DATA SHEET
SKY73421-11: 1400 to 2000 MHz Broadband, Application
Configurable High Gain and Linearity Diversity
Downconversion Mixer
Applications
IFA+
2G/3G/4G base station transceivers:
GSM/EDGE, CDMA, UMTS/WCDMA, LTE
Land mobile radio
High performance radio links
IFA–
RLOA
BS0
RIFA
BS1
RFA
Features
LO
Operating frequency range: 1400 to 2000 MHz
IF frequency range: 150 to 320 MHz
Conversion gain: 9 dB
Input IP3: up to +29.5 dBm
Output IP3: up to +38.5 dBm
Noise Figure: 9 dB
Power-down mode
Integrated LO drivers
Integrated low loss RF baluns
High linearity IF amplifiers
Application tuneability
Small, QFN (36-pin, 6 x 6 mm) package (MSL3, 260 C per
JEDEC J-STD-020)
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
RFB
PWRDN
RIFB
IFB+
IFB–
RLOB
S2760
Figure 1. SKY73421-11 Block Diagram
Description
The SKY73421-11 is a fully integrated diversity mixer that
includes Local Oscillator (LO) drivers, high linearity mixers, and
large dynamic range Intermediate Frequency (IF) amplifiers. Low
loss RF baluns have also been included to reduce design
complications and lower system cost.
The SKY73421-11 features an IIP3 of +25 dBm and a Noise
Figure (NF) of 9 dB, making the device an ideal solution for high
dynamic range systems such as 2G/3G/4G base station receivers.
The SKY73421-11 has been designed for optimum long-term
reliability. The SKY73421-11 diversity downconversion mixer is
provided in a compact, 36-pin Quad Flat No-Lead (QFN) package.
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.
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VCC_RFA
RIFA
N/C
IFA–
IFA+
N/C
VCC_IFA
RLOA
N/C
DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
36
35
34
33
32
31
30
29
28
RFA
1
27
N/C
GND
2
26
N/C
GND
3
25
BS1
VCC_LO
4
24
BS0
Ground Pad
GND
RFB
9
19
LO
10
11
12
13
14
15
16
17
18
N/C
VCC_LOIN
20
RLOB
21
8
N/C
7
GND
VCC_IFB
GND
IFB–
PWRDN
IFB+
N/C
22
N/C
23
6
RIFB
5
VCC_RFB
N/C
VCC_LO
S2761
Figure 2. SKY73421-11 Pinout – 36-Pin QFN
(Top View)
Table 1. SKY73421-11 Signal Descriptions
Pin #
1
Name
RFA
Description
RF channel A input
Pin #
19
Name
LO
Description
Local oscillator input
2
GND
Ground
20
GND
Ground
3
GND
Ground
21
VCC_LOIN
DC supply, +5 V
4
VCC_LO
DC supply, +5 V
22
PWRDN
Power-down mode enable
5
N/C
No internal connection
23
N/C
No internal connection
6
VCC_LO
DC supply, +5 V
24
BS0
Band select 0 control
7
GND
Ground
25
BS1
Band select 1 control
8
GND
Ground
26
N/C
No internal connection
9
RFB
RF channel B input
27
N/C
No internal connection
10
VCC_RFB
DC supply, +5 V
28
N/C
No internal connection
11
RIFB
IF channel B bias control
29
RLOA
LO channel A bias control
12
N/C
No internal connection
30
VCC_IFA
DC supply, +5 V
13
IFB+
IF channel B positive output
31
N/C
No internal connection
14
IFB–
IF channel B negative output
32
IFA+
IF channel A positive output
15
N/C
No internal connection
33
IFA–
IF channel A negative output
16
VCC_IFB
DC supply, +5 V
34
N/C
No internal connection
17
RLOB
LO channel B bias control
35
RIFA
IF channel A bias control
18
N/C
No internal connection
36
VCC_RFA
DC supply, +5 V
–
Ground pad
Bottom ground pad (Note 1)
Note 1: Bottom ground pad serves as a key electrical and thermal ground.
