PRELIMINARY DATA SHEET
SKY42068: 400-1000 MHz High Dynamic Range Active Mixer
Applications
•
GSM/EDGE/CDMA/AMPS/TETRA
•
Mobile radio systems
•
Industrial, Scientific, Medical (ISM) band applications
Description
The SKY42068 is an integrated, high-dynamic range low-noise
receiver down converter. It includes a double-balanced active
mixer, Local Oscillator (LO) amplifiers, and dual LO inputs
selected by an external switch interface. The LO switch function is
managed using an externally controlled CMOS-compatible
interface.
The 20-pin Quad Flat No-Lead (QFN) device package and pinout
are shown in Figure 1. Figure 2 shows a functional block diagram
for the SKY42068.
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances) compliant packaging.
Features
•
High, 3 Order Input Intercept Point (IIP3) mixer
rd
•
Wideband RF input frequency range (400 to 1000 MHz)
•
CMOS-compatible control interface
•
+5 V supply operation
•
–40
°C
to +85
°C
operating range
•
Supports frequency hopping applications
•
QFN (20-pin, 5 x 5 mm) Pb-free package (MSL3, 260
°C
per
JEDEC J-STD-020)
GND
20
19
18
17
16
LO_1
GND
LO_SEL
GND
LO_2
GND
VDD
NC
NC
1
2
3
4
5
15
14
13
12
11
NC
NC
NC
IF+
IF–
LO_1
IF
RF
RF Balun
6
7
8
9
10
LO_2
GND
GND
RF+
RF–
GND
S326
LO_SEL
S325
Figure 1. SKY42068 Pinout – 20-Pin QFN
(Top View)
Figure 2. SKY42068 Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
103210D • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 2, 2008
1
PRELIMINARY DATA SHEET • SKY42068 ACTIVE MIXER
Table 1. SKY42068 Signal Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
LO_1
GND
LO_SEL
GND
LO_2
GND
GND
RF+
RF–
GND
Name
Description
Local oscillator 1 input
Ground
Select control for LO_1 and LO_2
Ground
Local oscillator 2 input
Ground
Ground
Positive RF input
Negative RF input
Ground
Pin #
11
12
13
14
15
16
17
18
19
20
IF–
IF+
NC
NC
NC
GND
NC
NC
GND
VDD
Name
Description
Negative IF output
Positive IF output
No connection
No connection
No connection
Ground
No connection
No connection
Ground
Supply voltage
Table 2. SKY42068 Absolute Maximum Ratings
Parameter
Positive DC power supply
Power dissipation
Input power
Thermal resistance
Operating case temperature
Storage case temperature
Note:
Symbol
VDD
P
D
P
IN
R
TH
T
OPR
T
STG
Minimum
Typical
Maximum
5.5
1.7
22
Units
V
W
dBm
°C/W
°C
°C
25
–40
–40
+85
+125
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.
Table 3. SKY42068 Recommended Operating Conditions
Parameter
Positive DC supply voltage
Power dissipation
Operating case temperature
LO_SEL input voltage
VDD
P
D
T
OPR
LO_SEL
H
LO_SEL
L
–40
2.2
0.8
Symbol
Minimum
4.75
Typical
5.0
1.1
+85
Maximum
5.25
Units
V
W
°C
V
V
Functional Description
The SKY42068 consists of a high dynamic active mixer, LO
amplifiers, and a selectable LO input. The SKY42068 was
specifically designed to meet the needs of high performance
receivers.
The mixer shares two independent LO signals, LO_1 and LO_2,
that are selected using a common CMOS-compatible control
signal. With this ability, the device can be used in applications
where frequency hopping is required.
The LO select logic is as follows:
LO_SEL Logic:
High
Low
State:
LO1 enabled (pin 1)
LO2 enabled (pin 5)
Electrical and Mechanical Specifications
Signal pin assignments and functional pin descriptions are
described in Table 1. The absolute maximum ratings of the
SKY42068 are provided in Table 2. The recommended operating
conditions are specified in Table 3 and electrical specifications
are provided in Table 4.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2
May 2, 2008 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 103210D
PRELIMINARY DATA SHEET • SKY42068 ACTIVE MIXER
Table 4. SKY42068 Electrical Specifications
(Voltage Supply = +5 V, T
C
= +25
°C,
LO = 0 dBm, RF Frequency = 900 MHz, IF Frequency = 71 MHz, LO Frequency = 829 MHz, Unless
Otherwise Noted)
Parameter
RF
RF input frequency
RF input VSWR (Note 1)
Mixer (Note 2)
Conversion gain
Single side band noise figure
Input IP3
RF to IF isolation (Note 3)
LO to IF leakage
Input –1 dB compression point
2x2 product suppression (Note 4)
Local Oscillator
LO input frequency (Note 5)
LO input VSWR (Note 1)
LO level input
LO1 to LO2 isolation
Intermediate Frequency
IF output frequency
IF output VSWR (Note 1)
Note 2:
Include RF balun and IF transformer losses.
Note 3:
Measured with an RF input power of –10 dBm.
Note 4:
Measured with an RF input power of –16 dBm.
Note 5:
Use high side LO injection for RF frequencies below 500 MHz.
