ZXFV302_技术文档

ZXFV302

4:1 HIGH SPEED MULTIPLEXER

DEVICE DESCRIPTION

FEATURES AND BENEFITS

The ZXFV302 is a 4:1 high speed analog switch

designed for use as a buffered video m ultiplexer and

other high-speed applications.

•

3dB Bandwidth 300MHz

Slew rate 450V/ ␮s

Differential gain 0.01%

Differential phase 0.04Њ

Output current 40m A

Stable up to 100pF load

Ϯ5 Volt supply

It features low different gain and phase distortion. The

high speed high output current capability provides 75⍀

ca b le d rive fo r u s e in h ig h p e rfo rm a n ce vid e o

applications.

The input channel is selected by m eans of two logic

lines using an internal decoder. An output enable line

allows expansion to eight channels using two devices

ZXFV302 as shown in the exam ple application figure 1.

Supply current 17m A

16 pin SO package

APPLICATIONS

An alternative device, ZXFV301 provides the sam e

functionality and pin-out as the ZXFV302 but with four

separate logic lines controlling the switch channels

directly.

•

Video routing and switching

CCTV switching

Video distribution selection

RGB m ultiplexing

Connection Diagram

High frequency instrum entation Data acquisition

Data acquisition

1

2

3

4

5

6

7

8

1 6

1 5

1 4

1 3

1 2

1 1

1 0

9

IN 1

V+

O U T

0 V

IN 2

0 V

IN3

0 V

E N

A 0

A 1

IN 4

V-

N C

Z X FV3 0 2

Ordering inform ation

Pa rt Nu m b e r

ZXFV302N16TA

ZXFV302N16TC

Co n t a in e r

In cre m e n t

500

Re e l 7″

2500

Re e l 13″

Fig.1:Typical Application for 8 channel CCTV

ISSUE 4 - NOVEMBER 2002

1

ZXFV302

ABSOLUTE MAXIMUM RATINGS

Supply voltage V

-0.5V to +6V

-6V to +0.5V

CC

Supply voltage V

EE

Analog inputs to ground

Digital inputs to ground

Outputs to ground*

V

-0.5V to V +0.5V

EE CC

-0.5V to V +0.5V

V

EE

CC

-0.5V to VCC +0.5V

Output current, m ax continous

40m A

Operating Am bient Tem perature Range

-40ЊC to 85ЊC Storage -65ЊC to 150ЊC

150ЊC**

Operating J unction tem perature T

J MAX

**The therm al resistance from the sem iconductor die to am bient is typically 120ЊC/W when the SO16 package is

m ounted on a PCB in free air. The power dissipation of the device when loaded m ust be designed to keep the

device junction tem perature below T

.

J MAX

*During power-up and power-down, these voltage ratings require an appropriate sequence of applying and

rem oving signals and power supplies.

ELECTRICAL CHARACTERISTICS

Ϯ5V power supplies, T_{am b}= 25ЊC unless otherwise stated. R_L= 150⍀, C_L= 10pF

Characteristics apply to channel selected, and EN input HIGH unless otherwise stated

Test level:

P = 100% production test

C = characterised only

PARAMETER

CONDITIONS

TES T

MIN

4.75

-5.25

13

TYP

5

MAX UNIT

S u p p ly Vo lta g e V+

S u p p ly Vo lta g e V-

Po s itive s u p p ly cu rre n t

Ne g a tive s u p p ly cu rre n t

Vo lta g e g a in DC

5.25

-4.75

21

V

-5

P

C

P

C

17

m A

V/V

V

9

13

18

0.99

1.000

Ϯ3

45

1.01

In p u t Co m m o n m o d e Vo lta g e

In p u t re s is ta n ce

k⍀

m V

␮A

V

Ou tp u t o ffs e t Vo lta g e

In p u t b ia s cu rre n t

Ou tp u t Vo lta g e s w in g

Ou tp u t d rive cu rre n t

Ou tp u t re s is ta n ce

All ch a n n e ls h e ld a t 0V

-10

-25

+11

-11

Ϯ3

+30

+5

Active ch a n n e ls h e ld a t 0V

40

m A

⍀

1

Ou tp u t re s is ta n ce

Dis a b le d (EN lo w )

