RFSA2654
Serial Con-
trolled 75W
Digital Step
Attenuator
5MHz to
2000MHz, 6-
Bit, 0.5dB LSB
RFSA2654
SERIAL CONTROLLED 75DIGITAL STEP
ATTENUATOR 5MHz TO 2000MHz, 6-BIT, 0.5dB
Package: MCM, 24-Pin, 4.2mm x 4.2mm
DATA
CLK
PUP
NC
LE
24
23
22
21
20
19
NC
Features
GND
VCC
GND
1
2
3
18
GND
GND
GND
Frequency Range 5MHz to
2000MHz
6-Bits, 75, 31.5dB Range,
0.5dB Step
High Linearity, IIP3 >50dBm
3V and 5V Logic Compatible
Serial-to-Parallel Controller
Serial Programming Interface
Power-up Programming Modes
On-chip ESD Protection Class 1C
HBM
Single Supply, 5V Operation
Footprint Compatible with Most
24-Pin, 4mm x 4mm, QFNs
SPI
17
16
15
RF1
GND
GND
4
RF2
GND
GND
5
6
6-Bit DSA
14
13
7
GND
8
GND
9
GND
10
GND
11
GND
12
GND
Functional Block Diagram
Product Description
RFMD's RFSA2654 is a 6-bit, 75 digital step attenuator (DSA) that features high
linearity over the entire 31.5dB gain control range with excellent step accuracy in
0.5dB steps. The RFSA2654 is programmed via a serial mode control interface that
is both 3V and 5V compatible. The RFSA2654 also offers a rugged Class 1C HBM
ESD rating via on-chip ESD circuitry. The MCM package is footprint compatible with
most 24-pin 4mm x 4mm QFN packages.
Applications
CATV/Satellite Set Top Boxes
Cable Modems
CATV Infrastructure
Data Network Equipment
Ordering Information
RFSA2654SQ
RFSA2654SR
RFSA2654TR13
RFSA2654PCK-410
Sample bag with 25 pieces
7” Sample reel with 100 pieces
13” Reel with 2500 pieces
5MHz to 2000MHz 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
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. ©2012, RF Micro Devices, Inc.
DS121031
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 9
RFSA2654
Absolute Maximum Ratings
Parameter
Supply Voltage
DC Supply Current
Power Dissipation
Max RF Input Power
Operating Temperature (T
CASE
)
Storage Temperature
Junction Temperature
ESD Rating (HBM)
Moisture Sensitivity Level
Rating
+5.5
15
83
28.3
-40 to +85
-40 to +150
150
Class 1C
MSL3
Unit
V
mA
mW
dBm
°C
°C
°C
Caution! ESD sensitive device.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may
cause permanent damage to the device. Extended application of Absolute Maximum
Rating conditions to the device may reduce device reliability. Specified typical perfor-
mance or functional operation of the device under Absolute Maximum Rating condi-
tions is not implied.
The information in this publication is believed to be accurate and reliable. However, no
responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any
infringement of patents, or other rights of third parties, resulting from its use. No
license is granted by implication or otherwise under any patent or patent rights of
RFMD. RFMD reserves the right to change component circuitry, recommended appli-
cation circuitry and specifications at any time without prior notice.
RFMD Green: RoHS compliant per EU Directive 2002/95/EC, halogen free
per IEC 61249-2-21, < 1000ppm each of antimony trioxide in polymeric
materials and red phosphorus as a flame retardant, and <2% antimony in
solder.
Nominal Operating Parameters
Parameter
Overall
Frequency Range
Insertion Loss
5
0.69
1.3
1.92
2.21
2.29
Gain Control Range
Step Accuracy
Input IP3
Input P0.5dB
27
Input Return Loss
Output Return Loss
Control Interface
Settling Time
Switching Speed
Supply Voltage (V
DD
)
Supply Current
Control Voltage (V
CTL
)
4.75
11
11
46
31.5
±(0.1 + 5.0% attenuation setting)
52
25
30
17.5
17.5
6-bit, Serial
200
200
5.0
5.7
Low, V
CTL
= 0V to 0.8V
High, V
CTL
= 2.0V to V
DD
Notes:
1. V
DD
= 5V, V
CTL
= 5V, T = 25°C
2. IIP3 measured with P
IN
= +12dBm/tone, 1MHz spacing
5.25
2000
MHz
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dB
dB
bit
ns
ns
V
mA
V
V
30MHz to 2000MHz, all states, tested into
50, minimum at 31.5dbm attenuation
100MHz, all states, tested into 50
200MHz to 2000MHz, 27dBm for 8, 16-bit
Steps, tested into 50
5MHz to 1200MHz, all states
5MHz to 1200MHz, all states
Serial interface
t
RISE
, t
FALL
(10%/90% RF)
t
ON
, t
OFF
(50% CTL to 10%/90% RF)
Typical performance based on 5V operation.
5MHz, 0dB attenuation
880MHz, 0dB attenuation
1200MHz, 0dB attenuation
1880MHz, 0dB attenuation
2000MHz, 0dB attenuation
0.5dB step size
Min.
Specification
Typ.
Max.
Unit
Condition
5V, 25°C, 75, typical condition unless other-
wise stated.
2 of 9
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
DS121031
RFSA2654
Typical Performance - Broadband Application Circuit
Insertion Loss versus Frequency
3.0
Normalized Attenuation versus Frequency
0
-5
-10
Attenuation(dB)
2.5
Insertion Loss (dB)
2.0
-15
-20
-25
-30
-35
0.5dB
4dB
31.5dB
1dB
8dB
2dB
16dB
1.5
-40°C
25°C
0.5
85°C
1.0
0.0
0
500
1,000
Frequency (MHz)
1,500
2,000
0
500
1000
Frequency (MHz)
1500
2000
Input Return Loss versus Frequency
45
40
35
Input Return Loss (dB)
30
25
20
15
10
5
0
0
500
1000
Frequency (MHz)
1500
2000
0dB
1dB
4dB
16dB
0.5dB
2dB
8dB
31.5dB
Output Return Loss (dB)
45
40
35
30
25
20
15
10
5
0
0
Output Return Loss versus Frequency
0dB
1dB
4dB
16dB
0.5dB
2dB
8dB
31.5dB
500
1000
Frequency (MHz)
1500
2000
Relative Phase versus Frequency
50
0.5dB
2dB
8dB
31.5dB
1dB
4dB
16dB
Worst Case Step Error (dB)
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-10
0
500
1000
Frequency (MHz)
1500
2000
-1.00
0
Worst Case Step Error Between
Successive States
40
Relative Phase (Deg)
30
20
10
0
500
1000
Frequency (MHz)
1500
2000
DS121031
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 9
RFSA2654
Typical Performance - Broadband Application Circuit
Major Step Error versus Frequency
1.00
0.75
0.50
0.4
Step Error (dB)
0.25
0.00
-0.25
-0.50
-0.75
-1.00
0
500
1000
Frequency (MHz)
1500
2000
0.5dB
2dB
8dB
31.5dB
1dB
4dB
15.5dB
Step Error (dB)
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0
4
8
12
16
20
Attenuation (dB)
24
28
32
1.0
0.8
0.6
5MHz
800MHz
1800MHz
300MHz
1200MHz
Step Error versus Attenuation
Input IP3 versus Frequency
60
35
Input P0.5dB versus Frequency
55
30
Input IP3 (dBm)
50
Input P0.5dB (dB)
45
0dB
1dB
4dB
16dB
30
0
500
1000
Frequency (MHz)
1500
2000
0.5dB
2dB
8dB
31.5dB
25
0dB
1dB
4dB
16dB
0.5dB
2dB
8dB
31.5dB
40
20
35
15
0
400
800
1200
Frequency (MHz)
1600
2000
4 of 9
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
DS121031
RFSA2654
Serial Port Interface
SPI Timing Diagram
t6
t1
t2
t4
t5
t3
t8
Programming Example - 6-Bit
CLK
DATA
t7
CLK
DATA
LE
t9
MSB
D5
D4
D3
D2
D1
LSB
D0
LE
DOUT
t10
Truth Table
Control Bits
C16
1
1
1
1
1
1
0
0
C8
1
1
1
1
1
0
1
0
C4
1
1
1
1
0
1
1
0
C2
1
1
1
0
1
1
1
0
C1
1
1
0
1
1
1
1
0
C0.5
1
0
1
1
1
1
1
0
Relative Gain
Setting
Max gain
-0.5dB
-1dB
-2dB
-4dB
-8dB
-16dB
-31.5dB
SPI Timing Diagram Specifications
Parameter
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
Limit
25
20
20
5
5
30
5
5
10
20
Unit
MHz max
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
Comment
CLK Frequency
CLK High
CLK Low
DATA to CLK Setup Time
DATA to CLK Hold Time
Data Valid
LE to CLK Setup Time
CLK to LE Setup Time
LE Pulse Width
Output Set
Low
High
Logic Voltage Levels
State
Logic
0V to 0.8V
2.0V to 5.0V
Power-up Programming Truth Table
PUP
Low
High
Attenuator Setting
Attenuation at max, 31.5dB
Attenuation at min, 0dB
DS121031
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 9
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