Symbol
Test Condition
Min
Typical
Max
Units
400
1.5:1
1000
2.0:1
MHz
2.5
9.5
1 MHz tone spacing
36
40
–25
+14
+17
–70
dB
dB
dBm
dBm
dBm
dBm
dBc
450
1.5:1
–5
0
40
1200
2.0:1
+5
MHz
dBm
dB
50
IF = 50 MHz to 200 MHz
1.5:1
250
2.0:1
MHz
Note 1:
In a 50
Ω
system obtained with external matching components on input/output ports.
Evaluation Board Description
The SKY42068 Evaluation Board is used to test the SKY42068
mixer performance. The SKY42068 Evaluation Board schematic
diagram is shown in Figure 3. Figure 4 displays the Evaluation
Board layout. The Bill of Materials (BOM) is provided in Table 5.
Circuit Design Configurations
The following design considerations are general in nature and
must be followed regardless of final use or configuration:
1. Paths to ground should be made as short as possible.
2. The ground pad of the SKY42068 mixer has special electrical
and thermal grounding requirements. This pad is the main
thermal conduit for heat dissipation. Since the circuit board
acts as the heat sink, it must shunt as much heat as possible
from the mixer. As such, design the connection to the ground
pad to dissipate the maximum wattage produced to the circuit
board. Multiple vias to the grounding layer are required.
3. Two external output bypass capacitors are required on the VDD
pin. The values of these capacitors will change with respect to
the desired RF frequency. One capacitor should be used for
low frequency bypassing and the other capacitor for high
frequency bypassing. Special attention should be given so that
the smaller value capacitor does not go into self-resonance at
the desired RF frequency.
4. The RF input must be driven differentially. A 1:1 impedance
ratio balun is recommended with a center tap on the secondary
side that is a DC path to ground.
Mixer Testing Procedure
Use the following procedure to set up the SKY42068 Evaluation
Board for mixer testing. Refer to Figure 5 for guidance:
1. Connect the SKY42068 Evaluation Board (J1) to a +5 VDC
power supply using insulated supply cables. If available,
enable the current limiting function of the power supply to
250 mA.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
103210D • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 2, 2008
3
PRELIMINARY DATA SHEET • SKY42068 ACTIVE MIXER
2. Connect a signal generator to the LO1 input port (J3). Set the
generator to the desired LO frequency at a power level of
0 dBm, but
do not enable.
3. Connect a signal generator to the mixer RF input port (J7). Set
the generator to the desired RF frequency at a power level of
0 dBm, but
do not enable.
4. Connect a spectrum analyzer to the IF output port of the mixer
(J6).
5. Enable the power supply.
6. Enable the LO signal.
7. Enable the RF signal and take measurements.
8. If LO2 is desired, connect the LO signal generator to the LO2
input port (J8) and pull the LO_SEL jumper (J2).
Package and Handling Information
Since the device package is sensitive to moisture absorption, it is
baked and vacuum packed before shipping. 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 SKY42068 is rated to Moisture Sensitivity Level 3 (MSL3) at
260
°C.
It can be used for lead or lead-free soldering.
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,
Tape and Reel,
document number 101568.
Package Dimensions
Figure 6 shows the package dimensions for the 20-pin QFN and
Figure 7 provides the tape and reel dimensions.
Electrostatic Discharge (ESD) Sensitivity
The SKY42068 is a static-sensitive electronic device. Do not
operate or store near strong electrostatic fields. Take proper ESD
precautions.
VDD
C5
33 pF
J3
LO_1 In
SMA
C1
DNI
J2
C6
1000 pF
20
19
18
X
17
X
16
1
2
VDD
L1
0
Ω
C11
DNI
C2
33 pF
1
VDD
GND
NC
NC
GND
LO_1
GND
LO_SEL
GND
LO_2
NC
NC
15
J1
2-Pin Header
X
2
14
X
VDD
J8
LO_2 In
SMA
C3
DNI
C10
DNI
C9
12 pF
L2
0
Ω
C4
33 pF
3
U1
SKY42068
NC
IF+
IF–
13
X
VDD
4
5
12
11
3
GND
GND
GND
RF+
TB2
Balun
TC4-1W
6
LB2
27 nH
CB8
DNI
CB6
10 pF
LB4
0
Ω
J6
IF Out
SMA
RF–
6
7
8
9
10
2
4
J7
RF In
SMA
CB1
DNI
6
LB1
12 nH
CB7
DNI
LB3
0
Ω
TB1
Balun
LDB31900M05C-417
1
2
3
CB4
1000 pF
1
CB5
33 pF
RB1
5
Ω
CB2
33 pF
4
CB3
1000 pF
S737
Figure 3. SKY42068 Evaluation Board Schematic (900 MHz)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
4
May 2, 2008 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 103210D
PRELIMINARY DATA SHEET • SKY42068 ACTIVE MIXER
J4
CA1
J3
C1
L1
C11
C9
RA1
CA2
CA3
C5
C6
C2
LA1
CA7
LA2
LA3
TA1 CA4
LA4
CA6
J5
CA8
TA2
CA5
J2
C10
L2
C3
C4
TB2
U1
TB1
CB3
CB2
RB1
LB1
CB1
CB4
LB3
CB7
LB2
LB4
CB5
CB8
CB6
J1
J8
J6
J7
Component Placement
Top Layer
Layer 2
Layer 3
Bottom Layer
S739
Figure 4. SKY42068 Evaluation Board Assembly Diagram (900 MHz)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
103210D • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 2, 2008
5
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
