RFSA2724Par-
allel Controlled
Digital Step
Attenuator,
50 MHz to
400MHz
RFSA2724
Serial Controlled Digital Step Attenuator,
50MHz to 4000MHz
Package: MCM, 24-Pin, 4.2mm x 4.2mm
DATA
PUP
20
NC
CLK
24
23
22
21
Features
NC
19
LE
GND/NC
VDD
GND/NC
RF1
GND/NC
GND/NC
1
18
GND/NC
GND/NC
GND/NC
RF2
GND/NC
GND/NC
Frequency Range 50MHz to
4000MHz
7-Bit, 31.75dB Range, 0.25dB
Step
High Linearity, IP3 > 50dBm
3V and 5V Logic Compatible
Serial-to-Parallel Controller
Serial Programming Interface
Power-up Programming Modes
On-chip ESD Protection Class 2
< 4000V
Single Supply, 3V to 5V Operation
Footprint Compatible with Most
24-Pin, 4mm x 4mm QFNs
2
SPI
17
3
16
4
15
5
7-Bit DSA
14
6
13
7
8
9
10
11
12
GND/NC
GND/NC
GND/NC
GND/NC
Functional Block Diagram
Product Description
RFMD's RFSA2724 is a 7-bit digital step attenuator (DSA) that features high-linear-
ity over the entire 31.75dB gain control range with excellent step accuracy in
0.25dB steps. The RFSA2724 is programmed via a serial mode control interface
that is both 3V and 5V compatible. The RFSA2724 also offers a rugged Class 1B
HBM ESD rating via on-chip ESD circuitry. The MCM package is footprint compatible
with most 24-pin 4mm x 4mm QFN packages.
Applications
Transceiver IF Applications
Cellular, PCS, GSM, UMTS, LTE,
WiMax/WiFi
Wireless Data, Satellite
Terminals
Test Equipment
Ordering Information
RFSA2724SR
RFSA2724SQ
RFSA2724TR13
RFSA2724PCK-410
7” Sample reel with 100 pieces
Sample bag with 25 pieces
13” Reel with 2500 pieces
50MHz to 4GHz PCBA with 5-piece sample bag
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.
DS130212
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
GND/NC
GND/NC
1 of 9
RFSA2724
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)
ESD Rating (CDM)
Moisture Sensitivity Level
Rating
+5.5
15
83
27
-40 to +85
-40 to +150
150
Class 2 (< 4000)
Class IV (> 1000)
MSL3
Unit
V
mA
mW
dBm
°C
°C
°C
V
V
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.
Parameter
Frequency Range
Insertion Loss
Min.
50
Specification
Typ.
0.85
1.1
1.7
2.2
31.75
Max.
4000
Unit
MHz
dB
Condition
150MHz, 0dB attenuation
850MHz, 0dB attenuation
2700MHz, 0dB attenuation
3800MHz, 0dB attenuation
0.25dB step size
100MHz to 4000MHz
1000MHz
DC to 3500MHz, all states
Serial Interface
t
RISE
, t
FALL
(10%/90% RF)
t
ON
, t
OFF
(50% CTL to 10%/90% RF)
Gain Control Range
Step Accuracy
Input IP3
Input P0.1dB
Return Loss
Control Interface
Settling Time
Switching Speed
Supply Voltage (V
DD
)
Supply Current
Control Voltage (V
CTL
)
4.75
dB
dB
dBm
dBm
dB
ns
ns
5.25
V
mA
V
±(0.1 + 5.0% attenuation setting)
50
25
15
7-bit, Serial
200
200
5.0
7.5
Low, V
CTL
= 0V to 0.8V
High, V
CTL
= 2.0 to V
DD
Notes:
1. V
DD
= 5V, V
CTL
= 5V, T = 25°C.
2. IIP3 measured with P
IN
= +10dBm/tone, 1MHz spacing
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.
DS130212
RFSA2724
Typical Performance: Broadband Application Circuit (25°C)
DS130212
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
RFSA2724
Typical Performance: Broadband Application Circuit (25 °C)
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.
DS130212
RFSA2724
Truth Table
Control Bit
C16
1
1
1
1
1
1
1
0
0
C8
1
1
1
1
1
1
0
1
0
C4
1
1
1
1
1
0
1
1
0
C2
1
1
1
1
0
1
1
1
0
C1
1
1
1
0
1
1
1
1
0
C0.5
1
1
0
1
1
1
1
1
0
C0.25
1
0
1
1
1
1
1
1
0
Relative Gain
Setting
Max gain
-0.25dB
-0.5dB
-1dB
-2dB
-4dB
-8dB
-16dB
-31.75dB
Note: C0.25 = D0, C0.5 = D1, …, C16 = D6 (for the purpose of the example below)
Serial Port Interface
SPI Timing Diagram
t6
t1
t2
t4
t5
t3
t8
Programming example – 7 bit
CLK
DATA
LE
MSB
D6
D5
D4
D3
D2
D1
LSB
D0
CLK
DATA
t7
LE
t9
DOUT
t10
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 max
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
Logic Voltage Levels
State
Low
High
Logic
0V to 0.8V
2.0V to 5.0V
DS130212
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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