BA7242F-E1 [ROHM]

Color Signal Encoder, PDSO14, SOP-14;


型号：	BA7242F-E1
厂家：	ROHM
描述：	Color Signal Encoder, PDSO14, SOP-14 光电二极管
文件：	总7页 (文件大小：75K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Multimedia ICs

Color TV signal encoder

BA7242F

The BA7242F is an IC which converts analog RGB signals to NTSC and PAL color TV signals. In addition to com-

posite output, luminance output, chrominance output, and analog RGB output are available. Each type of output is

equipped with an internal 75Ω driver.

Applications

•

TV peripheral devices

Features

•

1) Supports both NTSC and PAL systems.

2) Internal flip-flop circuit for PAL common mode

switching

4) Internal 75Ω driver

5) Supports subcarrier pulse for color input

3) Equipped with Y / C separated output pin.

Block diagram

•

CLAMP

BIN

GIN

V^CC2

Y^OUT

VOUT

BFP

CLAMP

BFP

RIN

CLAMP

BFP

V^CC1

SYNC

BFP

11 GND2

C^OUT

NT / PAL

SCIN

GND1

Multimedia ICs

BA7242F

Absolute maximum ratings (Ta = 25°C)

•

Parameter

Symbol

V^CC

Limits

Unit

Power supply voltage

Power dissipation

450

°C

Operating temperature

Storage temperature

Topr

Tstg

– 20 ~ + 70

– 55 ~ + 125

°C

Reduced by 4.5mW for each increase in Ta of 1°C over 25°C.

(When mounted on a 70mm × 70mm × 1.6mm glass epoxy board.)

Recommended operating conditions (Ta = 25°C)

•

Parameter

Symbol

VCC

υRI

Limits

4.5 ~ 5.5

0 ~ 0.7

Unit

Power supply voltage

RIN input level

V^P–P

VP–P

GIN input level

υGI

0 ~ 0.7

BIN input level

υBI

0 ~ 0.7

SCIN input level

υSC

0.45 ~ 0.60

Pin descriptions

•

Pin No.

Pin name

BIN

Function

Input for analog B signal. Operate with low impedance.

Input for analog G signal. Operate with low impedance.

Input for analog R signal. Operate with low impedance.

V^CCfor all except 75Ω driver.

GIN

RIN

V^CC1

Input for composite SYNC signal. Outputs SYNC signal to VOUT and YOUT pins

when input is LOW.

SYNC

BFP

Input for burst timing signal. Simultaneously performs the burst output and initiates

the pedestal clamp for the RIN, GIN, and BIN input signals when input is LOW.

GND1

SCIN

NT / PAL

C^OUT

GND for all except 75Ω driver.

3.58MHz or 4.43MHz pulse signal input.

Video signal output mode setting. HIGH level = NTSC, LOW level = PAL.

Chrominance signal output. Internal 75Ω driver.

GND for 75Ω driver.

GND2

V^OUT

Composite video signal output. Internal 75Ω driver.

Luminance signal output. Internal 75Ω driver.

V^CCfor 75Ω driver.

YOUT

VCC2

Multimedia ICs

BA7242F

Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5V, SCIN = 3.579545MHz, NT / PAL = 5V)

•

Parameter

Symbol

I^CC

Min.

Typ.

Max.

Unit

Conditions

Current consumption

Luminance level

υL

0.63

0.19

0.37

0.07

0.27

0.70

0.21

0.41

0.08

0.30

0.77

0.23

0.45

0.09

0.33

V^P-P

VP-P

υ^RI= υ GI = υ BI = 0.7VP-P

Luminance level R

Luminance level G

Luminance level B

Synchronization level

υL(R)

υL(G)

υ^L(B)