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Functional Description
LO Buffers
The SKY73421-11 is a high gain diversity mixer, optimized for
base station receiver applications. The device consists of two
diversity channels, each consisting of a low loss RF balun, high
linearity passive mixer, and a low noise IF amplifier.
The LO buffers allow the input power of the SKY73421-11 to be
driven in the range of –6 to +6 dBm. The LO section has been
optimized for 1250 to 1900 MHz. However, the LO can be driven
over a wide frequency range with only slight degradation in
performance.
The SKY73421-11 also includes a power-down feature used to
lower the supply current for standby operation (refer to Tables 4
and 5):
PWRDN Logic:
Mixer State:
High
Standby (low power mode)
Low
Full operation
LO amplifiers are also included that allow the SKY73421-11 to
connect directly to the output of a Voltage Controlled Oscillator
(VCO). This eliminates the extra gain stages needed by most
discrete passive mixers.
RF Baluns and Passive Mixer
The RF baluns provide a single ended input, which can easily be
matched to 50 Ω using a simple matching circuit. The RF baluns
offer very low loss and excellent amplitude and phase balance
over a wide frequency range of 1200 to 2000 MHz.
The high linearity mixer is a passive, double balanced mixer that
provides a very low insertion loss, and excellent 3rd Order Input
Insertion Point (IIP3) and linearity performance.
Additionally, the balanced nature of the mixer provides for
excellent port-to-port isolation.
Bandselect Logic
Pins 17 (RLOB) and 29 (RLOA) allow for external biasing of the LO
driver bias currents to trade off linearity for the core passive mixer
current.
Power-Down Mode
The SKY73421-11 also includes a low current power-down mode
controlled by pin 22 (PWRDN). When this pin is at a logic high
level, the power-down function is enabled with the total mixer
current under 45 mA. PWRDN does not have an internal pull up or
pull down.
IF Amplifier
The SKY73421-11 includes high dynamic range IF amplifiers that
follow the passive mixers in the signal path. The outputs require a
supply voltage connection using inductive chokes. These choke
inductors should be high-Q and have the ability to handle 200 mA
or greater.
A simple matching network allows the output ports to be matched
to a balanced 200 impedance. The IF amplifiers are optimized
for IF frequencies between 100 and 350 MHz. The IF amplifiers
can be operated outside of this range, but with a slight
degradation in performance.
Pins 11 (RIFB) and 35 (RIFA) allow for external biasing of the IF
amplifier bias currents to trade off linearity for the IF amplifer
current.
The SKY73421-11 is designed to optimize performance in four
sub-bands. The particular sub-band of interest is selected by
setting pin 24 (BS0) and pin 25 (BS1). The bandselect logic is
provided in Table 2.
Electrical and Mechanical Specifications
Depending on the LO injection side, and the RF and IF frequencies
involved, there could be multiple bandselect solutions. Table 5
identifies recommended bandselects for a number of frequency
ranges.
The absolute maximum ratings of the SKY73421-11 are provided
in Table 3. The recommended operating conditions are specified
in Table 4 and electrical specifications are provided in Tables 5
and 6.
