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ZNBG3113
ZNBG3114
APPLICATIONS INFORMATION(cont)
The following block diagram shows the main section of an LNB designed for use with the Astra
series of satellites. The ZNBG3113/14 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
Tone detection and band switching is provided on the ZNBG3113/14 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 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 Figure 2 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.
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
-2.6 volts
G ND
Note 1
V OSC
H B
G ND
-2.6 volts
V OSC
Note 1
Note 1:
0 volts in typical LNB applications but ependent on extenal circuits.
4-134
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相关代理商/技术参数
ZNBG3114 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:FET BIAS CONTROLLER WITH POLARISATION
ZNBG3114Q20 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115_06 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115Q16 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115Q16TC 功能描述:MOSFET 3BIAS TONE H/V SWTCH 2.2V RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube
ZNBG3115Q20 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115Q20TC 功能描述:MOSFET 3BIAS TONE H/V SWTCH 2.2V RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube