Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
SKY12349-362LF: 0.7-4.0 GHz Five-Bit Digital Attenuator
with Serial-to-Parallel Driver (0.5 dB LSB)
Applications
• Base stations
• Wireless and RF data
• Wireless local loop gain control circuits
Features
• Broadband operation: 0.7 to 4.0 GHz
• Attenuation: 15.5 dB
• LSB attenuation: 0.5 dB
• Low insertion loss: 1 dB @ 900 MHz
• Positive voltage operation: 5 V
• Integrated silicon serial-to-parallel driver
• Small, QFN (24-pin, 4 x 4 mm) package (MSL1, 260 °C per
JEDEC J-STD-020)
Figure 1. SKY12349-362LF Block Diagram
Description
The SKY12349-362LF is a GaAs FET five-bit digital attenuator I/C
with a serial-to-parallel driver. The device is provided in a
4 x 4 mm, 24-pin Quad Flat No-Lead (QFN) package.
The SKY12349-362LF is particularly suited for applications in
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201399B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
1
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Figure 2. SKY12349-362LF Pinout – 24-Pin QFN
(Top View)
Table 1. SKY12349-362LF Signal Descriptions
Pin #
Name
Description
Pin #
Name
Description
1
GND or N/C
Ground or no connection
13
GND or N/C
Ground or no connection
2
RF1
RF input/output. Must be DC blocked.
14
VCC
Fixed bias for SPI
3
GND or N/C
Ground or no connection
15
GND or N/C
Ground or no connection
4
GND or N/C
Ground or no connection
16
GND or N/C
Ground or no connection
5
SERIAL_OUTPUT
Data output delayed by eight clock cycles
17
RF2
RF input/output. Must be DC blocked.
6
GND or N/C
Ground or no connection
18
GND or N/C
Ground or no connection
7
RESET
Reset. Clears shift registers.
19
GND
Ground
8
CLOCK
Serial clock input
20
GND
Ground
9
LATCH_ENABLE
On rising edge of pulse, shifts five most
recent clocked-in bits to set attenuation
state
21
GND
Ground
10
GND or N/C
Ground or no connection
22
GND
Ground
11
SERIAL_INPUT
Data input
23
GND
Ground
12
GND or N/C
Ground or no connection
24
GND
Ground
Note:
Exposed pad must be grounded.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2
April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201399B
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Functional Description
The SKY12349-362LF 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. To set the attenuation state, a
latch signal is sent to the appropriate pin to send the correct bias
voltages to the GaAs attenuator.
More than one attenuator can be cascaded together and the data
may be passed through one device to the other using the
SERIAL_OUTPUT signal (pin 5). 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 14
(VCC).
Power-Up/Power-Down Timing
Serial input data (SERIAL_INPUT pin) is shifted into the register on
the rising edge of the clock (CLOCK pin), least significant bit (LSB)
first. The attenuator changes states on the rising edge of the
latch-enable (LATCH_ENABLE pin) signal, according to the most
recent five bits of shifted data accepted since the previous falling
edge of the latch enable signal. The serial data output is the serial
input data delayed by eight clock cycles.
Refer to the timing diagram in Figure 3 and timing parameter
specifications in Table 2. Table 3 shows the transition states
based on the latch enable, clock, and reset logic settings.
Power-up sequence is as follows:
0. Connect ground
1. Apply VCC
2. Set all inputs (SCK, SDA, LE)
The power-down sequence is the reverse of above.
Figure 4 shows an example of how to set the attenuator to the
0.5 dB state. The progression of the bit states vs the clock signal
is shown. The timing diagram shows that when the latch enable
signal goes high, the voltages v1 to v5 set the attenuator to the
0.5 dB state.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY12349-362LF are
provided in Table 4. Electrical specifications are provided in
Tables 5 and 6.
Typical performance characteristics of the SKY12349-362LF are
illustrated in Figures 5 through 11.
The state of the SKY12349-362LF is determined by the logic
provided in Table 7.
Figure 3. Power-Up/Power-Down Timing
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201399B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
3
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Table 2. Power-Up/Power-Down Timing Parameters
Parameter
Symbol
VCC = 5 V
Minimum
VCC = 3 V
Typical
Maximum
Minimum
Typical
Maximum
Units
Serial input setup time
ts
5
5
ns
Hold time from serial input to shift clock
th
5
5
ns
Setup time from shift clock to latch enable
tlsup
Propagation delay, latch enable to C0.5
through C8
tpd
Setup time from reset to shift clock
–
Clock frequency
fCLK
40
100
ns
30
20
70
ns
10
MHz
50
ns
30
Table 3. Transition State Logic
LATCH_ENABLE (Pin 9)
CLOCK (Pin 8)
RESET (Pin 7)
X
X
L
H
Shift register clocked
X
H
Contents of shift register transferred to digital attenuator
X
Function
Shift register cleared
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
4
April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201399B
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Figure 4. Example for Setting 0.5 dB State
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201399B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
5
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Table 4. SKY12349-362LF Absolute Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Units
+30
dBm
RF input power @ 5 V
PIN
Supply voltage
VCC
6
V
Control voltage
VCTL
–0.2
+8
V
Operating temperature
TOP
–40
+85
°C
Storage temperature
TSTG
–65
+150
°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 5. SKY12349-362LF Electrical Specifications (1 of 2) (Note 1)
(VCC = 3 to 5 V, VCTL = 0 to 3 V and 5 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted)
Parameter
Insertion loss
Symbol
Test Condition
Min
0.7 to 1.4 GHz
1.4 to 2.3 GHz
2.3 to 2.7 GHz
2.7 to 4.0 GHz
Attenuation range
Attenuation accuracy
Max
Units
1.2
1.3
1.8
2.0
1.5
2.0
2.3
2.7
dB
dB
dB
dB
15.5
dB
±(0.5 + 5% of attenuation setting max)
±(0.3 + 4% of attenuation setting max)
±(0.5 + 5% of attenuation setting max)
dB
dB
dB
15
17
15
12
17
20
17
13
dB
dB
dB
dB
50% VCTL to 90% RF or
10/90% RF
1200
ns
50% VCTL to 10% RF or
90/10% RF
500
ns
Attenuation referred to
insertion loss, all
attenuation states
0.7 to 0.9 GHz
0.9 to 2.2 GHz
2.2 to 4.0 GHz
Return loss
RF1 and RF2 pins, all
attenuation states
0.7 to 1.4 GHz
1.4 to 2.3 GHz
2.3 to 2.7 GHz
2.7 to 4.0 GHz
Switching characteristics:
On/rise time
Off/fall time
Typical
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
6
April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201399B
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Table 5. SKY12349-362LF Electrical Specifications (2 of 2) (Note 1)
(VCC = 3 to 5 V, VCTL = 0 to 3 V and 5 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted)
Parameter
Symbol
Input power for 0.1 dB compression
Test Condition
Min
Max
Units
0.7 to 3.8 GHz
VCC = VCTL = 5 V
VCC = VCTL = 3 V
Input power for 1 dB compression
+25
+23
dBm
dBm
+32
+30
dBm
dBm
+42
+42
dBm
dBm
0.7 to 3.8 GHz
VCC = VCTL = 5 V
VCC = VCTL = 3 V
3rd Order Input Intercept Point
Typical
IIP3
0.7 to 3.8 GHz, for twotone input power.
