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AD604

Analog Devices
Part Number AD604
Manufacturer Analog Devices
Description Dual/ Ultralow Noise Variable Gain Amplifier
Published Mar 23, 2005
Detailed Description a FEATURES Ultralow Input Noise at Maximum Gain: 0.80 nV/√Hz, 3.0 pA/ √Hz Two Independent Linear-in-dB Channels Absolute...
Datasheet PDF File AD604 PDF File

AD604
AD604

Overview
a FEATURES Ultralow Input Noise at Maximum Gain: 0.
80 nV/√Hz, 3.
0 pA/ √Hz Two Independent Linear-in-dB Channels Absolute Gain Range per Channel Programmable: 0 dB to +48 dB (Preamp Gain = +14 dB), through +6 dB to +54 dB (Preamp Gain = +20 dB) ؎1.
0 dB Gain Accuracy Bandwidth: 40 MHz (–3 dB) 300 k⍀ Input Resistance 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 Can Drive A/D Converters Directly APPLICATIONS Ultrasound and Sonar Time-Gain Control High Performance AGC Systems Signal Measurement Dual, Ultralow Noise Variable Gain Amplifier AD604 FUNCTIONAL BLOCK DIAGRAM PAO –DSX +DSX VGN GAIN CONTROL AND SCALING DIFFERENTIAL ATTENUATOR R-1.
5R LADDER NETWORK 0 TO –48.
4dB VOCM PROGRAMMABLE ULTRALOW NOISE PREAMPLIFIER G = 14–20dB PRECISION PASSIVE INPUT ATTENUATOR VREF PAI AFA OUT FIXED GAIN AMPLIFIER +34.
4dB PRODUCT DESCRIPTION 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 will support 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.
User determined gain ranges, gain scaling (dB/V) and dc level shifting of output further optimize application performance.
Each channel of the AD604 utilizes a high performance preamplifier that provides an input referred noise voltage of 0.
8 nV/√Hz.
The very accurate linear-in-dB response of the AD604 is achieved with the differential input exponential amplifier (DSX-AMP) architecture.
Each of the DSX-AMPs comprise a variable attenuator of 0 dB to 48.
36 dB followed by a high speed fixed gain amplifier.
The attenuator is based on a seven stage R-1.
5R ladder network.
The attenuation between tap points is 6.
908 dB and 48.
36 dB for the ladder...


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