SKY12338-337LF: 0.35 to 4.0 GHz Two

DATA SHEET
SKY12338-337LF: 0.35 to 4.0 GHz Two-Bit Digital Attenuator
Applications
RF1
 Cellular infrastructure
 Wireless receivers
VCTL1
6 dB
VCTL2
12 dB
Features
 Positive voltage operation: 2.65 to 5 V per bit
 Broadband operation: 0.35 to 4.0 GHz
 Attenuation: 18 dB with 6 dB LSB
 Low insertion loss: 0.75 dB @ 2 GHz
 Absorptive in 50 Ω systems
VDD
RF2
 Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 C per
JEDEC J-STD-020)
S1744
Figure 1. SKY12338-337LF Block Diagram
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Description
The SKY12338-337LF is a GaAs pHEMT two-bit digital attenuator
I/C. The device is provided in a 3 x 3 mm, 12-pin Quad Flat NoLead (QFN) package.
The SKY12338-337LF is particularly suited for low-cost
commercial applications for which high attenuation accuracy, low
insertion loss, and low intermodulation products are required.
VCTL1
12
11
VCTL2
VDD
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.
10
RF1 2
8
RF2
N/C 3
7
N/C
4
5
6
N/C
N/C
N/C
9
N/C
N/C 1
S1745
Figure 2. SKY12338-337LF Pinout – 12-Pin QFN
(Top View)
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DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
Table 1. SKY12338-337LF Signal Descriptions (Note 1)
Pin
Name
Description
Pin
Name
Description
1
N/C
No connection required. May be connected
to ground with no change in performance.
7
N/C
No connection required. May be connected
to ground with no change in performance.
2
RF1
RF port. Must be DC blocked.
8
RF2
RF port. Must be DC blocked.
3
N/C
No connection required. May be connected
to ground with no change in performance.
9
N/C
No connection required. May be connected
to ground with no change in performance.
4
N/C
No connection required. May be connected
to ground with no change in performance.
10
VCTL2
DC control voltage. Controls 12 dB
attenuation state. Refer to Table 4.
5
N/C
No connection required. May be connected
to ground with no change in performance.
11
VCTL1
DC control voltage. Controls 6 dB attenuation
state. Refer to Table 4.
6
N/C
No connection required. May be connected
to ground with no change in performance.
12
VDD
DC power supply.
Note 1: Exposed pad must be grounded.
Table 2. SKY12338-337LF Absolute Maximum Ratings (Note 1)
Parameter
Supply voltage
Symbol
Minimum
VDD
Control voltage
VCTL1, VCTL2
RF input power @ 3 V
PIN
Typical
Maximum
Units
5.5
V
VDD + 0.1
V
+27
dBm
Operating temperature
TOP
–40
+85
C
Storage temperature
TSTG
–65
+150
C
Note 1: 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.
Functional Description
Electrical and Mechanical Specifications
This attenuator has a least significant bit (LSB) of 6 dB and a most
significant bit (MSB) of 12 dB for a total of 18 dB available
attenuation. Pins 10 and 11 (VCTL2 and VCTL1) control the state
of the 6 dB and 12 dB attenuation bits, respectively. For each bit,
a logic low enables the attenuation state while a logic high
enables a low insertion loss state.
The absolute maximum ratings of the SKY12338-337LF are
provided in Table 2. Electrical specifications are provided in
Table 3.
The state of the SKY12338-337LF is determined by the logic
provided in Table 4. The VCTL1 and VCTL2 signals control the
6 dB and 12 dB attenuation bits, respectively. For each bit, a logic
low enables the attenuation state, while a logic high enables the
insertion loss state.
Typical performance characteristics are illustrated in Figure 3 to
Figure 6.
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DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
Table 3. SKY12338-337LF Electrical Specifications (Note 1)
(VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, C1 & C2 = 1000 pF, Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
0.80
1.00
1.20
1.50
dB
dB
dB
dB
Insertion loss
IL
350 to 500 MHz
500 MHz to 2 GHz
2 GHz to 3 GHz
3 GHz to 4 GHz
0.55
0.75
1.00
1.30
Attenuation accuracy
Att
350 to 500 MHz
500 MHz to 2 GHz
2 GHz to 3 GHz
3 GHz to 4 GHz
±(0.5 + 2% of attenuation setting)
±(0.2 + 3% of attenuation setting)
±(0.3 + 3% of attenuation setting)
±(0.4 + 3% of attenuation setting)
dB
dB
dB
dB
Return loss
|S11|
350 to 500 MHz
500 MHz to 2 GHz
2 GHz to 4 GHz
12
15
15
dB
dB
dB
100
ns
Switching characteristics:
Rise/fall time
10
13
12
50% VCTL to 90% RF or 10
to 90% RF
On/off time
50% VCTL to 10% RF or 90
to 10% RF
Attenuation phase settling (Note 2)
Phase change from
500 ns to 5 ms
ns
100
–2
+2
deg
0.25
dB
Attenuation settling amplitude
ATSET
Amplitude change from
500 ns to 5 ms
1 dB Input Compression Point
IP1dB
VCTL = 2.65 V, 350 to
500 MHz, insertion
state
+30
dBm
VCTL = 3 V, 500 MHz
to 4 GHz, insertion
state
+27
dBm
VCTL = 2.65 V, 350 to
500 MHz, all states
+20
dBm
VCTL = 3 V, 500 MHz
to 4 GHz, all states
+20
dBm
VCTL = 2.65 V, 350 to
500 MHz, insertion
state
+45
dBm
VCTL = 2.65 V, 350 to
500 MHz, all states
+44
dBm
VCTL = 3 V, 500 MHz
to 4 GHz, insertion
state
+45
dBm
VCTL = 3 V, 500 MHz
to 4 GHz, all states
+45
dBm
0.1 dB Input Compression Point
rd
3 Order Input Intercept Point
IP0.1dB
IIP3
Supply voltage
VDD
Supply current
IDD
2.65
380
Control voltage
VDD
VCTL = low
VCTL = high
Control current
VCTL = low
VCTL = high
2.65
0
VDD – 0.2
5.00
V
450
μA
5.00
0.2
VDD + 0.1
V
V
V
10
250
μA
μA
Note 1: Performance is guaranteed only under the conditions listed in this table.
Note 2: Not measured. Performance guaranteed by design.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
Table 4. SKY12338-337LF Truth Table (Note 1)
State
VDD
VCTL1
VCTL2
Insertion loss
high
high
high
6 dB
high
low
high
12 dB
high
high
low
18 dB
high
low
low
Note 1: high = +2.65 to 5 V
low = 0 to 0.2 V
Any state other than described in this Table places the attenuator into an undefined state.
Typical Performance Characteristics
(VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, C1 & C2 = 1000 pF, Unless Otherwise Noted)
0
0
–4
Attenuation (dB)
–0.5
Insertion Loss (dB)
6 dB
12 dB
18 dB
–1.0
–1.5
–2.0
–8
–12
–16
–2.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
–20
5.0
0
0.5
1.0
1.5
Frequency (GHz)
Figure 3. Insertion Loss vs Frequency
3.0
3.5
0
6 dB
12 dB
18 dB
+4
4.0
+3
+2
+1
0
–1
–2
5.0
–10
4.5
5.0
–15
–20
–25
–30
–35
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency (GHz)
Figure 5. Attenuation Error vs Frequency
(Normalized to Insertion Loss)
4.5
5.0
–40
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency (GHz)
Figure 6. Return Loss vs Frequency
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4.5
Insertion Loss
6 dB
12 dB
18 dB
–5
Return Loss (dB)
Attenuation Error (dB)
2.5
Figure 4. Attenuation vs Frequency
(Normalized to Insertion Loss)
+5
–3
–4
2.0
Frequency (GHz)
April 17, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201165F
DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
Evaluation Board Description
Package and Handling Information
The SKY12338-337LF Evaluation Board is used to test the
performance of the SKY12338-337LF digital attenuator. An
Evaluation Board schematic diagram is shown in Figure 7. Table 5
provides the Bill of Materials (BOM) list for Evaluation Board
components. An assembly drawing for the Evaluation Board is
shown in Figure 8.
