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
SKY12329-350LF: GaAs Digital Attenuator
5-Bit, 1 dB LSB 400 MHz–4 GHz
data sheet
Applications
l Transceiver transmit automatic level control or receive auto-
matic gain control in WiMAX, GSM, CDMA, WCDMA, WLAN,
Bluetooth®, Zigbee®, Land Mobile Radio Base stations or
Terminal Equipment
l General purpose signal attenuation in telecommunications and
instrumentation applications
Features
l Broadband: 400 MHz–4 GHz
l Attenuation range: 31 dB
l Least significant bit attenuation: 1 dB
l Low insertion loss: 1.2 dB @ 900 MHz
l Single positive control voltage: 2.7–5.5 V
l Low current consumption: <100 µA @ 5 V
l Small QFN-16 3 x 3 mm package with exposed paddle
l Lead (Pb)-free and RoHS-compliant MSL-1 @ 260 °C
per JEDEC J-STD-020
Functional Block Diagram
RF
Input/Output
RF
Input/Output
16
dB
8
dB
4
dB
2
dB
1 dB
V1
V2
V3
V4
V5
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 pro-
duces 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 associ-
ated attenuator.
DC power consumption is very low, 100 µA maximum with con-
trol 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.
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances)-compliant packaging.
NeW
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
2
Switching characteristics
On/rise time 50/90% or 10/90% RF 150 ns
Off/fall time 50/10% or 90/10% RF 500 ns
Input power for 1 dB compression VLOW = 0 V, VHIGH = 3 V 900 MHz 29 dBm
V
LOW = 0 V, VHIGH = 5 V 900 MHz 31 dBm
Input third order For two input tones. +5 dBm each tone
intermodulation intercept VLOW = 0 V, VHIGH = 3 V 1–4 GHz 39 dBm
V
LOW = 0 V, VHIGH = 5 V 1–4 GHz 41 dBm
Thermal resistance Junction to package terminal 45 °C/W
Supply voltage VHIGH - 0.2 VHIGH + 0.2 V
Control voltage High 2.7 5.5 V
Low -0.2 0.2 V
Control port current VCTL = VHIGH 15 100 µA
V
CTL = VLOW 5 20 µA
Insertion loss 0.4–1.0 GHz 1.2 1.6 dB
1.0–2.0 GHz 1.5 1.9 dB
2.0–3.0 GHz 1.8 2.2 dB
3.0–4.0 GHz 2.7 3.1 dB
Attenuation range 31 dB
Attenuation accuracy Attenuation referred to insertion loss.
All attenuation states 0.4–1.0 GHz ± (0.35 + 3% of attenuation dB
setting in dB)
All attenuation states 1.0–3.0 GHz ± (0.3 + 3% of attenuation dB
setting in dB)
1–15 dB attenuation states 3.0–4.0 GHz ± (0.5 + 5% of attenuation dB
setting in dB)
16–31 dB attenuation states 3.0–4.0 GHz ± (0.6 + 6% of attenuation dB
setting in dB)
Return loss 0.4–1.0 GHz 7 dB
1.0–4.0 GHz 10 dB
Operating Characteristics
VCTL = 0 V/5 V, T = 25 °C, PINPUT = 0 dBm, ZO = 50 W, unless otherwise noted
Electrical Specifications
VCTL = 0 V/5 V, T = 25 °C, PINPUT = 0 dBm, ZO = 50 W, unless otherwise noted
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
Typical Performance Data
VCTL = 0 V/5 V, T = 25 °C, PINPUT = 0 dBm, ZO = 50 W, unless otherwise noted
Frequency (GHz)
Insertion Loss (dB)
0 1.0 2.0 3.0 4.00.5 1.5 2.5 3.5 4.5
-4.0
-3.6
-3.2
-2.8
-2.4
-2.0
-1.6
-1.2
-0.8
-0.4
0
0 1.0 2.0 3.0 4.00.5 1.5 2.5 3.5 4.5
Frequency (GHz)
Attenuation (dB)
31 dB
25 dB 26 dB 27 dB 28 dB 29 dB 30 dB
19 dB 20 dB 21 dB 22 dB 23 dB 24 dB
13 dB 14 dB 15 dB 16 dB 17 dB 18 dB
7 dB 8 dB 9 dB 10 dB 11 dB 12 dB
1 dB 2 dB 3 dB 4 dB 5 dB 6 dB
-32
-30
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0 1.0 2.0 3.0 4.00.5 1.5 2.5 3.5 4.5
Frequency (GHz)
Attenuation (dB)
13 dB 14 dB 15 dB
7 dB 8 dB 9 dB 10 dB 11 dB 12 dB
1 dB 2 dB 3 dB 4 dB 5 dB 6 dB
-16
-14
-12
-10
-8
-6
-4
-2
0
0 1.0 2.0 3.0 4.00.5 1.5 2.5 3.5 4.5
Frequency (GHz)
Attenuation (dB)