0 dBm/tone, 1 MHz
spacing
VCC = VCTL = 5 V
VCC = VCTL = 3 V
Note 1: Performance is guaranteed only under the conditions listed in this Table and is not guaranteed over the full operating or storage temperature ranges. Operation at elevated
temperatures may reduce reliability of the device.
Table 6. DC Electrical Characteristics (Note 1)
(VCC = 3 to 5 V, VCTL = 0 to 3 V and 5 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
Input voltage, high
VIH
VCC = 3 V
VCC = 5 V
2.3
3.0
3.0
5.0
V
V
Input voltage, low
VIL
VCC = 3 V
VCC = 5 V
0
0
1.0
1.5
V
V
Input leakage current
IL
Quiescent current
ICC
Supply voltage
VCC
μA
0.5
μA
500
3.0
5.0
5.5
V
Note 1: Performance is guaranteed only under the conditions listed in this Table and is not guaranteed over the full operating or storage temperature ranges. Operation at elevated
temperatures may reduce reliability of the device.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201399B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
7
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Typical Performance Characteristics
(VCC = 5 V, VCTL = 0 to 5 V, TOP = +25 °C, PIN = 0 dBm, CBLK = 47 pF, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted)
Figure 5. Insertion Loss vs Frequency
Figure 6. Input Return Loss: Major States
Figure 7. Normalized Attenuation: Major States
Figure 8. Attenuation Bit Error vs Attenuation State
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
8
April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201399B
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Figure 10. Relative Phase: Major States
Figure 9. Attenuation Bit Error: Major States
Figure 11. Worst Case Attenuation Step Error Between
Successive Attenuation States
Table 7. SKY12349-362LF Truth Table
RF1/RF2 (Pins 2 & 17)
Attenuation
Serial Data Input
RESET
(Pin 7)
0.5 dB
1.0 dB
2.0 dB
4.0 dB
8.0 dB
Insertion loss
1
1
1
1
1
1
0.5 dB
1
0
1
1
1
1
1.0 dB
1
1
0
1
1
1
2.0 dB
1
1
1
0
1
1
4.0 dB
1
1
1
1
0
1
8.0 dB
1
1
1
1
1
0
15.5 dB
1
0
0
0
0
0
Insertion loss
0
X
X
X
X
X
Note:
For VCC = 5 V: “1” = VIH = +3.0 V to +5 V. “0” = VIL = 0 to +1.5 V.
For VCC = 3 V: “1” = VIH = +2.3 V to +3 V. “0” = VIL = 0 to +1.0 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201399B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
9
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Evaluation Board Description
Package and Handling Information
The SKY12349-362LF Evaluation Board is used to test the
performance of the SKY12349-362LF digital attenuator. An
assembly drawing for the Evaluation Board is shown in Figure 12
and an Evaluation Board schematic diagram is shown in
Figure 13.
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 SKY12349-362LF 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 SKY12349-362LF is shown in
Figure 14. Typical case markings are noted in Figure 15. Package
dimensions for the 24-pin QFN are shown in Figure 16, and tape
and reel dimensions are provided in Figure 17.
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.
Figure 12. SKY12349-362LF Evaluation Board Assembly Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
10
April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201399B
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Figure 13. SKY12349-362LF Evaluation Board Schematic Diagram
Figure 14. SKY12349-362LF PCB Layout Footprint
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201399B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
11
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Figure 15. Typical Part Markings
Figure 16. SKY12349-362LF 24-Pin QFN Package Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
12
April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201399B
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Figure 17. SKY12349-362LF Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201399B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
13
DATA SHEET • SKY12349-362LF FIVE-BIT DIGITAL ATTENUATOR
Ordering Information
Model Name
SKY12349-362LF Digital Attenuator
Manufacturing Part Number
SKY12349-362LF
Evaluation Board Part Numbers
SKY12349-362LF-EVB
Copyright © 2011 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by
Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the
information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or
information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of
Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A
PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY
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 • sales@skyworksinc.com • www.skyworksinc.com
14
April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201399B