RFSA2614Par-
allel Controlled
Digital Step
Attenuator
50MHz to
4000MHz, 6-
Bit, 0.5dB LSB
RFSA2614
PARALLEL CONTROLLED DIGITAL STEP
ATTENUATOR 50MHz TO 4000MHz, 6-BIT, 0.5dB
Package: QFN, 24-Pin, 4mm x 4mm
C0.5
C1
C4
24
23
22
21
C8
20
C2
Features
N/C
Vcc
N/C
RF1
N/C
N/C
1
C16
19
18
N/C
N/C
N/C
RF2
N/C
ACG6
Frequency Range 50MHz to
4000MHz
6 Bits, 31.5dB Range, 0.5dB
Step
High Linearity, IIP3 >49dBm
3V and 5V Logic Compatible
On-chip Parallel Decoder
Parallel Programming Interface
On-chip ESD Protection >500V
HBM
Single Supply, 3V to 5V Operation
2
3
Logic Cir cuit
17
16
4
15
6 Bit DSA
5
14
6
13
7
8
9
10
11
12
ACG3
ACG4
ACG5
ACG1
Functional Block Diagram
Applications
Product Description
The RFSA2614 is a 6-bit 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 parallel-controlled RFSA2614 has an on-chip decoder that is both 3V
and 5V compatible. It also offers a rugged Class 1B HBM ESD rating via on-chip
ESD circuitry.
Transceiver RF and IF
Applications
Cellular, PCS, GSM, UMTS, LTE,
WiMax/WiFi
Wireless Data, Satellite
Terminals
Test Equipment
Ordering Information
RFSA2614SR
RFSA2614SQ
RFSA2614TR7
RFSA2614TR13
RFSA2614PCK-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
ACG2
GaAs pHEMT
Si CMOS
Si BJT
N/C
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.
DS120706
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
RFSA2614
Absolute Maximum Ratings
Parameter
Supply Voltage
DC Supply Current
DC 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
MSL1
Unit
V
DC
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.
1.6
1.7
2.1
2.2
2.8
Max.
4000
1.9
Unit
MHz
dB
dB
dB
Condition
500MHz, 0dB attenuation
850MHz, 0dB attenuation
2140MHz, 0dB attenuation
2700MHz, 0dB attenuation
3800MHz, 0dB attenuation
0.5dB step size
700MHz to 2700MHz, states 0 thru 27.5dB
700MHz to 2700MHz, states 28 thru 31.5dB
700MHz to 2700MHz, all states
700MHz to 2700MHz, all states
Parallel interface
t
RISE
, t
FALL
(10%/90% RF)
t
ON
, t
OFF
(50% CTL to 10%/90% RF)
Typical performance based on 5V opreation.
Low
High
2.8
dB
dB
dB
dB
dBm
dBm
dBm
dB
bit
ns
ns
Gain Control Range
Step Accuracy
IIP3
IIP3
Input P1dB
Return Loss
Control Interface
Settling Time
Switching Speed
Supply Voltage (V
DD
)
Supply Current
Control Voltage (V
CTL
)
0
2.0
3.0
31.5
±(0.15 + 5.0% attenuation setting)
>49
>45
>27
>18
6
200
200
5.0
3.5
0.8
V
DD
5.25
V
mA
V
V
Notes:
1. V
DD
= 5V, V
CTL
= 3V, T = 25°C
2. Broadband Application Circuit (with ACG capacitors)
3. IIP3 measured with 1MHz spacing, P
IN
= 4dBm/tone for frequency < 300MHz, P
IN
= 10dBm/tone for frequency > 300MHz
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.
DS120706
RFSA2614
Typical Broadband Application Circuit Performance
(with ACG capacitors)
Gain versus Frequency, Reference State (0dB)
0.0
-0.5
-1.0
85C
25C
-40C
Normalized Attenuation, Major States
0.0
-5.0
-10.0
S21 (dB)
S21 (dB)
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
-15.0
-20.0
-25.0
-30.0
-35.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.5dB
2dB
8dB
31.5dB
1dB
4dB
16dB
Frequency (GHz)
Frequency (GHz)
RF1 RL versus Frequency, Major States
0
0dB
1dB
0.5dB
2dB
RF2 RL versus Frequency, Major States
0
0dB
1dB
0.5dB
2dB
8dB
31.5dB
-5
4dB
16dB
8dB
31.5dB
-5
4dB
16dB
-10
-10
-15
S22 (dB)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
S11 (dB)
-15
-20
-20
-25
-25
-30
-30
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency (GHz)
Frequency (GHz)
Relative Phase, Major States
60
50
40
Input IP3 versus Frequency, All States, 25C
60
0.5dB
2dB
8dB
31.5dB
1dB
4dB
16dB
55
20
10
0
IIP3 (dBm)
S21 (dB)
30
50
45
States 28 thru 31.5dB
40
-10
-20
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
35
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
Frequency (GHz)
DS120706
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
RFSA2614
Typical Broadband Application Circuit Performance
(with and without ACG capacitors)
2.0
1.5
1.0
0.5
Worst Case Step Error between Successive States
(w/ACG caps)
2.0
1.5
1.0
0.5
Worst Case Step Error between Successive States
(no ACG caps)
Step Error (dB)
0.0
-0.5
-1.0
-1.5
-2.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Step Error (dB)
0.0
-0.5
-1.0
-1.5
-2.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency (GHz)
Frequency (GHz)
Step Error versus Frequency, All States (w/ACG caps)
2.0
1.5
1.0
0.5
2.0
1.5
1.0
0.5
Step Error versus Frequency, All States (no ACG caps)
Step Error (dB)
0.0
-0.5
-1.0
-1.5
-2.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Step Error (dB)
0.0
-0.5
-1.0
-1.5
-2.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency (GHz)
Frequency (GHz)
Step Error versus Attenuation (w/ACG caps)
2.0
1.5
1.0
0.5
0.0
-0.5
450 MHz
150 MHz
1 GHz
2.7 GHz
3.8 GHz
Step Error versus Attenuation (no ACG caps)
2.0
1.5
1.0
0.5
0.0
-0.5
850 MHz
1 GHz
Step Error (dB)
-1.0
-1.5
-2.0
0
4
Step Error (dB)
850 MHz
2 GHz
3.3 GHz
-1.0
2 GHz
2.7 GHz
-1.5
-2.0
3.3 GHz
3.8 GHz
8
12
16
20
24
28
32
0
4
8
12
16
20
24
28
32
Attenuation State (dB)
Attenuation State (dB)
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.
DS120706
RFSA2614
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
Logic Voltage Levels
State
Low
High
Logic
0V to 0.8V
2.0V to 5.0V
DS120706
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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