ANALOG DEVICES ADA4302-4

Active RF Splitter ADA4302-4 FEATURES FUNCTIONAL BLOCK DIAGRAM VCC Single 5 V supply 54 MHz to 865 MHz CATV operating range 4.6 dB of gain per output channel + VON4 4.4 dB noise figure 25 dB isolation between output channels VOP4 GND VCC −16 dB input return loss CSO of −73 dBc (135 channels, 15 dBmV per tone) VON3 CTB of −66 dBc (135 channels, 15 dBmV per tone) 1.3 GHz, −3 dB bandwidth ILN VOP3 VIP APPLICATIONS SPLITTER GND VIN Cable set-top boxes J1 ILP Home gateways VON2 CATV distribution systems VOP2 Cable splitter modules VON1 VCC GND GENERAL DESCRIPTION VOP1 The ADA4302-4 is used as an active element in applications where a lossless signal split is required. Typical applications Figure 1. include multituner cable set-top boxes, cable splitter modules, multituner televisions, and home gateways where traditional –55 solutions have consisted of discrete passive splitters followed by separate fixed gain amplifiers. The ADA4302-4 is a low cost –60 alternative solution that simplifies designs and improves system performance by integrating a signal splitter element and gain –65 element into a single IC solution. T = +85°C A The ADA4302-4 features four differential outputs. The –70 differential architecture allows systems designed with the T = +25°C A ADA4302-4 to maintain excellent linearity throughout the –75 CATV band. The ADA4302-4 can also be configured for T = –40°C A applications that require fewer than four outputs. Outputs –80 can be configured independently from one another. –85 50 100 1000 FREQUENCY (MHz) 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. CSO (dBc) 05017-008 05017-016 ADA4302-4 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................6 Applications....................................................................................... 1 Applications........................................................................................8 General Description ......................................................................... 1 Circuit Description .......................................................................8 Functional Block Diagram .............................................................. 1 Evaluation Boards .........................................................................8 Revision History ............................................................................... 2 RF Layout Considerations............................................................8 Specifications..................................................................................... 3 Power Supply..................................................................................8 Absolute Maximum Ratings............................................................ 4 Outline Dimensions ....................................................................... 11 ESD Caution.................................................................................. 4 Ordering Guide .......................................................................... 11 Pin Configuration and Function Descriptions............................. 5 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 1 VCC = 5 V, RIN = RL = 75 Ω, TA = 25°C, unless otherwise noted. The ADA4302-4 is characterized using a balun at the input. Table 1. Parameter Conditions Min Typ Max Unit DYNAMIC PERFORMANCE Bandwidth (−3 dB) 1300 MHz Specified Frequency Range 54 865 MHz Gain (S21) f = 100 MHz 3.5 4.6 5.7 dB Gain Flatness f = 865 MHz 1 dB NOISE/DISTORTION PERFORMANCE Composite Triple Beat (CTB) 135 Channels, 15 dBmV/Channel, f = 103.25 MHz −66 −62 dBc Composite Second-Order (CSO) 135 Channels, 15 dBmV/Channel, f = 103.25 MHz −73 −67 dBc Cross Modulation (CXM) 