SKY12361-350LF - Skyworks Solutions, Inc.

DATA SHEET
SKY12361-350LF: 0.1 to 3.7 GHz Four-Bit Digital Attenuator
(1 dB LSB)
Applications
RF2
 Cellular, 3G/4G, WiMAX, and LTE Infrastructures
 RF and IF systems
8 dB
V1
Features
 Broadband operation: 0.1 to 3.7 GHz
 Attenuation: 15 dB with 1 dB LSB
 +5 V supply voltage and +3.3 V control voltage
4 dB
V2
 Small, QFN (16-pin, 3 x 3 mm) package (MSL1, 260 C per
JEDEC J-STD-020)
Skyworks GreenTM products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of GreenTM, document number
SQ04–0074.
2 dB
V3
1 dB
V4
S2242
RF1
V4
V3
V2
V1
Figure 1. SKY12361-350LF Block Diagram
16
15
14
13
Description
RF1
2
11
RF2
N/C
3
10
N/C
RFGND1
4
9
N/C
5
6
7
8
RFGND4
N/C
N/C
12
RFGND3
1
RFGND2
VDD
S2243
Figure 2. SKY12361-350LF Pinout – 16-Pin QFN
(Top View)
The SKY12361-350LF is a GaAs pHEMT four-bit broadband digital
attenuator with a 1 dB least significant bit (LSB). The attenuator
features low insertion loss, excellent attenuation accuracy, a
15 dB attenuation range, and high linearity performance. The
SKY12361-350LF is an ideal choice for a wide variety of cellular
3G and 4G infrastructure applications.
Attenuation is controlled by four DC control pins (V1, V2, V3, and
V4). Depending on the control bias, the attenuation state between
the RF1 and RF2 pins can vary between a low insertion loss state
or up to 15 dB.
The device is provided in a 3 x 3 mm, 16-pin Quad Flat No-Lead
(QFN) package. A functional block diagram is shown in Figure 1.
The pin configuration and package are shown in Figure 2. Signal
pin assignments and functional pin descriptions are provided in
Table 1.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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1
DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
Table 1. SKY12361-350LF Signal Descriptions
Pin
Name
Description
Pin
Name
Description
1
VDD
DC power supply
9
N/C
No connection. Can be grounded without
affecting performance.
2
RF1
RF input/output to digital attenuator
10
N/C
No connection. Can be grounded without
affecting performance.
3
N/C
No connection. Can be grounded without
affecting performance.
11
RF2
RF input/output to digital attenuator
4
RFGND1
Connect through external capacitor to
ground. Capacitor value determines lower
frequency operation of attenuator.
12
N/C
No connection. Can be grounded without
affecting performance.
5
RFGND2
Connect through external capacitor to
ground. Capacitor value determines lower
frequency operation of attenuator.
13
V1
DC control pin. See Table 4.
6
RFGND3
Connect through external capacitor to
ground. Capacitor value determines lower
frequency operation of attenuator.
14
V2
DC control pin. See Table 4.
7
N/C
No connection. Can be grounded without
affecting performance.
15
V3
DC control pin. See Table 4.
8
RFGND4
Connect through external capacitor to
ground. Capacitor value determines lower
frequency operation of attenuator.
16
V4
DC control pin. See Table 4.
Electrical and Mechanical Specifications
Typical performance characteristics of the SKY12361-350LF are
illustrated in Figures 3 through 8.
The absolute maximum ratings of the SKY12361-350LF are
provided in Table 2. Electrical specifications are provided in
Table 3.
The state of the SKY12361-350LF is determined by the logic
provided in Table 4.
Table 2. SKY12361-350LF Absolute Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Units
6.0
V
Supply voltage
VDD
3.3
Control voltage
VCTL
0
RF input power
PIN
VDD
V
+30
dBm
Operating temperature
TOP
–40
+105
C
Storage temperature
TSTG
–40
+125
C
Thermal resistance
RTH
50 (IL state)
C/W
Electrostatic discharge:
ESD
1000
500
100
V
V
V
Charged Device Model (CDM), Class C3
Human Body Model (HBM), Class 1B
Machine Model (MM), Class A
Note:
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.
CAUTION: Although this device is designed to be as robust as possible, electrostatic discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202874A
DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
Table 3. SKY12361-350LF Electrical Specifications (Note 1) (1 of 2)
(VDD = 5 V, VCTL = 3.3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
0.8
1.0
1.2
1.0
1.2
1.4
dB
dB
dB
15
dB
RF Specifications
Insertion loss (Note 2)
IL
Attenuation range
@ 0.7 GHz
@ 1.9 GHz
@ 2.7 GHz
0.1 to 3.7 GHz
1
Return loss
RL
0.1 to 2.7 GHz
Attenuation accuracy
Attn
1 dB bit:
0.7 GHz
1.9 GHz
2.7 GHz
0.8
0.8
0.8
1
1
1
1.2
1.2
1.3
dB
dB
dB
2 dB bit:
0.7 GHz
1.9 GHz
2.7 GHz
1.8
1.8
1.8
2.0
2.1
2.1
2.2
2.3
2.4
dB
dB
dB
4 dB bit:
0.7 GHz
1.9 GHz
2.7 GHz
3.8
3.8
3.8
4.0
4.1
4.1
4.3
4.4
4.4
dB
dB
dB
8 dB bit:
0.7 GHz
1.9 GHz
2.7 GHz
8.0
8.0
7.9
8.2
8.2
8.3
8.4
8.4
8.6
dB
dB
dB
Max. attenuation (15 dB):
0.7 GHz
1.9 GHz
2.7 GHz
15.0
14.9
14.4
15.4
15.3
14.8
15.7
15.6
15.2
dB
dB
dB
0.1 dB input compression point
IP0.1dB
VDD = 3 V @ 2.7 GHz
VDD = 5 V @ 2.7 GHz
Third order input intercept point
IIP3
PIN = +10 dBm/tone @ 2.7 GHz, ΔF
= 1 MHz, worst case in 16 states:
15
VDD = 3 V
VDD = 5 V
dB
+27
+29
dBm
dBm
+45
+47
dBm
dBm
DC Specifications
Control voltage:
Low
High
VCTL
Supply voltage
VDD
Supply current
IDD
VDD = 3.3 V
40
μA
Control current
ICTL
VDD = 3.3 V
5
μA
On/rise
50% control to 90% RF
15
ns
Off/fall
50% control to 10% RF
30
ns
Settling time, 50% RF settled to
within 0.2 dB of final settled value
Insertion loss state
300
ns
0.8
VDD
0
3.3
3.3
5.0
5.5
V
V
V
Switching Speed Specifications
Note 1: Performance is guaranteed only under the conditions listed in this table.
Note 2: Application board insertion loss has been removed from measurement.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
Typical Performance Characteristics
(VDD = 5 V, VCTL = 3.3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [Zo] = 50 Ω, Unless Otherwise Noted)
0
0
+105 °C
+85 °C
–40 °C
+25 °C
–0.2
–0.4
–0.6
–10.0
10 dB
9 dB
8 dB
7 dB
6 dB
5 dB
dB
dB
dB
dB
dB
4 dB
3 dB
2 dB
1 dB
Insertion Loss
–0.8
–1.0
Return Loss (dB)
Insertion Loss (dB)
15
14
13
12
11
–5.0
–1.2
–1.4
–1.6
–15.0
–20.0
–25.0
–1.8
–30.0
–2.4
Applications Board Insertion Loss has been removed from the measurement
–2.6
0.0E+00 5.0E+08 1.0E+09 1.5E+09 2.0E+09 2.5E+09
–35.0
Y0942
–2.2
3.0E+09
3.5E+09
Y0943
–2.0
–40.0
0.0E+00
4.0E+09
5.0E+08
1.0E+09
1.5E+09
2.5E+09
3.0E+09
3.5E+09
4.0E+09
Figure 4. Input Return Loss vs Frequency and Bit State
Figure 3. Insertion Loss vs Frequency and Temperature
0
0
15
14
13
12
11
–5.0
10 dB
9 dB
8 dB
7 dB
6 dB
5 dB
dB
dB
dB
dB
dB
4 dB
3 dB
2 dB
1 dB
Insertion Loss
15 dB
14 dB
13 dB
12 dB
11 dB
10dB
9 dB
8 dB
7 dB
6 dB
5 dB
4 dB
3 dB
2 dB
1 dB
Normalized IL
–2.0
–4.0
Attenuation (dB)
–10.0
Return Loss (dB)
2.0E+09
Frequency (GHz)
Frequency (GHz)
–15.0
–20.0
–6.0
–8.0
–10.0
–25.0
–12.0
–30.0
Y0945
–14.0
Y0944
–35.0
–16.0
0.0E+00
–40.0
0.0E+00
5.0E+08
1.0E+09
1.5E+09
2.0E+09
2.5E+09
3.0E+09
3.5E+09
5.0E+08
1.0E+09
1.5E+09
2.5E+09
3.0E+09
3.5E+09
4.0E+09
Frequency (Hz)
Frequency (Hz)
Figure 6. Normalized Attenuation vs Frequency
Figure 5. Output Return Loss vs Frequency and Bit State
2.00
+1.8
700 MHz
900 MHz
1800 MHz
2100 Mhz
2700 MHz
3000 MHz
3500 MHz
3700 MHz
+1.4
+1.2
+1.0
+0.8
700 MHz
900 MHz
1800 MHz
2100 MHz
2700 MHz
3000 MHz
3500 MHz
3700 MHz
1.80
1.60
1.40
Step Error (dB)
+1.6
Attenuation Error (dB)
2.0E+09
4.0E+09
+0.6
+0.4
+0.2
1.20
1.00
0.80
0.0
0.60
–0.2
Y0946
–0.6
–0.8
–1.0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Attenuation (dB)
Figure 7. Attenuation Error vs Attenuation Setting
14
15
Y0947
0.40
–0.4
0.20
0
0
1
2
3
4
5
6
7
8
9
10
11
Figure 8. Step Error vs Attenuation Setting
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4
12
Attenuation Setting (dB)
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14
15
DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
Table 4. SKY12361-350LF Truth Table
RF1/RF2 (Pins 2 and 11)
Attenuation
V4
(Pin 16)
V3
(Pin15)
V2
(Pin 14)
V1
(Pin 13)
Insertion loss
1
1
1
1
1 dB
0
1
1
1
2 dB
1
0
1
1
4 dB
1
1
0
1
8 dB
1
1
1
0
15 dB
0
0
0
0
Notes: “1” = high control voltage: +3.3 to VDD.