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 SKY12338-337LF 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 SKY12338-337LF is shown in
Figure 9. Typical case markings are noted in Figure 10. Package
dimensions for the 12-pin QFN are shown in Figure 11, and tape
and reel dimensions are provided in Figure 12.
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.
Control Voltage
(0/2.65-5.00 V)
Control Voltage
(0/2.65-5.00 V)
Supply Voltage
(2.65-5.00 V)
2
RF1
3
N/C
RF1
RF2
N/C
N/C
N/C
×
VCTL2
N/C
4
×
5
×
9
×
C2
8
7
RF2
×
N/C
C1
1
N/C
×
10
VCTL1
11
VDD
12
6
×
S1747
Figure 7. SKY12338-337LF Evaluation Board Schematic Diagram
Table 5. SKY12338-337LF Evaluation Board Bill of Materials (Note 1)
Component
C1, C2
Value
1000 pF
Size
0402
Manufacturer/Part Series
Murata GRM Series
Note 1: Blocking capacitors are required on both RF ports for proper functionality. Value of DC blocking capacitor determines lower frequency operation.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201165F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 17, 2014
5
DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
S1746
Figure 8. SKY12338-337LF Evaluation Board Assembly Diagram
12X 0.95
(To Metal Pads)
1.15 (Sq.)
Solder
Area
Pitch 0.50
4X Ground Vias
See Detail A
0.25
Solder Area
0.75
All measurements in millimeters
Detail A 12X
Scale = 48X
S1855
Figure 9. SKY12338-337LF PCB Layout Footprint
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
Pin 1
Indicator
Skyworks Part #
Lot #
Date Code:
(Y = Calendar Year
WW = Week)
Figure 10. Typical Part Markings
1.150 +0.10/–0.15
C
(0.20)
Seating Plane
0.02 + 0.03/–0.02
A
3
B
Pin 1
Indicator
1.000
0.575
Exposed Pad
Detail A
0.575
3
1.000
1.150 +0.10/–0.15
B
0.15 C
2X
Detail C
0.90 ± 0.10
2X
0.10 C
Top View
0.20 Min.
12X
12X 4
0.08 C
0.15 C
Side View
A
Detail B
Bottom View
R0.125 Typ.
0.18
0.55 +0.10
0.18
0.435
5
0.10 M C A B
0.435
0.5
0.25 +0.05/–0.07 0.05 M C
Detail A
Detail B
Detail C
Scale: 20X
Scale: 20X
Scale: 40X
12 Places
All measurements are in millimeters.
Dimensioning and tolerancing according to ASME Y14.5M-1994.
Unilateral coplanarity applies to the exposed heat sink slug as well as the terminals.
Plating requirement per source control drawing (SCD) 2504.
Dimension applies to metallized terminal and is measured between 0.15 and 0.30 mm
from the terminal tip. Do not measure at radius area.
S1866
Figure 11. SKY12338-337LF 12-Pin QFN Package Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
8.00
2.00 ± 0.05
(See Note 3)
ø1.50 Min.
4.00
(See Note 1)
0.30 ± 0.05
Pin 1
Indicator
ø1.5 +0.1/–0
A
1.75 ± 0.10
R0.3 Max
5.50 ± 0.05
(See Note 3)
12.0 ± 0.3
3.30 (Bo)
A
1.10 (Ko)
A
3.30 (Ao)
0.25
R0.25
Notes:
1. Sprocket hole pitch cumulative tolerance: ±0.2.
2. Carrier tape: black conductive polystyrene.
3. Pocket position relative to sprocket hole, measure
as true position of pocket, not pocket hole.
4. Cover tape: transparent conductive material.
5. All dimensions are in millimeters.
Y0880
Figure 12. SKY12338-337LF Tape and Reel Dimensions
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DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR
Ordering Information
Model Name
SKY12338-337LF Digital Attenuator
Manufacturing Part Number
SKY12338-337LF
Evaluation Board Part Numbers
SKY12338-337LF-EVB
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