data sheet
SKY12329-350LF: GaAs Digital Attenuator
5-Bit, 1 dB LSB 400 MHz–4 GHz
Functional Block Diagram
Applications
l
l
RF
Input/Output
T ransceiver transmit automatic level control or receive automatic gain control in WiMAX, GSM, CDMA, WCDMA, WLAN,
Bluetooth®, Zigbee®, Land Mobile Radio Base stations or
Terminal Equipment
G
eneral purpose signal attenuation in telecommunications and
instrumentation applications
V1
1 dB
V2
2 dB
V3
4 dB
V4
8 dB
V5
16 dB
Features
B
roadband: 400 MHz–4 GHz
A ttenuation range: 31 dB
l L
east significant bit attenuation: 1 dB
l L
ow insertion loss: 1.2 dB @ 900 MHz
l S
ingle positive control voltage: 2.7–5.5 V
l L
ow current consumption: <100 µA @ 5 V
l S
mall QFN-16 3 x 3 mm package with exposed paddle
l
L ead (Pb)-free and RoHS-compliant MSL-1 @ 260 °C
per JEDEC J-STD-020
l
l
RF
Input/Output
Description
The SKY12329-350LF is a monolithic GaAs, binary-weighted,
5-bit, single positive control voltage digital attenuator which
operates from 400 MHz–4 GHz. The attenuator has a least
significant bit (LSB) of 1 dB and total attenuation of 31 dB. The
two RF ports are bilateral; each can be used as the RF input or
the RF output. This attenuator requires an external supply
voltage of 2.7–5.5 V.
The SKY12329-350LF is comprised of 5 fixed attenuators in
cascade, each of which having a shunt bypass switch. Beginning
at the LSB, which is 1 dB, each succeeding fixed attenuator produces twice the attenuation of the preceding stage. The state of
each bypass switch is controlled by the logic level voltage applied
to the associated control voltage input; a logic high voltage closes
the associated switch, thereby
bypassing that fixed attenuator stage, and a logic low opens the
switch to force the input signal to that stage through the associated attenuator.
DC power consumption is very low, 100 µA maximum with control voltage and supply voltage of 5 V. The switch can operate
over the temperature range of -40 °C to +85 °C.
An evaluation board is available upon request.
NEW
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances)-compliant packaging.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200709 Rev. F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 20, 2009
1
Data Sheet • SKY12329-350LF
Electrical Specifications
VCTL = 0 V/5 V, T = 25 °C, PINPUT = 0 dBm, ZO = 50 W, unless otherwise noted
Parameter
Condition
Insertion loss
Frequency
Min.Typ.
0.4–1.0 GHz
1.0–2.0 GHz
2.0–3.0 GHz
3.0–4.0 GHz
Attenuation range
1.2 1.5
1.8
2.7
Max.
Unit
1.6
1.9
2.2
3.1
dB
dB
dB
dB
31
Attenuation accuracy Attenuation referred to insertion loss. All attenuation states
0.4–1.0 GHz
± (0.35 + 3% of attenuation setting in dB)
All attenuation states
1.0–3.0 GHz
± (0.3 + 3% of attenuation setting in dB)
1–15 dB attenuation states
3.0–4.0 GHz
± (0.5 + 5% of attenuation setting in dB)
16–31 dB attenuation states
3.0–4.0 GHz
± (0.6 + 6% of attenuation setting in dB)
Return loss
0.4–1.0 GHz
1.0–4.0 GHz
7
10
dB
dB
dB
dB
dB
dB
dB
Operating Characteristics
VCTL = 0 V/5 V, T = 25 °C, PINPUT = 0 dBm, ZO = 50 W, unless otherwise noted
Parameter
Condition
Frequency
Min.Typ.
Max.
