Renesas ISL59481EVAL1 User Manual

USER’S MANUAL

ISL59481EVAL1

Evaluation Board User’s Guide

Introduction

The ISL59481EVAL1 evaluation board contains the ISL59481 Dual 4:1 RGB MUX amp and associated components needed to implement an 8:1 RGB+H/V sync video multiplexer. The 8 video input ports, and single output port are accessed using standard 15 pin VGA female connectors. The I/O connectors are compatible with most VGA, SVGA and XGA video sources and video monitors with VGA cable interfaces. A typical application would use the ISL59481EVAL1 board to multiplex anywhere from 2 to 8 PC’s or laptops to a single video monitor or projector.

Evaluation Board Description and Key Features

The multiplexing of the RGB video is performed by the ISL59481. Multiplexing the H and V sync signals is accomplished using two ISL84051 8:1 analog switches. The ISL59481 Video MUX and the analog H and V sync multiplexers have the same input channel select logic coding, and are parallel-connected to form a single 3 input binary coded interface (S0, S1, S2). The evaluation board contains three different channel select options via jumpers on the board. Switches on the board enable direct logic control in binary format. The on-board oscillator and 4-bit counter can be connected to provide a continuous channel-

AN1235

Rev 0.00

Feb 2, 2006

by-channel scan of as few as 2 input channels up to all 8. An added option allows the user to disconnect the auto-scan oscillator and use the on-board momentary-contact switch to manually scan through the selected channels.

Reference Documents

• ISL59481 Data Sheet, FN7456

Getting Started

The evaluation board should have the same appearance as the silk screen shown in Figure 1. Prior to applying power, connect the source input VGA cables and the evaluation board output VGA cable to the respective video components. The evaluation board, as supplied, is designed for 75 source impedances and requires a 75 termination impedance in the output display device.

Applying Power to the Evaluation Board

The following safeguards will ensure correct power-up.

1. Limit the current on ±5V supplies to 250mA.

2. Turn on the power supplies after the power cables are attached to the evaluation board.

Power supply protection Schottky diodes are included on the ±5V supplies to prevent damage due to reverse polarity.

Evaluation Board Jumper, Cable Header, and Switch Descriptions

COMPONENT DESCRIPTION

JUMPERS

J1 Selects channel select via single-step momentary contact switch S4, or auto mode using on-board oscillator

J-S0 Selects S0 logic input to manual control via switch S0 or through external control ribbon cable header

J-S1 Selects S1 logic input to manual control via switch S1 or through external control ribbon cable header

J-S2 Selects S2 logic input to manual control via switch S2 or through external control ribbon cable header

HEADERS

EN External MUX enable: Internal pull-down (logic 0) enables RGB+H/V output, logic high disables RGB and H/V sync output

S0 External S0 channel select logic input

S1 External S1 channel select logic input

S2 External S2 channel select logic input

SWITCHES

S0 Manual channel select logic input S0

S1 Manual channel select logic input S1

S2 Manual channel select logic input S2

S3 Momentary contact channel select step control

AN1235 Rev 0.00 Page 1 of 7 Feb 2, 2006

ISL59481EVAL1

FIGURE 1. ISL59481EVAL1 TOP VIEW

Testing the Evaluation Board

Testing the video and sync signal paths is accomplished using 1 or more RGB+H/V test video sources and a video monitor as the measurement device. Before powering the board, connect the jumpers as follows:

AN1235 Rev 0.00 Page 2 of 7 Feb 2, 2006

1. Connect jumpers J-S0, J-S1 and J-S2 to the MANUAL position (center to right post).

2. Connect jumper J1 to the single-step position (center to left post).

ISL59481EVAL1

ISL59481

75

Cnp*

RS, 75

1/3 EL5364

75

OUT

Rt,

* Cnp is not populated and is provided for frequency response adjustment

562

432

499

The following tests should be performed in the order shown.

Power Supply Tests

1. Connect an ammeter in series with the +5V and -5V supply.

2. Connect power supplies to the respective +5V, -5V and ground banana jacks.

3. Set supplies to +5V; ±50mV and -5V; ±50mV. Supply power to the board.

4. Measure +5V supply current = +110mA ±20mA

5. Measure -5V supply current = -100mA ±20mA

Channel Select Logic and Video Performance Test

1. Calibrate the video test source with the video monitor by connecting the source(s) to the video monitor and selecting a display suitable for verifying correct luminance, display resolution and H/V sync lock. The test display in the following evaluation board tests should be identical to the test display.

