ZNBG3115Q16TC Diodes Zetex, ZNBG3115Q16TC Datasheet

ZNBG3115Q16TC

Manufacturer Part Number

ZNBG3115Q16TC

Description

IC SW 3BIAS TONE H/V 2.2V 16QSOP

Manufacturer

Diodes Zetex

Datasheet

1.ZNBG3115Q16TC.pdf (15 pages)

Specifications of ZNBG3115Q16TC

Function

Bias Controller

Rf Type

LNBs, PMR

Secondary Attributes

with Polarization Switch and Tone Detection

Package / Case

16-QSOP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

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Part Number:

ZNBG3115Q16TC

Manufacturer:

ZETEX

Quantity:

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Company:

H&T Electronics

Part Number:

ZNBG3115Q16TC

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Company:

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Part Number:

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FET BIAS CONTROLLER WITH POLARISATION

SWITCH AND TONE DETECTION

ISSUE 2 - JUNE 2006

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 -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.

FEATURES

ISSUE 2 - JUNE 2006

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

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.

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.

APPLICATIONS

Satellite receiver LNBs

Private mobile radio (PMR)

Cellular telephones

ZNBG3115

ZNBG3116

Related parts for ZNBG3115Q16TC

ZNBG3115Q16TC Summary of contents

Page 1

FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION ISSUE 2 - JUNE 2006 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, ...

Page 2

ZNBG3115 ZNBG3116 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 80°C Storage Temperature -50 ...

Page 3

SYMBOL PARAMETER GATE CHARACTERISTICS I Output Current Range GO Output Voltage V Gate 1 Off G1O V Low G1L V High G1H Output Voltage V Gate 2 Off G2O V Low G2L V High G2H Output Voltage V Gate 3 ...

Page 4

ZNBG3115 ZNBG3116 SYMBOL PARAMETER TONE DETECTION CHARACTERISTICS V Filter Amplifier OUT 5 Bias Voltage F Input Impedance inz AG Amplifier Gain Threshold T Output Stage Volt. Range LOV Bias Current LOV ...

Page 5

TEST CIRCUIT 1 Note: Same circuit used for QSOP16 option but with adjusted pinout. ISSUE 2 - JUNE 2006 ZNBG3115 ZNBG3116 5 ...

Page 6

ZNBG3115 ZNBG3116 6 ISSUE 2 - JUNE 2006 ...

Page 7

FUNCTIONAL DIAGRAM FUNCTIONAL DESCRIPTION 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 ...

Page 8

ZNBG3115 ZNBG3116 The following schematic shows the function of the V Q2 are powered at any one time, their selection is controlled by the input V to the power input of the LNB via a high value (10k) resistor. With ...

Page 9

For many LNB applications, tone detection for band switching is required. The ZNBG3115/16 includes all the circuitry necessary to detect the presence of a 22kHz tone modulated on the supply input to the LNB. The main elements of the detector ...

Page 10

ZNBG3115 ZNBG3116 APPLICATIONS CIRCUIT The diagrams below show partial application circuits for the ZNBG series showing all external components required for appropriate biasing. The bias circuits are unconditionally stable over the full temperature range with the associated FETs and gate ...

Page 11

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, ...

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ZNBG3115Q16TC Diodes Zetex, ZNBG3115Q16TC Datasheet

ZNBG3115Q16TC

Specifications of ZNBG3115Q16TC

Available stocks

Related parts for ZNBG3115Q16TC

ZNBG3115Q16TC Summary of contents

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