“0” = low control voltage: 0 to +0.8 V.
This table shows the logic required for the major bits and full attenuation. Bit states need to be used in combination to set the sum of the bits selected.
Evaluation Board Description
Package and Handling Information
The SKY12361-350LF Evaluation Board is used to test the
performance of the SKY12361-350LF digital attenuator. An
assembly drawing for the Evaluation Board is shown in Figure 9
and an Evaluation Board schematic diagram is shown in
Figure 10.
Instructions on the shipping container label regarding exposure to
moisture after the container seal is broken must be followed.
Otherwise, problems related to moisture absorption may occur
when the part is subjected to high temperature during solder
assembly.
Package Dimensions
The SKY12361-350LF is rated to Moisture Sensitivity Level 1
(MSL1) at 260 C. It can be used for lead or lead-free soldering.
For additional information, refer to the Skyworks Application Note,
Solder Reflow Information, document number 200164.
The PCB layout footprint for the SKY12361-350LF is shown in
Figure 11. Typical case markings are noted in Figure 12. Package
dimensions for the 16-pin QFN are shown in Figure 13, and tape
and reel dimensions are provided in Figure 14.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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5
DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
S2245
DC Control 1
DC Control 2
13
V1
14
V3
V4
15
V2
16
DC Control 3
DC Control 4
Figure 9. SKY12361-350LF Evaluation Board Assembly Diagram
1
DC Power
12
N/C
VDD
2
N/C
5
Note 1:
For operation below 100 MHz,
increase the 100 pF capacitors
to 1000 pF or greater.
6
N/C
RFGND1
RFGND4
N/C
4
RFGND3
×
3
RFGND2
100 pF
(Note 1)
100 pF
(Note 1)
RF2
RF1
RF Port 1
×
11
7
N/C
RF Port 2
10
×
9
×
8
×
330 pF
330 pF
Y0940
Figure 10. SKY12361-350LF Evaluation Board Schematic Diagram
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DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
16X 1.10
0.225 X 45o
0.25
1.70
4x Plated Through Vias
12X 0.50 Pitch
See Detail A
Metal Ground Pad 1.70
0.25
Exposed
Soldering
Area
0.60
Detail A
All dimensions are in millimeters
S1691
Figure 11. SKY12361-350LF PCB Layout Footprint
Pin 1
Indicator
Skyworks
Part Number
Lot Number
SKY
12361
XXXXX
Y0939
Figure 12. Typical Part Markings
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DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
1.70 +0.10/–0.15
–C–
(0.20)
Seating Plane
–A–
3.00
–B–
Pin 1
Indicator
–A–
Exposed Pad
O.225 x 45o
Pin 1 Indicator
0.85
0.02 + 0.03/–0.02
0.85
–B–
3.00
0.15 C
2X
2X
1.70 +0.10/–0.15
Detail B
16X 2
0.08 C
0.15 C
Detail A
0.75 ± 0.05
0.10 C
Top View
Side View
Bottom View
0.40 ± 0.10
0.5
0.25
0.25 +0.05/–0.07
0.10 M C A B
0.05 M C
Detail A
Detail B
Scale: 10X
Scale: 20X
16 Places
All measurements are in millimeters.
Dimensioning and tolerancing according to ASME Y14.5M-1994.
Coplanarity applies to the exposed heat sink slug as well as the terminals..
Plating requirement per source control drawing (SCD) 2504.
S1692
Figure 13. SKY12361-350LF 16-Pin QFN Package Dimensions
4.00 ± 0.10
Pin #1
2.00 ± 0.05
1.75 ± 0.10
A
5.50 ± 0.05
3.30 ± 0.10 (Bo)
B
A
12.00 ± 0.30
0.30 ± 0.05 (T)
∅1.50 + 0.1/–0.0
8.00 ± 0.10
B
1.10 ± 0.10 (Ko)
B
R0.25 Typ.
∅1.50 Min.
3.30 ± 0.10 (Ao)
A
Notes:
1. Carrier tape: black conductive polystyrene, non-bakeable material.
2. Cover tape material: transparent conductive HSA.
3. Cover tape size: 9.20 mm width.
4. All measurements are in millimeters.
S1698
Figure 14. SKY12361-350LF Tape and Reel Dimensions
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DATA SHEET • SKY12361-350LF: FOUR-BIT DIGITAL ATTENUATOR
Ordering Information
Model Name
SKY12361-350LF: Digital Attenuator
Manufacturing Part Number
SKY12361-350LF
Evaluation Board Part Numbers
SKY12361-350LF-EVB
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