SKYWORKS SKY12340

DATA SHEET
SKY12340-364LF: 300 kHz – 2.0 GHz Five-Bit Digital
Attenuator with Serial-to-Parallel Driver
Applications
VSS
Features
DATA_OUT
DATA_IN
 Single, +5 V DC supply voltage
 Integrated silicon serial-to-parallel driver
 Attenuation: 0.5 dB steps to 15.5 dB
 Small, QFN (32-pin, 5 x 5 mm) Pb-free package (MSL1, 260 C
per JEDEC J-STD-020)
RF2
LATCH
CLK_IN
8 dB
Serial-To-Parallel Driver
 Cellular infrastructure
 Wireless receivers
VDD
4 dB
2 dB
1 dB
0.5 dB
RESET
RF1
S1591
Figure 1. SKY12340-364LF Block Diagram
Description
The SKY12340-364LF is a GaAs FET five-bit digital attenuator I/C
with a serial-to-parallel driver. The device is provided in a
5 x 5 mm, 32-pin Quad Flat No-Lead (QFN) package.
The SKY12340-364LF is particularly suited at IF frequencies for
which high attenuation accuracy, low insertion loss, and low
intermodulation products are required.
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.
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1
VDD
C1
C2
GND
VSS
CLK_IN
DATA_IN
LATCH
DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
32
31
30
29
28
27
26
25
GND
3
22
GND
GND
4
21
GND
RF1
5
20
RF2
GND
6
19
GND
GND
7
18
GND
GND
8
17
GND
9
10
11
12
13
14
15
16
GND
GND
GND
23
GND
2
GND
GND
GND
RESET
GND
24
GND
1
GND
DATA_OUT
S1584
Figure 2. SKY12340-364LF Pinout – 32-Pin QFN
(Top View)
Table 1. SKY12340-364LF Signal Descriptions
Pin #
Name
Description
Pin #
Name
Description
1
DATA_OUT
Serial data output
17
GND
Ground
2
GND
Ground
18
GND
Ground
3
GND
Ground
19
GND
Ground
4
GND
Ground
20
RF2
RF input/output
5
RF1
RF input/output
21
GND
Ground
6
GND
Ground
22
GND
Ground
7
GND
Ground
23
GND
Ground
8
GND
Ground
24
RESET
Reset
9
GND
Ground
25
LATCH
Latch enable
10
GND
Ground
26
DATA_IN
Serial data input
11
GND
Ground
27
CLK_IN
Serial clock input
12
GND
Ground
28
VSS
Low output voltage level
13
GND
Ground
29
GND
Ground
14
GND
Ground
30
C2
Charge pump capacitor 2
15
GND
Ground
31
C1
Charge pump capacitor 1
16
GND
Ground
32
VDD
Supply voltage
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DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
Functional Description
changes states on the rising edge of the latch-enable (LE) signal,
according to the most recent five bits of shifted data accepted
since the previous falling edge of the LE signal. Refer to the
timing diagram in Figure 3 and timing parameter specifications in
Table 2.
The SKY12340-364LF is a five bit digital attenuator comprised of
a GaAs attenuator and a silicon CMOS driver. The attenuation
setting is controlled by a serial-to-parallel interface. Attenuation is
set by a stream of data that is clocked into the shift registers of
the silicon chip by the clock signal.
Power-up sequence is as follows:
0. Connect ground
To set the attenuation state, a latch signal is sent to the
appropriate pin to send the correct bias voltages to the GaAs
attenuator. The silicon chip generates a negative voltage using a
negative voltage generator that requires two external
components: a charge pump capacitor connected between pins
30 (C2) and 31 (C1) and a voltage hold capacitor connected from
pin 28 (VSS) to ground.
1. Apply VDD
2. Set all inputs (SCK, SDA, LE)
The power-down sequence is the reverse of above.
Electrical and Mechanical Specifications
More than one attenuator can be cascaded together and the data
may be passed through one device to the other using the
DATA_OUT signal (pin 1). To reset the attenuator to the insertion
loss state, a logic low signal may be sent to the reset pin. DC bias
voltage to the silicon CMOS chip is applied to pin 32 (VDD).
The absolute maximum ratings of the SKY12340-364LF are
provided in Table 3. Electrical specifications are provided in
Tables 4 and 5.
