Renesas ISL59481EVAL1 User manual

USER’S MANUAL

AN1235

Rev 0.00

Feb 2, 2006

ISL59481EVAL1

Evaluation Board User’s Guide

AN1235 Rev 0.00 Page 1 of 7

Feb 2, 2006

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-

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 2 of 7

Feb 2, 2006

ISL59481EVAL1

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:

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).

FIGURE 1. ISL59481EVAL1 TOP VIEW

AN1235 Rev 0.00 Page 3 of 7

Feb 2, 2006

ISL59481EVAL1

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 back-

termination resistors for cable driving. The ISL59481

operates in unity gain, and the EL5364 triple op amp gain is

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 Rf and

Rg gain resistors. Gain reduction is best achieved using the

divider network Rs and Rt. Capacitor pads (Cnp) are

provided to adjust the frequency response of the amplifier.

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.

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.

FIGURE 2. VIDEO SIGNAL PATH

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

ISL59481

VIN

75

Cnp*

RS, 75

1/3 EL5364

75

VOUT

Rt,

* Cnp is not populated and is provided for

frequency response adjustment

562

432

499

AN1235 Rev 0.00 Page 4 of 7

Feb 2, 2006

ISL59481EVAL1

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

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,

increases the number of channels scanned from 2 to 4. The

complete list of channel scan jumper options are shown in

Table 2.

FIGURE 3. CHANNEL SCAN OSCILLATOR

U4C

AUTO-

STEP

SINGLE-

STEP

TO BINARY

COUNTER CLK

MOMENTARY

CONTACT SWITCH 2.2M

1µF

TABLE 2. CHANNEL SCAN SELECT LOGIC TABLE

CHANNELS

SCANNED

JUMPER POSITION SWITCH POSITION CHANNELS SELECTED

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

8 AutoAutoAuto- - - XXXXXXXX

4 Manual Auto Auto 0 - - X X X X

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

2 Manual Manual Auto 0 0 - 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

AN1235 Rev 0.00 Page 5 of 7

Feb 2, 2006

ISL59481EVAL1

ISL59481EVAL1 Schematic Diagram

1 OUTC1

2 OUTB1

4 OUTA1

6 EN1

7 HIZ1

9 IN0B1

10 IN0A1

11 GND

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 26

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

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.

15 N.C.

N.C.

15 N.C.

N.C.

NO1

NO3

COM

NO7

NO5

INH

GND

V-

V+

NO4

NO0

NO6

ADDC

ADDB

ADDA

NO2

LOGIC

0

V-SYNC

H-SYNC

H-Sync

V-Sync

H-Sync

V-Sync

H-Sync

V-Sync

H-Sync

V-Sync

H-Sync

V-Sync

N.C.

H-Sync

V-Sync

N.C.

H-Sync

V-Sy nc

H-Sync

V-Sync

H-Sync

V-Sync

V+ (+5V)

V- (-5V)

ISL59481

U2 U3

U4F

GND

ISL84051

U4A

U4B

U4D

U4E

11 10

714 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

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

Single-

step

Auto-

step

Auto

Manual

External

Control

U4A

U6A

U6B

U6C

0

562432

432

562

562432

0

EL5364

499

75

AN1235 Rev 0.00 Page 6 of 7

Feb 2, 2006

ISL59481EVAL1

ISL59481EVAL1 Components List

COMPONENT VALUE TOLERANCE RATING COMPONENT VALUE TOLERANCE RATING

PWB ISL59481EVAL1RE

VA PCB

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

1x3, BRKAWY

1X36, 0.1

N/A N/A

U1 - 8:1 RGB Video

MUX

ISL59481IRZA

QFN48 Pb-Free

Intersil Corp. N/A D1, D2 DIODE-

RECTIFIER, SMD

SOD-123, 2PIN

N/A N/A

U2, U3 - 8:1 Analog

MUX

ISL84051IBZ

SOIC16 Pb-Free

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

0805, DNP, DNP,

DNP, TF

MBR0540T1-T 40V, 0.5A

U4 - Hex Inverter SN74HC14D

SOIC14

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

0603, 75

N/A N/A

U5 - 4-Bit Binary

Counter

SN74HC161D

SOIC16

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

0603, 432

1% 0.10W

U6 - Triple 600MHz

CFA Op Amp

EL5364ISZ SOIC16

Pb-Free

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

0603, 562

1% 0.10W

C4, C7 CAP, SMD, 0603

1000pF

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

R32, R35, R38, R43-R49

RESISTOR, SMD,

0805, 75,

1% 1/10W

C2, C5, C8-C13,

C21, C22

CAPACITOR, SMD,

0603, 0.1µF

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

R34, R39, R68-R70

RESISTOR, SMD,

0805, 0,

N/A 1/10W

C3, C6 CAPACITOR, SMD,

0805, 10µF

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

0805, 10k

5% 1/10W

C1 CAPACITOR, SMD,

0805, 2.2µF

10%, X5R 16V R1 RESISTOR, SMD,

0805, 2.2M

5% 1/8W

C14-C20 CAPACITOR, SMD,

0805, DNP-PLACE

HOLDER

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

R40, R41

RESISTOR, SMD,

0805, 4.7k

5% 1/10W

IN0-IN7,

VIDEO_OUT

CONN-SUB MINI D,

15PIN,

RECEPTACLE, RT

ANGLE, FRONT

METAL SHELL

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

0805, 499

5% 1/10W

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

BANA-SS-

SDRLESS, VERTIC

N/A N/A S0-S2 SWITCH-

TOGGLE, THRU,

SPDT, 5 P, ON-N

N/A N/A

J2 CONN-HEADER,

4PIN, BRKAWY,

2.54mm, VERTICAL

J2 S3 SWITCH-

PUSHBUTTON,

TH, 6mm, 4P,

ON/OFF,

N/A 12V, 0.05A

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