135 Channels, 15 dBmV/Channel, 100% modulation −67 −64 dBc @ 15.75 kHz, f = 103.25 MHz Output IP3 f1 = 97.25 MHz, f2 = 103.25 MHz 23 dBm Output IP2 f1 = 97.25 MHz, f2 = 103.25 MHz 65 dBm Noise Figure @ 54 MHz 4.1 4.4 dB @ 550 MHz 4.4 4.7 dB @ 865 MHz 5.0 5.8 dB INPUT CHARACTERISTICS Input Return Loss (S11) Referenced to 75 Ω @ 54 MHz −16 −14 dB @ 550 MHz −16 −11 dB @ 865 MHz −18 −11 dB Output-to-Input Isolation (S12) Any output, 54 MHz to 865 MHz −35 −33 dB OUTPUT CHARACTERISTICS Output Return Loss (S22) Referenced to 75 Ω @ 54 MHz −11 −9 dB @ 550 MHz −12.5 −10 dB @ 865 MHz −14 −11.5 dB Output-to-Output Isolation Between any two outputs, 54 MHz to 865 MHz −25 dB 1 dB Compression Output referred, f = 100 MHz 8 dBm POWER SUPPLY Nominal Supply Voltage 5 V Quiescent Supply Current 215 240 mA 1 M/A-COM MABAES0029. Rev. B | Page 3 of 12 ADA4302-4 ABSOLUTE MAXIMUM RATINGS Table 2. Stresses above those listed under Absolute Maximum Rating Parameter Rating may cause permanent damage to the device. This is a stress Supply Voltage 5.5 V rating only; functional operation of the device at these or any Storage Temperature Range −65°C to +125°C other conditions above those indicated in the operational Operating Temperature Range −40°C to +85°C section of this specification is not implied. Exposure to absolute Lead Temperature (Soldering 10 sec) 300°C maximum rating conditions for extended periods may affect Junction Temperature 150°C 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 PIN 1 INDICATOR VOP4 1 15 VON3 VON4 14 VOP3 2 ADA4302-4 VCC 3 13 VCC TOP VIEW VCC 4 12 VCC (Not to Scale) ILN 5 11 ILP Figure 3. 20-Lead LFCSP_VQ Pin Configuration Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 VOP4 Positive Output 4 2 VON4 Negative Output 4 3, 4, 12, 13 VCC Supply Pin 5 ILN Bias Pin 6, 10, 18 GND Ground 7 VIP Positive Input 8 GNDC Ground 9 VIN Negative Input 11 ILP Bias Pin 14 VOP3 Positive Output 3 15 VON3 Negative Output 3 16 VOP2 Positive Output 2 17 VON2 Negative Output 2 19 VOP1 Positive Output 1 20 VON1 Negative Output 1 Rev. B | Page 5 of 12 05017-001 GND 6 20 VON1 19 VOP1 VIP 7 GNDC 8 18 GND VIN 9 17 VON2 GND 10 16 VOP2 ADA4302-4 TYPICAL PERFORMANCE CHARACTERISTICS –55 7 –60 6 T = +85°C A –65 5 T = +25°C T = +85°C A A –70 T = +25°C A 4 –75 T = –40°C A T = –40°C A 3 –80 –85 2 50 100 1000 50 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) Figure 4. Composite Second-Order (CSO) vs. Frequency Figure 7. Noise Figure vs. Frequency –55 90 80 –60 70 T = +25°C A –65 60 T = –40°C A 50 T = +85°C –70 A 40 –75 30 50 100 1000 50 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) Figure 8. Output IP2 vs. Frequency Figure 5. Composite Triple Beat (CTB) vs. Frequency –55 25 20 –60 15 T = –40°C A –65 10 T = +25°C A T = +85°C A –70 5 –75 0 50 100 1000 50 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) Figure 9. Output IP3 vs. Frequency Figure 6. Cross Modulation (CXM) vs. Frequency Rev. B | Page 6 of 12 CXM (dBc) CTB (dBc) CSO (dBc) 05017-010 05017-009 05017-008 OUTPUT IP3 (dBm) OUTPUT IP2 (dBm) NOISE FIGURE (dB) 05017-013 05017-012 05017-006 ADA4302-4 10 0 T = –40°C A 5 T = +25°C –5 A 0 –10 T = +85°C A –5 –15 –10 –20 –15 –20 –25 50 100 1000 10000 50 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) Figure 10. AC Response (S21) Figure 13. Input Return Loss vs. Frequency (S11) 0 0 –10 –5 –10 –20 –30 –15 –40 –20 –50 –25 50 100 1000 50 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) Figure 11. Output-to-Input Isolation vs. Frequency (S12) Figure 14. Output Return Loss vs. Frequency (S22) 0 240 235 –5 230 –10 225 –15 220 –20 215 –25 210 –30 205 –35 200 50 100 1000 –60 –40 –20 0 20 40 60 80 100 FREQUENCY (MHz) TEMPERATURE (°C) Figure 12. Output-to-Output Isolation