υS

υRI = 0.7VP-P

υGI = 0.7VP-P

YOUT

VOUT

υBI = 0.7VP-P

Synchronization /

luminance level ratio

R S / L

0.38

0.43

0.48

—

R^YO= υYS / υYL

Red / burst level ratio

Green / burst level ratio

Blue / burst level ratio

Red phase

R ^{R / BU}

R G / BU

R B / BU

θR

2.84

2.65

2.01

3.16

2.95

2.24

104

241

347

0.29

—

3.48

3.25

2.47

114

251

357

0.32

—

υRI = 0.7VP-P

υGI = 0.7VP-P

—

υBI = 0.7VP-P

deg

V^P-P

mVP-P

deg

—

Green phase

θG

231

337

0.26

—

COUT

VOUT

Blue phase

θB

Burst level

υBU

Carrier leak

υCL

θBU +

θBU –

R BU

V YO

V CO

V VO

125

215

0.9

135

225

1.0

145

235

1.1

NT / PAL = 0V

PAL burst phase

PAL burst ratio

NT / PAL = 0V

YOUT DC voltage

COUT DC voltage

VOUT DC Voltage

1.60

2.20

1.35

2.00

2.60

1.75

2.40

3.00

2.15

High level input voltage

SYNC, BFP, NT / PAL

V IH

V IL

V ^IH

V ^IL

2.0

—

Low level input voltage

SYNC, BFP, NT / PAL

0.8

300

200

Input current during high

SYNC, BFP, NT / PAL

µA

With 5V applied

With 0V applied

Input current during low

SYNC, BFP, NT / PAL

2 Guaranteed design with these parameters

3 Measured using a 3.58MHz BPF for 3.5µs after the burst.

4 Measured using a 3.58MHz BPF.

᭺ Not designed for radiation resistance

Multimedia ICs

BA7242F

Measurement circuit

•

VCC

0.1µ

BIN input

GIN input

RIN input

CLAMP

BFP

0.1µ

YOUT

measurement point

CLAMP

220µ

BFP

VOUT

measurement point

CLAMP

BFP

V^CC

COUT

measurement point

Composite SYNC

0.47µ

Vcc

Burst flag pulse

(BFP)

0.1µ

560

4.7k

Color subcarrier

Operation description

•

(1) The composite SYNC is input to the SYNCIN pin.

During Low level input, the SYNC signal is output to

the YOUT, VOUT, and SYNCOUT pins.

PAL. For NTSC, this pin is connected to V^CCand for

PAL, this pin is connected to GND.

(4) The SCIN pin is the color subcarrier input pin. Input

either a pulse wave or a sine wave of frequency

3.579545MHz for NTSC or of frequency 4.433619MHz

for PAL.

(2) The burst flag pulse is input to the BFPIN pin.

During Low level input, the burst signal is output to the

COUT and VOUT pins. For PAL, the phase inversion of

the chroma signal occurs according to this signal.

Furthermore, this signal also acts as the timing for the

pedestal clamp for the RIN, GIN, and BIN pins. By

using an external condenser for charging during Low

level input, the pedestal levels for the RIN, GIN, and

BIN pins are maintained at a uniform level.

(5) The COUT pin is the output pin for the chroma sig-

nal, and the YOUT pin is the output pin for the lumi-

nance signal. This is compatible with the S pin because

the chroma signal and the luminance signal can be out-

put separately. Both pins have internal 75Ω drivers.

(6) The VOUT pin is the output pin for a color TV signal

and has an internal 75Ω driver.

(3) The NT / PAL pin is for selecting either NTSC or

Multimedia ICs

BA7242F

Application example (When using NTSC color TV signal)

•

0.1µ

VCC

Analog B signal

Analog G signal

CLAMP

BFP

CLAMP

BFP

Color TV signal output

CLAMP

Analog R signal

220µ

BFP

V^CC

Composite SYNC

V^CC

Burst flag pulse

(BFP)

0.1µ

4.7k

Color subcarrier

560

Operation notes

External dimensions (Units: mm)

•

(1) Since analog RGB signals perform clamping at the

input pin, input them with a low impedance.

(2) Input a signal of duty 50% for the color subcarrier. If

the duty fluctuates, it will affect the chroma phase.

Furthermore, for the application example, a voltage-

dividing resistor is assumed for the CMOS input of 5V^P-P.

For other input formats, regulate the SCIN pin for

0.5V^P-P.

8.7 ± 0.2

(3) Input the composite SYNC and burst flag pulse

according to the standard value. If the timing is off, the

TV receiver may not show any color. As well, set the

input level the same as the TTL level. The input imped-

ance is 8kΩ.

1.27

0.4 ± 0.1

0.3Min.

0.15

SOP14

Product Designation

Page 1 of 2

ROHM-logo

Product Designation

When ordering, specify the part number.

Check each code against the tables shown below.

Fill in from the left, leaving any extra boxes empty on the

right.

Product Designation

Ordering information

Packing and forming information only required for SOP, and QFP

parts that are required in tape and reel containers. For example,

to order part BA4558F on paper tape type E2, order number is

BA4558F-E2, when required in tube container, order number is

BA4558F.

Quick reference of packaging specifications

Container

type

Packaging

specification code

Package

Tube

container

DIP/SDIP

Tube

container

SIP/HSIP/ZIP/SZIP/RSIP-A3

Tube

container

SOP/SSOP/HSOP/WSOP-10/WSOP-

L10

Embossed

tape

E1, E2

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Product Designation

Page 2 of 2

Embossed

tape

SSOP-A54

Tray

Tray (dry

QFP/SQFP/VQFP/UQFP/TQFP/PBGA pack)

Embossed

tape

E1, E2

Bulk

TO220FP

Tube

container

Embossed

tape

SMP5

TL, TR

E1, E2

Embossed

tape

TO252

RSLP8

Embossed E2(Sprocket 1pin,

tape

Horizontal)

E2(Sprocket 1pin,

Embossed Horizontal), E4

RSIP13

tape

(Sprocket 1pin,

Vertical)

Note: SOP type can be delivered in tube, paper tape, or embossed tape.

BGA/CSP package | SIP/ZIP package

QFP package | Photo package

SOP package | Product Designation

DIP package | Packaging Specification

[LSI Package Assemblies]

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BA7242F-E1 [ROHM]

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