EL4544IGZ (Intersil) PDF资料下载 Datasheet(16/26 页)

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参数资料

型号：	EL4544IGZ
厂商：	Intersil
文件页数：	16/26页
文件大小：	0K
描述：	IC CROSSPOINT VID 16X5RGB 356BGA
标准包装：	400
功能：	交叉点开关
电路：	3 x 16:5
电压电源：	单电源
电压 - 电源，单路/双路(±)：	4.75 V ~ 5.25 V，2.4 V ~ 3.6 V
工作温度：	-40°C ~ 85°C
安装类型：	表面贴装
封装/外壳：	356-BGA
供应商设备封装：	356-PBGA（27x27）
包装：	散装
产品目录页面：	1246 (CN2011-ZH PDF)

FN7362.5

February 23, 2012

Functional Overview

Overall Functionality

The EL4544 is a video crosspoint switch that has 16 (RGB

differential) input channels (with H and V sync embedded in

their common-modes) which connect via an internal

crosspoint mux to 5 (RGB + HV) single-ended output

channels. The 5th output group has enhanced features that

include: a pixel-by-pixel overlay mux and auto-calibrated

offset cancellation. All analog and digital outputs have a

high-impedance state, allowing several EL4544 to share the

same output connections.

16 RGB Differential Video Inputs with Encoded

Sync

For each of the 16 RGB groups of differential video inputs,

horizontal and vertical sync are encoded as a combination of

the common modes for each RGB group. Each of these

differential input pins has a single-ended signal range that

spans the entire 0V to 5V supply range. The embedded sync

signals are provided by the EL4543 Triple Differential

Twisted Pair Driver IC.

Overall Analog Signal Flow

There are four independent internal input multiplexors

represented as Ai, Bi, Ci, and Di in the “I/O Block Diagram

of Video Signals with Power Supplies and References” on

page 12 and the “Serial Bus Interface Control Table” on

page 15 (hexa-decimal addresses 0h, 1h, 2h, 3h). These

muxes convert the selected RGB differential input signal to

single-ended RGB and extract H and V sync. The five output

crosspoint multiplexors represented as Ax, Bx, Cx, Dx, and

, can independently select from the four internal (RGBHV)

signal groups Ai, Bi, Ci, and Di by programming the

hexadecimal serial bus addresses 8h, 9h, Ah, Bh, and Ch.

There are five RGBHV single-ended output signal groups

labelled A, B, C, D, and S which buffer signals from the

corresponding crosspoint outputs Ax, Bx, Cx, Dx, and Sx.

Each of these output groups has an independent reference

pin (RefA, RefB, RefC, RefD, and RefS) that allows the user

to program the reference level that corresponds to a zero

voltage differential input.

Analog and Digital Video Outputs

All analog outputs (A, B, C, D, and S) have a signal range

from 0V to 3.5V and are capable of driving the 150

Ω load

presented by a terminated video cable. The H and V sync

outputs and all other digital I/O are compatible with 3V

operation; their signal swings are determined by connecting

the digital supply pin Vdp to a 3V source.

All the analog video outputs must be terminated with an AC

or DC coupled 150 load to ground. If power dissipation is

an issue and DC coupling is not desired, then placing a

150 resistor in series with a 100pF capacitor to ground will

provide adequate termination.

How to Configure the Analog Video Outputs to

Swing to 0V

The RGB analog outputs of the A, B, C, D, and S output

groups are all capable of a range of swing that reaches the

negative supply pin Vm = 0V. However, since the EL4544

has no internal supply connections, its single-ended outputs

run out of bandwidth, slew rate, and linearity below 0.5V. If

accurate wide band performance below 0.5V is required,

add external pull-down resistors between each analog

output and an external -5V supply.

This will keep the output stage biased. Values between 3k

to 1k

Ω are suggested. The lower the selected resistance, the

wider the bandwidth will be at 0V, but lower external

resistance will increase overall IC power dissipation

significantly since these resistors are loading their respective

output stages.

FIGURE 43. IP3 AVIN = 2 BLUE CHANNEL

FIGURE 44. IP3 AVIN = 1 BLUE CHANNEL

Typical Performance Curves (Continued)

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

9.995 9.997 9.999 10.001 10.003 10.005 10.007 10.009

FREQUENCY (MHz)

AMPLITUDE

(dBm

)

IP3 = 33.9

AVIN = 2

f1 = 10MHz

f2 = 10.004MHz

2f2-f1

2f1-f2