GS7032-CTM データシートの表示（PDF） - Gennum -> Semtech

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GS7032-CTM

Digital Video Serializer

Gennum -> Semtech 

4. VCO CENTRE FREQUENCY SELECTION

The recommended RVCO value for auto rate SMPTE 259M-C

applications (270Mb/s) is 374Ω (see the Typical Application

Circuit).

The VCO and an internal divider generate the PLL clock.

5. LOCK DETECT OUTPUT

The Lock Detect output is available from pin 20 and is HIGH

when the loop is locked. When the loop is not locked, the

lock detect circuit mutes the serial data outputs.

6. SERIAL OUTPUTS

The true and complement serial data, SDO and SDO, are

available from pins 24 and 25. These outputs will drive two

75Ω co-axial cables with SMPTE level serial digital video

signals.

RSET calculation:

RSET

=

1----.--1---5---4-----×-----R----L---O----A----D-

VSDO

where RLOAD = RPULL-UP || ZO

TYPICAL APPLICATION CIRCUIT

VCC

J1

LBWC

VCC

100n

374

44 43 42 41 40 39 38 37 36 35 34

1 PD9

RESET 33 RESET

2 PD8

NC 32

3 PD7

BYPASS 31

4 PD6

NC 30

PARALLEL

DATA

INPUTS

5 PD5

6 PD4

7 PD3

GS7032

VEE 29

NC 28

NC 27

8 PD2

9 PD1

VEE 26

SDO 25

10 PD0

SDO 24

PARALLEL

CLOCK

11 PCLKIN

VEE 23

INPUT

12 13 14 15 16 17 18 19 20 21 22

75

75

100n

VCC

54.9

VCC

100n

All resistors on ohms,

all capacitors in farads,

unless otherwise stated.

VCC

VCC

100n

10k

VCC

220

LOCK

L

1µ

J3

R

L

1µ

J4

R

L = 8.2nH

R = 75Ω

8

GENNUM CORPORATION

14583 - 02

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