ZNBG3000Q16 Zetex Semiconductors, ZNBG3000Q16 Datasheet

ZNBG3000Q16

Manufacturer Part Number

ZNBG3000Q16

Description

FET BIAS CONTROLLER

Manufacturer

Zetex Semiconductors

Datasheet

1.ZNBG3000Q16.pdf (9 pages)

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FET BIAS CONTROLLER

ISSUE 1- AUGUST 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 3 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 ZNBG3000/1 contains three bias stages.

A single resistor allows FET drain current to

be set to the desired level. The series also

offers the choice of drain voltage to be set

for the FETs, the ZNBG3000 gives 2.2 volts

drain whilst the ZNBG3001 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.

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

QSOP surface mount package

4-137

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.

In order 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 0.7V. 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 ZNBG3000/1 are available in QSOP16

packages for the minimum in devices 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

Single in single out C Band LNB

ZNBG3000

ZNBG3001

Related parts for ZNBG3000Q16

ZNBG3000Q16 Summary of contents

Page 1

FET BIAS CONTROLLER ISSUE 1- AUGUST 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 ...

Page 2

ZNBG3000 ZNBG3001 ABSOLUTE MAXIMUM RATINGS Supply Voltage -0.6V to 15V Supply Current 100mA Drain Current (per FET 15mA (set by R and R ) CAL1 CAL2 Output Current 100mA Operating Temperature -30 to 70°C Storage Temperature -40 to ...

Page 3

SYMBOL PARAMETER GATE CHARACTERISTICS I Output Current Range GO Output Voltage V Output Low OL V Output High OH Notes: 1. The negative bias voltages specified are generated on-chip using an internal oscillator. Two external capacitors, C 47nF are required ...

Page 4

ZNBG3000 ZNBG3001 TYPICAL CHARACTERISTICS 16 Vcc = Rcal (k) JFET Drain Current v Rcal 2.4 ZNBG3000 2.3 2.2 Vcc = 10V 2.1 2.0 ...

Page 5

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 ...

Page 6

ZNBG3000 ZNBG3001 TYPICAL APPLICATION CIRCUIT APPLICATIONS INFORMATION The above is a partial application circuit 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 ...

Page 7

APPLICATIONS INFORMATION (Continued) The ZNBG devices have been designed to protect the external FETs from adverse operating conditions. With a JFET connected to any bias circuit, the gate output voltage of the bias circuit can not exceed the range -3.5V ...

Page 8

... The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. ZNBG3000 ZNBG3001 ORDERING INFORMATION Part Number Package ZNBG3000Q16 QSOP16 ZNBG3001Q16 QSOP16 PIN No ...

Page 9

ZNBG4000 ZNBG4000 ZNBG4001 ZNBG6000 ZNBG6001 PACKAGE DIMENSIONS PIN Millimetres Inches MIN MAX MIN A 4.80 4.90 0.033 B 0.635 0.025 NOM C 0.177 0.267 0.007 D 0.20 0.30 0.008 IDENTIFICATION A RECESS B FOR PIN 1 D PIN No.1 E ...

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