ANALOG DEVICES ADA4302-4 Service Manual

www.BDTIC.com/ADI

Active RF Splitter

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

APPLICATIONS

Cable set-top boxes Home gateways CATV distribution systems Cable splitter modules

GENERAL DESCRIPTION

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.

The ADA4302-4 features four differential outputs. The

ferential architecture allows systems designed with the

dif 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.

J1

–55

–60

–65

–70

CSO (dBc)

–75

–80

ADA4302-4

FUNCTIONAL BLOCK DIAGRAM

VCC

+

GND

VCC

ILN VIP

GND

VCC

TA = +85°C

T

A

SPLITTER

VIN

ILP

GND

Figure 1.

TA = +25°C

= –40°C

VON4

VOP4

VON3

VOP3

VON2

VOP2

VON1

VOP1

05017-016

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her 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.

–85

50 1000

Figure 2. Composite Second-Order (CSO) vs. Frequency

100

FREQUENCY (MHz)

05017-008

ADA4302-4

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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

hanges to Format .............................................................Universal

C

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

Applications........................................................................................8

Circuit Description .......................................................................8

Evaluation Boards .........................................................................8

RF Layout Considerations............................................................8

Power Supply..................................................................................8

Outline Dimensions ....................................................................... 11

Ordering Guide .......................................................................... 11

10/04—Revision Sp0: Initial Version

Rev. B | Page 2 of 12

ADA4302-4

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SPECIFICATIONS

VCC = 5 V, RIN = RL = 75 Ω, TA = 25°C, unless otherwise noted. The ADA4302-4 is characterized using a balun1 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)

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.

135 Channels, 15 dBmV/Channel, 100% modulation @ 15.75 kH

z, f = 103.25 MHz

−67 −64 dBc

Rev. B | Page 3 of 12

ADA4302-4

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ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage 5.5 V Storage Temperature Range −65°C to +125°C Operating Temperature Range −40°C to +85°C Lead Temperature (Soldering 10 sec) 300°C Junction Temperature 150°C

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.

Stresses above those listed under Absolute Maximum Rating

ma

y 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.

Rev. B | Page 4 of 12

ADA4302-4

V

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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

GND

VOP1

VON1 20

1VOP4

ON4

2

ADA4302-4

3VCC

TOP VIEW

4VCC

(Not to Scale)

5ILN

6

GND

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

VON2 17

18

19

PIN 1 INDICATOR

9

8

7

VIP

VIN

GNDC

VOP2 16

10

GND

15 VON3 14 VOP3 13 VCC 12 VCC 11 ILP

05017-001

Rev. B | Page 5 of 12

ADA4302-4

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TYPICAL PERFORMANCE CHARACTERISTICS

–55

7

–60

–65

–70

CSO (dBc)

–75

–80

–85

50 1000

TA = +85°C

T

A

100

= –40°C

TA = +25°C

FREQUENCY (MHz)

Figure 4. Composite Second-Order (CSO) vs. Frequency

–55

–60

TA = +25°C

–65

CTB (dBc)

–70

TA = +85°C

TA = –40°C

05017-008

6

5

4

NOISE FIGURE (dB)

3

2

50 100 1000

TA = +85°C

TA = +25°C

TA = –40°C

FREQUENCY (MHz)

Figure 7. Noise Figure vs. Frequency

90

80

70

60

50

OUTPUT IP2 (dBm)

40

05017-006

–75

50 1000

100

FREQUENCY (MHz)

Figure 5. Composite Triple Beat (CTB) vs. Frequency

–55

–60

TA = –40°C

–65

CXM (dBc)

–70

–75

TA = +85°C

50 100 1000

TA = +25°C

FREQUENCY (MHz)

Figure 6. Cross Modulation (CXM) vs. Frequency

05017-009

05017-010

Rev. B | Page 6 of 12

30

50 100 1000

FREQUENCY (MHz)

Figure 8. Output IP2 vs. Frequency

25

20

15

10

OUTPUT IP3 (dBm)

5

0

50 100 1000

FREQUENCY (MHz)

Figure 9. Output IP3 vs. Frequency

05017-012

05017-013

ADA4302-4

www.BDTIC.com/ADI

10

5

TA = –40°C

TA = +25°C

0

–5

0

–5

GAIN (dB)

–10

–15

–20

50 100 100001000

Figure 10. AC Response (S21)

0

–10

–20

–30

ISOLATION (dB)

–40

TA = +85°C

FREQUENCY (MHz)

05017-003

–10

–15

INPUT RETURN LOSS (dB)

–20

–25

50 100 1000

FREQUENCY (MHz)

Figure 13. Input Return Loss vs. Frequency (S11)

0

–5

–10

–15

OUTPUT RETURN LOSS (dB)

–20

05017-002

–50

50 100 1000

Figure 11. Output-to-Input Isol

FREQUENCY (MHz)

ation vs. Frequency (S12)

0

–5

–10

–15

–20

ISOLATION (dB)

–25

–30

–35

50 100 1000

Figure 12. Output-to-Output Is

FREQUENCY (MHz)

olation vs. Frequency

05017-005

05017-007

–25

50 100 1000

FREQUENCY (MHz)

Figure 14. Output Return Loss vs. Frequency (S22)

240

235

230

225

220

215

210

QUIESCENT SUPPLY CURRENT (mA)

205

200

–60 –40 –20 0 20 40 60 80 100

TEMPERATURE (°C)

Figure 15. Quiescent Supply Current vs. Temperature

05017-004

05017-011

Rev. B | Page 7 of 12

ADA4302-4

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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

mposite second-order (CSO) and composite triple beat

co (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.

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 Ω 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® TC1-1-13M-2 is recommended for the output balun. AC coupling capacitors of 0.01 μF are recommended for all inputs and outputs.

Two 1 μH RF chokes, L1 and L2 (Coilcraft chip inductor 0805LS-102X), ADA4302-4 by connecting them between the 5 V supply and ILN and ILP, respectively.

are used to correctly bias internal nodes of the

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

spectively.

re

Each board has place holders to properly terminate the unused

utputs, if needed. On the single-ended output board, they are

o designated R15 through R18, and 75 Ω resistors should be used here (see Figure 16). On the differential output board, 37.5 Ω r

esistors should be used for R1, R2, and R4 through R9 when

their respective outputs are not in use (see

Figure 16 and Figure 17,

Figure 17).

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 Ω 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 Ω. In the case of the differential output evaluation board, the output traces should also have a characteristic impedance of 37.5 Ω.

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 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

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J1

0.01μF

75Ω TRACE

R3

DNI

AGND

G2G1

AGND

C14

AGND

C19

0.01μF

75Ω TRACE

R2

R15 DNI

R16 DNI

R17 DNI

R18 DNI

1

T3

3 1

T2

3 1

T1

3 1

VOP4

1

20

VON1

VON3

15

16

VOP2

VOP3

14

17

VON2

37.5Ω TRACES

G4G3

VCC

+

C13

C1

0.01μF

ILN VIP

VIN ILP

AGND

5 7

9

11

AGND

C11

0.01μF

C10

0.01μF

VCC

VCC 13

12

DUT

SPLITTER

10

6

GND

VCC

4

18

GND

VON4

VCC

3

2

19

8

VOP1

GNDC

10μF

AGND

VCC

L1

1μH

T5

5 4

1

37.5Ω TRACES

3

L2

1μH

VCC

T4

3

0.01μF

4

75Ω TRACE

5

AGND

0.01μF

4

75Ω TRACE

5

AGND

0.01μF

4

75Ω TRACE

5

AGND

0.01μF

4

75Ω TRACE

5

C3

C5

C9

C6

C2

0.01μF

75Ω TRACE

C4

0.01μF

75Ω TRACE

C8

0.01μF

75Ω TRACE

DNI

R6

DNI

R8

DNI

R10 DNI

P4

AGND

P3

AGND

P2

AGND

P1

AGND

C7

0.01μF

05017-015

Figure 16. Single-Ended Output Eva

AGND

luation 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 13 MLCC, 0.01 μF, C402 1 Tantalum, 10 μF, B Size 1 ADA4302-4ACPZ 5 SMA Connectors

T5 C1 to C11, C14, C19 C13 DUT 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

ADA4302-4

www.BDTIC.com/ADI

P4VDN

P4VDP

P3VDN

P3VDP

P2VDN

P2VDP

J1

C14

0.01μF

75Ω TRACE

G2G1

AGND

C19

0.01μF

75Ω TRACE

AGND

R8 DNI

37.5Ω TRACES R9 DNI

R1 DNI

37.5Ω TRACES R2 DNI

R4 DNI

37.5Ω TRACES R5 DNI

C3

0.01μF

C2

0.01μF

C5

0.01μF

C4

0.01μF

C9

0.01μF

C8

0.01μF

1

20

VON3

15

16

VOP2

VOP3

14

17

VON2

37.5Ω TRACES

VCC

G4G3

VCC

+

C13

C1

0.01μF

ILN VIP

VIN ILP

AGND

5 7

9

11

AGND

C11

0.01μF

C10

0.01μF

VCC

VCC 13

12

SPLITTER

10

6

GND

VCC

4

DUT

18

GND

VCC

3

8

GNDC

VON4

2

19

VOP1

VOP4

VON1

10μF

AGND

VCC

L1

1μH

T5

5 4

1

37.5Ω TRACES

3

L2

1μH

VCC

C6

37.5Ω TRACES

0.01μF

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 1 Tantalum, 10 μF, B size 1 ADA4302-4ACPZ 9 SMA Connectors

C1 to C11, C14, C19 C13 DUT J1, P1VDN to P4VDN, P1VDP to P4VDP

8 Impedance Matching Resistors, Insert as Needed R1, R2, R4 to R9

AGND

R7 DNI

37.5Ω TRACES R6

DNI

P1VDN

P1VDP

05017-014

Rev. B | Page 10 of 12

ADA4302-4

R

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OUTLINE DIMENSIONS

0.60

MAX

0.75

0.55

0.35

0.08

0.60

MAX

16

15

11

10

PIN 1

INDICATOR

20

1

5

6

0.30

0.23

0.18

2.25

2.10 SQ

1.95

0.25 MIN

PIN 1

INDICATO

1.00

0.85

0.80

SEATING

PLANE

4.00

BSC SQ

12° MAX

TOP

VIEW

0.80 MAX

0.65 TYP

0.50 BSC

COMPLIANT TO JEDEC STANDARDS MO-220-VGGD-1

0.20 REF

3.75

BCS SQ

0.05 MAX

0.02 NOM COPLANARITY

Figure 18. 20-Lead Lead Frame Chip Scale Package [LFCSP_VQ]

mm × 4 mm Body, Very Thin Quad

4

(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 ADA4302-4ACPZ-RL ADA4302-4ACPZ-RL7 ADA4302-4ACPZ-R2 ADA4302-4ACPZ-EBSE ADA4302-4ACPZ-EBDI

1

Z = Pb-free part.

2

Evaluation board contains Pb-free part.

1

5,000 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1

1

1,500 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1 250 −40°C to +85°C 20-Lead LFCSP_VQ CP-20-1

2

1 Single-Ended Evaluation Board

2

1 Differential Output Evaluation Board

Rev. B | Page 11 of 12

ADA4302-4

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NOTES

T

Rev. B | Page 12 of 12

TTT

ANALOG DEVICES ADA4302-4 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

FUNCTIONAL BLOCK DIAGRAM

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

ESD CAUTION

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TYPICAL PERFORMANCE CHARACTERISTICS

APPLICATIONS

CIRCUIT DESCRIPTION

EVALUATION BOARDS

RF LAYOUT CONSIDERATIONS

POWER SUPPLY

OUTLINE DIMENSIONS

ORDERING GUIDE