HMC908A [ADI]

9 GHz to 12 GHz,GaAs, MMIC, I/Q Downconverter;
HMC908A
型号: HMC908A
厂家: ADI    ADI
描述:

9 GHz to 12 GHz,GaAs, MMIC, I/Q Downconverter

文件: 总26页 (文件大小:784K)
中文:  中文翻译
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9 GHz to 12 GHz,  
GaAs, MMIC, I/Q Downconverter  
HMC908A  
Data Sheet  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Conversion gain: 11 dB (typical) at IFOUT = 100 MHz  
Image rejection: 25 dB (typical) at IFOUT = 100 MHz  
LO to RF isolation: 46 dB (typical)  
LO to IF isolation: 26 dB (typical)  
IF output frequency: dc to 3.5 GHz  
32 31 30 29 28 27 26 25  
24  
23  
22  
21  
20  
19  
18  
17  
1
2
3
4
5
6
7
8
NIC  
GND  
RF  
NIC  
NIC  
NIC  
GND  
IF1  
–90  
0
GND  
NIC  
VD3  
NIC  
NIC  
32-lead, 4.9 mm × 4.9 mm ceramic leadless chip carrier  
GND  
IF2  
APPLICATIONS  
GND  
Point to point radios  
Point to multipoint radios and very small aperture terminals  
(VSATs)  
Test equipment and sensors  
Military end use  
HMC908A  
PACKAGE  
BASE  
9
10 11 12 13 14 15 16  
GND  
Figure 1.  
GENERAL DESCRIPTION  
The HMC908A is a compact, gallium arsenide (GaAs),  
image rejection mixer eliminates the need for a filter following  
the LNA, and removes thermal noise at the image frequency.  
I and Q mixer outputs are provided and an external 90° hybrid  
is needed to select the required sideband. The HMC908A is a  
much smaller alternative to hybrid style image rejection mixer  
downconverter assemblies, and it eliminates the need for wire  
bonding by allowing the use of surface-mount manufacturing  
techniques.  
monolithic microwave integrated circuit (MMIC), inphase/  
quadrature (I/Q) downconverter in a leadless, RoHS compliant  
ceramic leadless chip carrier. This device provides a small signal  
conversion gain of 11 dB with a noise figure of 2 dB and 25 dB  
of image rejection at 100 MHz. The HMC908A utilizes a low  
noise amplifier (LNA) followed by an image rejection mixer  
that is driven by a local oscillator (LO) buffer amplifier. The  
Rev. 0  
Document Feedback  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registered trademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Technical Support  
©2019 Analog Devices, Inc. All rights reserved.  
www.analog.com  
 
 
 
 
 
HMC908A  
Data Sheet  
TABLE OF CONTENTS  
Features .............................................................................................. 1  
Downconverter Performance: IFOUT = 3500 MHz, Lower  
Sideband (High-Side LO).......................................................... 11  
Applications....................................................................................... 1  
Functional Block Diagram .............................................................. 1  
General Description......................................................................... 1  
Revision History ............................................................................... 2  
Specifications..................................................................................... 3  
Absolute Maximum Ratings............................................................ 4  
Solder Profile................................................................................. 4  
Thermal Resistance ...................................................................... 4  
ESD Caution.................................................................................. 4  
Pin Configuration and Function Descriptions............................. 5  
Interface Schematics..................................................................... 5  
Typical Performance Characteristics ............................................. 6  
Downconverter Performance: IF Bandwidth, Upper Sideband  
(Low-Side LO) ............................................................................ 13  
Downconverter Performance: IF Bandwidth, Lower Sideband  
(High-Side LO)........................................................................... 16  
Amplitude/Phase Balance, Downconverter............................ 19  
Isolation and Return Loss ......................................................... 20  
Spurious Output Performance.................................................. 21  
Theory of Operation ...................................................................... 22  
LO Driver Amplifier .................................................................. 22  
Mixer............................................................................................ 22  
LNA .............................................................................................. 22  
Applications Information.............................................................. 23  
Layout .......................................................................................... 23  
Performance at Lower IF Frequencies..................................... 25  
Outline Dimensions....................................................................... 26  
Ordering Guide .......................................................................... 26  
Downconverter Performance: IFOUT = 100 MHz, Upper  
Sideband (Low-Side LO) ............................................................. 6  
Downconverter Performance: IFOUT = 100 MHz, Lower  
Sideband (High-Side LO)............................................................ 8  
Downconverter Performance: IFOUT = 3500 MHz, Upper  
Sideband (Low-Side LO) ............................................................. 9  
REVISION HISTORY  
4/2019—Revision 0: Initial Version  
Rev. 0 | Page 2 of 26  
 