1.5

40

30

3

4.5

M⍀

dB

MHz

V/␮s

V

Po s itive PS RR

54

Ne g a tive PS RR

51

1

S m a ll s ig n a l b a n d w id th

300

450

S le w ra te , 25% to 75%

2V p k-p k

Lo g ic in p u t HIGH V

2

Hm in

Lo g ic in p u t LOW V

0.8

V

Lm a x

Lo g ic in p u t cu rre n t I

lo g ic in p u t vo lta g e = 5V

lo g ic in p u t vo lta g e = 0V

5

pA

␮A

INHIGH

INLOW

Lo g ic in p u t cu rre n t I

-70

ISSUE 4 - NOVEMBER 2002

2

ZXFV302

ELECTRICAL CHARACTERISTICS

Ϯ5V power supplies, T

= 25ЊC unless otherwise stated. R = 150⍀, C = 10pF

L L

am b

Characteristics apply to channel selected, and EN input HIGH unless otherwise stated

Test level:P = 100% production test

C = characterised only

PARAMETER

CONDITIONS

TES T

MIN

TYP

MAX UNIT

t

Vo u t = Ϯ2V, s e e tim in g d ia g ra m

10MHz, 0d Bm in

C

35

10

ns

ON

OFF

LOW

HIGH

50

ns

40

ns

1

Cro s s -ta lk, a ll h o s tile

Diffe re n tia l Ga in

75

dB

%

0.01

0.04

50

Diffe re n tia l Ph a s e

deg

m V

S w itch in g tra n s ie n ts ,

m a g n itu d e

All ch a n n e ls h e ld a t 0V

S w itch in g tra n s ie n ts ,

d u ra tio n

C

25

ns

Notes:

1. Bandwidth and cross talk m easured using Zetex Evaluation Circuit Board detailed later in this datasheet.

Truth table for selection of input channel

A1

X

0

A0

X

0

EN

0

OUT

Hi Z

IN 1

IN 2

IN 3

IN 4

1

0

1

0

1

Fig.2: TIMING DIAGRAM

Notes: The ‘select’ waveform represents a change in the the 2 bit control word A0 and A1.

_HIGHis equivalent to t_LOWbut , applies for a positive going transition of OUT.

t

ISSUE 4 - NOVEMBER 2002

3

ZXFV302

CHARACTERISTICS

ISSUE 4 - NOVEMBER 2002

4

ZXFV302

APPLICATIONS INFORMATION

BNC connector sockets allow connection to test

instrum ents via 50⍀ cables. The output circuit includes

a resistor m atching circuit to present a load of 150⍀ to

the device and sim ultaneously provide 50⍀ output

im pedance. The attenuation of this m atching circuit is

15.45 dB. As the device has unity voltage gain, the

overall loss when loaded by 75⍀ is also 15.45 dB.

Introduction

A typical circuit application is outlined in Figure 1,

above, where two devices are com bined to provide

8-to-1 m ultiplexing. A m ore detailed basic application

circuit for 4 dc-coupled channels is given in Figure 3,

and an AC coupled circuit for 8 channels is shown in

Fig u re 4. Th e s e circu its a re s u ita b le fo r 75⍀

transm ission line connections at both the input and the

output and are useful for distribution of wide-band

signals such as video via cables. The 75⍀ reverse

term inating resistor at the output gives the correct

m atching condition to a term inated video cable. The

am plifier load is then 150⍀.

EVALUATION CIRCUIT PARTS LIST:

QTY CCT-REF

VALUE DES CRIPTION

Re s is t o rs , s u rfa ce m o u n t

4

1

5

R1,R2,R3,R4

R5,R6,R7,R8

R9

51R

22k

0805

The wide bandwidth of this device necessitates som e

care in the layout of the printed circuit. Partly for this

reason, an Evaluation Circuit board is available and is

described in a later paragraph. A continuous ground

plane is required under the device and its signal

connection paths, to provide the shortest possible

ground return paths for signals and power supply

filt e r in g . A d o u b le -s id e d o r m u lt i-la y e r P CB

construction is required, with plated-through via holes

providing closely spaced low-inductance connections

from som e com ponents to the continuous ground

plane (som e of these holes are not visible in the figures

for the Evaluation Circuit Board – artworks and NC drill

output can be provided if required).

120R

62R

10R

47k

R10

R11

R12 to R16

Ca p a cit o rs , s u rfa ce m o u n t

6

100nF 25V ce ra m ic 0805

X7R

2

1nF

50V ce ra m ic 0805

NPO

For the power supply filtering, low inductance surface

m ount capacitors are norm ally required. It has been

found that very good RF decoupling is provided on

each supply using a 1000 pF NPO size 0805 ceram ic

surface m ount capacitor, closest to the device pin, with

an adjacent 0.1 ␮F X7R capacitor. Other configurations

are possible and it m ay be found that a single 0.01 ␮F or

0.1 ␮F X7R capacitor, size 0805 or sm aller, on each

supply gives good results. However this should be

supported by larger decoupling capacitors elsewhere

on the printed circuit board. Values of 1 to 10 ␮F are

re co m m e n d e d , p a rticu la rly w h e re th e vo lta g e

regulators are located m ore than a few inches from the

device. These larger capacitors are recom m ended to

be solid tantalum electrolytic or ceram ic types.

