Analog Devices AD8337 Evaluation Board AD8337-EVALZ-SS AD8337-EVALZ-SS Datenbogen

 

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Part numbers for fully assembled boards are listed in Table 1. 

AD8337-EVAL Dual-supply 

noninverting 

AD8337-EVAL-INV Dual-supply 

inverting 

AD8337-EVAL-SS Single-supply 

noninverting 

Within limits, the AD8337 preamplifier gain is controlled by 
Resistor RFB1 and Resistor RFB2. See the 

 data sheet 

for rules applying to the current-feedback preamplifier. Figure 5, 
Figure 6, and Figure 7 are schematics for the various circuit 
configurations. 

The AD8337 VGA output stage is specified for driving loads of 
500 Ω or greater. To protect the stage from accidental overload, 
a 453 Ω resistor is provided which, when connected to 50 Ω test 
equipment inputs, enables safe operation. In certain high load 
impedance situations, the user can reduce the value of this 
resistor; however, if load capacitance values greater than 
approximately 20 pF are anticipated, such as a BNC cable, the 
minimum series resistor value should not be less than 20 Ω. 

An alternate test pin is also provided for direct access to the 
output of the 

 VGA. The pin is typically used for a 

probe, and a 0 Ω resistor is provided between the test loop and 
the output pin. If the test loop is connected to loads ≤500 Ω, 
then the 0 Ω resistor should be changed to an appropriate value.