This part is a kind of semiconductor called AD600.

Function of this product has Dual/ Low Noise/ Wideband Variable Gain Amplifiers.

Manufacturers : Analog Devices

Image and pinout :

Some of the text within the PDF file :

a FEATURES Two Channels with Independent Gain Control “Linear in dB” Gain Response Two Gain Ranges: AD600: 0 dB to +40 dB AD602: –10 dB to +30 dB Accurate Absolute Gain: ؎0.3 dB Low Input Noise: 1.4 nV/√Hz Low Distortion: –60 dBc THD at ؎1 V Output High Bandwidth: DC to 35 MHz (–3 dB) Stable Group Delay: ؎2 ns Low Power: 125 mW (max) per Amplifier Signal Gating Function for Each Amplifier Drives High Speed A/D Converters MIL-STD-883 Compliant and DESC Versions Available APPLICATIONS Ultrasound and Sonar Time-Gain Control High Performance Audio and RF AGC Systems Signal Measurement C1HI C1LO VG Dual, Low Noise, Wideband Variable Gain Amplifiers AD600/AD602* FUNCTIONAL BLOCK DIAGRAM GAT1 SCALING REFERENCE PRECISION PASSIVE INPUT ATTENUATOR GATING INTERFACE A1OP GAIN CONTR [ ... ]

AD600 PDF Datasheet Download