ZNBG3115

ZNBG3116

ISSUE 1 - JUNE 2001

11

ZNBG3115/16

Regulator

Single Universal LNB Block Diagram

The following block diagram shows the main section of an LNB designed for use with the Astra series of satellites.

The ZNBG3115/16 is the core bias and control element of this circuit. The ZNBG provides the negative rail, FET

bias control, polarisation switch control, tone detection and band switching with the minimum of external

components. Compared to other discrete component solutions the ZNBG circuit reduces component count and

overall size required.

APPLICATIONS INFORMATION(cont)

Tone detection and band switching is provided on the ZNBG3115/16 devices. The following diagrams describes

how this feature operates in an LNB and the external components required. The presence or absence of a 22kHz

Tone Detection Function

22kHz

Disabled

Enabled

-3 volts

—

Enabled

Disabled

-3 volts

22kHz

Disabled

Enabled

Note 1

—

Enabled

Disabled

Note 1

Note 1:

0 volts in typical LNB applications but ependent on extenal circuits.