ZNBG4008Q16TC

ZNBG4008 4 STAGE FET LNA BIAS CONTROLLER Description Pin Assignments The ZNBG4008 is a GaAs and HEMT FET bias controller intended primarily for satellite Low Noise Blocks (LNBs). With the addition of two capacitors and resistors, the device provides drain voltage and current control for up to 4 external grounded source FETs, generating the regulated negative rail required for FET gate biasing while operating from a single supply. The negative bias, at -3 volts, can also be used to supply other external circuits. In setting drain current, ZNBG4008 uses two resistors to split control between two and four FETs. This allows the operating current of input FETs to be adjusted to minimize noise, while the following FET stages can be separately adjusted for maximum gain. QSOP-16 Features Applications              Provides Bias for up to 4 GaAs and HEMT FETs Operating Range of 5.0 to 12.0V Dynamic FET Protection Amplifier FET Drain Current Selectable (0 to 15mA) Regulated Negative Rail Generator Requires only 2 External Capacitors Wide Supply Voltage Range QSOP-16 Surface Mount Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: Twin LNB’s Quad LNB’s Microwave Links PMR and Cellular Telephone Systems 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain