znbg3113 Zetex Semiconductors plc., znbg3113 Datasheet

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znbg3113

Manufacturer Part Number
znbg3113
Description
Znbg3113 - Fet Bias Controller With Polarization Switch And Tone Detection
Manufacturer
Zetex Semiconductors plc.
Datasheet

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FET BIAS CONTROLLER WITH POLARISATION
SWITCH AND TONE DETECTION
ISSUE 1 - OCTOBER 1998
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
p e r m a n e n t l y a ct i v e . T hi s f e a t u r e i s
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.
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
4-123
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.
APPLICATIONS
Satellite receiver LNBs
Private mobile radio (PMR)
Cellular telephones
ZNBG3113
ZNBG3114

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znbg3113 Summary of contents

Page 1

... QSOP surface mount package ZNBG3113 ZNBG3114 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 ...

Page 2

... ZNBG3113 ZNBG3114 ABSOLUTE MAXIMUM RATINGS Supply Voltage -0.6V to 12V Supply Current 100mA Input Voltage (V ) 25V Continuous POL Drain Current (per FET 15mA (set CAL Operating Temperature -40 to 70°C Storage Temperature -50 to 85°C ELECTRICAL CHARACTERISTICS. TEST CONDITIONS (Unless otherwise stated):T amb ...

Page 3

... V D3 Voltage Change V with 10V with T T =-40 to +70° Leakage Current I Drain 1 V =0.1V Drain 2 V =0.1V ZNBG3113 ZNBG3114 MIN. - POL GOx ( =14 I =-10 -2.7 POL GO1 =15.5 I =-10 -2.7 POL GO1 =15 0.4 POL GO1 =15.5 I =-10 -2.7 POL ...

Page 4

... ZNBG3113 ZNBG3114 SYMBOLPARAMETER CONDITIONS TONE DETECTION CHARACTERISTICS Filter Amplifier I Input Bias Current R =150k Output Voltage R =150k OUT Output Current V =1.96V, V OUT OUT G Voltage Gain f=22kHz,V V Rectifier 5 V Output Voltage R =150k OUT Leakage Current R =150k LEAK F1 Comparator V Threshold ...

Page 5

... TEST CIRCUIT 1 TEST CIRCUIT 2 ZNBG3113 ZNBG3114 V2 Characteristics Type AC source Frequency 22kHz Voltage 350mV p/p enabled 100mV p/p disabled V2 Characteristics Type AC source Frequency 22kHz Voltage 350mV p/p enabled 100mV p/p disabled 4-127 ...

Page 6

... ZNBG3113 ZNBG3114 TYPICAL CHARACTERISTICS 16 Vcc = (k) cal JFET Drain Current v R cal 2.4 2.3 2.2 Vcc = 10V 2.1 2 Drain Current (mA) JFET Drain Voltage v Drain Current Note:- Operation with loads > 200µA is not guaranteed. 0.0 -0.5 -1.0 Vcc = ...

Page 7

... Frequency (Hz) Open Loop Phase v Frequency 1 1.2 V =0.1Vpkpk IN Test Circuit 1 1.0 0.8 0.6 0.4 0.2 0 100 1k 10k 100k Frequency (Hz) Filter Response ZNBG3113 ZNBG3114 10M Load Current (mA) LB/HB Offset Voltage v Load Current 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 10M Load Current (mA) ...

Page 8

... The ZNBG devices provide all the bias requirements for external FETs, including the generation of the negative supply required for gate biasing, from the single supply voltage.The diagram above shows a single stage from the ZNBG series. The ZNBG3113/14 contains 3 such stages. The negative rail generator is common to both devices. ...

Page 9

... FET number Q3 is always active regardless of the voltage applied POL Control Input Switch Function Input Sense Polarisation Select Vertical FET Q2 14 volts Horizontal FET Q1 15.5 volts ZNBG3113 ZNBG3114 input. Only one of the two external FETs POL 4-131 . POL ...

Page 10

... ZNBG3113 ZNBG3114 For many LNB applications tone detection and band switching is required. The ZNBG3113/14 includes the circuitry necessary to detect the presence of a 22kHz tone modulated on the supply input to the LNB. Referring to the following schematic diagram, the main elements of this detector are an op-amp enabling the construction of a Sallen Key filter, a rectifier/smoother and a comparator ...

Page 11

... Should the negative bias generator be shorted or overloaded so that the drain current of the external FETs can no longer be controlled, the drain supply to FETs is shut down to avoid damage to the FETs by excessive drain current. ZNBG3113 ZNBG3114 pin. SUB ...

Page 12

... 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 ...

Page 13

... Figure 1 L grounded OV Figure 2 L connected OSC ZNBG3113 ZNBG3114 4-135 ...

Page 14

... ZNBG3113 ZNBG3114 CONNECTION DIAGRAM ORDERING INFORMATION Part Number Package ZNBG3113Q20 QSOP20 ZNBG3114Q20 QSOP20 Part Mark ZNBG3113 ZNBG3114 4-136 ...

Page 15

... ZNBG3113 ZNBG3114 PACKAGE DIMENSIONS IDENTIFICATION RECESS FOR PIN 1 PIN No.1 PIN Millimetres Inches MIN MAX MIN MAX A 8.55 8.74 0.337 0.344 B 0.635 0.025 NOM C 1.42 1.52 0.056 0.06 D 0.20 0.30 0.008 0.012 E 3.81 3.99 0.15 0.157 F 1.35 1.75 0.053 0.069 G 0.10 0.25 0.004 0.01 J 5.79 6.20 0.228 0.244 K 0° 8° 0° 8° Page Number ...

Page 16

... The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. ZNBG3113 ZNBG3114 Zetex (Asia) Ltd. These are supported by ...

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