vs. Frequency Figure 15. Quiescent Supply Current vs. Temperature Rev. B | Page 7 of 12 ISOLATION (dB) ISOLATION (dB) GAIN (dB) 05017-007 05017-005 05017-003 QUIESCENT SUPPLY CURRENT (mA) OUTPUT RETURN LOSS (dB) INPUT RETURN LOSS (dB) 05017-011 05017-004 05017-002 ADA4302-4 APPLICATIONS The ADA4302-4 active splitter is primarily intended for use in EVALUATION BOARDS the downstream path of television set-top boxes (STBs) that There are two evaluation boards for the ADA4302-4, a single- contain multiple tuners. It is located directly after the diplexer ended output board (ADA4302-4 EBSE) and a differential in a CATV customer premise unit. The ADA4302-4 provides a output board (ADA4302-4 EBDI). The single-ended output differential input and four differential outputs that allow the board has an input balun that converts a signal from a single- delivery of the RF signal to up to four different signal paths. ended source to a differential signal. The differential output These paths can include, but are not limited to, a main picture board uses the same input balun and allows the output signals tuner, the picture-in-picture (PIP) tuner, a digital video to run directly to the board connectors. This allows the recorder (DVR), and a cable modem (CM). differential signals at the ADA4302-4’s outputs to be applied directly to a tuner with differential inputs. The schematics for The differential nature of the ADA4302-4 allows it to provide these evaluation boards can be seen in Figure 16 and Figure 17, composite second-order (CSO) and composite triple beat respectively. (CTB) products that are −73 dBc and −66 dBc, respectively. The use of the SiGe process also allows the ADA4302-4 to achieve a Each board has place holders to properly terminate the unused noise figure (NF) that is less than 5 dB. outputs, if needed. On the single-ended output board, they are designated R15 through R18, and 75 Ω resistors should be used CIRCUIT DESCRIPTION here (see Figure 16). On the differential output board, 37.5 Ω The ADA4302-4 has a low noise buffer amplifier that is resistors should be used for R1, R2, and R4 through R9 when followed by four parallel amplifiers. This arrangement their respective outputs are not in use (see Figure 17). provides 4.6 dB of gain relative to the RF signal present at the differential inputs of the active splitter. The input and each RF LAYOUT CONSIDERATIONS output must be properly matched to a differential 75 Ω Appropriate impedance matching techniques are mandatory environment in order for distortion and noise performance when designing a circuit board for the ADA4302-4. Improper to match the data sheet specifications. If needed, baluns to characteristic impedances on traces can cause reflections that convert to single-ended operation can be used. The M/A-COM can lead to poor linearity. If the stage following the ADA4302-4 MABAES0029 is recommended for the input balun and the is a single-ended load with a 75 Ω impedance, then a balun Mini-Circuit® TC1-1-13M-2 is recommended for the output should be used. The characteristic impedance of the signal balun. AC coupling capacitors of 0.01 μF are recommended for trace from each output of a differential pair to the output all inputs and outputs. balun should be 37.5 Ω. In the case of the differential output evaluation board, the output traces should also have a Two 1 μH RF chokes, L1 and L2 (Coilcraft chip inductor characteristic impedance of 37.5 Ω. 0805LS-102X), are used to correctly bias internal nodes of the ADA4302-4 by connecting them between the 5 V supply and POWER SUPPLY ILN and ILP, respectively. 