Table 2. SKY73421-11 Bandselect Logic
BS1
(Pin 25)
BS0
(Pin 24)
LO Center Frequency
(MHz)
0
0
1250
0
1
1500
1
0
1700
1
1
1750
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Table 3. SKY73421-11 Absolute Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Units
4.5
5.5
V
Supply voltage, +5 V
(VCC_LO, VCC_RFA, VCC_RFB, VCC_IFA, VCC_IFB, VCC_LOIN)
VCC
Total supply current:
IFA+ (pin 32)
IFA– (pin 33)
IFB+ (pin 13)
IFB– (pin 14)
VCC_LO (pin 4)
VCC_LO (pin 6)
VCC_LOIN (pin 21)
VCC_IFA (pin 30)
VCC_IFB (pin 16)
ICC
360
32
32
32
32
82
82
28
20
20
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
RF input power
PRF
+20
dBm
LO input power
PLO
Operating case temperature
TC
Junction temperature
TJ
Storage case temperature
TSTG
Thermal resistance
ΘJC
Electrostatic discharge:
ESD
–40
–40
Charged Device Model (CDM), Class 4
Human Body Model (HBM), Class 1C
Machine Model (MM), Class A
+20
dBm
+100
C
+125
C
+150
C
10.4
C/W
1000
1000
50
V
V
V
Notes: 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 4. SKY73421-11 Recommended Operating Conditions
Parameter
Symbol
Minimum
Typical
Maximum
Units
RF frequency range
fRF
1425
1980
MHz
LO frequency range
fLO
1100
1900
MHz
350
MHz
5.25
V
IF frequency range
fIF
100
Supply voltage, +5 V
VCC
4.75
Supply current (Note 1), PWRDN = 0 V
ICC
LO input power
PLO
Logic levels (Note 2):
high
low
VIN_H
VIN_L
Logic input current
IL
Operating case temperature (Note 3)
TC
5.00
310
–6
0
1.09
0
mA
+6
dBm
VCC
0.74
V
V
0
–40
mA
+100
Note 1: With RIFA/B and RLOA/B bias resistors to ground = 8.2 kΩ.
Note 2: Logic signals are: PWRDN, BS0, and BS1. Valid logic levels must be applied. There are no internal pull-ups or pull-downs.
Note 3: Case temperature measured at bottom of package where device is soldered to board.
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Table 5. SKY73421-11 Electrical Specifications (Note 1)
(VCC = 4.75 to 5.25 V, TC = –40 to +100 C, PLO = –3 to +3 dBm, PWRDN = Logic “0,” BS0/BS1 = Logic “1,” PRF = –10 dBm,
fIF = 200 MHz, Unless Otherwise Noted)
Test Condition
Parameter
Symbol
Conversion gain
Operating current
BS1
BS0
Min
Typical
Max
Units
1427 to 1463
high side
1
1
7.5
9.8
dB
1710 to 1785
low side
1
0
7.5
9.2
dB
1850 to 1915
low side
1
1
7.5
8.9
dB
7.5
1920 to 1980
low side
1
1
1427 to 1463
high side
1
1
8.4
8.8
11.0
dB
dB
1710 to 1785
low side
1
0
8.7
11.0
dB
1850 to 1915
low side
1
1
9.1
11.0
9.3
11.0
NF
3rd Order Input
Intercept Point
(two tones, 800 kHz
separation)
3RF – 3LO
LO
Injection
G
Noise Figure
2RF – 2LO
RF Frequency
Range (MHz)
IIP3
1920 to 1980
low side
1
1
1427 to 1463
high side
1
1
+23.5
+25.0
dBm
1710 to 1785
low side
1
0
+23.5
+25.9
dBm
+23.5
+26.1
dBm
+29.5
dBm
+25.7
dBm
1850 to 1915
low side
1
1
1850 to 1980
(Note 2)
low side
1
1
1920 to 1980
low side
1
1
1427 to 1463
high side
1
1
–69
–63
dBc
1710 to 1785
low side
1
0
–70
–63
dBc
1850 to 1915
low side
1
1
–74
–63
dBc
1920 to 1980
low side
1
1
–74
–63
dBc
1427 to 1463
high side
1
1
–99
–70
dBc
1710 to 1785
low side
1
0
–99
–70
dBc
1850 to 1915
low side
1
1
–88
–70
dBc
1920 to 1980
low side
1
1
–88
–70
dBc
1427 to 1463
high side
1
1
310
325
mA
1710 to 1785
low side
1
0
294
310
mA
1850 to 1915
low side
1
1
302
315
mA
1920 to 1980
low side
1
1
308
325
mA
+23.5
2x2
3x3
ICC_ON
Note 1: Performance is guaranteed only under the conditions listed in this Table. Production tested: RF frequency = 1880 MHz, LO frequency= 1680 MHz. All others guaranteed by design and
characterization. Testing conducted with balun on IF output (see Figure 5). Table 1 performance is of the DUT, with balun loss de-embedded.
