Overview
The AD604ARZ, produced by Analog Devices Inc., is an ultralow noise, dual-channel, linear-in-dB variable gain amplifier (VGA). It is optimized for time-based variable gain control, particularly in ultrasound applications, but is also suitable for any application requiring low noise and wide bandwidth variable gain control. Each channel of the AD604 provides a 300 kΩ input resistance and unipolar gain control, making it user-friendly. The amplifier features high-performance preamplifiers with an input-referred noise voltage of 0.8 nV/√Hz and utilizes a differential input exponential amplifier (DSX-AMP) architecture for accurate linear-in-dB response.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | 24-lead SOIC (Wide) |
| Input Resistance | 300 kΩ per channel |
| Input-Referred Noise Voltage | 0.8 nV/√Hz |
| Gain Range | 0 dB to 48 dB and 6 dB to 54 dB per channel |
| Gain Scaling | Up to 40 dB/V, with reduced accuracy above 30 dB/V |
| Gain Control Voltage | 0.4 V to 2.4 V for linear-in-dB control |
| Supply Voltage | ±6.5 V |
| Operating Temperature Range | −40°C to +85°C |
| Power Dissipation | 220 mW per channel (typical) |
| Quiescent Supply Current | 32 mA to 36 mA (VPOS), −15 mA to −12 mA (VNEG) per channel |
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 preamplifiers with adjustable gain and offset.
- Gain scaling up to 40 dB/V, with linear-in-dB response over a control voltage range of 0.4 V to 2.4 V.
- Access to the output of the preamplifier for external filtering.
- Cascadable channels for increased gain range.
- Operating temperature range of −40°C to +85°C.
Applications
- Ultrasound applications requiring time-based variable gain control.
- Professional audio and video equipment.
- Security systems.
- Distributed audio systems.
- Instrumentation and other applications requiring low noise and wide bandwidth variable gain control.
Q & A
- What is the primary application of the AD604ARZ?
The AD604ARZ is primarily optimized for time-based variable gain control in ultrasound applications, but it can be used in any application requiring low noise and wide bandwidth variable gain control.
- What is the input-referred noise voltage of the AD604ARZ?
The input-referred noise voltage of the AD604ARZ is 0.8 nV/√Hz.
- What are the gain ranges available per channel?
The gain ranges available per channel are 0 dB to 48 dB and 6 dB to 54 dB.
- How does the gain scaling work on the AD604ARZ?
The gain scales linearly in decibels with control voltages of 0.4 V to 2.4 V, with a gain scaling factor up to 40 dB/V.
- Can the channels of the AD604ARZ be cascaded?
- What is the operating temperature range of the AD604ARZ?
The operating temperature range of the AD604ARZ is −40°C to +85°C.
- What are the typical power dissipation and quiescent supply current values for the AD604ARZ?
The typical power dissipation is 220 mW per channel, and the quiescent supply current is 32 mA to 36 mA (VPOS) and −15 mA to −12 mA (VNEG) per channel.
- What package types are available for the AD604ARZ?
The AD604ARZ is available in 24-lead SOIC (Wide) packages.
- Can the AD604ARZ be used in professional audio equipment?
- How does the AD604ARZ handle external filtering?
The AD604ARZ provides access to the output of the preamplifier, allowing for external filtering between the preamplifier and the differential attenuator stage.
