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Active RF Splitter ADA4302-4
FEATURES
Single 5 V supply 54 MHz to 865 MHz CATV operating range 4.6 dB of gain per output channel 4.4 dB noise figure 25 dB isolation between output channels -16 dB input return loss CSO of -73 dBc (135 channels, 15 dBmV per tone) CTB of -66 dBc (135 channels, 15 dBmV per tone) 1.3 GHz, -3 dB bandwidth
FUNCTIONAL BLOCK DIAGRAM
VCC
+
VON4
GND
VOP4 VCC VON3
ILN VIP
VOP3
APPLICATIONS
Cable set-top boxes Home gateways CATV distribution systems Cable splitter modules
J1
GND VIN ILP
SPLITTER
VON2
VOP2
The ADA4302-4 is used as an active element in applications where a lossless signal split is required. Typical applications include multituner cable set-top boxes, cable splitter modules, multituner televisions, and home gateways where traditional solutions have consisted of discrete passive splitters followed by separate fixed gain amplifiers. The ADA4302-4 is a low cost alternative solution that simplifies designs and improves system performance by integrating a signal splitter element and gain element into a single IC solution.
CSO (dBc)
VOP1
Figure 1.
-55
-60
-65 TA = +85C -70 TA = +25C -75 TA = -40C
-85 50
100 FREQUENCY (MHz)
1000
Figure 2. Composite Second-Order (CSO) vs. Frequency
Rev. B
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 www.analog.com Fax: 781.461.3113 (c) 2005 Analog Devices, Inc. All rights reserved.
05017-008
The ADA4302-4 features four differential outputs. The differential architecture allows systems designed with the ADA4302-4 to maintain excellent linearity throughout the CATV band. The ADA4302-4 can also be configured for applications that require fewer than four outputs. Outputs can be configured independently from one another.
-80
05017-016
GENERAL DESCRIPTION
VCC
GND
VON1
ADA4302-4 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ..............................................6 Applications........................................................................................8 Circuit Description .......................................................................8 Evaluation Boards .........................................................................8 RF Layout Considerations............................................................8 Power Supply..................................................................................8 Outline Dimensions ....................................................................... 11 Ordering Guide .......................................................................... 11
REVISION HISTORY
9/05--Rev. SpA to Rev. B Updated Format..................................................................Universal Changes to Circuit Description Section ........................................ 8 5/05--Rev. Sp0 to Rev. SpA Changes to Format .............................................................Universal Changes to Features.......................................................................... 1 Changes to Figure 1 and Figure 2................................................... 1 Changes to Table 1............................................................................ 3 Changes to Figure 4 and Figure 5................................................... 6 Changes to Applications Section .................................................... 8 10/04--Revision Sp0: Initial Version
Rev. B | Page 2 of 12
ADA4302-4 SPECIFICATIONS
VCC = 5 V, RIN = RL = 75 , TA = 25C, unless otherwise noted. The ADA4302-4 is characterized using a balun 1 at the input. Table 1.
Parameter DYNAMIC PERFORMANCE Bandwidth (-3 dB) Specified Frequency Range Gain (S21) Gain Flatness NOISE/DISTORTION PERFORMANCE Composite Triple Beat (CTB) Composite Second-Order (CSO) Cross Modulation (CXM) Output IP3 Output IP2 Noise Figure Conditions Min Typ 1300 f = 100 MHz f = 865 MHz 135 Channels, 15 dBmV/Channel, f = 103.25 MHz 135 Channels, 15 dBmV/Channel, f = 103.25 MHz 135 Channels, 15 dBmV/Channel, 100% modulation @ 15.75 kHz, f = 103.25 MHz f1 = 97.25 MHz, f2 = 103.25 MHz f1 = 97.25 MHz, f2 = 103.25 MHz @ 54 MHz @ 550 MHz @ 865 MHz Referenced to 75 @ 54 MHz @ 550 MHz @ 865 MHz Any output, 54 MHz to 865 MHz Referenced to 75 @ 54 MHz @ 550 MHz @ 865 MHz Between any two outputs, 54 MHz to 865 MHz Output referred, f = 100 MHz 54 3.5 4.6 1 -66 -73 -67 23 65 4.1 4.4 5.0 865 5.7 Max Unit MHz MHz dB dB dBc dBc dBc dBm dBm dB dB dB
-62 -67 -64
4.4 4.7 5.8
INPUT CHARACTERISTICS Input Return Loss (S11)
Output-to-Input Isolation (S12) OUTPUT CHARACTERISTICS Output Return Loss (S22)
-16 -16 -18 -35
-14 -11 -11 -33
dB dB dB dB
Output-to-Output Isolation 1 dB Compression POWER SUPPLY Nominal Supply Voltage Quiescent Supply Current
1
-11 -12.5 -14 -25 8 5 215
-9 -10 -11.5
dB dB dB dB dBm V mA
240
M/A-COM MABAES0029.