2. Re-connect the video monitor to the VIDEO_OUT VGA connector on the evaluation board.

3. Connect the video test source to IN0. Additional video sources can speed up the verification process. If more than 1 test source is available connect each in sequential fashion to IN1, IN2 etc.

4. Set switches S0, S1 and S2 to the GND position and apply power.

5. After ~3s the test display supplied to IN0 should appear on the test monitor exactly as it appeared in step 1.

NOTE: The ~3s delay is a built in delay common in many display devices to lock onto the H/V sync signals and adjust the picture prior to enabling the display screen.

6. Perform the display test on the remaining video inputs by moving the video input source to the appropriate input according to the truth table in Table 1.

Auto-Scan Test

1. Connect scope probe to the J1 AUTO pin and observe a logic level (0 to +5V) square wave with ~3s period.

2. Connect jumpers J-S0, J-S1, and J-S2 to the AUTO position (center to left post).

3. Connect jumper J1 to the AUTO position and observe that the display scans all the test sources connected to the input channels (center to right post).

4. Connect jumper J1 to the single-step position and use the momentary contact switch S4 to manually all the test sources.

Test completed.

RGB Video Signal Path

The video inputs are terminated with 75 resulting in an overall RGB video path gain of 1 when using 75 video source impedance and load terminations (Figure 2). The RGB outputs contain series-connected 75 backtermination resistors for cable driving. The ISL59481 operates in unity gain, and the EL5364 triple op amp gain is

AN1235 Rev 0.00 Page 3 of 7 Feb 2, 2006

set to 2.3 to compensate for the interstage and output impedance matching loss. Two methods of gain adjustment are provided. Increasing gain to compensate for cable attenuation can be accomplished using the EL5364 R R

gain resistors. Gain reduction is best achieved using the

divider network R

and Rt. Capacitor pads (Cnp) are

and

provided to adjust the frequency response of the amplifier.

FIGURE 2. VIDEO SIGNAL PATH

Channel Select Logic

The ISL59481 RGB MUX and the H/V sync MUX share the same 1 of 8 input channel select logic inputs (S0, S1, S2). The channel select logic is shown in Table 1. Three methods of channel select logic control are provided using jumpers.

TABLE 1. CHANNEL SELECT TRUTH TABLE

S2 S1 S0 VIDEO OUT

000 IN0

001 IN1

010 IN2

011 IN3

100 IN4

101 IN5

110 IN6

111 IN7

Auto Sequencing Using the On-Board Oscillator

An on-board 0.3Hz R-C oscillator (Figure 3) drives the master clock of the 4-bit binary counter, which generates the channel select logic inputs S0, S1 and S2. The default 6s channel scan rate provides the time needed by the display to sync-lock and adjust the picture prior to enabling the display. The 2.2M(R1) resistor value can be reduced to speed up the channel scan time. Jumper J1 is provided to select either the 6s auto-step timer, or the momentary contact switch for manual stepping.

ISL59481EVAL1

U4C

AUTOSTEP

SINGLESTEP

TO BINARY COUNTER CLK

MOMENTARY

CONTACT SWITCH

2.2M

1µF

channel scan is enabled. The MANUAL position connects the on-board SPDT switches (S0, S1, and S2) for manual selection. A parallel-connected EXTERNAL CONTROL ribbon cable header is provided for external channel select control.

A wide range of auto-scan options can be selected by connecting only 1 or 2 of the 3 jumpers to the internal logic, with the remainder connected to the switch. For example, connecting jumper J-S0 to the AUTO position and connecting jumpers J-S1 and J-S2 to the MANUAL position with the switches S1 and S2 to the logic 0 state limits the channel scan to only 2 of the 8 channels (IN0 and IN1). Moving a second jumper from the MANUAL position to the AUTO position,

FIGURE 3. CHANNEL SCAN OSCILLATOR

Internal and External Channel Select Logic

J-S0, J-S1 and J-S2 are two-position jumpers that control the method of channel selection. In the AUTO position, the internal