Data Sheet  
HMC908A  
SPECIFICATIONS  
TA = 25°C, LO drive level = 0 dBm, VD1 = VD2 = 3 V, VD3 = 5 V. All measurements performed on the evaluation printed circuit board (PCB).  
Table 1.  
Parameter  
Test Conditions/Comments  
Min  
Typ  
Max  
Unit  
FREQUENCY  
Radio Frequency (RF)  
Intermediate Frequency (IF) Output  
LO Input  
9
12  
GHz  
GHz  
GHz  
dBm  
DC  
8.5  
−4  
3.5  
15.5  
+6  
LO DRIVE LEVEL  
0
RF PERFORMANCE  
Downconverter (IFOUT), IFOUT = 100 MHz  
Conversion Gain  
Image Rejection  
Input Third-Order Intercept (IP3)  
Input Second-Order Intercept (IP2)  
Input 1 dB Compression Point (P1dB)  
Noise Figure  
Downconverter (IFOUT), IFOUT = 3500 MHz  
Upper sideband  
Lower sideband  
8
15  
−3  
11  
25  
0
dB  
dB  
dBm  
31  
−8  
2
dBm  
dB  
3.5  
Conversion Gain  
Image Rejection  
Input IP3  
Input IP2  
Input P1dB  
Noise Figure  
Amplitude Balance  
Phase Balance  
Isolation  
7
18  
−3  
9
dB  
dB  
dBm  
30  
+1  
27  
−9  
3
dBm  
dB  
dB  
Taken without external 90° hybrid  
Taken without external 90° hybrid  
Taken without external 90° hybrid  
1
6
Degrees  
LO to RF  
LO to IF  
RF to IF  
36  
17  
46  
26  
5
dB  
dB  
dB  
Return Loss  
LO  
RF  
IF1  
IF2  
Taken without external 90° hybrid  
12  
18  
12  
10  
dB  
dB  
dB  
dB  
SUPPLIES  
Supply Current of RF LNA (ID1 + ID2  
Supply Current of LO Amplifier (ID3  
)
)
VD1 = VD2 = 3 V  
VD3 = 5 V  
53  
100  
85  
125  
mA  
mA  
Rev. 0 | Page 3 of 26  
 
HMC908A  
Data Sheet  
ABSOLUTE MAXIMUM RATINGS  
SOLDER PROFILE  
Table 2  
The typical Pb-free reflow solder profile shown in Figure 2 is  
based on JEDEC J-STD-20C.  
Parameter  
Rating  
RF Input Power  
5 dBm  
60 SECONDS  
TO  
150 SECONDS  
IFx Input Power (LO = 10 dBm, RF = −10 dBm) 15.5 dBm  
LO Input Power  
20 dBm  
4.0 V  
RAMP UP  
3°C/SECOND MAX  
VD1, VD2  
VD3  
5.5 V  
260°C –5°C/+0°C  
IFx Source or Sink Current  
Maximum Junction Temperature (TJ)  
Lifetime at Maximum TJ  
Continuous Power Dissipation, PDISS  
(TA = 85°C, Derate 9.56 mW/°C Above 85°C)  
5 mA  
175°C  
>1 × 106 hours  
0.65 W  
217°C  
150°C TO 200°C  
RAMP DOWN  
6°C/SECOND  
MAX  
1
Operating Temperature Range  
Storage Temperature Range  
Lead Temperature (Soldering 60 sec)  
Moisture Sensitivity Level (MSL)2  
Electrostatic Discharge (ESD) Sensitivity  
Human Body Model (HBM)  
−40°C to +85°C  
−65°C to +150°C  
260°C  
TIME (Seconds)  
60 SECONDS  
20 SECONDS  
TO 40 SECONDS  
TO 180 SECONDS  
MSL3  
480 SECONDS MAX  
Figure 2. Pb-free Reflow Solder Profile  
250V  
THERMAL RESISTANCE  
Field Induced Charged Device Model  
(FICDM)  
1250V  
Thermal performance is directly linked to PCB design and  
operating environment. Careful attention to PCB thermal  
design is required.  
1 PDISS is a theoretical number calculated by (TJ − 85°C)/θJC  
2 Based on IPC/JEDEC J-STD-20 MSL classifications.  
.
Stresses at or above those listed under Absolute Maximum  
Ratings may cause permanent damage to the product. This is a  
stress rating only; functional operation of the product at these  
or any other conditions above those indicated in the operational  
section of this specification is not implied. Operation beyond  
the maximum operating conditions for extended periods may  
affect product reliability.  
θJA is the natural convection junction to ambient thermal  
resistance measured in a one-cubic foot sealed enclosure. θJC is  
the junction to case thermal resistance.  
Table 3. Thermal Resistance  
Package Type1  
θJA  
θJC  
Unit  
E-32-1  
46  
71  
°C/W  
1 Test Condition 1: JEDEC standard JESD51-2.  
ESD CAUTION  
Rev. 0 | Page 4 of 26  
 
 
 
 
 