Rev. B | Page 3 of 12
ADA4302-4 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Supply Voltage Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering 10 sec) Junction Temperature Rating 5.5 V -65C to +125C -40C to +85C 300C 150C
Stresses above those listed under Absolute Maximum Rating may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. B | Page 4 of 12
ADA4302-4 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VON1 VOP1 GND VON2 VOP2
VOP4 VON4 VCC VCC ILN
1 2 3 4 5
20 19 18 17 16
PIN 1 INDICATOR
ADA4302-4
TOP VIEW (Not to Scale)
15 VON3 14 VOP3 13 VCC 12 VCC 11 ILP
6 7 8 9 10
Figure 3. 20-Lead LFCSP_VQ Pin Configuration
Table 3. Pin Function Descriptions
Pin No. 1 2 3, 4, 12, 13 5 6, 10, 18 7 8 9 11 14 15 16 17 19 20 Mnemonic VOP4 VON4 VCC ILN GND VIP GNDC VIN ILP VOP3 VON3 VOP2 VON2 VOP1 VON1 Description Positive Output 4 Negative Output 4 Supply Pin Bias Pin Ground Positive Input Ground Negative Input Bias Pin Positive Output 3 Negative Output 3 Positive Output 2 Negative Output 2 Positive Output 1 Negative Output 1
Rev. B | Page 5 of 12
GND VIP GNDC VIN GND
05017-001
ADA4302-4 TYPICAL PERFORMANCE CHARACTERISTICS
-55
7
-60
6 TA = +85C
-65
NOISE FIGURE (dB)
CSO (dBc)
5
TA = +85C -70 TA = +25C -75 TA = -40C
TA = +25C
4 TA = -40C 3
-80
05017-008
-85 50
100 FREQUENCY (MHz)
1000
2 50
100 FREQUENCY (MHz)
1000
Figure 4. Composite Second-Order (CSO) vs. Frequency
Figure 7. Noise Figure vs. Frequency
-55
90
80
-60
OUTPUT IP2 (dBm)
70
CTB (dBc)
TA = +25C -65
60
TA = -40C -70 TA = +85C
50
40
05017-009
05017-012
-75 50
100 FREQUENCY (MHz)
1000
30 50
100 FREQUENCY (MHz)
1000
Figure 5. Composite Triple Beat (CTB) vs. Frequency
Figure 8. Output IP2 vs. Frequency
-55
25
20 -60
OUTPUT IP3 (dBm)
CXM (dBc)
TA = -40C -65
15
10
-70
TA = +85C
TA = +25C
5
05017-010 05017-013
-75 50
100 FREQUENCY (MHz)
1000
0 50
100 FREQUENCY (MHz)
1000
Figure 6. Cross Modulation (CXM) vs. Frequency
Figure 9. Output IP3 vs. Frequency
Rev. B | Page 6 of 12
05017-006
ADA4302-4
10 TA = -40C 5 TA = +25C -5 0
0
INPUT RETURN LOSS (dB)
05017-003
GAIN (dB)
-10
-5
TA = +85C
-15
-10
-15
-20
05017-002
-20 50
100
1000 FREQUENCY (MHz)
10000
-25 50
100 FREQUENCY (MHz)
1000
Figure 10. AC Response (S21)
Figure 13. Input Return Loss vs. Frequency (S11)
0
0
OUTPUT RETURN LOSS (dB)
05017-005
-10
-5
ISOLATION (dB)
-20
-10
-30
-15
-40
-20
05017-004
-50 50
100 FREQUENCY (MHz)
1000
-25 50
100 FREQUENCY (MHz)
1000
Figure 11. Output-to-Input Isolation vs. Frequency (S12)
Figure 14. Output Return Loss vs. Frequency (S22)
0
240 235 230 225 220 215 210
05017-011
-5
-10
-15
-20
-25
05017-007
-30 -35 50
QUIESCENT SUPPLY CURRENT (mA)
ISOLATION (dB)
205 200 -60
100 FREQUENCY (MHz)
1000
-40
-20
0 20 40 TEMPERATURE (C)
60
80
100
Figure 12. Output-to-Output Isolation vs. Frequency
Figure 15. Quiescent Supply Current vs. Temperature
Rev. B | Page 7 of 12
ADA4302-4 APPLICATIONS
The ADA4302-4 active splitter is primarily intended for use in the downstream path of television set-top boxes (STBs) that contain multiple tuners. It is located directly after the diplexer in a CATV customer premise unit. The ADA4302-4 provides a differential input and four differential outputs that allow the delivery of the RF signal to up to four different signal paths. These paths can include, but are not limited to, a main picture tuner, the picture-in-picture (PIP) tuner, a digital video recorder (DVR), and a cable modem (CM). The differential nature of the ADA4302-4 allows it to provide composite second-order (CSO) and composite triple beat (CTB) products that are -73 dBc and -66 dBc, respectively. The use of the SiGe process also allows the ADA4302-4 to achieve a noise figure (NF) that is less than 5 dB.
EVALUATION BOARDS
There are two evaluation boards for the ADA4302-4, a singleended output board (ADA4302-4 EBSE) and a differential output board (ADA4302-4 EBDI). The single-ended output board has an input balun that converts a signal from a singleended source to a differential signal. The differential output board uses the same input balun and allows the output signals to run directly to the board connectors. This allows the differential signals at the ADA4302-4's outputs to be applied directly to a tuner with differential inputs. The schematics for these evaluation boards can be seen in Figure 16 and Figure 17, respectively. Each board has place holders to properly terminate the unused outputs, if needed. On the single-ended output board, they are designated R15 through R18, and 75 resistors should be used here (see Figure 16). On the differential output board, 37.5 resistors should be used for R1, R2, and R4 through R9 when their respective outputs are not in use (see Figure 17).
CIRCUIT DESCRIPTION
The ADA4302-4 has a low noise buffer amplifier that is followed by four parallel amplifiers. This arrangement provides 4.6 dB of gain relative to the RF signal present at the differential inputs of the active splitter. The input and each output must be properly matched to a differential 75 environment in order for distortion and noise performance to match the data sheet specifications. If needed, baluns to convert to single-ended operation can be used. The M/A-COM MABAES0029 is recommended for the input balun and the Mini-Circuit(R) TC1-1-13M-2 is recommended for the output balun. AC coupling capacitors of 0.01 F are recommended for all inputs and outputs. Two 1 H RF chokes, L1 and L2 (Coilcraft chip inductor 0805LS-102X), are used to correctly bias internal nodes of the ADA4302-4 by connecting them between the 5 V supply and ILN and ILP, respectively.
RF LAYOUT CONSIDERATIONS
Appropriate impedance matching techniques are mandatory when designing a circuit board for the ADA4302-4. Improper characteristic impedances on traces can cause reflections that can lead to poor linearity. If the stage following the ADA4302-4 is a single-ended load with a 75 impedance, then a balun should be used. The characteristic impedance of the signal trace from each output of a differential pair to the output balun should be 37.5 . In the case of the differential output evaluation board, the output traces should also have a characteristic impedance of 37.5 .
POWER SUPPLY
The 5 V supply should be applied to each of the VCC pins and RF chokes via a low impedance power bus. The power bus should be decoupled to ground using a 10 F tantalum capacitor and a 0.01 F ceramic chip capacitor located close to the ADA4302-4. In addition, the VCC pins should be decoupled to ground with a 0.01 F ceramic chip capacitor located as close to each of the pins as possible. Pin 3 and Pin 4 can share one capacitor, and Pin 12 and Pin 13 can share one capacitor.
Rev. B | Page 8 of 12
ADA4302-4
75 TRACE P4 R15 DNI 3 1 T4 4 5 C3 0.01F 75 TRACE R2 DNI AGND
G1
G2
G3
G4
VCC VCC +
37.5 TRACES
AGND
C13 10F
C1 0.01F
C11 0.01F
C2 0.01F AGND
AGND
75 TRACE C10 0.01F AGND VON4 VON3 VOP4 13 VCC 12 VCC VCC 4 3 VCC VOP3 37.5 TRACES R16 DNI 3 1 P3 T3 4 5 C5 0.01F 75 TRACE R6 DNI AGND