TABLE 2. CHANNEL SCAN SELECT LOGIC TABLE

CHANNELS

SCANNED

8 AutoAutoAuto- - - XXXXXXXX

4 Manual Auto Auto 0 - - X X X X

2 Manual Manual Auto 0 0 - X X

JUMPER POSITION SWITCH POSITION CHANNELS SELECTED

J-S2 J-S1 J-S0 S2 S1 S0 IN0 IN1 IN2 IN3 IN4 IN5 IN6 IN7

Manual Auto Auto 1 - - X X X X

Auto Manual Auto - 0 - X X X X

Auto Manual Auto - 1 - X X X X

Auto Auto Manual - - 0 X X X X

Auto Auto Manual - - 1 X X X X

Manual Manual Auto 0 1 - X X

Manual Manual Auto 1 0 - X X

Manual Manual Auto 1 1 - X X

Auto Manual Manual - 0 0 X X

Auto Manual Manual - 0 1 X X

Auto Manual Manual - 1 0 X X

Auto Manual Manual - 1 1 X X

Manual Auto Manual 0 - 0 X X

Manual Auto Manual 0 - 1 X X

Manual Auto Manual 1 - 0 X X

Manual Auto Manual 1 - 1 X X

increases the number of channels scanned from 2 to 4. The complete list of channel scan jumper options are shown in Table 2.

AN1235 Rev 0.00 Page 4 of 7 Feb 2, 2006

ISL59481EVAL1

1 OUTC1

2 OUTB1

4 OUTA1

6 EN1

7 HIZ1

9 IN0B1

10 IN0A1

11 G ND

12 IN1A1

24 OUTA2

21 OUTC2

5 V1+

IN0C1

22 OUTB2

23 V2-

13 IN2B2

14 IN2C2

15 GND

16 IN3A2

20 S0-2

19 S1-2

18 IN3C2

17 IN3B2

3 V1-

IN2A2 36

GND 35

IN1B2 33

GND 31

IN0A2 30

IN0B2 29

IN0C2 28

HIZ2 27

EN2

V2+ 25

IN1A2 32

IN1C2 34

SO-1 48

S1-1 47

IN3B1 45

GND 43

IN2C1 42

IN2B1 41

IN2A1 40

GND 39

IN1C1 38

IN1B1 37

IN3A1 44

IN3C1 46

1 2

6 7

8 9

10 11 12

13 14 15

Video Out

Input IN6

(IN2X2)

Input IN0

(IN0X1)

Input IN7

(IN3X2)

Input IN4

IN0X2

Input IN5

IN1X2

Input IN1

(IN1X1)

Input IN2

(IN2X1)

NO1

NO3

COM

NO7

NO5

INH

GND

V-

V+

NO4

NO0

NO6

ADDC

ADDB

ADDA

NO2

LOGIC

N.C.

1 2

6 7

8 9

10 11 12

13 14 15

N.C.

1 2 4 6 7 89

131415

N.C.

1 2 4 6 7 89

131415

N.C.

1 2

6 7

10 11

13 14 15

N.C.

1 2

6 7

10 11

13 14 15

N.C.

NO1

NO3

COM

NO7

NO5

INH

GND

V-

V+

NO4

NO0

NO6

ADDC

ADDB

ADDA

NO2

LOGIC

0

V-SY NC

H-SYNC

H-Sync V-Syn c

R G B

H-Sync V-Syn c

R G B

H-Sync V-Syn c

R G B

H-Sync V-Sy nc

R G B

H-Sync

V-Sy nc

RGB

1 2 4 6 7 89

131415

N.C.

H-Sync

V-Syn c

RGB

1 2 4 6 7 89

131415

N.C.

H-Sync

V-Sy nc

RGB

1 2 4 6 7 89

131415

H-Sync

V-Sy nc

RGB

H-Sync

V-Sy nc

RGB

V+ (+5V)

V- ( -5V)

ISL59481

U4F

GND

ISL84051

U4A

U4B

U4D

U4E

14 V+

V+

RCO 15

QA 14

QB 13

QC 12

U4C

13 12

QD 11

1 Reset 2 CLK 3 P0

9 LD 10 ENT

4 P1 5 P2 6 P3 7 ENP

16 V+

8 GND

GND

74HC14D

74HC161D

2.2M

J-S0

J-S1

J-S2

1µF

EN S0 S1 S2

V+

4.7k

75

10k

75

10k

75

0

4.7k

10k

0

10k

IN3-R IN3-G IN3-B

IN2A2 IN2B2 IN2C2

IN2-R IN2-G IN2-B

IN3A2 IN3B2 IN3C2

IN6-R

IN1C1 IN1B1 IN1A1

IN6-G

IN6-B

IN2C1 IN2B1 IN2A1

IN3-R IN3-G IN3-B

Input IN3

(IN3X1)

