Overview
The AD8332ARUZ-RL, 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 can be used as a low noise variable gain element at frequencies up to 120 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. The AD8332 is available in a 28-lead TSSOP package and is part of a family that includes single-channel (AD8331) and quad-channel (AD8334) versions.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 2 (Dual) |
| Gain Range | -4.5 dB to +43.5 dB (LO gain mode), 7.5 dB to 55.5 dB (HI gain mode) |
| Input Voltage Noise | 0.82 nV/√Hz (RS = 0 Ω, HI or LO gain, RIZ = ∞, f = 5 MHz) |
| Input Current Noise | 2.5 pA/√Hz (RIZ = ∞, HI or LO gain, f = 5 MHz) |
| Bandwidth | 100 MHz (-3 dB small signal bandwidth) |
| Slew Rate | 275 V/µs (LO gain), 1100 V/µs (HI gain) |
| Input Resistance | 280 Ω (50 Ω RIZ), adjustable |
| Output Impedance | 5 Ω (single-ended) |
| Supply Voltage | Single 5 V supply |
| Operating Temperature Range | -40°C to +85°C |
| Package Type | 28-lead TSSOP |
Key Features
- Ultralow noise preamplifier (LNA) with adjustable input impedance matching
- X-AMP® VGA with 48 dB gain range and linear-in-dB gain control
- Selectable gain postamplifier with adjustable output limiting
- Excellent bandwidth uniformity across the entire gain range
- Differential signal paths for low crosstalk and superb distortion performance
- Single 5 V supply operation
- Available in 28-lead TSSOP and 32-lead LFCSP packages
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 gain range of the AD8332?
The AD8332 has a gain range of -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 input voltage noise of the AD8332?
The typical input voltage noise is 0.82 nV/√Hz (RS = 0 Ω, HI or LO gain, RIZ = ∞, f = 5 MHz).
- What is the bandwidth of the AD8332?
The -3 dB small signal bandwidth is 100 MHz.
- What is the slew rate of the AD8332?
The slew rate is 275 V/µs in LO gain mode and 1100 V/µs in HI gain mode.
- What is the operating temperature range of the AD8332?
The operating temperature range is -40°C to +85°C.
- In what package types is the AD8332 available?
The AD8332 is available in 28-lead TSSOP and 32-lead LFCSP packages.
- What are the primary applications of the AD8332?
The primary applications include ultrasound and sonar time-gain controls, high performance AGC systems, I/Q signal processing, and high speed, dual ADC drivers.
- How does the AD8332 achieve input impedance matching?
The AD8332 allows for adjustable input impedance matching using a single resistor without compromising noise performance.
- What is the supply voltage requirement for the AD8332?
The AD8332 operates on a single 5 V supply.
- What are the key benefits of the differential signal paths in the AD8332?
The differential signal paths result in low crosstalk and superb second- and third-order distortion performance.
