150MHz Amplifier Module Wideband VCA821 Voltage-Controlled Digitally Controlled VGA with 0dB-40dB Linear Gain

150MHz Amplifier Module Wideband VCA821 Voltage-Controlled Digitally Controlled VGA with 0dB-40dB Linear Gain Description

Gain control range: 0dB to 40dB dynamic adjustment range
Maximum input/output voltage: For signals without significant distortion, the maximum input for -to-for voltage is 400mVpp. The maximum output for -to-for voltage depends frequency: 3Vpp at 100MHz, 2Vpp at 150MHz, and 1Vpp at frequencies above 150MHz
Frequency response: With gain between 0dB and 40dB, gain flatness is 1dB from 500Hz to 60MHz and 3dB to 90MHz; with gain between 0dB and 34dB, flatness is 1dB from 500Hz to 160MHz and 3dB to 200MHz; with gain between 0dB and 20dB, flatness is 1dB from 500Hz to 180MHz and 3dB to 360MHz
Input impedance: 50Ω,Power supply voltage: 5V
Output signal amplitude: Can be adjusted manually via an onboard potentiometer or controlled by an external DAC, enabling high-precision amplitude control. For example, with input signal frequencies of 10 kHz and 10 MHz and an input amplitude of 500 mVpp, the resulting waveforms are as shown in the figure

This is a digitally controllable amplifier module based the VCA821 wideband (150MHz) voltage-controlled amplifier (VGA), featuring a linear gain range of 0dB to 40dB that can be adjusted either manually or automatically.
In many signal acquisition systems-such as those capturing radio, , or ultrasonic signals propagating through space-signal amplitude fluctuates significantly as the propagation distance changes. If a receiver circuit applies a fixed gain, the resulting signal may become excessively large or small, making consistency difficult to maintain and complicating downstream signal processing. Therefore, the amplification circuit must be able to adjust its gain based the signal level to keep the output amplitude within a stable range. This module supports both manual gain adjustment and external voltage control, allowing it to accommodate input signa