Input matching can be unique for each bandselect setting.
Conditions for typical values: VCC = 5 V, TC = +35 C, PLO = 0 dBm, middle of RF range.
The following bias resistors are used for the corresponding frequencies. Each of the fRF ranges have their own RF/LO/IF matching:
fRF = 1427 to 1463 MHz, high side LO injection: RIF = 8.2 kΩ, RLO = 8.2 kΩ
fRF = 1710 to 1785 MHz, low side LO injection: RIF = 2 kΩ, RLO = 8.2 kΩ
fRF = 1850 to 1920 MHz, low side LO injection: RIF = 2 kΩ, RLO = 18 kΩ
fRF = 1920 to 1980 MHz, low side LO injection: RIF = 1 kΩ, RLO = DNI
RIF bias resistors (RIFA and RIFB) are noted R31 and R35 on schematic and Evaluation Board.
RLO bias resistors (RLOA and RLOB) are noted R29 and R37 on schematic and Evaluation Board.
Note 2: External bias resistors for IF and LO (RIF and RLO of Note 1) are not installed.
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Table 6. SKY73421-11 Electrical Specifications (Note 1)
(VCC = 4.75 to 5.25 V, TC = –40 to +100 C, PLO = –3 to +3 dBm, PWRDN = Logic “0,” BS0/BS1 = Logic “1,” PRF = –10 dBm,
fIF = 200 MHz, Unless Otherwise Noted)
Parameter
Symbol
Noise Figure with a blocker signal (Note 2)
NFBLK
Input 1 dB compression point
IP1dB
Test Condition
Min
Blocking signal input
power = +8 dBm,
5 MHz offset
Typical
Max
Units
21
25
dB
+10.0
+12.6
dBm
Channel-to-channel isolation
40
57
dB
RF to IF isolation
30
66
dB
LO leakage:
1xLO to RF port
2xLO to RF port
3xLO to RF port
4xLO to RF port
1xLO to IF port
Power-down current
IOFF
PWRDN = 1
–44
–38
–56
–56
–60
–25
–25
–28
–25
–23
dBm
dBm
dBm
dBm
dBm
37
45
mA
Power-up time (Note 2) (Note 3)
tON
0.42
1
μs
Power-down time (Note 2) (Note 4)
tOFF
0.10
1
μs
RF port input return loss (Note 2)
ZIN_RF
With external matching
components
14
dB
LO port input return loss (Note 2)
ZIN_LO
With external matching
components
14
dB
IF port input return loss (Note 2)
ZOUT_IF
With external matching
components
14
dB
Note 1: Performance is guaranteed only under the conditions listed in this Table. Production tested: RF frequency = 1880 MHz, LO frequency= 1680 MHz. All others guaranteed by design and
characterization. Testing conducted with balun on IF output (see Figure 5). Table 1 performance is of the DUT, with balun loss de-embedded.
Input matching can be unique for each bandselect setting.
Conditions for typical values: VCC = 5 V, TC = +35 C, PLO = 0 dBm, middle of RF range.
The following bias resistors are used for the corresponding frequencies and each of the fRF ranges have their own RF/LO/IF matching:
fRF = 1427 to 1463 MHz, high side LO injection: RIF = 8.2 kΩ, RLO = 8.2 kΩ
fRF = 1710 to 1785 MHz, low side LO injection: RIF = 2 kΩ, RLO = 8.2 kΩ
fRF = 1850 to 1920 MHz, low side LO injection: RIF = 2 kΩ, RLO = 18 kΩ
fRF = 1920 to 1980 MHz, low side LO injection: RIF = 1 kΩ, RLO = DNI
RIF bias resistors are noted R31 and R35 on schematic and Evaluation Board.