Data Sheet  
HMC908A  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS  
32 31 30 29 28 27 26 25  
24  
23  
22  
21  
20  
19  
18  
17  
1
2
3
4
5
6
7
8
NIC  
GND  
RF  
GND  
NIC  
VD3  
NIC  
NIC  
NIC  
NIC  
NIC  
GND  
IF1  
GND  
IF2  
GND  
HMC908A  
TOP VIEW  
(Not to Scale)  
9
10 11 12 13 14 15 16  
NOTES  
1. NIC = NO INTERNAL CONNECTION. THESE PINS  
ARE NOT CONNECTED INTERNALLY.  
2. EXPOSED PAD. THE EXPOSED PAD MUST BE  
CONNECTED TO THE RF AND DC GROUND.  
Figure 3. Pin Configuration  
Table 4. Pin Function Descriptions  
Pin No.  
Mnemonic Description  
1, 5, 7 to 9, 13 to  
16, 22 to 27, 30  
to 32  
NIC  
No Internal Connection. These pins are not connected internally.  
2, 4, 10, 12, 17,  
19, 21  
GND  
Ground Connect. These pins and package bottom must be connected to RF and dc ground.  
3
6
11  
18  
RF  
VD3  
LO  
Radio Frequency Port. This pin is ac-coupled and matched to 50 Ω.  
Power Supply for LO Amplifier.  
Local Oscillator Port. The pin is ac-coupled and matched to 50 Ω.  
Second Quadrature Intermediate Frequency Output Pin. For applications not requiring operation to dc,  
use an off chip dc blocking capacitor. For operation to dc, these pins must not source or sink more than 5 mA  
of current.  
IF2  
20  
IF1  
First Quadrature Intermediate Frequency Output Pin. For applications not requiring operation to dc, use  
an off chip dc blocking capacitor. For operation to dc, these pins must not source or sink more than 5 mA  
of current.  
28, 29  
VD2, VD1  
EPAD  
Power Supply for RF Low Noise Amplifier.  
Exposed Pad. The exposed pad must be connected to the RF and dc ground.  
INTERFACE SCHEMATICS  
GND  
LO  
Figure 4. GND Interface Schematic  
Figure 7. LO Interface Schematic  
IF1, IF2  
RF  
Figure 5. RF Interface Schematic  
Figure 8. IF1, IF2 Interface Schematic  
VD3  
VD1, VD2  
Figure 6. VD3 Interface Schematic  
Figure 9. VD1, VD2 Interface Schematic  
Rev. 0 | Page 5 of 26  
 
 
HMC908A  
Data Sheet  
TYPICAL PERFORMANCE CHARACTERISTICS  
DOWNCONVERTER PERFORMANCE: IFOUT = 100 MHz, UPPER SIDEBAND (LOW-SIDE LO)  
Data taken as an image rejection mixer with external 90° hybrid at the IF ports, LO = 0 dBm, unless otherwise noted.  
18  
16  
14  
12  
10  
8
18  
16  
14  
12  
10  
8
6
6
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
4
4
+85°C  
+25°C  
–40°C  
2
2
0
8.0  
0
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 10. Conversion Gain vs. RF Frequency at Various Temperatures  
Figure 13. Conversion Gain vs. RF Frequency at Various LO Powers, TA = 25°C  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
LO = +6dBm  
LO = +4dBm  
–50  
–50  
LO = +2dBm  
LO = 0dBm  
+85°C  
+25°C  
–40°C  
–55  
–55  
LO = –2dBm  
LO = –4dBm  
–60  
8.0  
–60  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 11. Image Rejection vs. RF Frequency at Various Temperatures  
Figure 14. Image Rejection vs. RF Frequency at Various LO Powers,  
TA = 25°C  
8.0  
8.0  
+85°C  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
7.5  
7.5  
7.0  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
+25°C  
7.0  
–40°C  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 12. Noise Figure vs. RF Frequency at Various Temperatures  
Figure 15. Noise Figure vs. RF Frequency at Various LO Powers, TA = 25°C  
Rev. 0 | Page 6 of 26  
 
 
Data Sheet  
HMC908A  
8
7
8
7
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
6
6
5
5
4
4
3
3
2
2
1
1
0
0
–1  
–2  
–3  
–1  
–2  
–3  
+85°C  
+25°C  
–40°C  
–4  
8.0  
–4  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 16. Input IP3 vs. RF Frequency at Various Temperatures  
Figure 19. Input IP3 vs. RF Frequency at Various LO Powers, TA = 25°C  
50  
50  
45  
40  
35  
30  
25  
+85°C  
+25°C  
–40°C  
45  
40  
35  
30  
25  
20  
15  
10  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
20  
15  
10  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 17. Input IP2 vs. RF Frequency at Various Temperatures  
Figure 20. Input IP2 vs. RF Frequency at Various LO Powers, TA = 25°C  
0
0
+85°C  
+25°C  
–40°C  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
-2  
-2  
-4  
-4  
-6  
-6  
-8  
-8  
-10  
-12  
–14  
-10  
-12  
–14  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 18. Input P1dB vs. RF Frequency at Various Temperatures  
Figure 21. Input P1dB vs. RF Frequency at Various LO Powers, TA = 25°C  
Rev. 0 | Page 7 of 26  
HMC908A  
Data Sheet  
DOWNCONVERTER PERFORMANCE: IFOUT = 100 MHz, LOWER SIDEBAND (HIGH-SIDE LO)  
Data taken as an image rejection mixer with external 90° hybrid at the IF ports, LO = 0 dBm, unless otherwise noted.  
18  
16  
14  
12  
10  
8
8
7
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
6
5
4
3
2
1
0
6
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
–1  
–2  
–3  
4
2
0
8.0  
–4  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 22. Conversion Gain vs. RF Frequency at Various LO Powers,  
TA = 25°C  
Figure 25. Input IP3 vs. RF Frequency at Various LO Powers, TA = 25°C  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
50  
45  
40  
35  
30  
25  
–45  
LO = +6dBm  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
20  
15  
10  
LO = +4dBm  
–50  
LO = +2dBm  
LO = 0dBm  
–55  
LO = –2dBm  
LO = –4dBm  
–60  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 23. Image Rejection vs. RF Frequency at Various LO Powers,  
TA = 25°C  
Figure 26. Input IP2 vs. RF Frequency at Various LO Powers, TA = 25°C  
8.0  
0
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
7.5  
7.0  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
-2  
-4  
-6  
-8  
-10  
-12  
–14  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 24. Noise Figure vs. RF Frequency at Various LO Powers, TA = 25°C  
Figure 27. Input P1dB vs. RF Frequency at Various LO Powers, TA = 25°C  
Rev. 0 | Page 8 of 26  
 
