AT1511 AIMTRON | Alldatasheet

Document overview

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Technical content

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 - supporting zero volt gate switching topology.
  • 22kHz tone detection for band switching
  • Compliant with ASTRA control specifications
  • SSOP surface mount package

Applications

˙Satellite receiver LNBs ˙Private mobile radio (PMR) ˙Cellular telephones

Description

The AT1511 includes bias circuits to drive up to three external FETs. A control input to the device selects either one of two FETs as operational using 0V gate switching methodology, the third FET is permanently active. This feature is particularly used as an LNB polarisation switch. Also specific to LNB applications is the enhanced 22kHz tone detection and logic output feature which is used to enable high and low band frequency switching. The detector has been specifically designed to reject inerference such as low frequency signals and DiSEqC TM tone bursts - without the use of additional external components. Drain current setting of the AT1511 is user selectable over the range 0 to 15mA, this is achieved with the addition of a single resistor. The series also offers the choice of FET drain voltage, the AT1511 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. 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 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 AT1511 are available in SSOP20 for the minimum in device size. Device operating temperature is -40 to 70°C to suit a wide range of environmental conditions. Aimtron reserves the right without notice to change this circuitry and specifications.

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Block Diagram (a) Drain Voltage & Current Controller (b)Polarisation Switch

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw (c)Tone Detection Pin Descriptions Pin No. Pin name Function

1 G1 1st Gate output voltage Pin

2 D1 1st Drain output voltage Pin

3 G2 2nd Gate output voltage Pin

4 D2 2nd Drain output voltage Pin

5 G3 3rd Gate output voltage Pin

6 D3 3rd Drain output voltage Pin

7 GND Ground Pin

8 CP Positive OSC output Pin

9 CN Negative OSC output Pin

10 N.C. No connect Pin

11 VOUT Negative voltage output Pin

12 LB Error Amplifier output Pin

13 HB Error Amplifier inverted output Pin

14 LOV Error Amplifier input Pin

15 FOUT Filter input Pin

16 N.C. No connect Pin

17 FIN Filter output Pin

18 VPOL Polarisation switch controller Pin

19 ICTL Drain Current set Resistor connect Pin

20 VCC Supply voltage Pin

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Pin Configuration

Ordering Information

Part number Package Marking AT1511R SSOP20 AT1511R AT1511R_GRE SSOP20,Green AT1511R, date code with one bottom line Absolute maximum ratings (Ta = 25oC) Parameter Symbol Limits unit Power supply voltage V CC -0.6~12 V Supply Current I CC 100 mA Input V oltage V POL 25 V Drain Current V D 0~15 mA Operating temperature T opr -40~+70 oC Storage temperature T stg -50~+85 oC Power dissipation P d 500 mW Recommended operating conditions (Ta = 25oC) Parameter Symbol Limits unit Power supply voltage V CC 5~10 V

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

Electrical characteristics

(Unless otherwise stated, Ta=25°C, VCC=5V, ID=10mA, RCTL=33kΩ) Parameter Symbol Min. Typ. Max. Unit Conditions Supply V oltage V CC 5- - 1 0 V -- 6 10 mA I D1 to ID3=0 -- 25 35 mA ID1=0,ID2 to ID3=10mA, VPOL=14V -- 25 35 mA ID2=0,ID1 to ID3=10mA, VPOL=15.5V -- 16 25 I D1 to ID3=0, ILB=10mA Supply Current I CC -- 16 25 mA I D1 to ID3=0, IHB=10mA -3.5 -3.0 -2.5 V I OUT= 0Negative V oltage V OUT -- -- -2.4 V IOUT= -200µA Drain Output Noise V oltage E ND -- -- 0.02 V PP CG=4.7nF, CD=10nF Gate Output Noise V oltage E NG -- -- 0.005 V PP CG=4.7nF, CD=10nF Oscillator Freq. fo 200 350 800 kHz DRAIN Drain Current I D 81 0 1 2 m A Drain Current Charge with VCC ∆IDV -- 0.5 -- %/V V CC=5 to 10V Drain Current Charge with Tj ∆IDT -- 0.05 -- %/℃ Tj=-40 to +70°C VD1 1.8 2.0 2.2 V I D1=10mA, VPOL=15.5V VD2 1.8 2.0 2.2 V I D2=10mA, VPOL=14VDrain V oltage VD3 1.8 2.0 2.2 V I D3=10mA Drain V oltage Charge with VCC ∆VDV -- 0.5 -- %/V V CC=5 to 12V Drain V oltage Charge with Tj ∆VDT -- 50 -- ppm T j=-40 to +70°C IL1 -- -- 10 µA VD1=0.5V, VPOL=14VLeakage Current IL2 -- -- 10 µA VD2=0.5V, VPOL=15.5V GATE Gate Output Current Range I GO -30 -- 2000 µA VG10 -0.05 0 0.05 V I D1=0, VPOL=14V, IGO1=0 VG1L -3.5 -2.9 -2.0 V ID1=12mA, VPOL=15.5V, IGO1=-10µAGate1 Output V oltage VG1H 0 . 40 . 7 51 . 0 V ID1=8mA, VPOL=15.5V, IGO1=0 VG20 -0.05 0 0.05 V I D2=0, VPOL=15.5V, IGO2=0 VG2L -3.5 -2.9 -2.0 V ID2=12mA, VPOL=14V, IGO2=- 10µAGate2 Output V oltage VG2H 0 . 40 . 7 51 . 0 V I D2=8mA, VPOL=14V, IGO2=0 TONE DETECTION Input Bias Current I B 0.02 0.07 0.25 µAR F1=150kΩ Output Voltage V OUT 1.75 1.95 2.05 V RF1=150kΩ Output Current I OUT 400 520 650 µA VOUT=1.96V, VFIN=2.1V Voltage Gain G V -- 46 -- dB f=22kHz,V IN=1mV Rejection Frequency f R 1.0 7.5 -- kHz V (AC)in=1V p/p sq.w LOV Volt. Range V LOV -0.5 -- VCC-1.8 VI L=50mA(LB or HB) LOV Bias Current I LOV 0.02 0.15 1.0 µA VLOV=0

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw -0.025 0 0.025 V V LOV=0, IL=10mA, DisabledLB Output High V LBH 2.9 3.0 3.1 V V LOV=3V,IL=50mA,Disabled POLARITY SWITCH Input Current I POL 10 20 40 µA VPOL=25V(Applied via RPOL=10kΩ) Threshold Voltage V TPOL 14 14.75 15.5 V VPOL=25V(Applied via RPOL=10kΩ) Switching Speed T SPOL -- -- 100 ms VPOL=25V(Applied via RPOL=10kΩ) Test Circuit (a) LOV Connected to ground (b) LOV Connected to VOSC

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Application Circuit

Application Information

(a) LOV Connected to ground

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw (b) LOV Connected to VOSC

Preliminary product Information FET BIAS CONTROLLER AND TONE DETECTION Tel: 886-3-563-0878 http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Package Outlines : 20-pin SSOP MILLIMETERS INCHESSYMBOL MIN TYP MAX MIN TYP MAX A1 0.10 - 0.25 0.004 - 0.010 θ 0° 8° 0° 8°