RFSA2624
Serial Con-
trolled Digital
Step Attenua-
toR 50MHz to
4000MHz, 6-
Bit, 0.5dB LSB
RFSA2624
SERIAL CONTROLLED DIGITAL STEP
ATTENUATOR 50MHz to 4000MHz, 6-BIT, 0.5dB
Package: MCM, 24-Pin, 4.2mm x 4.2mm
Features
Frequency Range 50MHz to
4000MHz
6-Bits, 31.5dB Range, 0.5dB
Step
High Linearity, OIP3 >48dBm
through over 700MHz to
2700MHz
3V and 5V Logic Compatible
Serial-to-Parallel Controller
Serial Programming Interface
Power-up Programming Modes
On-chip ESD Protection >500V
HBM
Single Supply, 3V to 5V Operation
Footprint compatible with most
24-pin, 4mm QFNs
Functional Block Diagram
Product Description
RFMD’s RFSA2624 is a 6-bit digital step attenuator (DSA) that features high linear-
ity over the entire 31.5dB gain control range with excellent step accuracy in 0.5dB
steps. The RFSA2624 is programmed via a serial mode control interface that is
both 3V and 5V compatible. The RFSA2624 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, QFN packages.
Applications
Transceiver IF Applications
Cellular, PCS, GSM, UMTS, LTE,
WiMax/WiFi
Wireless Data, Satellite
Terminals
Test Equipment
Ordering Information
RFSA2624SR
RFSA2624SQ
RFSA2624TR7
RFSA2624TR13
RFSA2624PCK-410
7” Reel with 100 pieces
Sample bag with 25 pieces
7” Reel with 750 pieces
13” Reel with 2500 pieces
50MHz to 4000MHz 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.
DS110706
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
RFSA2624
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
27
-40 to +85
-40 to +150
150
Class 1B
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.
Parameter
Frequency Range
Insertion Loss
Min.
50
Specification
Typ.
1.5
1.7
2.3
2.5
Max.
4000
1.9
2.8
Unit
MHz
dB
dB
dB
dB
dB
dB
dBm
dBm
dB
bit
nS
nS
Condition
150MHz, 0dB attenuation
850MHz, 0dB attenuation
2700MHz, 0dB attenuation
3800MHz, 0dB attenuation
0.5dB step size
700MHz to 2700MHz, all states
700MHz to 2700MHz, all states
700MHz to 2700MHz, 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 (0 - 15.5dB states)
Input P1dB
Return Loss
Control Interface
Settling Time
Switching Speed
Supply Voltage (V
DD
)
Supply Current
Control Voltage (V
CTL
)
0
2.0
4.75
31.5
±(0.15 + 5.0% attenuation setting)
48
27
13
6
250
250
5.0
5
0.8
V
DD
5.25
V
mA
V
V
Low
High
Notes:
1. V
DD
= 5V, V
CTL
= 3V, T = 25°C
2. Broadband Application Circuit (with ACG capacitors)
3. 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.
DS110706
RFSA2624
Typical Performance - Broadband Application Circuit (25°C)
Insertion Loss (De-embedded)
0.0
-0.5
Insection Loss (dB)
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
0.0
0.5
1.0
1.5
2.0
2.5
Frequency (GHz)
3.0
3.5
4.0
25C
-40C
85C
Normalized Attenuation, MajorStates
0
-5
-10
Attenuation (dB)
-15
-20
-25
-30
-35
-40
0.0
0.5
1.0
1.5
2.0
2.5
Frequency (GHz)
3.0
3.5
4.0
0.5
2
8
31.5
1
4
16
Return Loss of RF1, MajorStates
0
-5
Return Loss (dB)
-10
-15
-20
-25
-30
-35
-40
0
0.5
1
1.5
2
2.5
Frequency (GHz)
3
3.5
4
0
1
4
16
0.5
2
8
31.5
Return Loss of RF2, MajorStates
0
-5
Return Loss (dB)
-10
-15
-20
-25
-30
-35
-40
0
0.5
1
1.5
2
2.5
Frequency (GHz)
3
3.5
4
0
1
4
16
0.5
2
8
31.5
Step Error, MajorStates
0.8
0.6
0.8
0.6
Step Error vs. Attenuation State
Step Error (dB)
0.2
0.0
-0.2
-0.4
-0.6
-0.8
0
0.5
1
1.5
2
2.5
Frequency (GHz)
3
3.5
4
0.5
2
8
31.5
1
4
16
Step Error(dB)
0.4
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
0
4
8
12
16
20
24
28
32
50MHz
1GHz
3GHz
500MHz
2GHz
4GHz
Attenuation (dB)
DS110706
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
RFSA2624
Typical Performance - Broadband Application Circuit (25°C)
(Continued)
Relative Phase, MajorStates
60
50
Relative Phase (deg)
40
30
20
10
0
-10
-20
0
0.5
1
1.5
2
2.5
Frequency (GHz)
3
3.5
4
0.5
2
8
31.5
1
4
16
0.8
0.6
0.4
Worst Case Successive Step Error
Error(dB)
0.2
0.0
-0.2
-0.4
-0.6
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency(GHz)
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.
DS110706
RFSA2624
Truth Table
Control Bit
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
Note: C 0.5 = D0, C1 = D1, ... C16 = D5 (for the purpose of the example below)
Serial Port Interface
t6
t1
t2
t4
t5
t3
t8
SPI Timing Diagram
Programming example – 6-bit
CLK
DATA
t7
CLK
DATA
LE
MSB
D5
D4
D3
D2
D1
LSB
D0
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 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
LOGIC Voltage Levels
State
Low
High
Logic
0V to 0.8V
2.0V to 5.0V
DS110706
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
MEMS传感器
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