IN1-R

IN1-G IN1-B

IN0C1 IN0B1 IN0A1

75

IN3C1 IN3B1 IN3A1

IN5-B

IN5-G

IN5-R

IN4-R

IN4-G

IN4-B

IN0-B

IN0-G

IN0-R

Singlestep

Autostep

Auto

Manual

External Control

U4A

U6A

U6B

U6C

0

562

432

562

432

0

EL5364

499

75

ISL59481EVAL1 Schematic Diagram

AN1235 Rev 0.00 Page 5 of 7 Feb 2, 2006

ISL59481EVAL1

ISL59481EVAL1 Components List

COMPONENT VALUE TOLERANCE RATING COMPONENT VALUE TOLERANCE RATING

PWB ISL59481EVAL1RE

VA PCB

- 8:1 RGB Video

MUX

, U3 - 8:1 Analog

MUX

- Hex Inverter SN74HC14D

- 4-Bit Binary

Counter

- Triple 600MHz

CFA Op Amp

C4, C7 CAP, SMD, 0603

C2, C5, C8-C13, C21, C22

C3, C6 CAPACITOR, SMD,

C1 CAPACITOR, SMD,

C14-C20 CAPACITOR, SMD,

IN0-IN7, VIDEO_OUT

+5V, -5V, EN, GND CONN-JACK,

J2 CONN-HEADER,

ISL59481IRZA QFN48 Pb-Free

ISL84051IBZ SOIC16 Pb-Free

SOIC14

SN74HC161D SOIC16

EL5364ISZ SOIC16 Pb-Free

1000pF

CAPACITOR, SMD, 0603, 0.1µF

0805, 10µF

0805, 2.2µF

0805, DNP-PLACE HOLDER

CONN-SUB MINI D, 15PIN, RECEPTACLE, RT ANGLE, FRONT METAL SHELL

BANA-SSSDRLESS, VERTIC

4PIN, BRKAWY,

2.54mm, VERTICAL

Intersil Corp. N/A J-S0, J-S1, J-S2, J1 CONN-HEADER,

1x3, BRKAWY 1X36, 0.1

Intersil Corp. N/A D1, D2 DIODE-

RECTIFIER, SMD SOD-123, 2PIN

Intersil Corp. N/A R3-R5, R55-58, R64-R66 RESISTOR, SMD,

0805, DNP, DNP, DNP, TF

N/A N/A R10-R12 RESISTOR, SMD,

0603, 75

N/A N/A R62, R67, R73 RESISTOR, SMD,

0603, 432

Intersil Corp. N/A R63, R71, R72 RESISTOR, SMD,

10%, X7R 25V R6-R9, R16, R21-R29,

R32, R35, R38, R43-R49

N/A 25V R13-R15, R17-R20, R33,

R34, R39, R68-R70

10%, X5R 6.3V R42, R50-R54. RESISTOR, SMD,

10%, X5R 16V R1 RESISTOR, SMD,

N/A N/A R2, R30, R31, R36, R37,

R40, R41

N/A N/A R59, R60, R61 RESISTOR, SMD,

N/A N/A S0-S2 SWITCH-

J2 S3 SWITCH-

0603, 562

RESISTOR, SMD, 0805, 75,

RESISTOR, SMD, 0805, 0,

0805, 10k

0805, 2.2M

RESISTOR, SMD, 0805, 4.7k

0805, 499

TOGGLE, THRU, SPDT, 5 P, ON-N

PUSHBUTTON, TH, 6mm, 4P, ON/OFF,

N/A N/A

MBR0540T1-T 40V, 0.5A

N/A N/A

1% 0.10W

1% 1/10W

N/A 1/10W

5% 1/10W

5% 1/8W

5% 1/10W

N/A N/A

N/A 12V, 0.05A

AN1235 Rev 0.00 Page 6 of 7 Feb 2, 2006

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Renesas ISL59481EVAL1 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual