June 1993

7

Philips Semiconductors

Preliminary specification

Generic multi-standard decoder

TDA4657

CHARACTERISTICS

200 mV (peak-to-peak value) and nominal phase for NTSC unless otherwise specified. All voltages measured

referenced to ground.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

supply voltage

7.2

8.0

8.8

V

I

supply current

load

25

31

37

mA

total power dissipation

load

−

248

296

mW

CD signals outputs (pins 1 and 3)

PAL or NTSC

colour difference output signals

independent of supply voltage; note 1

−(R−Y) output PAL and NTSC 4.43 MHz

(peak-to-peak value)

442

525

624

mV

−(B−Y) output PAL and NTSC 4.43 MHz

(peak-to-peak value)

559

665

791

mV

ratio of CD signal amplitudes

V(R

−Y)/V(B−Y)

note 2

0.75

0.79

0.83

−

m

signal linearity

−(R−Y) output

0.8

−−

−

signal linearity

−(B−Y) output

0.8

−−

−

cut-off frequency (both outputs)

−3dB

−

1

−

MHz

chrominance delay time

220

270

320

ns

S/N

signal to noise ratio for nominal output

voltages

note 3

40

−−

dB

residual carrier at CD outputs

1

× subcarrier frequency

(peak-to-peak value)

−−

10

mV

2

× subcarrier frequency

(peak-to-peak value)

−−

30

mV

H/2 content at R

−Y output at nominal input

signal (peak-to-peak value)

−−

10

mV

A

crosstalk between CD Channels

−40

−−

dB

output resistance (npn emitter follower)

−−

200

Ω

output current

−−

−3mA