RFSA4023
TEMPERATURE COMPENSATING ATTENUATOR
Package: QFN, 16-Pin, 0.9mmx3mmx3mm
VDD
GND
16
GND
15
14
Features
GND
1
CONTROL
BLOCK
GND
13
12
GND
Patent Pending Circuit
Architecture
Broadband 50MHz to 6000MHz
Frequency Range
3 Selectable Attenuation versus
Temperature Slopes
+55dBm IIP3 Typical
+85dBm IIP2 Typical
High 1dB Compression Point
>+30dBm
Low Supply Current 1mA Typical
3.3V Power Supply
Class 1C ESD ( 1000V )
Complete Solution in a Small
3mmx3mm QFN Package
5V Part Available - RFSA4013
NC
2
11
NC
RFIN
3
ATTEN
10
RFOUT
NC
4
9
NC
5
GND
6
MODE1
7
MODE2
8
GND
Functional Block Diagram
Product Description
RFMD's RFSA4023 is a fully monolithic analog temperature compensating attenuator (TCA) fea-
turing exceptional linearity over its entire gain control range. It is designed to offset the gain
reduction of an RF component over temperature without the need for closed loop feedback.
Three customer selectable temperature coefficients make it a flexible solution for RF lineups. It
incorporates revolutionary new circuit architecture to solve a long standing industry problem
with regards to attenuator architecture: high IP3, low DC current and broad bandwidth. Tradi-
tional approaches for solving this problem require expensive co-fired ceramics with tempera-
ture sensitive materials or current hungry PIN diodes with elaborate area consuming control
circuits. This temperature compensating attenuator requires only a single supply voltage and
two logic bits to set control attenuation slope versus temperature. The RFSA4023 draws a very
low 1mA current and is packaged in a small 3mmx3mm QFN. This attenuator is matched to
50 over its rated control range and frequency with no external matching components
required.
Applications
Cellular, 3G Infrastructure
WiBro, WiMax, LTE
Microwave Radio
High-Linearity Level Control
Ordering Information
RFSA4023SQ
RFSA4023SR
RFSA4023TR7
RFSA4023PCK-410
Sample bag with 25 pieces
7” Sample reel with 100 pieces
7” Reel with 2500 pieces
50MHz to 6000MHz PCBA with 5-piece sample bag
Optimum Technology Matching® Applied
GaAs HBT
GaAs MESFET
InGaP HBT
SiGe BiCMOS
Si BiCMOS
SiGe HBT
GaAs pHEMT
Si CMOS
Si BJT
GaN HEMT
BiFET HBT
LDMOS
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-
mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.
DS140117
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
1 of 14
RFSA4023
Absolute Maximum Ratings
Parameter
Supply Voltage (V
DD
)
Mode Pin Voltage (MODE 1)
Mode Pin Voltage (MODE 2)
RF Input Power
Operating Temperature
Storage Temperature
Maximum Junction Temperature
ESD - Human Body Model (HBM)
Rating
-0.5 to +4
-0.5 to +4
-0.5 to +4
+30
-40 to +85
-65 to +150
+125
1000
Unit
V
V
V
dBm
°C
°C
°C
V
Parameter
General
Supply Voltage (V
DD
)
Supply Current
Operating Temperature
Thermal Resistance
RF Input Power
Min.
3
-40
Specification
Typ.
3.3
1
Max.
3.5
85
Unit
V
mA
°C
°C/W
dBm
MHz
dB/°C
dB/°C
dB/°C
dB
dB
dB
Deg
dB
dBm
dBm
dBm
dBm
dBm
P
IN
+(IM3
dBC
/2)
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
Condition
45
27
50
0.045
0.058
0.066
5.6
6.70
7.85
3
20
30
45
55
85
87
58
+0.4
1
6000
RF Performance
Frequency Range
Attenuation Slope
Mode1=Low Mode2=High
Attenuation Slope
Mode1=High Mode2=High
Attenuation Slope
Mode1=High Mode2=Low
Nominal +25°C Attenuation
Mode1=Low Mode2=High
Nominal +25°C Attenuation
Mode1=High Mode2=High
Nominal +25°C Attenuation
Mode1=High Mode2=Low
Relative Phase
Return Loss
Input 1dB Compression Point
Input IP3
Input IP2
Input IH2
Input IH3
Insertion Phase at +25°C temperature relative
to max temperature
P
IN
+IM2
dBC
, IM2 is F1+F2
P
IN
+H2
dBC
, H2 is Second Harmonic
P
IN
+(H3
dBC
/2), H3 is Third Harmonic
Power Supply
MODE pin Logic Low
MODE pin Logic High
V
V
NOTE: Typical performance at nominal conditions unless otherwise noted: Supply voltage=3.3V, Operating temperature=25°C, RF frequency
2GHz
2 of 14
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
DS140117
RFSA4023