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 μF tantalum capacitor and a 0.01 μF ceramic chip capacitor located close to the ADA4302-4. In addition, the VCC pins should be decoupled to ground with a 0.01 μF 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 75Ω TRACE P4 R2 C3 T4 DNI 3 4 0.01μF R15 37.5Ω TRACES 75Ω TRACE DNI G1 G2 G3 G4 VCC AGND 1 5 VCC C2 + C13 C1 C11 0.01μF AGND 10μF 0.01μF 0.01μF AGND 75Ω TRACE AGND P3 C10 R6 C5 0.01μF T3 DNI 3 4 0.01μF R16 VCC 37.5Ω TRACES AGND 75Ω TRACE DNI AGND 1 5 L1 C4 1μH 0.01μF AGND C14 ILN 5 0.01μF VIP 7 T5 AGND 5 1 DUT 37.5Ω TRACES SPLITTER 75Ω TRACE 4 3 VIN 9 J1 R3 C19 ILP 11 DNI 0.01μF 75Ω TRACE 75Ω TRACE AGND P2 L2 R8 1μH C9 T2 DNI 3 4 0.01μF R17 37.5Ω TRACES 75Ω TRACE DNI AGND 1 5 VCC AGND C8 0.01μF AGND 75Ω TRACE P1 R10 C6 T1 DNI 3 4 0.01μF R18 37.5Ω TRACES 75Ω TRACE DNI AGND 1 5 C7 0.01μF AGND Figure 16. Single-Ended Output Evaluation Board Table 4. ADA4302-4ACPZ-EBSE Bill of Materials (BOM) Quantity Description Reference 2 Coilcraft 0805LS-102X Chip Inductor L1, L2 4 Mini-Circuit TC1-1-13M-2 Transformer T1 to T4 1 M/A-COM MABAES0029 Transformer T5 13 MLCC, 0.01 μF, C402 C1 to C11, C14, C19 1 Tantalum, 10 μF, B Size C13 1 ADA4302-4ACPZ DUT 5 SMA Connectors J1, P1 to P4 9 Impedance Matching Resistors, Insert as Needed R2, R3, R6, R8, R10, R15 to R18 Rev. B | Page 9 of 12 6 13 GND VCC GND 10 12 VCC GND 18 4 VCC 8 3 GNDC VCC VOP1 19 2 VON4 VON1 20 VOP4 1 VOP2 16 15 VON3 17 14 VON2 VOP3 05017-015 ADA4302-4 P4VDN R8 C3 DNI 0.01μF 37.5Ω TRACES 37.5Ω TRACES G1 G2 G3 G4 VCC R9 DNI AGND VCC P4VDP + C13 C1 C11 C2 10μF 0.01μF 0.01μF 0.01μF AGND AGND P3VDN C10 R1 C5 0.01μF DNI 0.01μF VCC 37.5Ω TRACES AGND 37.5Ω TRACES R2 DNI AGND P3VDP L1 1μH C4 0.01μF C14 ILN 5 0.01μF VIP 7 T5 DUT AGND 5 1 37.5Ω TRACES SPLITTER 75Ω TRACE 4 3 VIN 9 J1 C19 ILP 11 0.01μF 75Ω TRACE P2VDN L2 R4 1μH C9 DNI 0.01μF 37.5Ω TRACES 37.5Ω TRACES R5 VCC DNI AGND AGND P2VDP C8 0.01μF P1VDN R7 C6 DNI 0.01μF 37.5Ω TRACES 37.5Ω TRACES R6 DNI AGND P1VDP C7 0.01μF Figure 17. Differential Output Evaluation Board Table 5. ADA4302-4ACPZ-EBDI Bill of Materials (BOM) Quantity Description Reference 2 Coilcraft 0805LS-102X Chip Inductor L1, L2 1 M/A-COM MABAES0029 Transformer T5 13 MLCC, 0.01 μF, C402 C1 to C11, C14, C19 1 Tantalum, 10 μF, B size C13 1 ADA4302-4ACPZ DUT 9 SMA Connectors J1, P1VDN to P4VDN, P1VDP to P4VDP 8 Impedance Matching Resistors, Insert as Needed R1, R2, R4 to R9 Rev. B | Page 10 of 12 6 13 GND VCC GND 10 12 VCC GND 18 4 VCC 8 3 GNDC VCC VOP1 19 2 VON4 VON1 20 VOP4 1 VOP2 16 15 VON3 17 14 VON2 VOP3 05017-014 ADA4302-4 OUTLINE DIMENSIONS 0.60 4.00 MAX PIN 1 BSC SQ INDICATOR 0.60 MAX 20 16 1 15 PIN 1 2.25 INDICATOR TOP 3.75 2.10 SQ VIEW BCS SQ 1.95 11 5 0.75 10 6 0.55 0.25 MIN 0.35 0.80 MAX 0.30 12° MAX 0.65 TYP 1.00 0.23 0.05 MAX 0.85 0.18 0.02 NOM 0.80 0.20 SEATING COPLANARITY 0.50 REF PLANE 0.08 BSC COMPLIANT TO JEDEC STANDARDS MO-220-VGGD-1 Figure 18. 20-Lead Lead Frame Chip Scale Package [LFCSP_VQ] 4 mm × 4 mm Body, Very Thin Quad (CP-20-1) Dimensions shown in millimeters ORDERING GUIDE Model Ordering Quantity Temperature Range Package Description Package Option ADA4302-4ACP-REEL 5,000 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1 ADA4302-4ACP-RL7 1,500 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1 1 ADA4302-4ACPZ-RL 5,000 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1 1 ADA4302-4ACPZ-RL7 1,500 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1 1 ADA4302-4ACPZ-R2 250 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1 2 ADA4302-4ACPZ-EBSE 1 Single-Ended Evaluation Board 2 ADA4302-4ACPZ-EBDI 1 Differential Output Evaluation Board 1 Z = Pb-free part. 2 Evaluation board contains Pb-free part. Rev. B | Page 11 of 12 ADA4302-4 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05017–0–9/05(B) TTTT Rev. B | Page 12 of 12