RLO bias resistors are noted R29 and R37 on schematic and Evaluation Board.
Note 2: Not production tested. Guaranteed by design and characterization.
Note 3: Time required for IF envelope to reach 90% of final value following a PWRDN transition to logic “0” with tFALL < 1 ns.
Note 4: Time required for IF envelope to reach 10% of final value following a PWRDN transition to logic “1” with tRISE < 1 ns.
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Evaluation Board Description
The SKY73421-11 Evaluation Board is used to test the
performance of the SKY73421-11 downconversion mixer. An
assembly drawing for the Evaluation Board is shown in Figure 3
and the layer detail is provided in Figure 4. A schematic diagram
of the SKY73421-11 Evaluation Board is shown in Figure 5.
Circuit Design Considerations
The following design considerations are general in nature and
must be followed regardless of final use or configuration:
6. Components R29, R33, R34, and R37 (see Figure 5) allow for
external adjustment of the LO driver bias currents. Skyworks
recommends that these resistors have a tolerance of ±1
percent to optimize performance consistency of the
SKY73421-11. These resistors are optional for device
operation, but the performance in Tables 5 and 6 is specified
for the values of the RLO resistors (R29 and R37) as indicated
in the Tables.
7. It is recommended to apply solder paste with stencil, as noted
in Figure 6.
1. Paths to ground should be made as short as possible.
2. The ground pad of the SKY73421-11 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 device. Therefore, design the connection to the
ground pad to dissipate the maximum wattage produced by
the circuit board.
3. Skyworks recommends including external bypass capacitors
on the VCC voltage inputs of the device.
4. Components L12, L13, L14, and L15 (see Figure 5) are high-Q
low loss inductors. These inductors must be able to pass
currents in excess of 200 mA DC.
5. Components R8, R9, R31, and R35 (see Figure 5) allow for
external adjustment of the IF amplifier bias currents.
Skyworks recommends that these resistors have a tolerance
of 1% to optimize performance consistency of the
SKY73421-11. These resistors are optional for device
operation, but the performance in Tables 5 and 6 is specified
for the values of the RIF resistors (R31 and R35) as indicated
in the Tables.
Package Dimensions
The PCB layout footprint for the SKY73421-11 is provided in
Figure 6. Figure 7 shows the package dimensions for the 36-pin
QFN and Figure 8 provides the tape and reel dimensions.
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 SKY73421-11 is rated to Moisture Sensitivity Level 3 (MSL3)
at 260 C. It can be used for lead or lead-free soldering. For
additional information, refer to the Skyworks Application Note,
PCB Design & SMT Assembly/Rework Guidelines for MCM-L
Packages, document number 101752.
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.
