Overview
The AD604ARZ-RL, produced by Analog Devices Inc., is a dual, ultralow noise variable gain amplifier (VGA) optimized for time-based variable gain control, particularly in ultrasound applications. However, it is versatile and supports any application requiring low noise, wide bandwidth, and variable gain control. Each channel of the AD604 provides a high-performance preamplifier with an input-referred noise voltage of 0.8 nV/√Hz and a 300 kΩ input resistance. The amplifier features unipolar gain control and user-determined gain ranges, gain scaling, and dc level shifting of the output to optimize performance.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | ±6.5 V |
| Input Resistance | 300 kΩ |
| Gain Range | 0 dB to 48 dB, 6 dB to 54 dB |
| Gain Scaling | Up to 40 dB/V (accurate up to 30 dB/V) |
| Input-Referred Noise Voltage | 0.8 nV/√Hz |
| Operating Temperature Range | −40°C to +85°C |
| Storage Temperature Range | −65°C to +150°C |
| Package Types | 24-Lead SOIC (Wide), 24-Lead SSOP, PDIP |
| Power Dissipation | 220 mW (one complete channel), 95 mW (one DSX only) |
| Quiescent Supply Current | 32-36 mA (VPOS, one complete channel), -15 to -12 mA (VNEG, one preamplifier only) |
Key Features
- Ultralow noise with an input-referred noise voltage of 0.8 nV/√Hz.
- Dual-channel, linear-in-dB variable gain amplifier.
- High-performance preamplifier with gain ranges of 0 dB to 48 dB and 6 dB to 54 dB.
- Unipolar gain control and user-determined gain scaling (up to 40 dB/V).
- Differential input exponential amplifier (DSX-AMP) architecture with a 7-stage R-1.5R ladder network attenuator.
- Access to the output of the preamplifier for external filtering.
- Power-down feature with low current consumption when VGN < 50 mV.
Applications
The AD604ARZ-RL is primarily optimized for time-based variable gain control in ultrasound applications. However, its low noise, wide bandwidth, and variable gain control capabilities make it suitable for a variety of other applications, including:
- Medical imaging and diagnostics.
- Industrial and scientific instrumentation.
- Aerospace and defense systems.
- High-performance audio and video systems.
Q & A
- What is the primary application of the AD604ARZ-RL? The AD604ARZ-RL is primarily optimized for time-based variable gain control in ultrasound applications.
- What is the input-referred noise voltage of the AD604ARZ-RL? The input-referred noise voltage is 0.8 nV/√Hz.
- What are the gain ranges provided by the AD604ARZ-RL? The gain ranges are 0 dB to 48 dB and 6 dB to 54 dB.
- What is the gain scaling capability of the AD604ARZ-RL? The gain scaling is up to 40 dB/V, with accurate scaling up to 30 dB/V.
- What are the package types available for the AD604ARZ-RL? The available package types are 24-Lead SOIC (Wide), 24-Lead SSOP, and PDIP.
- How does the power-down feature work? The amplifier channel is powered down when the gain control voltage (VGN) is less than 50 mV, reducing current consumption to 1.9 mA.
- What is the operating temperature range of the AD604ARZ-RL? The operating temperature range is −40°C to +85°C.
- Can the channels of the AD604ARZ-RL be cascaded? Yes, the channels can be cascaded to provide greater levels of gain range by bypassing the preamplifier of the second channel.
- What is the differential input exponential amplifier (DSX-AMP) architecture? The DSX-AMP architecture includes a variable attenuator followed by a high-speed fixed-gain amplifier, using a 7-stage R-1.5R ladder network.
- Is external filtering possible between the preamplifier and the differential attenuator stage? Yes, the AD604ARZ-RL provides access to the output of the preamplifier for external filtering.