Data Sheet  
HMC908A  
DOWNCONVERTER PERFORMANCE: IFOUT = 3500 MHz, UPPER SIDEBAND (LOW-SIDE LO)  
Data taken as an image rejection mixer with external 90° hybrid at the IF ports, LO = 0 dBm, unless otherwise noted.  
18  
16  
14  
12  
10  
8
18  
16  
14  
12  
10  
8
6
6
LO = +6dBm  
4
4
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
+85°C  
+25°C  
–40°C  
2
2
0
8.0  
0
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 28. Conversion Gain vs. RF Frequency at Various Temperatures  
Figure 31. Conversion Gain vs. RF Frequency at Various LO Powers,  
TA = 25°C  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
LO = +6dBm  
LO = +4dBm  
–50  
–50  
LO = +2dBm  
LO = 0dBm  
+85°C  
–55  
–55  
+25°C  
LO = –2dBm  
–40°C  
LO = –4dBm  
–60  
8.0  
–60  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 29. Image Rejection vs. RF Frequency at Various Temperatures  
Figure 32. Image Rejection vs. RF Frequency at Various LO Powers,  
TA = 25°C  
8
7
8
LO = +6dBm  
7
LO = +4dBm  
LO = +2dBm  
6
6
LO = 0dBm  
LO = –2dBm  
5
5
LO = –4dBm  
4
4
3
3
2
2
1
1
0
0
–1  
–1  
–2  
–3  
–4  
–2  
+85°C  
+25°C  
–40°C  
–3  
–4  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 30. Input IP3 vs. RF Frequency at Various Temperatures  
Figure 33. Input IP3 vs. RF Frequency at Various LO Powers, TA = 25°C  
Rev. 0 | Page 9 of 26  
 
HMC908A  
Data Sheet  
50  
45  
40  
35  
30  
25  
20  
15  
50  
45  
40  
35  
30  
25  
20  
15  
+85°C  
+25°C  
–40°C  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
10  
8.0  
10  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 34. Input IP2 vs. RF Frequency at Various Temperatures  
Figure 37. Input IP2 vs. RF Frequency at Various LO Powers, TA = 25°C  
0
0
–2  
+85°C  
+25°C  
–40°C  
–2  
–4  
–4  
–6  
–6  
–8  
–8  
–10  
–12  
–14  
–16  
–18  
–20  
–10  
–12  
–14  
LO = +4dBm  
–16  
LO = +2dBm  
LO = 0dBm  
–18  
–20  
LO = –2dBm  
LO = –4dBm  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 35. Input P1dB vs. RF Frequency at Various Temperatures  
Figure 38. Input P1dB vs. RF Frequency at Various LO Powers, TA = 25°C  
8.0  
8.0  
+85°C  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
7.5  
7.5  
7.0  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
+25°C  
7.0  
–40°C  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 36. Noise Figure vs. RF Frequency at Various Temperatures  
Figure 39. Noise Figure vs. RF Frequency at Various LO Powers, TA = 25°C  
Rev. 0 | Page 10 of 26  
Data Sheet  
HMC908A  
DOWNCONVERTER PERFORMANCE: IFOUT = 3500 MHz, LOWER SIDEBAND (HIGH-SIDE LO)  
Data taken as an image rejection mixer with external 90° hybrid at the IF ports, LO = 0 dBm, unless otherwise noted.  
18  
16  
14  
12  
10  
8
18  
16  
14  
12  
10  
8
+85°C  
+25°C  
–40°C  
6
6
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
4
4
2
2
0
8.0  
0
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 40. Conversion Gain vs. RF Frequency at Various Temperatures  
Figure 43. Conversion Gain vs. RF Frequency at Various LO Powers,  
TA = 25°C  
–10  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
+85°C  
+25°C  
–40°C  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
–50  
–55  
–60  
–45  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
–50  
–55  
–60  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 41. Image Rejection vs. RF Frequency at Various Temperatures  
Figure 44. Image Rejection vs. RF Frequency at Various LO Powers,  
TA = 25°C  
8
8
+85°C  
LO = +6dBm  
7
7
+25°C  
LO = +4dBm  
–40°C  
LO = +2dBm  
6
6
LO = 0dBm  
LO = –2dBm  
5
4
5
LO = –4dBm  
4
3
3
2
2
1
1
0
0
–1  
–2  
–3  
–4  
–1  
–2  
–3  
–4  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 42. Input IP3 vs. RF Frequency at Various Temperatures  
Figure 45. Input IP3 vs. RF Frequency at Various LO Powers, TA = 25°C  
Rev. 0 | Page 11 of 26  
 