31 dB
25 dB 26 dB 27 dB
28 dB 29 dB 30 dB
19 dB 20 dB 21 dB
22 dB 23 dB 24 dB
16 dB 17 dB 18 dB
-35
-33
-31
-29
-27
-25
-23
-21
-19
-17
-15
1. Attenuation normalized to insertion loss
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
4
V
V
V
V
4 V
V
HIGH V
HIGH V
HIGH V
HIGH V
HIGH Reference insertion loss
V
LOW VHIGH V
HIGH V
HIGH V
HIGH 1 dB
V
HIGH V
LOW V
HIGH V
HIGH V
HIGH 2 dB
V
HIGH V
HIGH V
LOW V
HIGH V
HIGH 4 dB
V
HIGH V
HIGH V
HIGH V
LOW V
HIGH 8 dB
V
HIGH V
HIGH V
HIGH V
HIGH V
LOW 16 dB
V
LOW V
LOW V
LOW V
LOW V
LOW 31 dB
Truth Table
2.7 V < VHIGH < 5.5 V, VS = VHIGH ± 0.2 V, 0 < VLOW < 0.2 V.
RF input power 33 dBm for f > 400 MHz,
V
CTL = 0/8 V
Control voltage range -0.2 < VC < 8 V
Operating temperature range -40 °C to +85 °C
Storage temperature range -65 °C to +150 °C
Absolute Maximum Ratings
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: Although 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.
0 1.0 2.0 3.0 4.00.5 1.5 2.5 3.5 4.5
Frequency (GHz)
Return Loss (dB)
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Ins. Loss1 dB
2 dB3 dB
4 dB 5 dB
6 dB 7 dB8 dB9 dB
10 dB 11 dB
12 dB 13 dB14 dB
15 dB16 dB 17 dB
18 dB 19 dB20 dB
21 dB
22 dB 23 dB
24 dB 25 dB26 dB
27 dB
28 dB 29 dB
30 dB 31 dB
0 1.0 2.0 3.0 4.00.5 1.5 2.5 3.5 4.5
Frequency (GHz)
Return Loss (dB)
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Ins. Loss1 dB 2 dB 3 dB 4 dB 5 dB
6 dB 7 dB 8 dB 9 dB 10 dB 11 dB
12 dB 13 dB 14 dB 15 dB 16 dB 17 dB
18 dB 19 dB 20 dB 21 dB 22 dB 23 dB
24 dB 25 dB 26 dB 27 dB 28 dB 29 dB
30 dB 31 dB
Part No.
Lot Number
Date Code
Y = Calendar Year
WW = Week
S329
XXXX
YWW
Part Marking
Recommended Solder Reflow Profiles
Refer to the “Recommended Solder Reflow Profile”
Application Note.
T
ape and Reel Information
Refer to the “Discrete Devices and IC Switch/Attenuators
Tape and Reel Package Orientation” Application Note.
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
1, 4–9 GND Equipotential Point—Equipotential points for
control voltages and RF circuits. Must be
connected to PCB ground via lowest possible
2 RF1 RF Input/Output—RF input or output port.
A DC block is required for this port.
3, 10 N/C No connection
11 RF2 RF Input/Output—RF input or output port.
A DC block is required for this port.
12 V5 Control Voltage—Control voltage input for
16 dB weighted bit (MSB)
13 V4 Control Voltage—Control voltage input for
8 dB weighted bit
14 V3 Control Voltage—Control voltage input for
4 dB weighted bit
15 V2 Control Voltage—Control voltage input for
2 dB weighted bit
16 V1 Control Voltage—Control voltage input for
1 dB weighted bit (LSB)
Pin Descriptions
V1
VSS
V2
V4
V3
V5
Pin Out SKY12329-350LF Evaluation Circuit PCB
V1V2V3V4V5
Through Line
1316 15 14
12
11
10
9
765
1
2
3
4
8
RF2RF1
NC
VS
R1R2R3R4R5R6
C1
C3 C4
C2
SKY1329-350LF
NC
SKY12329-350LF Evaluation Circuit
Evaluation Board
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
CAUTION: Although 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.
C
1–C4 DC blocking capacitor 560 pF, size 0402
R
1 RF block 10k W, size 0402
R
2–R6 Current limiting 100 W
U
1 SKY12329-350LF GaAs digital attenuator
J
1, J2 SMA connectors
Evaluation Board Components
1316 15 14
12
11
10
9
765
1
2
3
4
8
GND
GND
GND GND GNDGND
GND
V1V2V3V4
V5
RF2RF1
NCNC
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
6
Exposed Pad
0.008 (0.20 mm)
Seating Plane
0.001
(0.02 mm)
0.030 (0.75 mm)
± 0.002 (0.05 mm)
0.118
(3.00 mm)
0.118 (3.00 mm)
Pin 1
Indicator
0.059
(1.500 mm)
0.059 (1.500 mm)
0.029
(0.73 mm)
0.067 (1.70 mm)
± 0.004 (0.10 mm)
0.067 (1.70 mm)
± 0.004 (0.10 mm)
-350 (QFN 3 x 3)
0.60
Detail A
Exposed
Solder Area
4x Plated
Thru Via
0.25
See Detail A
16X 1.10
0.25
12X 0.50
Pitch
Metal Gnd Pad 1.70
0.225 X 45°
1.70
Land Pattern
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
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