Overview
The AD605AR-REEL7, produced by Analog Devices Inc., is a dual, low noise, single-supply variable gain amplifier (VGA). This device 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 in various configurations. 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 |
| Operating Temperature Range | −40°C to +85°C | °C |
| Storage Temperature Range | −65°C to +150°C | °C |
| Input Noise Spectral Density | 1.8 | nV/√Hz |
| Input Signal Range | ±2.0 V | V |
| Gain Range per Channel | −14 dB to +34 dB or 0 dB to +48 dB | dB |
| Quiescent Supply Current | 18 to 23 | mA |
| Power Dissipation | 90 | mW |
| Response Time for 48 dB Gain Change | 0.2 | μs |
| Package Type | 16-Lead SOIC_N |
Key Features
- Dual-channel, low noise, variable gain amplifier with differential inputs and unipolar gain control.
- Single-supply operation from 4.5 V to 5.5 V.
- High-performance linear-in-dB response using DSX-AMP architecture.
- Variable attenuator based on a 7-stage R-1.5R ladder network.
- User-determined gain range and external reference input for gain scaling (dB/V).
- Gain control interface with input resistance of approximately 2 MΩ.
- Low input noise spectral density of 1.8 nV/√Hz.
- Power-down mode with reduced current consumption.
- 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 diagnostic equipment.
- Industrial control and automation systems.
- Telecommunication systems, especially in RF and IF signal chains.
- Test and measurement equipment.
Q & A
- What is the operating supply voltage range of the AD605?
The AD605 operates from a single supply voltage of 4.5 V to 5.5 V.
- What is the temperature range for the AD605?
The AD605 is guaranteed to operate over a temperature range of −40°C to +85°C.
- What is the input noise spectral density of the AD605?
The input noise spectral density of the AD605 is 1.8 nV/√Hz.
- How is the gain range of the AD605 controlled?
The gain range of the AD605 is controlled by a gain control voltage (VGN) and can be optimized using an external reference input for gain scaling (dB/V).
- What are the available package types for the AD605?
The AD605 is available in 16-lead PDIP and 16-lead SOIC_N packages.
- Can the AD605 be powered down to reduce current consumption?
Yes, the AD605 can be powered down by setting VGN to less than 50 mV, reducing the current consumption to 1.9 mA.
- What is the maximum input signal range for the AD605?
The AD605 accepts an input signal range of ±2.0 V when VOCM is biased at VP/2.
- How can the gain range be extended using multiple AD605 devices?
The two channels of the AD605 can be cascaded to provide up to 96 dB of very accurate gain range.
- What is the response time for a 48 dB gain change in the AD605?
The response time for a 48 dB gain change is 0.2 μs.
- What is the quiescent supply current of the AD605?
The quiescent supply current of the AD605 is between 18 mA and 23 mA.