Typical performance characteristics of the SKY12340-364LF are
illustrated in Figures 4 through 10.
Power-Up/Power-Down Timing
The state of the SKY12340-364LF is determined by the logic
provided in Table 6.
Serial data (SDA) is shifted into the register on the rising edge of
the clock (SCK), least significant bit (LSB) first. The attenuator
Data Feedthrough
LE
T4
T1
SCK
SDA
T2
T3
T5
S1594
Figure 3. Power-Up/Power-Down Timing
Table 2. Power-Up/Power-Down Timing Parameters
Parameter
Minimum
Typical
T1
7.5
15
SDA setup time
T2
7.5
15
ns
SDA hold time
T3
5
10
ns
LE hold time
T4
5
10
Clock frequency
fCLK
16
Clock period
T5
1/fCLK
LE setup time
Symbol
Maximum
Units
ns
ns
100
MHz
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DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
Table 3. SKY12340-364LF Absolute Maximum Ratings
Parameter
Symbol
Minimum
Typical
Maximum
Units
–0.5
+6.0
V
–0.5 – VDD
+0.5
V
+25
dBm
Supply voltage
VDD
Input voltage
VI
RF input power
PIN
Storage temperature
TSTG
–65
+150
C
Operating temperature
TOP
–40
+85
C
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.
Table 4. SKY12340-364LF Electrical Specifications (Note 1)
(TOP = +25 C, Characteristic Impedance [ZO] = 50 Ω, VDD = 5 V, Unless Otherwise Noted)
Parameter
Insertion loss (Note 2)
Symbol
IL
Test Condition
Min
Typical
Max
Units
300 kHz to 1.0 GHz
1.4
1.5
dB
300 kHz to 2.0 GHz
1.8
2.0
dB
Attenuation range (Note 3)
15.5
Attenuation accuracy (Note 3)
Return loss
300 kHz to 2.0 GHz
|S11|
Switching characteristics:
Rise, fall
On, off
Video feedthrough
1 dB input compression point
300 kHz to 2.0 GHz
20
dB
50
100
50
ns
ns
mV
+27
+26
+30
+30
dBm
dBm
Insertion loss state:
0.05 GHz
0.5 to 2.0 GHz
+43
+47
+45
+50
dBm
dBm
Attenuation states:
0.05 GHz
0.5 to 2.0 GHz
+41
+47
+45
+50
dBm
dBm
1.7
0
3.5
0.3
Insertion loss state
0.5 to 2.0 GHz
0.05 GHz
3rd Order Intercept Point
12
10/90% or 90/10% RF
50% control to 90/10% RF
TRISE = 1 ns,
bandwidth = 500 MHz
IP1dB
IP3
dB
±(0.35 + 2% of attenuation setting in dB)
1 MHz spacing,
PIN = +5 dBm/tone
Input voltage:
High
Low
VH
VL
Input leakage current
IL
±0.5
μA
Quiescent current
IDD
500
μA
Supply voltage
VDD
5
V
5.0
0.6
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Note 2: Insertion loss changes by 0.003 dB/°C.
Note 3: Attenuation value referenced above insertion loss. Exposed pad must be connected to RF ground to obtain specified attenuation.
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V
V
DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
Typical Performance Characteristics
(TOP = +25 C, Characteristic Impedance [ZO] = 50 Ω, VDD = 5 V, Unless Otherwise Noted)
+0.5
0
–40 °C
+25 °C
+85 °C
Inseriton Loss (dB)
–0.4
0.5 dB
1.0 dB
2.0 dB
+0.4
+0.3
Attenuation Error (dB)
–0.2
–0.6
–0.8
–1.0
–1.2
–1.4
+0.2
+0.1
0
–0.1
–0.2
–1.6
–0.3
–1.8
–0.4
–0.5
–2.0
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
0
0.25
0.50
0.75
1.25
1.50
1.75
2.00
1.75
2.00
Figure 5. Attenuation Error vs Frequency
(0.5, 1.0, and 2.0 dB States)
Figure 4. Insertion Loss vs Frequency
20
Attenuation Relative Phase (Degrees)
+0.5
4.0 dB
8.0 dB
15.5 dB
+0.4
+0.3
Attenuation Error (dB)
1.00
Frequency (GHz)
Frequency (GHz)
+0.2
+0.1
0
–0.1
–0.2
–0.3
–0.4
0.5 dB
1.0 dB
2.0 dB
18
16
14
12
10
8
6
4
2
0
–0.5
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
0
2.00
0.25
0.50
0.75
1.00
1.25
1.50
Frequency (GHz)
Frequency (GHz)
Figure 7. Attenuation Relative Phase vs Frequency,
Normalized to Insertion Loss
(0.5, 1.0, and 2.0 dB States)
Figure 6. Attenuation Error vs Frequency
(4.0, 8.0, and 15.5 dB States)
4.0 dB
8.0 dB
15.5 dB
18
16
+0.5
50 MHz
100 MHz
500 MHz
+0.4
14
Attenuation Error (dB)
Attenuation Relative Phase (Degrees)
20
12
10
8
6
4
2
+0.3
+0.2
+0.1
0
–0.1
–0.2
–0.3
–0.4
0
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
Frequency (GHz)
Figure 8. Attenuation Relative Phase vs Frequency,
Normalized to Insertion Loss
(4.0, 8.0, and 15.5 dB States)
2.00
–0.5
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15 16
Attenuation State (dB)
Figure 9. Attenuation Error vs Attenuation State
(@ 50, 100, and 500 MHz)
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DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
0
+0.4
–0.1
+0.3
–0.2
Attenuation Step (dB)
Attenuation Error (dB)
+0.5
+0.2
+0.1
0
–0.1
–0.2
1000 MHz
1500 MHz
2000 MHz
–0.3
–0.4
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0
–0.5
0
1
2
3
4
5
6
7
8
9
10
11 12
50 MHz
100 MHz
500 MHz
13
14
15 16
0
1
2
3
4
5
0
8
9
10
11
–0.2
–0.4
–0.5
–0.6
–0.7
–10
15
–20
–25
–30
–35
–40
–0.9
–45
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
–50
0
1
2
3
4
5
6
7
8
9
10
11
1000 MHz
1500 MHz
2000 MHz
–10
–15
–20
–25
–30
–35
–40
–45
1
2
3
4
5
6
7
8
9
13
Figure 13. Return Loss vs Attenuation State
(@ 50, 100, and 500 MHz)
0
–5
0
12
Attenuation State (dB)
Figure 12. Attenuation Step vs Attenuation State
(@ 1000, 1500, and 2000 MHz)
Return Loss (dB)
14
–15
–0.8
Attenuation State (dB)
10
11
12
13
14
15
Attenuation State (dB)
Figure 14. Return Loss vs Attenuation State
(@ 1000, 1500, and 2000 MHz)
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13
50 MHz
100 MHz
500 MHz
–5
Return Loss (dB)
–0.3
–50
12
0
1000 MHz
1500 MHz
2000 MHz
–0.1
Attenuation Step (dB)
7
Figure 11. Attenuation Step vs Attenuation State
(@ 50, 100, and 500 MHz)
Figure 10. Attenuation Error vs Attenuation State
(@ 1000, 1500, and 2000 MHz)
–1.0
6
Attenuation State (dB)
Attenuation State (dB)
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15
DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
Table 6. SKY12340-364LF Truth Table
J1 to J2
Attenuation
Serial Data Input
Reset
0.5 dB
1.0 dB
2.0 dB
4.0 dB
8.0 dB
Insertion loss
1
0
0
0
0
0
0.5 dB
1
1
0
0
0
0
1.0 dB
1
0
1
0
0
0
2.0 dB
1
0
0
1
0
0
4.0 dB
1
0
0
0
1
0
8.0 dB
1
0
0
0
0
1
15.5 dB
1
1
1
1
1
1
Insertion loss
0
X
X
X
X
X
Note:
“1” = VH = +1.7 V to +5 V. “0” = VL = 0 to +0.6 V. “X” = don’t care. 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 SKY12340-364LF Evaluation Board is used to test the
performance of the SKY12340-364LF digital attenuator. An
assembly drawing for the Evaluation Board is shown in Figure 15
and an Evaluation Board schematic diagram is shown in
Figure 16. Table 7 provides the Evaluation Board Bill of Materials
(BOM) list.
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.
The Evaluation Board includes the required charge pump
capacitor between pins 30 and 31. It also includes the negative
voltage holding capacitor required from pin 28 to ground.
