Overview
The AD605AR-REEL, 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 and wide bandwidth variable gain control. It operates from a single 5 V supply and features differential inputs and unipolar gain control, making it easy to use and highly flexible. The AD605 utilizes a differential input, single-supply, exponential amplifier (DSX-AMP) architecture, which includes a variable attenuator followed by a high-speed, fixed-gain amplifier. This architecture ensures a high-performance linear-in-dB response and low noise spectral density of 1.8 nV/√Hz.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 4.5 to 5.5 | V |
| Power Dissipation | 90 | mW |
| Quiescent Supply Current (VPOS) | 18 to 23 | mA |
| Power-Down Current (VPOS, VGN < 50 mV) | 1.9 to 3.0 | mA |
| Input Noise Spectral Density | 1.8 | nV/√Hz |
| Input Resistance | 2 | MΩ |
| Response Time (48 dB gain change) | 0.2 | μs |
| Operating Temperature Range | -40°C to +85°C | |
| Storage Temperature Range | -65°C to +150°C | |
| Gain Range per Channel | -14 dB to +34 dB or 0 dB to +48 dB | |
| Maximum Gain Range (cascaded channels) | 96 dB |
Key Features
- Dual-channel, 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 (0 dB to -48.4 dB) followed by a high-speed, fixed-gain amplifier
- Gain control interface with input resistance of approximately 2 MΩ and scale factors from 20 dB/V to 30 dB/V
- Power-down feature to reduce current draw to 1.9 mA when VGN is < 50 mV
- Available in 16-lead PDIP and 16-lead SOIC_N packages
Applications
The AD605 is suitable for various applications requiring high-performance, wide bandwidth variable gain control. These include:
- Audio and video signal processing
- Medical imaging and diagnostics
- Industrial control and automation
- Telecommunications and RF systems
- Test and measurement equipment
Q & A
- What is the supply voltage range for the AD605?
The AD605 operates from a single supply voltage of 4.5 V to 5.5 V.
- What is the input noise spectral density of the AD605?
The input noise spectral density is 1.8 nV/√Hz.
- How is the gain range of the AD605 controlled?
The gain range can be controlled by a single resistor between Pin FBK and Pin OUT, allowing for gain ranges between -14 dB to +34 dB or 0 dB to +48 dB.
- What is the maximum gain range achievable by cascading the channels of the AD605?
The maximum gain range achievable by cascading the channels is 96 dB.
- What are the package options for the AD605?
The AD605 is available in 16-lead PDIP and 16-lead SOIC_N packages.
- What is the operating temperature range of the AD605?
The operating temperature range is -40°C to +85°C.
- How does the power-down feature work on the AD605?
The amplifier powers down to draw 1.9 mA when the gain control voltage (VGN) is less than 50 mV.
- What is the quiescent supply current of each amplifier channel?
The quiescent supply current of each amplifier channel is 18 mA under normal operation.
- What is the response time for a 48 dB gain change?
The response time for a 48 dB gain change is 0.2 μs.
- What are some typical applications of the AD605?
The AD605 is suitable for applications such as audio and video signal processing, medical imaging, industrial control, telecommunications, and test and measurement equipment.
