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ZNBG3115
ZNBG3116
APPLICATIONS INFORMATION(cont)
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.
Single Universal LNB Block Diagram
Regulator
ZNBG3115/16
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 applied to pin F IN enables one of two outputs, L B and H B . A tone present enables H B and tone absent enables
L B . The L B and H B outputs are designed to be compatible with both MMIC and discrete (bipolar or FET) local
oscillator applications, selected by pin L OV . Referring to Figure 1 wiring pin L OV to ground will force L B and H B to
switch between -2.6V (disabled) and 0V (enabled). Referring to Figures 2 and 3 wiring pin L OV to a positive voltage
source (e.g. a potential divider across V CC and ground set to the required oscillator supply voltage, V OSC ) will
force the L B and H B outputs to provide the required oscillator supply, V OSC , when enabled and 0V when disabled.
Tone Detection Function
L OV
G ND
V OSC
F IN
22kHz
—
22kHz
—
L B
Disabled
Enabled
Disabled
Enabled
H B
Enabled
Disabled
Enabled
Disabled
L B
-3 volts
G ND
Note 1
V OSC
H B
G ND
-3 volts
V OSC
Note 1
Note 1:
0 volts in typical LNB applications but ependent on extenal circuits.
11
ISSUE 2 - JUNE 200 6
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