A capacitor is added to pin 31 to ground any noise on the DC
supply line.
Package Dimensions
The PCB layout footprint for the SKY12340-364LF is shown in
Figure 17. Typical case markings are noted in Figure 18. Package
dimensions for the 32-pin QFN are shown in Figure 19, and tape
and reel dimensions are provided in Figure 20.
The SKY12340-364LF 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.
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. For packaging details, refer to the Skyworks
Application Note, Discrete Devices and IC Switch/Attenuators
Tape and Reel Package Orientation, document number 200083.
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7
DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
1
RF2
C2
RF1
C1
SDO
VDD
CLK
SDI
LE
RST
C3
S1593
Figure 15. SKY12340-364LF Evaluation Board Assembly Diagram
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DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
C2
Clock
C1
Data Input
Supply Voltage (+5 V)
Latch Enable
C3
CLK_IN
1
Serial Data Output
26
DATA_OUT
25
LATCH
27
DATA_IN
28
VSS
29
GND
C1
30
C2
31
VDD
32
24
RESET
GND
GND
GND
GND
GND
GND
RF1
RF2
3
4
5
RF In/Out
9
10
11
12
13
14
21
20
RF In/Out
15
18
17
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
8
22
19
6
7
Reset (+5 V)
23
2
16
NOTE: Exposed bottom pad must be grounded
S1592
Figure 16. SKY12340-364LF Evaluation Board Schematic Diagram
Table 7. Recommended Evaluation Board Bill of Materials
Component
Value
Size
Manufacturer
C1
0.025 μF
0402
Murata
C2
0.01 μF
0402
Murata
C3
0.01 μF
0402
Murata
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9
DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
Pin 32
R0.30
(Pin 1 Indicator)
2X 1.575
32X Exposed Solder
Area – See Detail A
Pin 1
16X 2.100
0.250 Typ.
CL
2X 1.575
0.50 Pitch
See Detail A
CL
Exposed Solderable
Area – Ground Pad
Package Outline
16X 2.100
0.55
Solderable Area
Through-View
From Top
0.25
Detail A
32X
Scale = 48X
S1608
All measurements are in millimeters
Figure 17. SKY12340-364LF PCB Layout Footprint
Pin 1
Indicator
Skyworks Part #
Lot #
Date Code:
(Y = Calendar Year
WW = Week)
Figure 18. Typical Part Markings
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DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
C
5.0
3.15 +0.10/–0.15
Seating Plane
0.20 Ref.
A
B
Pin 1
Indicator
0.02 +0.03/–0.02
Pin 1 Ind.
R0.30
Exposed Pad
5.0
3.15 +0.10/–0.15
–B–
1.575 +0.05/–0.075
0.15 C
2X
32X
2X
3
Detail A
0.08 C
0.15 C
Detail B
0.90/0.10
–A–
0.10 C
Top View
Side View
Bottom View
R0.30 Typ.
CL
0.40 ± 0.10
Datum A or B
0.25 +0.05/–0.07
0.25
0.10 M C A B
0.05 M C
0.5
Detail B
Detail C
Scale: 20X
Scale: 40X
32 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.
S1583
Figure 19. SKY12340-364LF 32-Pin QFN Package Dimensions
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DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
4.00 ± 0.10
Pin #1
2.00 ± 0.05
B
1.75 ± 0.10
A
5.50 ± 0.05
5.25 (Bo)
R0.3 Max.
A
12.00 ± 0.30
0.30 ± 0.05 (T)
∅1.50 + 0.1/–0.0
8.00 ± 0.10
B
1.10 (Ko)
5.25 (Ao)
R0.25 Typ.
B
A
∅1.50 Min.
R0.3 Max.
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.
S1602
Figure 20. SKY12340-364LF Tape and Reel Dimensions
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DATA SHEET • SKY12340-364LF FIVE-BIT DIGITAL ATTENUATOR
Ordering Information
Model Name
SKY12340-364LF Digital Attenuator
Manufacturing Part Number
SKY12340-364LF (Pb-free package)
Evaluation Board Part Numbers
EN31-D305-001, rev. A
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DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS
SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION,
LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury,
death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any
damages resulting from such improper use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of
products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for
applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands
and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com,
are incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201111B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 5, 2010
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