Measured Performance
Insertion Loss versus Temperature
RF 2GHz, V
DD
=3.3V
0
-2
-4
0
-2
-4
Insertion Loss versus Frequency
Mode 1=High, Mode 2=Low, V
DD
=3.3V
Insertion Loss (dB)
Insertion Loss (dB)
Mode1=High Mode2=Low
Mode1=High Mode2=High
-6
-8
-10
-12
-14
-16
-18
-20
-60
-40
-20
0
20
40
60
80
100
-6
-8
-10
-12
-14
-16
-18
-20
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Mode1=Low Mode2=High
Temperature (°C)
Frequency (GHz)
Insertion Loss versus Frequency
Mode 1=High, Mode 2=High, V
DD
=3.3V
0
-2
-4
0
-2
-4
Insertion Loss versus Frequency
Mode 1=Low, Mode 2=High, V
DD
=3.3V
Insertion Loss (dB)
-8
-10
-12
-14
-16
-18
-20
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Insertion Loss (dB)
-6
-6
-8
-10
-12
-14
-16
-18
-20
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Frequency (GHz)
Frequency (GHz)
Input Return Loss versus Temperature
RF 2GHz, V
DD
=3.3V
0
-5
-10
0
-5
-10
Input Return Loss versus Frequency
Mode 1=High, Mode 2=Low, V
DD
=3.3V
Input Return Loss (dB)
Input Return Loss (dB)
Mode1=High Mode2=Low
Mode1=High Mode2=High
-15
-20
-25
-30
-35
-40
-45
-50
-60
-40
-20
0
20
40
60
80
100
-15
-20
-25
-30
-35
-40
-45
-50
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Mode1=Low Mode2=High
Temperature (°C)
Frequency (GHz)
DS140117
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
3 of 14
RFSA4023
Measured Performance
Input Return Loss versus Frequency
Mode 1=High, Mode 2=High, V
DD
=3.3V
0
-5
-10
0
-5
-10
Input Return Loss versus Frequency
Mode 1=Low, Mode 2=High, V
DD
=3.3V
Input Return Loss (dB)
-15
-20
-25
-30
-35
-40
-45
-50
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Input Return Loss (dB)
-15
-20
-25
-30
-35
-40
-45
-50
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Frequency (GHz)
Frequency (GHz)
Output Return Loss versus Temperature
RF 2GHz, V
DD
=3.3V
0
-5
-10
0
-5
-10
Output Return Loss versus Frequency
Mode 1=High, Mode 2=Low, V
DD
=3.3V
Output Return Loss (dB)
Output Return Loss (dB)
Mode1=High Mode2=Low
Mode1=High Mode2=High
-15
-20
-25
-30
-35
-40
-45
-50
-60
-40
-20
0
20
40
60
80
100
-15
-20
-25
-30
-35
-40
-45
-50
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Mode1=Low Mode2=High
Temperature (°C)
Frequency (GHz)
Output Return Loss versus Frequency
Mode 1=High, Mode 2=High, V
DD
=3.3V
0
-5
-10
0
-5
-10
Output Return Loss versus Frequency
Mode 1=Low, Mode 2=High, V
DD
=3.3V
Output Return Loss (dB)
-15
-20
-25
-30
-35
-40
-45
-50
0
1
2
3
4
5
6
-40°C
0°C
40°C
80°C
-20°C
20°C
60°C
Output Return Loss (dB)
-15
-20
-25
-30
-35
-40
-45
-50
0
1
2
3
4
5
6
-40°C
20°C
80°C
-20°C
40°C
0°C
60°C
Frequency (GHz)
Frequency (GHz)
4 of 14
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
DS140117
RFSA4023
Measured Performance
Input IP3 versus Temperature
RF 2GHz, V
DD
=3.3V, Pin=+20dBm/Tone
70
70
Input IP3 versus Attenuation
RF 2GHz, V
DD
=3.3V, Pin=+20dBm/Tone
60
60
50
50
Input IP3 (dBm)
Input IP3 (dBm)
40
40
30
30
20
Mode1=High Mode2=Low
10
Mode1=High Mode2=High
Mode1=Low Mode2=High
0
-60
-40
-20
0
20
40
60
80
100
20
Mode1=High Mode2=Low
10
Mode1=High Mode2=High
Mode1=Low Mode2=High
0
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
Temperature (°C)
Attenuation (dB)
Input IP3 versus Temperature
V
DD
=3.3V, Mode 1=High, Mode 2=Low, Pin=+20dBm/Tone
70
70
Input IP3 versus Temperature
V
DD
=3.3V, Mode 1=High, Mode 2=High, Pin=+20dBm/Tone
60
60
50
50
Input IP3 (dBm)
40
Input IP3 (dBm)
50MHz
500MHz
2000MHz
4000MHz
40
30
30
20
1000MHz
3000MHz
0
-60
-40
-20
0
20
40
60
80
100
20
50MHz
10
1000MHz
3000MHz
0
-60
-40
-20
0
20
40
60
80
100
500MHz
2000MHz
4000MHz
10
Temperature (°C)
Temperature (°C)
Input IP3 versus Temperature
V
DD
=3.3V, Mode 1=Low, Mode 2=High, Pin=+20dBm/Tone
70
60
50
Input IP3 (dBm)
40
30
20
50MHz
10
1000MHz
3000MHz
0
-60
-40
-20
0
20
40
60
80
100
500MHz
2000MHz
4000MHz
Temperature (°C)
DS140117
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
5 of 14
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