Overview
The AD8331ARQ-REEL7, produced by Analog Devices Inc., is a single-channel, ultralow noise linear-in-dB variable gain amplifier (VGA). This device is part of the AD8331/AD8332/AD8334 family, optimized for ultrasound systems but versatile enough for various applications requiring low noise variable gain control up to 120 MHz.
The AD8331 includes an ultralow noise preamplifier (LNA), an X-AMP® VGA with a wide gain range, and a selectable gain postamplifier. It is designed to provide excellent bandwidth uniformity and low distortion, making it suitable for high-performance automatic gain control (AGC) systems, I/Q signal processing, and high-speed ADC drivers.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | Single-channel |
| 3 dB Bandwidth | 120 MHz |
| Power Consumption | 125 mW/channel |
| Gain Range | −4.5 dB to +43.5 dB (LO gain mode), 7.5 dB to 55.5 dB (HI gain mode) |
| Output-Referred Noise | 48 nV/√Hz typical |
| Input Voltage Noise | 0.74 nV/√Hz |
| Input Current Noise | 2.5 pA/√Hz |
| Supply Voltage | Single 5 V supply |
| Operating Temperature Range | −40°C to +85°C |
| Package Type | 20-lead QSOP |
Key Features
- Ultralow Noise Preamplifier: Voltage noise of 0.74 nV/√Hz and current noise of 2.5 pA/√Hz.
- Wide Gain Range: Programmable gain from −4.5 dB to +43.5 dB in LO gain mode and 7.5 dB to 55.5 dB in HI gain mode.
- Low Power Consumption: 125 mW/channel.
- High Bandwidth: 3 dB bandwidth of 120 MHz.
- Active Input Impedance Matching: Adjustable input impedance to match signal sources.
- Selectable Output Clamping Level: Prevents input overload to subsequent ADCs.
- Differential Signal Paths: Excellent second- and third-order distortion performance and low crosstalk.
Applications
- Ultrasound and Sonar Time-Gain Controls: Optimized for ultrasound systems but applicable to sonar systems as well.
- High Performance Automatic Gain Control (AGC) Systems: Suitable for systems requiring precise gain control.
- I/Q Signal Processing: Used in various signal processing applications.
- High Speed ADC Drivers: Drives high speed differential ADCs with low noise.
Q & A
- What is the primary application of the AD8331ARQ-REEL7?
The AD8331ARQ-REEL7 is primarily optimized for ultrasound systems but can be used in various applications requiring low noise variable gain control.
- What is the 3 dB bandwidth of the AD8331ARQ-REEL7?
The 3 dB bandwidth of the AD8331ARQ-REEL7 is 120 MHz.
- What is the power consumption of the AD8331ARQ-REEL7 per channel?
The power consumption is 125 mW per channel.
- What is the gain range of the AD8331ARQ-REEL7?
The gain range is from −4.5 dB to +43.5 dB in LO gain mode and from 7.5 dB to 55.5 dB in HI gain mode.
- What is the output-referred noise of the AD8331ARQ-REEL7?
The output-referred noise is 48 nV/√Hz typical.
- What is the input voltage noise of the AD8331ARQ-REEL7?
The input voltage noise is 0.74 nV/√Hz.
- Can the AD8331ARQ-REEL7 be used with high speed ADCs?
- What is the operating temperature range of the AD8331ARQ-REEL7?
The operating temperature range is −40°C to +85°C.
- In what package type is the AD8331ARQ-REEL7 available?
- Does the AD8331ARQ-REEL7 support active input impedance matching?
