SKY12329-350LF Datasheet, PDF (5/7 Pages) Skyworks Solutions Inc. – SKY12329-350LF GaAs Digital Attenuator 5-Bit, 1 dB LSB 400 MHz–4 GHz

Data Sheet • SKY12329-350LF
Pin Out
V₁
V₂
V₃
V₄
16
15
14
13
GND 1
RF1 2
12 V₅
11 RF2
NC 3
10 NC
GND 4
5
6
GND GND
7
8
GND GND
9 GND
Pin Descriptions
Pin Number Pin Name
Description
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)
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
SKY12329-350LF Evaluation Circuit PCB
SKY12329-350LF Evaluation Circuit
V_S
V₁ V₂ V₃ V₄
V₅
R₁
R₂ R₃ R₄ R₅
R₆
C1
RF1
16 15 14 13
1
12
C2
2
11
RF2
SKY1329-350LF
NC 3
10 NC
4
9
5
6
7
8
C3
C4
Through Line
Evaluation Board Components
Component
Description
C₁–C₄
R₁
R₂–R₆
U₁
J₁, J₂
DC blocking capacitor
RF block
Current limiting
SKY12329-350LF GaAs digital attenuator
SMA connectors
Default
560 pF, size 0402
10k W, size 0402
100 W
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 • [e-mail] • www.skyworksinc.com
200709 Rev. F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 20, 2009
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