Overview
The AD605BRZ-RL, produced by Analog Devices Inc., is a dual, low noise, single-supply variable gain amplifier (VGA). This component is optimized for applications requiring high performance, wide bandwidth, and variable gain control. The AD605 features differential inputs and unipolar gain control, making it versatile and easy to use. It operates from a single 5 V supply and is available in a 16-lead SOIC_N package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain Range | −14 | +34 / 0 to +48 | dB | |
| Input Noise Spectral Density | 1.8 | nV/√Hz | ||
| Input Voltage Range | ±2.0 | V | ||
| Input Resistance | 2 | MΩ | ||
| Supply Voltage | 4.5 | 5.0 | 5.5 | V |
| Quiescent Supply Current | 18 | 23 | mA | |
| Operating Temperature Range | −40 | +85 | °C | |
| Power Dissipation | 90 | mW | ||
| Response Time (48 dB gain change) | 0.2 | μs |
Key Features
- Dual, low noise, single-supply variable gain amplifier (VGA)
- Differential inputs and unipolar gain control
- User-determined gain range and external reference input for gain scaling (dB/V)
- High performance linear-in-dB response using DSX-AMP architecture
- Variable attenuator of 0 dB to −48.4 dB followed by a high speed, fixed-gain amplifier
- 7-stage R-1.5R ladder network with 6.908 dB attenuation between tap points
- Gain scales linearly in dB with control voltages of 0.4 V to 2.4 V for the 20 dB/V scale
- Power-down feature when VGN is < 50 mV, drawing 1.9 mA
Applications
The AD605 is suitable for various applications requiring high performance, wide bandwidth, and variable gain control. These include:
- Audio and video signal processing
- Medical imaging and diagnostic equipment
- Industrial control and automation systems
- Communication systems requiring dynamic gain adjustment
- Any application needing precise, linear-in-dB gain control
Q & A
- What is the gain range of the AD605?
The AD605 provides a gain range of −14 dB to +34 dB and 0 dB to +48 dB, depending on the configuration of the feedback resistor.
- What is the input noise spectral density of the AD605?
The input noise spectral density is 1.8 nV/√Hz.
- What is the operating temperature range of the AD605?
The AD605 operates over a temperature range of −40°C to +85°C.
- How does the gain control interface work?
The gain control interface allows for linear-in-dB gain scaling with control voltages of 0.4 V to 2.4 V for the 20 dB/V scale.
- What packages is the AD605 available in?
The AD605 is available in 16-lead PDIP and 16-lead SOIC_N packages.
- Can the AD605 be powered down?
Yes, the AD605 can be powered down to draw 1.9 mA when the gain control voltage (VGN) is less than 50 mV.
- What is the response time for a 48 dB gain change?
The response time for a 48 dB gain change is 0.2 μs.
- How does the DSX-AMP architecture contribute to the performance of the AD605?
The DSX-AMP architecture provides high performance linear-in-dB response using a variable attenuator followed by a high speed, fixed-gain amplifier.
- Can the two channels of the AD605 be cascaded?
Yes, the two channels of the AD605 can be cascaded to provide up to 96 dB of gain range.
- What is the quiescent supply current of the AD605?
The quiescent supply current is 18 mA to 23 mA.