Switching characteristics
On/rise time
50/90% or 10/90% RF
150
Off/fall time
50/10% or 90/10% RF
500
900 MHz
900 MHz
Unit
ns
ns
Input power for 1 dB compression
VLOW = 0 V, VHIGH = 3 V
VLOW = 0 V, VHIGH = 5 V
29
31
dBm
dBm
Input third order intermodulation intercept
For two input tones. +5 dBm each tone
VLOW = 0 V, VHIGH = 3 V
1–4 GHz
39
VLOW = 0 V, VHIGH = 5 V
1–4 GHz
41
dBm
dBm
Thermal resistance
Junction to package terminal
°C/W
Supply voltage
Control voltage
High
Low
Control port current
VCTL = VHIGH
VCTL = VLOW
2
45 VHIGH - 0.2
2.7
-0.2
15
5
VHIGH + 0.2
V
5.5
0.2
V
V
100
20
µA
µA
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
February 20, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200709 Rev. F
Data Sheet • SKY12329-350LF
Typical Performance Data
VCTL = 0 V/5 V, T = 25 °C, PINPUT = 0 dBm, ZO = 50 W, unless otherwise noted
0
1 dB
7 dB
13 dB
19 dB
25 dB
31 dB
-0.4
-1.2
-1.6
-2.0
-2.4
-2.8
-3.2
-3.6
-4.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Attenuation (dB)
Insertion Loss (dB)
-0.8
Frequency (GHz)
Insertion Loss vs. Frequency
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
0
0.5
2 dB
8 dB
14 dB
20 dB
26 dB
1.0
3 dB
9 dB
15 dB
21 dB
27 dB
1.5
2.0
4 dB
10 dB
16 dB
22 dB
28 dB
2.5
3.0
5 dB
11 dB
17 dB
23 dB
29 dB
3.5
6 dB
12 dB
18 dB
24 dB
30 dB
4.0
4.5
Frequency (GHz)
attenuation vs. Frequency1
1 dB
7 dB
13 dB
0
2 dB
8 dB
14 dB
3 dB
9 dB
15 dB
4 dB
10 dB
5 dB
11 dB
6 dB
12 dB
-15
18 dB
24 dB
30 dB
19 dB
25 dB
31 dB
20 dB
26 dB
21 dB
27 dB
-19
Attenuation (dB)
-4
Attenuation (dB)
17 dB
23 dB
29 dB
-17
-2
-6
-8
-10
-12
-21
-23
-25
-27
-29
-31
-14
-16
16 dB
22 dB
28 dB
-33
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency (GHz)
vs. Frequency1
attenuation
1–15 dB
4.5
-35
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Frequency (GHz)
attenuation vs. Frequency1
16–31 dB
1. Attenuation normalized to insertion loss
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200709 Rev. F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 20, 2009
3
Data Sheet • SKY12329-350LF
0
3 dB
9 dB
15 dB
21 dB
27 dB
2 dB
8 dB
14 dB
20 dB
26 dB
1 dB
7 dB
13 dB
19 dB
25 dB
0
-5
-5
-10
-10
-15
-20
-25
-30
-30
-40
1.0
1.5
2.0
2.5
3.0
3.5
4.0
-45
4.5
5 dB
11 dB
17 dB
23 dB
29 dB
4 dB
10 dB
16 dB
22 dB
28 dB
-25
-35
0.5
3 dB
9 dB
15 dB
21 dB
27 dB
-20
-40
-45
2 dB
8 dB
14 dB
20 dB
26 dB
1 dB
7 dB
13 dB
19 dB
25 dB
31 dB
-15
-35
0
Ins. Loss
6 dB
12 dB
18 dB
24 dB
30 dB
5 dB
11 dB
17 dB
23 dB
29 dB
Return Loss (dB)
Return Loss (dB)
4 dB
10 dB
16 dB
22 dB
28 dB
31 dB
Ins. Loss
6 dB
12 dB
18 dB
24 dB
30 dB
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Frequency (GHz)
Frequency (GHz)
Input Return Loss vs. Frequency
Output Return Loss vs. Frequency
Truth Table
4.5
Absolute Maximum Ratings
V1
V2
V3
V4
VHIGH
VHIGH
VHIGH
VHIGH
VHIGH
V5Attenuation
Reference insertion loss
VLOW VHIGH
VHIGH
VHIGH
VHIGH
1 dB
RF input power
VHIGH
VHIGH
VLOW
VHIGH
VHIGH
VHIGH
2 dB
Control voltage range
-0.2 < VC < 8 V
VHIGH
VLOW
VHIGH
VHIGH
4 dB
Operating temperature range
-40 °C to +85 °C
VHIGH
VHIGH
VHIGH
VLOW
VHIGH
8 dB
Storage temperature range
-65 °C to +150 °C
VHIGH
VHIGH
VHIGH
VHIGH
VLOW
16 dB
VLOW
VLOW
VLOW
VLOW
VLOW
31 dB
2.7 V < VHIGH < 5.5 V, VS = VHIGH ± 0.2 V, 0 < VLOW < 0.2 V.
Part Marking
Lot Number
S329
XXXX
YWW
Part No.
