feedback loop provides exceptional output balance, as well as suppression of even order harmonic distortion products.
With the ADA4945-1, differential gain configurations are realized with a simple external feedback network of four resistors determining the closed-loop gain of the amplifier. The ADA4945-1 is fabricated using Analog Devices, Inc., proprietary, silicon germanium (SiGe), complementary bipolar process, enabling the device to achieve low levels of distortion with an input voltage noise of only 1.6 nV/√Hz (full power mode).
The low dc offset, dc offset drift, and excellent dynamic performance of the ADA4945-1 makes it well suited for a variety of data acquisition and signal processing applications.
The ADA4945-1 is available in a RoHS-complaint, 3 mm × 3 mm, 16-lead LFCSP. The ADA4945-1 is specified to operate over the –40°C to + 125°C temperature range.
Applications
- Low power Σ-Δ, PulSAR®/SAR ADC drivers
- Single-ended to differential conversion
- Differential buffers
- Medical imaging
- Industrial process controls
- Portable electronics
产品生命周期
预发布
本产品为新品，工程验证可能仍在进行中。我们正在准备量产，数量可能有限，设计规格可能会改变。
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工具及仿真模型
Precision ADC Driver Tool - BETA
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
设计资源
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