Diodes ZNBG3114 Bedienungsanleitung PDF herunterladen

FET BIAS CONTROLLER WITH POLARISATION

SWITCH AND TONE DETECTION

ISSUE 1 - OCTOBER 1998

ZNBG3113

ZNBG3114

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.

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 -3 volts, can also be used to

supply other external circuits.

The ZNBG3113/14 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

particularly used as an LNB polarisation

switch. Also specific to LNB applications is

the 22kHz tone detection and logic output

feature which is used to enable high and low

band frequency switching.

The facility to control the tone switching

delay is provided. This allows the rejection

of other lower frequency tones tat may be

present in multiple LNB applications.

Drain current setting of the ZNBG3113/14 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 3113 gives

2.2 volts drain whilst the 3114 gives 2 volts.

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.

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 ZNBG3113/14 are available in QSOP20

for the minimum in device size. Device

operating temperature is -40 to 70°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

•

Programmable tone delay

•

Compliant with ASTRA control

specifications

•

QSOP surface mount package

APPLICATIONS

•

Satellite receiver LNBs

•

Private mobile radio (PMR)

•

Cellular telephones

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ZNBG3113 1
ZNBG3114 1

Inhaltsverzeichnis

Seite 1 - ZNBG3114

FET BIAS CONTROLLER WITH POLARISATIONSWITCH AND TONE DETECTIONISSUE 1 - OCTOBER 1998ZNBG3113ZNBG3114DEVICE DESCRIPTIONThe ZNBG series of devices are d

Seite 2

For many LNB applications tone detection and band switching is required. The ZNBG3113/14includes the circuitry necessary to detect the presence of a 2

Seite 3

4-133APPLICATIONS CIRCUITAPPLICATIONS INFORMATIONThe above is a partial application circuit for the ZNBG series showing all external componentsrequire

Seite 4

ZNBG3113ZNBG3114Single Universal LNB Block DiagramThe following block diagram shows the main section of an LNB designed for use with the Astraseries o

Seite 5

ZNBG3113ZNBG31144-135 Figure 1 LOV grounded Figure 2 LOV connected to VOSC

Seite 6

4-136ZNBG3113ZNBG3114ORDERING INFORMATIONPart Number Package Part MarkZNBG3113Q20 QSOP20 ZNBG3113ZNBG3114Q20 QSOP20 ZNBG3114CONNECTION DIAGRAM

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ZNBG3113ZNBG3114Page NumberPACKAGE DIMENSIONSPIN No.1IDENTIFICATIONRECESSFOR PIN 1ABDCKPIN Millimetres InchesMIN MAX MIN MAXA 8.55 8.74 0.337 0.344B 0

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ZNBG3113ZNBG3114 Zetex plc. Fields New Road, Chadderton, Oldham, OL9-8NP, United Kingdom. Telephone: (44)161 622 4422 (Sales), (44)161 622 4444 (Gener

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ABSOLUTE MAXIMUM RATINGSSupply Voltage -0.6V to 12VSupply Current 100mAInput Voltage (VPOL) 25V ContinuousDrain Current (per FET) 0 to 15mA(set by RCA

Seite 11

SYMBOLPARAMETER CONDITIONSLIMITSUNITSMIN. TYP. MAX.GATE CHARACTERISTICSIGOOutput CurrentRange-30 2000µAIDxVPOLIGOx(mA) (V) (µµA)VG1OVG1LVG1HOutput V

Seite 12

SYMBOLPARAMETER CONDITIONSLIMITSUNITSMIN. TYP. MAX.TONE DETECTION CHARACTERISTICSIBFilter AmplifierInput Bias CurrentRF1=150kΩ0.04 0.15 1.0µAVOUTOutpu

Seite 13

V2 CharacteristicsType AC sourceFrequency 22kHzVoltage 350mV p/p enabled100mV p/p disabledV2 CharacteristicsType AC sourceFrequency 22kHzVoltage 350

Seite 14

JFET Drain Current v Rcal0204060 1000246810Rcal(k)80121416JFET Drain Voltage v Drain Current2468 162.02.12.2Drain Current (mA)102.32.412 14Vsub v Exte

Seite 15

Filter Response100 1k 10k 100k 1M00.20.40.60.81.0Frequency (Hz)1.21.4Stability Boundary10nF 100nF1.0LB/HB Load Capacitance101uF0.11001nF100pF10pFStabl

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FUNCTIONAL DIAGRAMFUNCTIONAL DESCRIPTIONThe ZNBG devices provide all the bias requirements for external FETs, including the generationof the negative

Seite 17

The following schematic shows the function of the VPOL input. Only one of the two external FETsnumberd Q1 and Q2 are powered at any one time, their se

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