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PDF ZNBG3116 Data sheet ( Hoja de datos )

Número de pieza ZNBG3116
Descripción FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
Fabricantes Zetex Semiconductors 
Logotipo Zetex Semiconductors Logotipo



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No Preview Available ! ZNBG3116 Hoja de datos, Descripción, Manual

FET BIAS CONTROLLER WITH POLARISATION
SWITCH AND TONE DETECTION
ISSUE 1 - JUNE 2001
ZNBG3115
ZNBG3116
DEVICE DESCRIPTION
The ZNBG series of devices are designed to meet the
bias requirements of GaAs and HEMT FETs
commonly used in satellite receiver LNBs, PMR,
cellular telephones etc. with a minimum of external
components.
Drain current setting of the ZNBG3115/16 is user
selectable over the range 0 to 15mA, this is achieved
with addition of a single resistor. The series also offers
the choice of drain voltage to be set for the FETs, the
3115 gives 2.2 volts drain whilst the 3116 gives 2 volts.
With the addition of two capacitors and a resistor the
devices provide drain voltage and current control for
three external grounded source FETs, generating
the regulated negative rail required for FET gate
biasing whilst operating from a single supply. This
negative bias, at -2.8 volts, can also be used to
supply other external circuits.
The ZNBG3115/16 includes bias circuits to drive up
to three external FETs. A control input to the device
selects either one of two FETs as operational, the
third FET is permanently active. This feature is
normally used as an LNB polarisation switch. Also
specific to Universal LNB applications is the 22kHz
tone detection and logic output feature which is
used to enable high and low band frequency
switching.
The ZNBG3115/16 has been designed to cope with
DiSEqC™ ready set top boxes and rejects all
transients from channel switching.
These devices are unconditionally stable over the full
working temperature with the FETs in place, subject to
the inclusion of the recommended gate and drain
capacitors. These ensure RF stability and minimal
injected noise.
It is possible to use less than the devices full
complement of FET bias controls, unused drain and gate
connections can be left open circuit without affecting
operation of the remaining bias circuits.
To protect the external FETs the circuits have been
designed to ensure that, under any conditions including
power up/down transients, the gate drive from the bias
circuits cannot exceed the range -3.5V to 1V.
Additionally each stage has its own individual current
limiter. Furthermore if the negative rail experiences a
fault condition, such as overload or short circuit, the
drain supply to the FETs will shut down avoiding
excessive current flow.
The ZNBG3115/16 are available in QSOP16 and QSOP20
for the minimum in device size. Device operating
temperature is -40 to 80°C to suit a wide range of
environmental conditions.
FEATURES
Provides bias for GaAs and HEMT FETs
Drives up to three FETs
Dynamic FET protection
Drain current set by external resistor
Regulated negative rail generator requires only
2 external capacitors
Choice in drain voltage
Wide supply voltage range
Polarisation switch for LNBs
22kHz tone detection for band switching
Tone detector ignores unwanted signals
Support fr MIMIC, FET and Bipolar local
oscillator devices
Compliant with ASTRA control specifications
QSOP 16 and 20 surface mount packages
APPLICATIONS
Satellite receiver LNBs
Private mobile radio (PMR)
Cellular telephones
ISSUE 1 - JUNE 2001
1

1 page




ZNBG3116 pdf
TEST CIRCUIT 1
ZNBG3115
ZNBG3116
Note: Same circuit used for QSOP16 option but with adjusted pinout.
ISSUE 1 - JUNE 2001
5

5 Page





ZNBG3116 arduino
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 FIN enables one of two outputs, LB and HB. A tone present enables HB and tone absent enables
LB. The LB and HB outputs are designed to be compatible with both MMIC and discrete (bipolar or FET) local
oscillator applications, selected by pin LOV. Referring to Figure 1 wiring pin LOV to ground will force LB and HB to
switch between -2.6V (disabled) and 0V (enabled). Referring to Figures 2 and 3 wiring pin LOV to a positive voltage
source (e.g. a potential divider across VCC and ground set to the required oscillator supply voltage, VOSC) will
force the LB and HB outputs to provide the required oscillator supply, VOSC, when enabled and 0V when disabled.
Tone Detection Function
LOV
GND
VOSC
FIN
22kHz
22kHz
LB
Disabled
Enabled
Disabled
Enabled
HB
Enabled
Disabled
Enabled
Disabled
LB
-3 volts
GND
Note 1
VOSC
Note 1: 0 volts in typical LNB applications but ependent on extenal circuits.
HB
GND
-3 volts
VOSC
Note 1
ISSUE 1 - JUNE 2001
11

11 Page







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