HMC908A  
Data Sheet  
50  
45  
40  
35  
30  
25  
20  
15  
50  
45  
40  
35  
30  
25  
20  
15  
+85°C  
+25°C  
–40°C  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
10  
8.0  
10  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 46. Input IP2 vs. RF Frequency at Various Temperatures  
Figure 49. Input IP2 vs. RF Frequency at Various LO Powers, TA = 25°C  
0
0
–2  
+85°C  
+25°C  
–40°C  
–2  
–4  
–4  
–6  
–6  
–8  
–8  
–10  
–12  
–14  
–16  
–18  
–20  
–10  
–12  
–14  
LO = +4dBm  
–16  
LO = +2dBm  
LO = 0dBm  
–18  
–20  
LO = –2dBm  
LO = –4dBm  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 47. Input P1dB vs. RF Frequency at Various Temperatures  
Figure 50. Input P1dB vs. RF Frequency at Various LO Powers, TA = 25°C  
8.0  
8.0  
+85°C  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
7.5  
7.5  
7.0  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
+25°C  
7.0  
–40°C  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
Figure 48. Noise Figure vs. RF Frequency at Various Temperatures  
Figure 51. Noise Figure vs. RF Frequency at Various LO Powers, TA = 25°C  
Rev. 0 | Page 12 of 26  
Data Sheet  
HMC908A  
DOWNCONVERTER PERFORMANCE: IF BANDWIDTH, UPPER SIDEBAND (LOW-SIDE LO)  
Data taken as an image rejection mixer with external 90° hybrid at the IF ports, LO = 0 dBm at 8.5 GHz, unless otherwise noted.  
18  
16  
14  
12  
10  
8
18  
16  
14  
12  
10  
8
6
6
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
4
4
+85°C  
+25°C  
–40°C  
2
2
0
0.5  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 52. Conversion Gain vs. IF Frequency at Various Temperatures  
Figure 55. Conversion Gain vs. IF Frequency at Various LO Powers,  
TA = 25°C  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
–50  
–55  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
–50  
+85°C  
–55  
+25°C  
–40°C  
–60  
0.5  
–60  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 53. Image Rejection vs. IF Frequency at Various Temperatures  
Figure 56. Image Rejection vs. IF Frequency at Various LO Powers,  
TA = 25°C  
8
7
8
7
6
5
4
3
2
1
0
6
5
4
3
2
1
0
–1  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
–1  
–2  
–3  
–4  
–2  
+85°C  
+25°C  
–40°C  
–3  
–4  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 54. Input IP3 vs. IF Frequency at Various Temperatures  
Figure 57. Input IP3 vs. IF Frequency at Various LO Powers,  
TA = 25°C  
Rev. 0 | Page 13 of 26  
 
HMC908A  
Data Sheet  
50  
45  
40  
35  
30  
25  
20  
15  
50  
45  
40  
35  
30  
25  
20  
15  
+85°C  
+25°C  
–40°C  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
10  
0.5  
10  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 58. Input IP2 vs. IF Frequency at Various Temperatures  
Figure 59. Input IP2 vs. IF Frequency at Various LO Powers,  
A = 25°C  
T
Rev. 0 | Page 14 of 26  
Data Sheet  
HMC908A  
Noise Figure, IF Bandwidth, Upper Sideband at LO = 10 GHz  
8.0  
8.0  
7.5  
7.0  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
+85°C  
LO = +4dBm  
7.5  
+25°C  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
7.0  
–40°C  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 60. Noise Figure vs. IF Frequency at Various Temperatures  
Figure 61. Noise Figure vs. IF Frequency at Various LO Powers,  
A = 25°C  
T
Rev. 0 | Page 15 of 26  
HMC908A  
Data Sheet  
DOWNCONVERTER PERFORMANCE: IF BANDWIDTH, LOWER SIDEBAND (HIGH-SIDE LO)  
Data taken as an image rejection mixer with external 90° hybrid at the IF ports, LO = 0 dBm at 12.5 GHz, unless otherwise noted.  
18  
16  
14  
12  
10  
8
18  
16  
14  
12  
10  
8
+85°C  
+25°C  
–40°C  
6
6
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
4
4
2
2
0
0.5  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 62. Conversion Gain vs. IF Frequency at Various Temperatures  
Figure 65. Conversion Gain vs. IF Frequency at Various LO Powers,  
TA = 25°C  
–10  
–10  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
–50  
–55  
+85°C  
+25°C  
–40°C  
–15  
–20  
–25  
–30  
–35  
–40  
–45  
–50  
–55  
–60  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
–60  
0.5  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 63. Image Rejection vs. IF Frequency at Various Temperatures  
Figure 66. Image Rejection vs. IF Frequency at Various LO Powers,  
TA = 25°C  
8
8
7
6
5
4
3
2
1
0
+85°C  
7
+25°C  
–40°C  
6
5
4
3
2
1
0
–1  
–2  
–3  
–4  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
–1  
–2  
–3  
–4  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 64. Input IP3 vs. IF Frequency at Various Temperatures  
Figure 67. Input IP3 vs. IF Frequency at Various LO Powers,  
TA = 25°C  
Rev. 0 | Page 16 of 26  
 