2

10␮F

16V Ta n t Ele c s ize

C

In t e g ra t e d Circu it s

1

U1

ᎏ

Ze te x ZXF 301N16

o r ZXFV302N16

Mis ce lla n e o u s

5

BNC S o cke t, PCB

s tra ig h t fla n g e ,

e .g . Tyco

B35N14H999X99

1

ᎏ

3-w a y PCB s cre w

te rm in a l b lo ck IMO

20.501/3S B

Evaluation Circuit

An evaluation circuit is available, constructed on a

double-side printed circuit board. The circuit is suitable

for both the ZXFV301 and ZXFV302 and either device

m ay be fitted. Figures 5 and 6 show the circuit diagram ,

and the layout of com ponents and copper. A parts list

is provided below. This layout serves as a useful

exam ple for m any applications, showing the practical

im plem entation of the advice given above in the

Introduction.

1

S W1

ᎏ

DIL s w itch , 8 w a y

10 TP1 to TP10

PCB te s t te rm in a l,

re d , W.Hu g h e s

100-107

ISSUE 4 - NOVEMBER 2002

5

ZXFV302

Figure 5: EVALUATION CIRCUIT & PRINTED BOARD LAYOUT

SHOWING TOP COPPER (overall dim ensions 4x3 inches)

ISSUE 4 - NOVEMBER 2002

8

ZXFV302

Figure 6: EVALUATION CIRCUIT BOARD BOTTOM COPPER

(viewed through from top)

ISSUE 4 - NOVEMBER 2002

9

ZXFV302

Notes

ISSUE 4 - NOVEMBER 2002

10

ZXFV302

Notes

ISSUE 4 - NOVEMBER 2002

11

ZXFV302

PACKAGE OUTLINE

DIM

Millim e tre s

In ch e s

MIN

MAX

10.00

MAX

0.394

A

B

C

D

E

F

G

H

I

9.80

0.386

0.05 BS C

0.02 REF

0.013

0.15

1.27 BS C

0.53 REF

0.33

0.51

4.00

1.75

0.25

8°

0.020

0.157

0.069

0.01

8°

3.80

1.35

0.053

0.004

0°

0.10

0°

0.40

1.27

6.20

0.016

0.228

0.05

0.244

J

5.80

Conform s to J EDEC MS-012AC Iss C (SO16N)

Europe

Am ericas

Asia Pacific

Zetex plc

Zetex Gm bH

Zetex Inc

Zetex (Asia) Ltd

Fields New Road

Chadderton

Streitfeldstraß e 19

D-81673 München

700 Veterans Mem orial Hwy

Hauppauge, NY11788

3701-04 Metroplaza, Tower 1

Hing Fong Road

Oldham , OL9 8NP

United Kingdom

Telephone (44) 161 622 4422

Fax: (44) 161 622 4420

uk.sales@zetex.com

Kwai Fong

Hong Kong

Telephone: (852) 26100 611

Fax: (852) 24250 494

asia.sales@zetex.com

Germ any

USA

Telefon: (49) 89 45 49 49 0

Fax: (49) 89 45 49 49 49

europe.sales@zetex.com

Telephone: (631) 360 2222

Fax: (631) 360 8222

usa.sales@zetex.com

These offices are supported by agents and distributors in m ajor countries world-wide.

This publication is issued to provide outline inform ation only which (unless agreed by the Com pany in writing) m ay not be used, applied or

reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services

concerned. The Com pany reserves the right to alter without notice the specification, design, price or conditions of supply of any product or

service.

For the latest product inform ation, log on to

w w w .zetex.com

ISSUE 4 - NOVEMBER 2002

12


型号：	ZXFV302
厂家：	ZETEX SEMICONDUCTORS
描述：	4:1 HIGH SPEED MULTIPLEXER 4 ： 1高速多路复用器复用器
文件：	总12页 (文件大小：272K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ZXFV302 [ZETEX]

相关型号：

ZXFV302EV

ZXFV302N16

ZXFV302N16TA

ZXFV302N16TC

ZXFV401

ZXFV401N16TA

ZXFV401N16TC

ZXFV4089

ZXFV4089

ZXFV4089N8

ZXFV4089N8TA

ZXFV4089N8TA