AK1291

[AK1291]
AK1291
IF Variable Gain Amplifier with RSSI
1. Overview
AK1291 is a variable gain amplifier with a power detector. It’s operating frequency ranges from
90MHz to 300MHz. The gain control adopts an analog signal control, and the gain characteristic is
dB linear. The gain control range is -9dB to +21dB and a dynamic range is 30dB. AK1291 has
single-ended input and output, with impedance of 50 Ω. As a typical characteristic, NF is 7dB (at
maximum gain) , and IMD3 is 70dBc at output power of -15dBm ,at frequency of 165MHz.The
power supply voltage is 4.75V to 5.25V.
2. Feature
▪Operation Frequency Range
▪Gain variable range
▪Noise Figure
▪IMD3
▪Supply Voltage
▪Operating Temperature
▪Package
90MHz to 300MHz
-9dB to 21dB
7dB @max gain
70dBc @output power -15dBm
4.75V to 5.25V
-40°C to +85°C
24pin QFN0404
3. Block Diagram
VSS6
COM
VSS5
IAVDD
OAVDD
VSS4
VSS1
VSS3
RFINP
RFOUT
Buffer
RFINN
PVDD
DETVDD
GCON
Detector
DETIN
VSS2
BIAS
ENAB
DETOUT
Figure. 1 Block Diagram
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Contents
1.
Overview .................................................................................................................................................... 1
2.
Feature ....................................................................................................................................................... 1
3.
Block Diagram ........................................................................................................................................... 1
4.
Pin Configuration ....................................................................................................................................... 3
5.
Pin function Description ............................................................................................................................ 4
6.
Maximum Absolute Rating ........................................................................................................................ 5
7.
Recommended operational condition......................................................................................................... 5
8.
Electrical Characteristic .............................................................................................................................. 6
9.
Interface circuit .......................................................................................................................................... 8
10. Evaluation Board Schimatic .................................................................................................................... 10
11. Typical Performance ................................................................................................................................ 12
12. Marking.................................................................................................................................................... 14
13. Outer Dimensions .................................................................................................................................... 15
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VSS1
1
RFINP
2
RFINN
3
PVDD
4
GCON
5
VSS2
6
COM
IAVDD
VSS5
OAVDD
VSS4
TOP VIEW
VSS6
4. Pin Configuration
24
23
22
21
20
19
18
VSS3
17
RFOUT
16
DETVD
15
D
DETIN
14
DETOU
T
13
10
11
12
TEST2
TEST3
TEST4
9
TEST1
BIAS
8
ENAB
7
TEST5
Figure. 2 Pin Configuration
5. Block Function
Block
VGA
Power Detector
Function
Variable Gain Amplifier which is controlled by the voltage of 0.2 to 2.5V
Power detector which detect power level of VGA output
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6. Pin function Description
Pin No
1
2
3
4
5
6
Name
VSS1
RFINP
RFINN
PVDD
GCON
VSS2
I/O
G
AI
AI
P
AI
G
function
Ground
RF input Positive
RF input Negative
Power Supply
Control voltage input
Ground
Resistance connection pin
for current adjustment
7
BIAS
AIO
8
ENAB
DI
Power down control
9
10
11
12
13
14
15
16
17
18
19
20
21
22
TEST1
TEST2
TEST3
TEST4
TEST5
DETOUT
DETIN
DETVDD
RFOUT
VSS3
VSS4
OAVDD
VSS5
IAVDD:
DI
DI
DI
DI
DO
AO
AI
P
AO
G
G
P
G
P
23
COM
AIO
24
VSS6
G
Test pin
Test pin
Test pin
Test pin
Test pin
Detector output
Detector input
Power supply
RF output
Ground
Ground
Power supply
Ground
Power supply
Pin for input common
voltage
Ground
Remark
No resistance is connected.
ENAB=”High” Power on
ENAB=”Low” Power down
Connect to ground
Connect to ground
Connect to ground
Connect to ground
Connectionless
connect a capacitor of 10pF to ground
connect a capacitor of 10nF to ground
The exposed pad at the center of the backside
should be connected to ground.
Note) the exposed pad at the center of the backside should be connected to ground.
25
EXPAD
AI:Analog input pin
P: Power supply pin
G
Ground
AO:Analog output pin
G: Ground pin
DI: Digital Input pin
DO:Digital Output pin
＊About power down control: The power down of the whole IC is done by ENAB (pin8). In the case that ENAB is
“High”, VGA block and Detector block are power on state. In the case that let only Detector block power down,
connect DETVDD to the ground.
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7. Absolute Maximum Rating
Item
Symbol
Min.
