Overview
The AD8331ARQ-REEL, produced by Analog Devices Inc., is a single-channel, ultralow noise, linear-in-dB variable gain amplifier (VGA) with a preamplifier and programmable input impedance. This device is optimized for applications requiring high performance and low noise, particularly in ultrasound systems and other high-frequency applications. It features a single 5 V supply operation and is packaged in a 20-lead QSOP (Quad Flat Small Outline Package).
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 20-lead QSOP |
| Supply Voltage | Single 5 V |
| 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) |
| Bandwidth | 120 MHz (3 dB small signal bandwidth) |
| Input Voltage Noise | 0.74 nV/√Hz |
| Output-Referred Noise | 48 nV/√Hz (typical) |
| Operating Temperature Range | -40°C to +85°C |
| Slew Rate | 300 V/µs (LO gain), 1200 V/µs (HI gain) |
Key Features
- Ultralow noise preamplifier with voltage noise of 0.74 nV/√Hz and current noise of 2.5 pA/√Hz.
- Programmable input impedance and active input impedance matching.
- Wide gain range with selectable postamplifier gain (3.5 dB or 15.5 dB).
- Low output-referred noise, making it suitable for driving high-speed differential ADCs.
- Selectable output clamping level to prevent input overload to subsequent ADCs.
- Differential signal paths for superb second- and third-order distortion performance and low crosstalk.
Applications
- Ultrasound and sonar time-gain controls.
- High-performance automatic gain control (AGC) systems.
- I/Q signal processing.
- High-speed, dual ADC drivers.
Q & A
- What is the AD8331ARQ-REEL used for? The AD8331ARQ-REEL is used in applications requiring high performance and low noise, such as ultrasound systems, AGC systems, and I/Q signal processing.
- What is the package type of the AD8331ARQ-REEL? The AD8331ARQ-REEL is packaged in a 20-lead QSOP (Quad Flat Small Outline Package).
- What is the supply voltage of the AD8331ARQ-REEL? The AD8331ARQ-REEL operates on a single 5 V supply.
- What is the gain range of the AD8331ARQ-REEL? The gain range is -4.5 dB to +43.5 dB in LO gain mode and 7.5 dB to 55.5 dB in HI gain mode.
- What is the bandwidth of the AD8331ARQ-REEL? The 3 dB small signal bandwidth is 120 MHz.
- What is the input voltage noise of the AD8331ARQ-REEL? The input voltage noise is 0.74 nV/√Hz.
- What is the output-referred noise of the AD8331ARQ-REEL? The output-referred noise is typically 48 nV/√Hz.
- What is the operating temperature range of the AD8331ARQ-REEL? The operating temperature range is -40°C to +85°C.
- Can the AD8331ARQ-REEL be used in high-speed ADC applications? Yes, it is suitable for driving high-speed differential ADCs due to its low output-referred noise).
- How can the output clamping level be adjusted on the AD8331ARQ-REEL? The output clamping level can be adjusted using an external resistor).
