Overview
The AD8332ARU, produced by Analog Devices Inc., is a dual-channel, ultralow noise, linear-in-dB variable gain amplifier (VGA). This device is optimized for ultrasound systems and is suitable for use as a low noise variable gain element at frequencies up to 100 MHz. Each channel 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 | Min | Typ | Max | Unit |
|---|---|---|---|---|
| 3 dB Bandwidth | 100 | MHz | ||
| Power Consumption per Channel | 145 | mW | ||
| Gain Range (LO gain mode) | -4.5 | +43.5 | dB | |
| Gain Range (HI gain mode) | 7.5 | +55.5 | dB | |
| Input Voltage Noise | 0.82 | nV/√Hz | ||
| Output-Referred Noise (LO gain) | 40 | nV/√Hz | ||
| Output-Referred Noise (HI gain) | 150 | nV/√Hz | ||
| Slew Rate (LO gain) | 275 | V/µs | ||
| Slew Rate (HI gain) | 1100 | V/µs | ||
| Operating Supply Voltage | 5 | V | ||
| Operating Temperature Range | -40 | +85 | °C |
Key Features
- Ultralow noise preamplifier with voltage noise of 0.74 nV/√Hz and current noise of 2.5 pA/√Hz
- Wide gain range with programmable postamplifier: -4.5 dB to +43.5 dB in LO gain mode and 7.5 dB to 55.5 dB in HI gain mode
- Low output-referred noise: 40 nV/√Hz typical in LO gain mode and 150 nV/√Hz in HI gain mode
- Active input impedance matching and selectable output clamping level
- Single 5 V supply operation and excellent part-to-part and channel-to-channel gain matching
- 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
- Precision analog-to-digital conversions in test equipment and instrumentation
Q & A
- What is the AD8332ARU?
The AD8332ARU is a dual-channel, ultralow noise, linear-in-dB variable gain amplifier (VGA) produced by Analog Devices Inc.
- What is the gain range of the AD8332ARU?
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 typical output-referred noise of the AD8332ARU?
The typical output-referred noise is 40 nV/√Hz in LO gain mode and 150 nV/√Hz in HI gain mode.
- What is the operating supply voltage of the AD8332ARU?
The operating supply voltage is 5 V.
- What are the typical applications of the AD8332ARU?
The AD8332ARU is used in ultrasound and sonar time-gain controls, high performance AGC systems, I/Q signal processing, and high speed, dual ADC drivers.
- What is the bandwidth of the AD8332ARU?
The 3 dB bandwidth is 100 MHz.
- How does the AD8332ARU achieve input impedance matching?
The AD8332ARU achieves active input impedance matching, and the LNA input impedance can be adjusted using a single resistor.
- What are the package options for the AD8332ARU?
The AD8332ARU is available in 28-lead TSSOP and 32-lead LFCSP packages.
- What is the operating temperature range of the AD8332ARU?
The operating temperature range is -40°C to +85°C.
- Does the AD8332ARU support differential signal paths?
Yes, the AD8332ARU supports differential signal paths, which result in superb second- and third-order distortion performance and low crosstalk.