VCC
L1 1H
C4 0.01F AGND
AGND 5 J1 75 TRACE R3 DNI AGND C19 0.01F 75 TRACE 4
T5
1 37.5 TRACES 3 VIN 9 ILP 11
DUT SPLITTER 20 16 17
GND 6 GND 10 GND 18 8 GNDC 19 VOP1
14
VIP 7
15
C14 0.01F
1
ILN 5
2
VON1
VON2
VOP2
75 TRACE P2 R17 DNI 3 1 T2 4 5 C9 0.01F 75 TRACE R8 DNI AGND
L2 1H
37.5 TRACES VCC AGND
C8 0.01F AGND 75 TRACE P1 R18 DNI 3 1 T1 4 5 C6 0.01F 75 TRACE R10 DNI AGND
37.5 TRACES
AGND
Figure 16. Single-Ended Output Evaluation Board
Table 4. ADA4302-4ACPZ-EBSE Bill of Materials (BOM)
Quantity 2 4 1 13 1 1 5 9 Description Coilcraft 0805LS-102X Chip Inductor Mini-Circuit TC1-1-13M-2 Transformer M/A-COM MABAES0029 Transformer MLCC, 0.01 F, C402 Tantalum, 10 F, B Size ADA4302-4ACPZ SMA Connectors Impedance Matching Resistors, Insert as Needed Reference L1, L2 T1 to T4 T5 C1 to C11, C14, C19 C13 DUT J1, P1 to P4 R2, R3, R6, R8, R10, R15 to R18
Rev. B | Page 9 of 12
05017-015
C7 0.01F
ADA4302-4
P4VDN C3 0.01F G1 G2 G3 G4 VCC VCC + AGND C13 10F C1 0.01F C11 0.01F C2 0.01F 37.5 TRACES AGND R9 DNI P4VDP R8 DNI 37.5 TRACES
AGND
C10 0.01F AGND
VON4 VON3 VOP4 VOP3 13 VCC 12 VCC VCC 4 3 VCC
P3VDN C5 0.01F 37.5 TRACES AGND C4 0.01F
2
R1 DNI 37.5 TRACES R2 DNI P3VDP
VCC
L1 1H
AGND 5 J1 75 TRACE C19 0.01F 75 TRACE 4
T5
1 37.5 TRACES 3 VIN 9 ILP 11
DUT SPLITTER
20 VON1 16 17 VON2 VOP2
GND 6 GND 10 GND 18 8 GNDC 19 VOP1
14
VIP 7
15
C14 0.01F
1
ILN 5
L2 1H
P2VDN C9 0.01F 37.5 TRACES R4 DNI 37.5 TRACES AGND C8 0.01F R5 DNI P2VDP
VCC AGND
P1VDN C6 0.01F 37.5 TRACES AGND C7 0.01F R6 DNI
05017-014
R7 DNI 37.5 TRACES
P1VDP
Figure 17. Differential Output Evaluation Board
Table 5. ADA4302-4ACPZ-EBDI Bill of Materials (BOM)
Quantity 2 1 13 1 1 9 8 Description Coilcraft 0805LS-102X Chip Inductor M/A-COM MABAES0029 Transformer MLCC, 0.01 F, C402 Tantalum, 10 F, B size ADA4302-4ACPZ SMA Connectors Impedance Matching Resistors, Insert as Needed Reference L1, L2 T5 C1 to C11, C14, C19 C13 DUT J1, P1VDN to P4VDN, P1VDP to P4VDP R1, R2, R4 to R9
Rev. B | Page 10 of 12
ADA4302-4 OUTLINE DIMENSIONS
4.00 BSC SQ 0.60 MAX PIN 1 INDICATOR TOP VIEW 3.75 BCS SQ 0.75 0.55 0.35 12 MAX 1.00 0.85 0.80 SEATING 0.50 PLANE BSC 0.80 MAX 0.65 TYP 0.05 MAX 0.02 NOM 0.20 REF COPLANARITY 0.08
11 10 6 5
0.60 MAX
PIN 1 INDICATOR
20 1
16 15
2.25 2.10 SQ 1.95 0.25 MIN 0.30 0.23 0.18
COMPLIANT TO JEDEC STANDARDS MO-220-VGGD-1
Figure 18. 20-Lead Lead Frame Chip Scale Package [LFCSP_VQ] 4 mm x 4 mm Body, Very Thin Quad (CP-20-1) Dimensions shown in millimeters
ORDERING GUIDE
Model ADA4302-4ACP-REEL ADA4302-4ACP-RL7 ADA4302-4ACPZ-RL 1 ADA4302-4ACPZ-RL71 ADA4302-4ACPZ-R21 ADA4302-4ACPZ-EBSE 2 ADA4302-4ACPZ-EBDI2
1 2
Ordering Quantity 5,000 1,500 5,000 1,500 250 1 1
Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
Package Description 20-Lead LFCSP_VQ 20-Lead LFCSP_VQ 20-Lead LFCSP_VQ 20-Lead LFCSP_VQ 20-Lead LFCSP_VQ Single-Ended Evaluation Board Differential Output Evaluation Board
Package Option CP-20-1 CP-20-1 CP-20-1 CP-20-1 CP-20-1
Z = Pb-free part. Evaluation board contains Pb-free part.
Rev. B | Page 11 of 12
ADA4302-4 NOTES
(c) 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05017-0-9/05(B)
T T
Rev. B | Page 12 of 12

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