Data Sheet  
HMC908A  
50  
45  
40  
35  
30  
25  
20  
15  
50  
45  
40  
35  
30  
25  
20  
15  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
+85°C  
+25°C  
–40°C  
10  
0.5  
10  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 68. Input IP2 vs. IF Frequency at Various Temperatures  
Figure 69. Input IP2 vs. IF Frequency at Various LO Powers,  
A = 25°C  
T
Rev. 0 | Page 17 of 26  
HMC908A  
Data Sheet  
Noise Figure, IF Bandwidth, Lower Sideband at LO = 10 GHz  
8.0  
8.0  
7.5  
7.0  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
+85°C  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
7.5  
+25°C  
7.0  
–40°C  
6.5  
6.0  
5.5  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 70. Noise Figure vs. IF Frequency at Various Temperatures  
Figure 71. Noise Figure vs. IF Frequency at Various LO Powers,  
A = 25°C  
T
Rev. 0 | Page 18 of 26  
Data Sheet  
HMC908A  
AMPLITUDE/PHASE BALANCE, DOWNCONVERTER  
Data taken at various LO powers.  
2.5  
2.5  
2.0  
LO = +6dBm  
LO = +6dBm  
2.0  
LO = +4dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
LO = +2dBm  
1.5  
1.0  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
1.5  
1.0  
0.5  
0.5  
0
0
–0.5  
–1.0  
–1.5  
–2.0  
–2.5  
–0.5  
–1.0  
–1.5  
–2.0  
–2.5  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 72. Amplitude Balance vs. IF Frequency at Various LO powers,  
Upper Sideband, TA = 25°C  
Figure 74. Amplitude Balance vs. IF Frequency at Various LO powers,  
Lower Sideband, TA = 25°C  
20  
15  
10  
5
20  
15  
10  
5
0
0
–5  
–5  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
LO = +6dBm  
LO = +4dBm  
LO = +2dBm  
LO = 0dBm  
LO = –2dBm  
LO = –4dBm  
–10  
–15  
–20  
–10  
–15  
–20  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
IF FREQUENCY (GHz)  
IF FREQUENCY (GHz)  
Figure 73. Phase Balance vs. IF Frequency at Various LO Powers,  
Upper Sideband, TA = 25°C  
Figure 75. Phase Balance vs. IF Frequency at Various LO Powers,  
Lower Sideband, TA = 25°C  
Rev. 0 | Page 19 of 26  
 
HMC908A  
Data Sheet  
ISOLATION AND RETURN LOSS  
60  
0
–5  
50  
40  
30  
20  
10  
0
–10  
–15  
–20  
–25  
–30  
–35  
LO TO IF2  
LO TO IF1  
LO TO RF  
IF2  
IF1  
8.0  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
IF FREQUENCY (GHz)  
Figure 76. Isolation vs. RF Frequency at LO = 0 dBm, TA = 25°C  
Figure 78. Return Loss vs. IF Frequency, LO = 17 dBm, TA = 25°C  
20  
0
–5  
RF TO IF2  
RF TO IF1  
15  
10  
5
–10  
–15  
–20  
–25  
RF  
LO  
0
8.0  
–30  
8.5  
9.0  
9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0  
RF FREQUENCY (GHz)  
FREQUENCY (GHz)  
Figure 77. Isolation vs. RF Frequency at LO = 0 dBm, TA = 25°C  
Figure 79. Return Loss vs. Frequency, LO = 0 dBm at 10 GHz, TA = 25°C  
Rev. 0 | Page 20 of 26  
 