Max.
unit
Remarks
Applied to
[PVDD],[IAVDD],[OAVDD],[DE
TVDD] note1)
Supply Voltage
VDD
-0.3
5.5
V
Ground Level
VSS
0
0
V
Analog input voltage
VAIN
-0.3
VDD+0.3
V
VDIN
-0.3
VDD+0.3
RFINP/RFINN
Pmax
+10
Maximum input Level
Storage Temperature
Tstg
-55
125
Note1) All voltage reference ground Level: 0V
V
Applied to[VSS1], [VSS2],[VSS3],
[VSS4],[VSS5],[VSS6] and
[EXPAD]
Applied to [RFINP],[RFINN],
[GCON] and [DETIN]
Applied to [ENAB]
note1)
dBm
C
Exceeding these maximum ratings may result in damage to the AK1291. Normal operation is not guaranteed at
these extremes
8. Recommended operational condition
Item
Operating
Temperature
Supply Voltage
Symbol
Min.
Ta
-40
VDD
4.75
Typ.
5
Max.
unit
85
C
5.25
V
Remarks
Applied to [PVDD],[IAVDD],
[OAVDD],and [DETVDD]
Each specification is applied in the power supply voltage and the operating temperature applied to
recommended operational condition.
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[AK1291]
9. Electrical Characteristic
DC Characteristic
Item
High Level Input Voltage
Low Level Input Voltage
Input leak current
Symbol
VIH
VIL
IIL
Current consumption 1
ICC1
Current consumption 2
ICC2
Current consumption 3
ICC3
Condition
Note1)
Note1)
Note1)
PVDD=OAVDD=IAVDD=
DETVDD=VDD,
ENAB=High
PVDD=OAVDD=IAVDD
＝VDD,
DETVDD=VSS,
ENAB=High
PVDD=OAVDD=IAVDD
＝VDD,
DETVDD=VSS,
ENAB=Low
Min.
0.8*VDD
0.0
-10
Typ.
Max.
0.2*VDD
10
Unit
V
V
µA
155
199
mA
151
195
mA
10
µA
Note1) Applied to [ENAB] pin
AC Characteristic
PVDD=OAVDD=IAVDD=4.75V～5.25V, Ta=-40°C～85°C
Item
VGA Block
Input Frequency
Input Impedance
Output Impedance
Gain control Range
Max. Gain
Min. Gain
Gain 1
Gain 2
Gain control voltage
range
Gain curve slope
note1)
Gain step response
<RFIN=90MHz>
Noise Figure note2)
Output P1dB
IMD3
<RFIN=165MHz>
Noise Figure note2)
Output P1dB
IMD3
<RFIN=300MHz>
Noise Figure note2)
Output P1dB
IMD3
Symbol
FOP
IIMP
OIMP
GCONT
GMAX
GMIN
Ga1
Ga2
f0=165MHz, unless otherwise specified
Condition
NF
OP1
IMD3
NF
OP1
IMD3
Max.
Unit
300
MHz
Ω
Ω
dB
dB
dB
dB
dB
50
50
30
GCON=2.5V
GCON=0.2V
GCON=2V
GCON =0.5V
21
-6.5
21
-9
0.2
0.5V≦VGCONT≦2.0V
1
GSR
NF
OP1
IMD3
Typ.
90
VGT
GCS
Min.
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dB/V
65
7
5
70
dB
dBm
dBc
65
7
5
70
dB
dBm
dBc
55
7
5
60
dB
dBm
dBc
Gain = 21 dB
Output Level = -15dBm
80
µS
Gain = 21 dB
Output Level = -15dBm
V
5
Gain = 21 dB
Output Level = -15dBm
20
2.5
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[AK1291]
Detector Block
Input Frequency range
FOP２
Output voltage Level 1
Det_H
Output voltage Level 2
Det_L
Temperature
Detvdev
dependency note 2)
Note1) guaranteed monotonicity
Note2) guaranteed by design
100
DETIN=-15dBm
DETIN=-35dBm
Refer to 25°C
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0.5
1.6
0.9
±1
500
2.2
MHz
V
V
dB
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[AK1291]
10. Interface circuit
Pin No Pin Name
2
RFINP
3
RFINN
5
GCON
I/O
I RF input
I
Interface circuit
Analog Input
300Ω
7
BIAS
23
COM
17
RFOUT
I/O Analog Input/Output
300Ω
O RF output
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[AK1291]
Pin No. Pin Name
8
ENAB
9
TEST1
10
TEST2
I/O
Interface Circuit
I Digital input Pull-Down
300Ω
100kΩ
11
TEST3
12
TEST4
13
TEST5
14
DETOUT
O Digital output
O Output
300Ω
15
DETIN
I
RF input
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11. Evaluation Board Schimatic
VDD
0.1uF
1nF
VDD
1nF
0.1uF
IINPUT
10nF
VDD
0.1uF
VSS4
OAVDD
VSS5
IAVDD
VSS6
COM
1nF
VSS1
VSS3
RFINP
RFOUT
10nF
IOUTPUT
VDD
RFINN
DETVDD
PVDD
DETIN
GCON
DETOUT
VSS2
TEST5
10nF
1nF
0.1uF
Detector
INPUT
1nF
10nF
TEST4
TEST3
TEST2
TEST1
ENAB
BIAS
51Ω
Detector
OUTPUT
10pF
Gain
Control
VDD
Figure. 3 Typical Evaluation Board Schimatic
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[AK1291]
12. Detection of the output signal level
To detect the output power , connect “RFOUT” to “DETIN” via register.
