Analog Devices AD604
The AD604 is an ultralow noise, very accurate, dual-channel, linear-in-dB variable gain amplifier (VGA) optimized for timebased variable gain control in ultrasound applications; however, it supports any application requiring low noise, wide bandwidth, variable gain control. Each channel of the AD604 provides a 300 kΩ input resistance and unipolar gain control for ease of use. Each channel of the AD604 uses a high performance preamplifier that provides an input-referred noise voltage of 0.8 nV/√Hz.
| Part No. |
AD604 |
| Datasheet |
AD604
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| Manufacturer |
 Analog Devices |
| Description |
Ultralow Noise Variable Gain Amplifier |
| Buy |
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FEATURES
Ultralow input noise at maximum gain 0.80 nV/√Hz, 3.0 pA/√Hz 2 independent linear-in-dB channels Absolute gain range per channel programmable 0 dB to 48 dB (preamplifier gain = 14 dB) through 6 dB to 54 dB (preamplifier gain = 20 dB) ±1.0 dB gain accuracy Bandwidth: 40 MHz (−3 dB) Input resistance: 300 kΩ Variable gain scaling: 20 dB/V through 40 dB/V Stable gain with temperature and supply variations Single-ended unipolar gain control Power shutdown at lower end of gain control Drive ADCs directly APPLICATIONS
Ultrasound and sonar time-gain controls High performance AGC systems Signal measurement GENERAL DESCRIPTION
User-determined gain ranges, gain scaling (dB/V), and dc level shifting of output further optimize performance. The very accurate linear-in-dB response of the AD604 is achieved with the differential input exponential amplifier (DSX-AMP) architecture. Each DSX-AMP comprises a variable attenuator of 0 dB to 48.36 dB followed by a high speed fixed-gain amplifier. The attenuator is a 7-stage R-1.5R ladder network.