Data Sheet  
HMC908A  
Downconverter, M × N, Upper Sideband  
SPURIOUS OUTPUT PERFORMANCE  
RF = 10.6 GHz, LO = 10.5 GHz, RF power = −20 dBm, and LO  
power = 0 dBm, data taken without external hybrid. Mixer  
spurious products are measured in dBc from the IF output  
power level. (M × RF) − (N × LO) values are positive. N/A  
means not applicable.  
LO Harmonics  
When measuring the LO harmonics, the 0 dBm LO input power  
is applied at various LO frequencies.  
All values are in decibels below the LO power level measured at  
the RF port. N/A means not applicable.  
N × LO  
Table 5. LO Harmonics at RF  
0
1
2
3
4
N × LO Spur at RF Port (dBc)  
0
1
2
3
4
N/A  
14  
14  
0
38  
38  
55  
73  
83  
48  
45  
57  
56  
89  
N/A  
71  
84  
69  
95  
LO Frequency (MHz)  
8500  
9000  
9500  
10,000  
10,500  
11,000  
11,500  
12,000  
1
2
3
4
43  
43  
44  
45  
47  
51  
57  
49  
49  
50  
46  
52  
57  
78  
80  
61  
64  
72  
52  
57  
57  
60  
58  
59  
52  
49  
56  
68  
65  
78  
66  
66  
67  
68  
78  
86  
M × RF  
66  
57  
84  
83  
78  
N/A  
Downconverter, M × N, Lower Sideband  
RF = 10.4 GHz, LO = 10.5 GHz, RF power = −20 dBm, and LO  
power = 0 dBm, data taken without external hybrid. Mixer  
spurious products are measured in dBc from the IF output  
power level. (M × RF) − (N × LO) values are positive. N/A  
means not applicable.  
12,500  
N × LO  
0
1
2
3
4
0
1
2
3
4
N/A  
12  
15  
0
39  
41  
53  
72  
82  
45  
47  
57  
51  
89  
N/A  
70  
85  
69  
89  
M × RF  
69  
55  
83  
82  
75  
N/A  
Rev. 0 | Page 21 of 26  
 
HMC908A  
Data Sheet  
THEORY OF OPERATION  
The HMC908A is a compact, GaAs, MMIC, I/Q downconverter  
in a RoHS compliant package optimized for point to point and  
point to multipoint microwave radio applications operating in  
the 9 GHz to 12 GHz input RF frequency range. The HMC908A  
supports LO input frequencies of 8.5 GHz to 15.5 GHz and IF  
output frequencies of dc to 3.5 GHz.  
MIXER  
The mixer is an I/Q double balanced mixer, and this mixer  
topology reduces the need for filtering the unwanted sideband.  
An external 90° hybrid is required to select the desired sideband  
of operation.  
LNA  
The HMC908A uses an RF LNA amplifier followed by an I/Q  
double balanced mixer, where a driver amplifier drives the LO  
(see Figure 1).  
The LNA (RF amplifier) is self biased. The bias current for the  
LNA is 53 mA at 3 V, typically.  
The typical application circuit (see Figure 81) shows the  
necessary external components on the bias lines to eliminate  
any undesired stability problems for the RF amplifier and the  
LO amplifier.  
LO DRIVER AMPLIFIER  
The LO driver amplifier takes a single LO input and amplifies it  
to the desired LO signal level for the mixer to operate optimally.  
The LO driver amplifier is self biased, and it only requires a  
single dc bias voltage (VD3) to operate. The bias current for the  
LO amplifier is 100 mA at 5 V, typically. The LO drive level of  
−4 dBm to +6 dBm makes it compatible with the Analog Devices,  
Inc., wideband synthesizer portfolio without the need for an  
external LO driver amplifier.  
The HMC908A is a much smaller alternative to hybrid style  
image rejection converter assemblies, and it eliminates the need  
for wire bonding by allowing the use of surface-mount  
manufacturing assemblies.  
The HMC908A downconverter comes in a compact, 4.9 mm ×  
4.9 mm, 32-terminal ceramic LCC. The HMC908A operates  
over the −40°C to +85°C temperature range.  
Rev. 0 | Page 22 of 26  
 
 
 
 
Data Sheet  
HMC908A  
APPLICATIONS INFORMATION  
Figure 81 shows the typical application circuit for the  
HMC908A. To select the appropriate sideband, an external 90°  
hybrid coupler is needed. For applications not requiring operation  
to dc, using an off chip, dc blocking capacitor is recommended.  
For applications that require the LO signal at the output to be  
suppressed, use a bias tee or RF feed. Ensure that the source or  
sink current used for LO suppression is <5 mA for each IF port  
to prevent damage to the device. The common-mode voltage  
for each IF port is 0 V.  
LAYOUT  
Solder the exposed pad on the underside of the HMC908A to a  
low thermal and electrical impedance ground plane. This pad is  
typically soldered to an exposed opening in the solder mask on the  
evaluation board. Connect these ground vias to all other ground  
layers on the evaluation board to maximize heat dissipation from  
the device package. Figure 80 shows the PCB land pattern  
footprint for the EV1HMC908ALC5 evaluation board.  
To select the upper sideband (low-side LO), connect the IF1 pin  
to the 0° port of the hybrid and connect the IF2 pin to the 90°  
port of the hybrid. To select the lower sideband (high-side LO),  
connect the IF1 pin to the 90° port of the hybrid and connect  
the IF2 pin to the 0° port of the hybrid. The output is from the  
sum port of the hybrid, and the difference port is 50 Ω  
terminated.  
The EV1HMC908ALC5 evaluation PCB used in the application  
must use RF circuit design techniques. Signal lines must have 50 Ω  
impedance, and connect the package ground leads and exposed  
pad directly to the ground plane, similar to Figure 82. Use a  
sufficient number of via holes to connect the top and bottom  
ground planes. The evaluation circuit board shown in Figure 82 is  
available from Analog Devices upon request.  
Figure 80. PCB Land Pattern Footprint of the EV1HMC908ALC5  
VD3  
VD1  
VD2  
2.2µF  
2.2µF  
2.2µF  
+
+
+
1nF  
1nF  
1nF  
100pF  
100pF  
100pF  
32 31 30 29 28 27 26 25  
NIC  
NIC  
NIC  
NIC  
GND  
IF1  
1
2
3
4
5
6
7
8
24  
23  
22  
21  
20  
GND  
RF  
RF  
HYBRID  
COUPLER  
GND  
NIC  
VD3  
NIC  
NIC  
IF1  
IF2  
HMC908A  
GND 19  
IF2 18  
GND 17  
9
10 11 12 13 14 15 16  
LO  
IF  
OUTPUT  
Figure 81. Typical Application Circuit Evaluation Board Information  
Rev. 0 | Page 23 of 23  
 
