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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, 3rd Order Input Intercept Point (IIP3) mixer * 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
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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 PD PIN RTH TOPR TSTG
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 VDD PD TOPR -40 Symbol Minimum 4.75 Typical 5.0 1.1 +85 Maximum 5.25 Units V W C
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.
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
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PRELIMINARY DATA SHEET * SKY42068 ACTIVE MIXER
Table 4. SKY42068 Electrical Specifications (voltage supply = +5 V, TC = +25 C, LO = 0 dBm, RF frequency = 900 MHz, IF frequency = 71 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 leakage (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 40 0
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 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.
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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 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 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
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 TB1 Balun LDB31900M05C-417
1 2 3
CB4 1000 pF
1
CB5 33 pF
RB1 5 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
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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 CB5 CB8 CB4 CB6 LB2 LB3 CB7 LB4 CB1
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
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PRELIMINARY DATA SHEET * SKY42068 ACTIVE MIXER
Table 5. SKY42068 Evaluation Board Component Values (900 MHz)
Reference Designator C1, C3, C10, C11, CA1, CA2, CA3, CA4, CA5, CA6, CA7, CA8, CB1, CB7, CB8, J4, J5, LA1, LA2, LA3, LA4, RA1, TA1, TA2 C2, C4, C5, CB2, CB5 C6, CB3, CB4 C9 CB6 J1 J2 J3, J6, J7, J8 L1, L2, LB3, LB4 LB1 LB2 RB1 TB1 TB2 U1 Quantity 24 DNI Value Manufacturer Part Number
5 3 1 1 1 1 4 4 1 1 1 1 1 1
33 pF 1000 pF 12 pF 10 pF Two-pin header connector Jumper SMA connector 0 12 nH 27 nH 5 1:1 (800-1000 MHz) 4:1 (3-800 MHz) - Murata Mini-Circuits Skyworks LDB31900M05C-417 TC4-1W SKY42068-11
Power Supply
Signal Generator
LO1
VDD GND
IF
Spectrum Analyzer
LO2 50
SKY42068 Evaluation Board
RF
Signal Generator
Figure 5. SKY42068 Evaluation Board Mixer Testing Configuration
S738
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PRELIMINARY DATA SHEET * SKY42068 ACTIVE MIXER
Index Area (2.50 x 2.50)
5.00 2.50
A
0.20 Ref
C
3.15 +0.10/-0.15 0.02 +0.03/-0.02 1.575 +0.050/-0.075 Detail A (4 places)
Seating Plane
B 20 x 0.55 +0.10/-0.10 2.50
5.00
B
Index Area (2.50 x 2.50) 0.90 0.10 0.15 C 2x 2x 0.10 C 3 0.08 C 20x 1.575 +0.050/-0.075 A 20 x 0.30 0.05 0.10 M A B C 0.05 M C
Top View
Side View
1.30
0.65
Bottom View
All dimensions are in millimeters
Detail A
3.15 +0.10/-0.15
S745
0.65
Figure 6. SKY42068 20-Pin QFN Package Dimensions
4.00
1.50 +0.1/-0.0
8.00
0.30 0.05
2.00 0.05
1.50 Min
A
1.75 0.10
R0.30 Max 5.50 0.05 12.0 0.30 5.25
1.10
5.25 0.25
A
Section A-A
R0.25 Notes: 1. Carrier tape: black conductive polycarbonate or polystyrene. 2. Cover tape material: transparent conductive PSA. 3. All dimensions are in millimeters.
S379
Figure 7. SKY42068 20-Pin QFN Tape and Reel Dimensions
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
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PRELIMINARY DATA SHEET * SKY42068 ACTIVE MIXER
Ordering Information
Model Name SKY42068 Active Mixer Manufacturing Part Number SKY42068-11 (Pb-free package) Evaluation Kit Part Number TW12-D761
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