Date Code
Y = Calendar Year
WW = Week
Characteristic
Value
33 dBm for f > 400 MHz, VCTL = 0/8 V
Performance is guaranteed only under the conditions listed in the specifications table and is
not guaranteed under the full range(s) described by the Absolute Maximum specifications.
Exceeding any of the absolute maximum/minimum specifications may result in permanent
damage to the device and will void the warranty.
CAUTION: A lthough this device is designed to be as robust as
possible, ESD (Electrostatic Discharge) 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 must be employed
at all times.
Recommended Solder Reflow Profiles
Refer to the “Recommended Solder Reflow Profile”
Application Note.
Tape and Reel Information
Refer to the “Discrete Devices and IC Switch/Attenuators
Tape and Reel Package Orientation” Application Note.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
February 20, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200709 Rev. F
Data Sheet • SKY12329-350LF
Pin Out
SKY12329-350LF Evaluation Circuit PCB
15
14
13
GND
1
12
V5
RF1
2
11
RF2
NC
3
10
NC
GND
4
9
GND
5
6
7
8
GND
GND
GND
GND
V5
16
V4
V4
V3
V3
V2
V1
V2
VSS
V1
Pin Descriptions
Pin Number
1, 4–9
2
3, 10
11
12
Pin Name
Description
GNDEquipotential Point—Equipotential points for
control voltages and RF circuits. Must be
connected to PCB ground via lowest possible
N/C
V1
VS
R1
RF1RF Input/Output—RF input or output port.
A DC block is required for this port.
R2
V2
R3
16
V3
R4
15
V4
V5
R5
14
R6
13
No connection
1
RF2RF Input/Output—RF input or output port.
A DC block is required for this port.
RF1
13
V4Control Voltage—Control voltage input for
8 dB weighted bit
14
V3Control Voltage—Control voltage input for
4 dB weighted bit
15
V2Control Voltage—Control voltage input for
2 dB weighted bit
16
V1Control Voltage—Control voltage input for
1 dB weighted bit (LSB)
The evaluation board for SKY12329-350LF allows the part to
be fully exercised. The insertion loss of the transmission lines
between J1–U1 and U1–J2 can be determined by measuring the
performance of the calibration through line, which contains two
DC block capacitors (560 pF) in identical positions to the DC
blocks present in the main circuit.
The state of the SKY12329-350LF is controlled by applying the
appropriate logic level voltages to ports V1 through V5, per the
Truth Table
12
C1
2
V5Control Voltage—Control voltage input for
16 dB weighted bit (MSB)
Evaluation Board
SKY12329-350LF Evaluation Circuit
NC
3
10
4
9
5
6
7
C2
11
SKY1329-350LF
RF2
NC
8
C3
C4
Through Line
Evaluation Board Components
Component
Description
Default
C1–C4
DC blocking capacitor
560 pF, size 0402
R1
RF block
10k W, size 0402
R2–R6
Current limiting
100 W
U1
J1, J2 SKY12329-350LF GaAs digital attenuator
SMA connectors
CAUTION: A lthough this device is designed to be as robust as
possible, ESD (Electrostatic Discharge) 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 must be employed
at all times.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200709 Rev. F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 20, 2009
5
Data Sheet • SKY12329-350LF
Land Pattern
-350 (QFN 3 x 3)
16X 1.10
0.008 (0.20 mm)
Seating Plane
0.118 (3.00 mm)
Pin 1
Indicator
0.225 X 45°
0.001
(0.02 mm)
0.118
(3.00 mm)
0.25
1.70
0.067 (1.70 mm)
± 0.004 (0.10 mm)
4x Plated
Exposed Pad
0.029
(0.73 mm)
0.030 (0.75 mm)
± 0.002 (0.05 mm)
Thru Via
12X 0.50
Pitch
See Detail A
0.067 (1.70 mm)
± 0.004 (0.10 mm)
0.059
(1.500 mm)
Metal Gnd Pad 1.70
0.059 (1.500 mm)
0.25
Exposed
Solder Area
0.60
Detail A
6
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
February 20, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200709 Rev. F
Data Sheet • SKY12329-350LF
Copyright © 2007, 2008, 2009, 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,
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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
200709 Rev. F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 20, 2009
7