 
 
 
HMC908A  
Data Sheet  
Figure 82. EV1HMC908ALC5 Evaluation PCB Top Layer  
Table 6. Bill of Materials for the EV1HMC908ALC5 Evaluation PCB  
Reference  
Designator  
08-0505361  
J1, J2  
Description  
Evaluation board,2 EV1HMC908ALC5.  
PCB mount Subminiature Version A (SMA) RF connectors, SRI connector gage. J1 connects to RF, and J2 connects to LO.  
PCB mount SMA connectors, Johnson SMA connectors. J3 connects to IF1, and J4 connects to IF2.  
DC Mill-Max pins. J5 connects to VD1, J6 connects to VD2, and J7 connects to VD3.  
100 pF capacitor, 0402 package.  
1000 pF capacitor, 0402 package.  
2.2 μF capacitor, Tantalum Case A.  
J3, J4  
J5, J6, J7  
C1, C2, C3  
C4, C5, C6  
C7, C8, C9  
R1, R2  
0 Ω resistor, 0402 package.  
U1  
Device under test, HMC908A.  
1 08-050536 is the raw bare PCB identifier. Reference EV1HMC908ALC5 when ordering the complete evaluation PCB.  
2 Circuit board RF material: 10 mils Rogers 4350.  
Rev. 0 | Page 24 of 24  
 
Data Sheet  
HMC908A  
30  
25  
20  
15  
10  
5
IMAGE REJECTION (dBc)  
CONVERSION GAIN (dB)  
PERFORMANCE AT LOWER IF FREQUENCIES  
The HMC908A can operate at low IF frequencies approaching  
dc. Figure 83 shows the conversion gain and image rejection  
performance at lower IF frequencies.  
0
1
10  
100  
1k  
10k  
100k  
1M  
10M  
100M  
IF FREQUENCY (Hz)  
Figure 83. Conversion Gain and Image Rejection vs. IF Frequency at Low IF  
Frequencies, LO = 10.5 GHz at 0 dBm  
Rev. 0 | Page 25 of 26  
 
 
HMC908A  
Data Sheet  
OUTLINE DIMENSIONS  
5.05  
4.90 SQ  
4.75  
0.36  
0.30  
0.24  
PIN 1  
0.08  
REF  
INDICATOR  
PIN 1  
32  
25  
24  
1
0.50  
BSC  
3.60  
3.50 SQ  
3.40  
EXPOSED  
PAD  
17  
8
16  
9
0.38  
0.32  
0.26  
0.20 MIN  
BOTTOM VIEW  
3.50 REF  
TOP VIEW  
SIDE VIEW  
1.10  
1.00  
0.90  
4.10 REF  
FOR PROPER CONNECTION OF  
THE EXPOSED PAD, REFER TO  
THE PIN CONFIGURATION AND  
FUNCTION DESCRIPTIONS  
SEATING  
PLANE  
SECTION OF THIS DATA SHEET.  
Figure 84. 32-Terminal Ceramic Leadless Chip Carrier (LCC)  
(E-32-1)  
Dimensions shown in millimeters  
ORDERING GUIDE  
Model1  
HMC908ALC5  
HMC908ALC5TR  
HMC908ALC5TR-R5  
EV1HMC908ALC5  
Temperature Range  
−40°C to +85°C  
−40°C to +85°C  
−40°C to +85°C  
Package Body Material  
Alumina Ceramic  
Alumina Ceramic  
Lead Finish  
Gold  
Gold  
Package Description  
32-Terminal Ceramic LCC  
32-Terminal Ceramic LCC  
32-Terminal Ceramic LCC  
Evaluation Board  
Package Option  
E-32-1  
E-32-1  
Alumina Ceramic  
Gold  
E-32-1  
1 All models are RoHS compliant parts.  
©2019 Analog Devices, Inc. All rights reserved. Trademarks and  
registered trademarks are the property of their respective owners.  
D20070-0-4/19(0)  
Rev. 0 | Page 26 of 26  
 
 

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