AT1511
Preliminary product Information
FET BIAS CONTROLLER AND TONE DETECTION
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
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.
Applications
˙Satellite
receiver LNBs
˙Private
mobile radio (PMR)
˙Cellular
telephones
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
1
AT1511
Preliminary product Information
FET BIAS CONTROLLER AND TONE DETECTION
Block Diagram
(a) Drain Voltage & Current Controller
(b)Polarisation Switch
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
2
AT1511
Preliminary product Information
FET BIAS CONTROLLER AND TONE DETECTION
(c)Tone Detection
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin name
G1
D1
G2
D2
G3
D3
GND
CP
CN
N.C.
VOUT
LB
HB
LOV
FOUT
N.C.
FIN
VPOL
ICTL
VCC
Function
1st Gate output voltage Pin
1st Drain output voltage Pin
2nd Gate output voltage Pin
2nd Drain output voltage Pin
3rd Gate output voltage Pin
3rd Drain output voltage Pin
Ground Pin
Positive OSC output Pin
Negative OSC output Pin
No connect Pin
Negative voltage output Pin
Error Amplifier output Pin
Error Amplifier inverted output Pin
Error Amplifier input Pin
Filter input Pin
No connect Pin
Filter output Pin
Polarisation switch controller Pin
Drain Current set Resistor connect Pin
Supply voltage Pin
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
3
AT1511
Preliminary product Information
FET BIAS CONTROLLER AND TONE DETECTION
Pin Configuration
Ordering Information
Part number
AT1511R
AT1511R_GRE
Package
SSOP20
SSOP20,Green
Marking
AT1511R
AT1511R, date code with one bottom line
Absolute maximum ratings (Ta = 25
o
C)
Parameter
Power supply voltage
Supply Current
Input Voltage
Drain Current
Operating temperature
Storage temperature
Power dissipation
Symbol
V
CC
I
CC
V
POL
V
D
T
opr
T
stg
P
d
Limits
-0.6~12
100
25
0~15
-40~+70
-50~+85
500
unit
V
mA
V
mA
o
C
o
C
mW
Recommended operating conditions (Ta = 25
o
C)
Parameter
Power supply voltage
Symbol
V
CC
Limits
5~10
unit
V
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
4
AT1511
Preliminary product Information
FET BIAS CONTROLLER AND TONE DETECTION
Electrical characteristics
(Unless otherwise stated, Ta=25°C, V
CC
=5V, I
D
=10mA, R
CTL
=33kΩ)
Parameter
Symbol Min.
Typ. Max. Unit
Conditions
Supply Voltage
V
CC
5
--
10
V
--
6
10
mA I
D1
to I
D3
=0
I =0,I
D2
to I
D3
=10mA,
--
25
35
mA
D1
V
POL
=14V
I =0,I
D1
to I
D3
=10mA,
Supply Current
I
CC
--
25
35
mA
D2
V
POL
=15.5V
--
16
25
I
D1
to I
D3
=0, I
LB
=10mA
--
16
25
mA I
D1
to I
D3
=0, I
HB
=10mA
-3.5
-3.0
-2.5
V I
OUT
= 0
Negative Voltage
V
OUT
--
--
-2.4
V I
OUT
= -200µA
Drain Output Noise Voltage
E
ND
--
--
0.02
V
PP
C
G
=4.7nF, C
D
=10nF
Gate Output Noise Voltage
E
NG
--
--
0.005
V
PP
C
G
=4.7nF, C
D
=10nF
Oscillator Freq.
fo
200
350
800
kHz
DRAIN
Drain Current
I
D
8
10
12
mA
Drain Current Charge with V
CC
--
0.5
--
%/V V
CC
=5 to 10V
∆I
DV
Drain Current Charge with T
j
%/℃ T
j
=-40 to +70°C
--
0.05
--
∆I
DT
V
D1
1.8
2.0
2.2
V I
D1
=10mA, V
POL
=15.5V
Drain Voltage
V
D2
1.8
2.0
2.2
V I
D2
=10mA, V
POL
=14V
V
D3
1.8
2.0
2.2
V I
D3
=10mA
Drain
Voltage
Charge with V
CC
∆V
DV
--
0.5
--
%/V V
CC
=5 to 12V
Drain Voltage Charge with T
j
--
50
--
ppm T
j
=-40 to +70°C
∆V
DT
I
L1
--
--
10
µA
V
D1
=0.5V, V
POL
=14V
Leakage Current
I
L2
--
--
10
µA
V
D2
=0.5V, V
POL
=15.5V
GATE
Gate Output Current Range
I
GO
-30
--
2000
µA
V
G10
-0.05
0
0.05
V I
D1
=0, V
POL
=14V, I
GO1
=0
I
D1
=12mA, V
POL
=15.5V,
V
G1L
-3.5
-2.9
-2.0
V
Gate1 Output Voltage
I
GO1
=-10µA
I
D1
=8mA, V
POL
=15.5V,
0.4
0.75
1.0
V
V
G1H
I
GO1
=0
V
G20
-0.05
0
0.05
V I
D2
=0, V
POL
=15.5V, I
GO2
=0
I
D2
=12mA, V
POL
=14V, I
GO2
=-
Gate2 Output Voltage
V
G2L
-3.5
-2.9
-2.0
V
10µA
0.4
0.75
1.0
V I
D2
=8mA, V
POL
=14V, I
GO2
=0
V
G2H
V
G3L
-3.5
-2.9
-2.0
V I
D3
=12mA, I
GO3
=-10µA
Gate3 Output Voltage
V
G3H
0.4
0.75
1.0
V I
D3
=8mA, I
GO3
=0
TONE DETECTION
Input Bias Current
I
B
0.02
0.07
0.25
µA
R
F1
=150kΩ
Output Voltage
V
OUT
1.75
1.95
2.05
V R
F1
=150kΩ
Output Current
I
OUT
400
520
650
µA
V
OUT
=1.96V, V
FIN
=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
V
CC
-1.8
LOV Volt. Range
V
LOV
-0.5
--
V I
L
=50mA(LB or HB)
LOV Bias Current
I
LOV
0.02
0.15
1.0
µA
V
LOV
=0
-3.5
-2.75
-2.5
V V
LOV
=0, I
L
=-10µA, Enabled
LB Output Low
V
LBL
-0.01
0
0.01
V V
LOV
=3V, I
L
=0, Enabled
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
5
嵌入式系统
