Overview
The AD8331ARQZ is a single-channel, ultralow noise, linear-in-dB, variable gain amplifier (VGA) produced by Analog Devices Inc. This device is optimized for ultrasound systems and can be used as a low noise variable gain element at frequencies up to 120 MHz. It includes an ultralow noise preamplifier (LNA), an X-AMP® VGA with a 48 dB gain range, and a selectable gain postamplifier with adjustable output limiting.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 1 | |
| Gain Range (LO gain mode) | -4.5 to +43.5 dB | |
| Gain Range (HI gain mode) | 7.5 to 55.5 dB | |
| Input Voltage Noise | 0.82 nV/√Hz (typical at 5 MHz) | |
| Bandwidth (small signal, -3 dB) | 120 MHz | |
| Bandwidth (large signal, -3 dB, VOUT = 2 V p-p) | 110 MHz | |
| Slew Rate (LO gain) | 300 V/µs | |
| Slew Rate (HI gain) | 1200 V/µs | |
| Supply Voltage Range | 4.5 V to 5.5 V | |
| Operating Temperature Range | -40°C to +85°C | |
| Package Type | 20-lead QSOP |
Key Features
- Ultralow noise preamplifier (LNA) with adjustable input impedance matching.
- X-AMP® VGA with 48 dB gain range and linear-in-dB scaling.
- Selectable gain postamplifier with adjustable output limiting.
- Excellent bandwidth uniformity across the entire gain range.
- Differential signal paths for low crosstalk and excellent second- and third-order distortion performance.
- Single 5 V supply operation.
- Optimized for 10-bit/12-bit ADCs.
- Factory trim ensures excellent part-to-part and channel-to-channel gain matching.
Applications
- Ultrasound and sonar time-gain controls.
- High performance automatic gain control (AGC) systems.
- I/Q signal processing.
- High speed, dual ADC drivers.
- Signal processing in various high-frequency applications.
Q & A
- What is the gain range of the AD8331ARQZ in LO gain mode?
The gain range in LO gain mode is from -4.5 dB to +43.5 dB.
- What is the maximum bandwidth of the AD8331ARQZ?
The maximum bandwidth is 120 MHz for small signal, -3 dB.
- What is the typical input voltage noise of the AD8331ARQZ?
The typical input voltage noise is 0.82 nV/√Hz at 5 MHz.
- What is the operating temperature range of the AD8331ARQZ?
The operating temperature range is -40°C to +85°C.
- What type of package is the AD8331ARQZ available in?
The AD8331ARQZ is available in a 20-lead QSOP package.
- What are the key applications of the AD8331ARQZ?
The key applications include ultrasound and sonar time-gain controls, high performance AGC systems, I/Q signal processing, and high speed ADC drivers.
- How does the gain control interface work?
The gain control interface provides precise linear-in-dB scaling of 50 dB/V for control voltages between 0 and 1 V.
- What is the slew rate of the AD8331ARQZ in HI gain mode?
The slew rate in HI gain mode is 1200 V/µs.
- Is the AD8331ARQZ optimized for ADCs?
Yes, it is optimized for 10-bit/12-bit ADCs.
- What is the supply voltage range for the AD8331ARQZ?
The supply voltage range is from 4.5 V to 5.5 V.