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
J6
J7
J4
J1
J3
S2988
Figure 3. SKY73421-11 Evaluation Board Assembly Diagram
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Top Layer
Ground Plane
Power Plane
Bottom Layer
S2989
Figure 4. SKY73421-11 Evaluation Board Layer Detail
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DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
1
R24
0Ω
L2
39 nH
6
3
4
2
3
C1
2.2 μF
Chan. A IF
Output
C24
7.5 pF
1
+5 V Supply
J6
2
+5 V Supply
J2
T1
C37
DNI
L14
390 nH
+5 V Supply
L15
390 nH
+5 V Supply
+5 V Supply
Channel A IF Bias
R9
DNI
C23
15 pF
R31
2 kΩ
C11
2.2 nF
C53
470 nF
C47
2.2 μF
R33
DNI
+5 V Supply
C33
22 pF
C39
2.7 nH
J7
36
3
4
+5 V Supply
×
C19
15 pF
5
6
7
8
+5 V Supply
C2
2.2 nF
C18
15 pF
10
L3
1.5 pF
+5 V Supply
N/C
N/C
BS1
BS0
N/C
PWRDN
VCC_LOIN
GND
LO
27
26
25
+5 V Supply
R12
100 kΩ
×
J5
24
23
22
×
×
R2
DNI
×
1
×
2
+5 V Supply
R13
100 kΩ
21
+5 V Supply
20
C14
33 pF
19
C16
1 μF
J4
LO Input
11 12 13 14 15 16 17 18
Chan. B Input
R1
100 kΩ
R21
DNI
35 34 33 32 31 30 29 28
RFA
GND
GND
VCC_LO
N/C
VCC_LO
GND
GND
RFB
C30
22 pF
C27
2.7 nH
J1
9
R29
8.2 kΩ
×
VCC_RFA
RIFA
N/C
IFA–
IFA+
N/C
VCC_IFA
RLOA
N/C
1
×
VCC_RFB
RIFB
N/C
IFB+
IFB–
N/C
VCC_IFB
RLOB
N/C
L8
DNI
2
C5
2.2 nF
×
Bottom Ground
Pad
Chan. A Input
L9
1.5 pF
+5 V Supply
Channel A LO Bias
C25
15 pF
C13
22 pF
× Channel B LO Bias
L4
DNI
+5 V Supply
R34
DNI
R37
8.2 kΩ
+5 V Supply
+5 V Supply
C20
15 pF
C22
15 pF
C10
2.2 nF
C54
470 nF
C48
2.2 μF
Channel B IF Bias
+5 V Supply
R8
DNI
R35
2 kΩ
L12
390 nH
+5 V Supply
L13
390 nH
1
T1
6
R19
0Ω
L1
39 nH
J3
Chan. B IF
Output
2
+5 V Supply
3
4
C21
7.5 pF
C36
DNI
Notes: Some component labels may be different than the
corresponding component symbol shown here.
Component values, however, are accurate as of the
date of this Data Sheet.
Y0067
Figure 5. SKY73421-11 Evaluation Board Schematic
Table 7. RF and IF Matching Components
Band Selects
RF Range
(MHz)
IF Matching Components
(IF = 200 MHz)
RF Matching Components
IF
Bias
LO
Bias
BS1
BS0
R2
R12
L9,
L3
C39,
C27
L8,
L4
C33,
C30
L2,
L1
C24,
C21
R24,
R19
C37,
C36
R31,
R35
R29,
R37
1427 to 1463
1
1
100 kΩ
DNI
DNI
22 pF
8.2 nH
22 pF
27 nH
6.8 pF
0Ω
DNI
8.2 kΩ
8.2 kΩ
1710 to 1785
1
0
DNI
100 kΩ
1.5 pF
2.7 nH
DNI
22 pF
39 nH
7.5 pF
0Ω
DNI
2 kΩ
8.2 kΩ
1850 to 1915
1
1
100 kΩ
DNI
1.5 pF
2.2 nH
DNI
11 pF
39 nH
7.5 pF
0Ω
DNI
2 kΩ
18 kΩ
1920 to 1980
1
1
100 kΩ
DNI
1.2 pF
2.2 nH
DNI
5.1 pF
39 nH
7.5 pF
0Ω
DNI
1 kΩ
DNI
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November 8, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202965B
9X 2.03
9X 1.52
9X 1.02
Pin 36
6.40
4.60
9X 2.03
9X 1.52
9X 1.02
9X 0.51
0
9X 0.51
9X 1.02
9X 1.52
9X 2.03
6.40 4.60
0.650 Typ.
0.250 Typ.
0.500 Typ.
2
3
0
7
20
81X ∅0.25
0
Pin 1
Board Metal
Pin 36
6.50
4.40
Pin 1
9X 0.51
0
9X 0.51
9X 1.02
9X 1.52
9X 2.03
DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Via Pattern
(Note 1)
6.40
Pin 36
0.20 Typ.
Pin 1
3X 1.20
0.20 Typ.
0.20 Typ.
6.50 4.40
6.40
3X 1.20
0.20 Typ.
0.750 Typ.
0.350 Typ.
0.500 Typ.
Solder Mask Pattern
(Note 2)
NOTES:
1. Via hole recommendations:
0.025 mm Cu via wall plating (minimum),
soldermask on the far side should tent
or plug via holes.