The value of register varies depending on the detection level.
Circuit schematic and the value of register are shown in figure 4.
10nF
IOUTPUT
RFOUT
VDD
DETVDD
Rd
1nF
0.1uF
DETIN
DETOUT
10pF
Detect Rage
-35 to -15dBm
Rd
0Ω
-30 to -10dBm
-25 to -5dBm
-20 to -0dBm
820Ω
2.2kΩ
4.7kΩ
Figure. 4 Circuit schematic of VGA output and detector input
Figure. 5 DETOUT vs Output Power@RFOUT
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13. Typical Performance
Unless otherwise noted,
PVDD=OAVDD=IAVDD=DETVDD=5V, Ta=25℃, Freq=165MHz
1. Gain vs Analog Controll Voltage
Figure.6-1 Gain VS Control Voltage(fo=100MHz)
Figure.6-1 Gain VS Control Voltage(fo=165MHz)
Figure.6-1 Gain VS Control Voltage(fo=300MHz)
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2. Noise Figure
Figure.7-1 NF VS Gain
Figure.7-2 NF VS Gain (fo=165MHz)
(Temp =25°C)
3. IMD3
Figure.7-1 IMD3 VS Gain
Figure.7-2 IMD3 VS Gain
(Temp =25°C)
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[AK1291]
14. Marking
(a) Style
:
QFN
(b) Number of pins
:
24
(c) 1 pin marking:
○
(d) Product number
:
1291
(e) Date code
:
YWWL (4 digits)
Y:
Lower 1 digit of calendar year (Year 2013 → 3, 2014 → 4 ...)
WW:
Week
L:
Lot identification, given to each product lot which is made in a
week
 LOT ID is given in alphabetical order (A, B, C…).
1291
YWWL
(d)
(e)
●(c)
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[AK1291]
15. Outer Dimensions
HWQFN24-4×4-0.5
Note)
The exposed pad at the center of the backside should be connected to ground.
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[AK1291]
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the information contained in
this document without notice. When you consider any use or application of AKM product stipulated in this
document (“Product”), please make inquiries the sales office of AKM or authorized distributors as to current status
of the Products.
1. All information included in this document are provided only to illustrate the operation and application examples of
AKM Products. AKM neither makes warranties or representations with respect to the accuracy or completeness of
the information contained in this document nor grants any license to any intellectual property rights or any other
rights of AKM or any third party with respect to the information in this document. You are fully responsible for use
of such information contained in this document in your product design or applications. AKM ASSUMES NO
LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM THE USE OF
SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require extraordinarily high
levels of quality and/or reliability and/or a malfunction or failure of which may cause loss of human life, bodily
injury, serious property damage or serious public impact, including but not limited to, equipment used in nuclear
facilities, equipment used in the aerospace industry, medical equipment, equipment used for automobiles, trains,
ships and other transportation, traffic signaling equipment, equipment used to control combustions or explosions,
safety devices, elevators and escalators, devices related to electric power, and equipment used in finance-related
fields. Do not use Product for the above use unless specifically agreed by AKM in writing.
3. Though AKM works continually to improve the Product’s quality and reliability, you are responsible for complying
with safety standards and for providing adequate designs and safeguards for your hardware, software and systems
which minimize risk and avoid situations in which a malfunction or failure of the Product could cause loss of human
life, bodily injury or damage to property, including data loss or corruption.
4. Do not use or otherwise make available the Product or related technology or any information contained in this
document for any military purposes, including without limitation, for the design, development, use, stockpiling or
manufacturing of nuclear, chemical, or biological weapons or missile technology products (mass destruction
weapons). When exporting the Products or related technology or any information contained in this document, you
should comply with the applicable export control laws and regulations and follow the procedures required by such
laws and regulations. The Products and related technology may not be used for or incorporated into any products or
systems whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations.
5. Please contact AKM sales representative for details as to environmental matters such as the RoHS compatibility of
the Product. Please use the Product in compliance with all applicable laws and regulations that regulate the inclusion
or use of controlled substances, including without limitation, the EU RoHS Directive. AKM assumes no liability for
damages or losses occurring as a result of noncompliance with applicable laws and regulations.
6. Resale of the Product with provisions different from the statement and/or technical features set forth in this
document shall immediately void any warranty granted by AKM for the Product and shall not create or extend in
any manner whatsoever, any liability of AKM.
7. This document may not be reproduced or duplicated, in any form, in whole or in part, without prior written consent
of AKM.
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