ZNBG3115Q20TC【PDF 1/15 页】IC SW 3BIAS TONE H/V 2.2V 20QSOP

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FET BIAS CONTROLLER WITH POLARISATION

SWITCH AND TONE DETECTION

ISSUE 2 - JUNE 200 6

DEVICE DESCRIPTION

ZNBG3115

ZNBG3116

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

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

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

Satellite receiver LNBs

Private mobile radio (PMR)

Cellular telephones

ISSUE 2 - JUNE 200 6

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