2. Soldermask recommendations:
Contact board fabricator for recommended
soldermask offset and tolerance.
3. Stencil recommendations:
0.125 mm stencil thickness, laser cut apertures,
trapezoidal walls and rounded corners offer
better paste release.
Component
Outline
0.650 Typ.
0.250 Typ.
0.500 Typ.
67% solder coverage
on center pad
Stencil Pattern
(Note 3)
Dimension and tolerancing according to ASME Y14.5M-1994.
Unless specified, dimensions are symmetrical about center lines.
All dimensions are in millimeters.
S3158
Figure 6. PCB Layout Footprint for the SKY73421-11 6 x 6 mm QFN
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11
DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
0.850 ± 0.050
2X
A
6.000 ± 0.050
0.15 C
B
36
35
34
33
32
4.600 ± 0.050
0.10 M C A B
See Note 3
0.40 x 45°
0.203 Ref.
31
30
29
28
28
29
30
31
32
33
34
35
36
27
27
1
2
26
26
2
3
25
25
3
4
24
24
4
5
23
23
5
6
22
22
6
7
21
21
7
8
20
20
9
0.15 C
4.600 ± 0.050
6.000 ± 0.050
0.10 M C A B
1
19
10
11
12
13
14
15
16
17
Seating
Plane
0 to 0.05
2X
c
Top View
8
R0.075 Typ.
19
18
18
17
16
15
14
13
9
12
11
10
36 X 0.250 ± 0.050
36X 0.400 ± 0.050
0.10 M C A B
0.05 M C
Side View
Bottom View
NOTES:
1. All measurements are in millimeters.
2. Dimensioning and tolerancing according to ASME Y14.5M-1994.
Unless otherwise specified the following values apply:
Decimal Tolerance:
Angular Tolerance:
X.X (1 place) ± 0.1 mm
±1°
X.XX (2 places) ± 0.05 mm
X.XXX (3 places) ± 0.025 mm
3. Terminal #1 identification mark located within marked area.
4. Unless specified, dimensions are symmetrical about center lines.
Figure 7. SKY73421-11 36-Pin QFN Package Dimensions
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0.500
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S2944
DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
P2
2.00 ± 0.1 (Note 1)
∅1.55 ± 0.05 (Do)
0.30 ± 0.05
Po
4.00 ± 0.1 (Note 2)
E1
1.75 ± 0.1
Y
6.30 ± 0.1 (Bo)
A
Ref
3° .
CL
16.00 ± 0.3
∅1.5 Min. (D1)
7.50 ± 0.1 (Note 1)
Pin 1 Location
1.10 ± 0.1 (Ko)
Y
12.00 ± 0.1 (P1)
Section Y-Y
6.30 ± 0.1 (Ao)
Ref.
R0.5
Notes:
1. Measured from center line of sprocket hole to center line of pocket.
2. Cumulative tolerance of 10 sprocket holes is ± 0.20 mm.
3. Other material available.
Detail A
S2943
All measurements are in millimeters.
Figure 8. SKY73421-11 Tape and Reel Dimensions
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13
DATA SHEET • SKY73421-11 DOWNCONVERSION MIXER
Ordering Information
Model Name
SKY73421-11 1400-2000 MHz Downconversion Mixer
Manufacturing Part Number
SKY73421-11
Evaluation Board Part Number
SKY73421-11-EK1 (1427.9 to 1462.9 MHz)
SKY73421-11-EK3 (1710 to 1785 MHz)
SKY73421-11-EK2 (1850 to 1915 MHz)
SKY73421-11-EK4 (1920 to 1980 MHz)
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information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
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