TDA9170 datasheet(11/22 Pages) PHILIPS

11 / 22 page

October 1994

Philips Semiconductors

Preliminary speciﬁcation

YUV picture improvement processor based

on histogram modiﬁcation

TDA9170

Processing of measured histogram values

ADAPTIVE GAMMA CONTROL RANGE

Gadg(min)

minimum gain for HM1

−

Gadg(max)

maximum gain for HM1

−

ADAPTIVE GAMMA SETTING ADGAM (PIN 4); note 3; see Fig.8

Vadg(l)

control voltage lower limit

−

1.75

−

Vadg(h)

control voltage upper limit

−

3.25

−

IibADG

input bias current

−

0.1

µA

Gadp(min)

minimum gain for HM1

no offset; GVAR = 1

−

Gadp(max)

maximum gain for HM1

no offset; GVAR = 1

−

ADAPTIVE GAMMA BY BLACK OFFSET

Gadb(min)

minimum gain for HM1

no offset; GVAR = 1

−

Gadb(max)

maximum gain for HM1

maximum offset;

GVAR = 1

−

2.5

−

WHITE-POINT STRETCH

Gwp

maximum gain luminance for

white stretch

HM-pattern = 01103:

Gnl = 1

−

1.09

−

Non-linear ampliﬁer

NON-LINEAR GAIN SET BY HMX (PINS 16 TO 20)

Qnl(b)

segment bleeder accuracy

−

Gnl(min)

minimum gain segment

HM-pattern = 31100:

Gnl = 1

−

0.36

−

Gnl(max)

maximum gain segment

HM-pattern = 31100:

Gnl = 1

−

2.28

−

NON-LINEARITY SETTING AMPNLA (PIN 3); note 3

Vnl(l)

control voltage lower limit

−

1.75

−

Vnl(h)

control voltage upper limit

−

3.25

−

Iib(nl)

input bias current

−

0.1

µA

DYNAMICS

td(nl)

delay between linear and

non-linear path

−

Variable gamma

VARIABLE GAMMA CONTROL RANGE

GVAR(min)

minimum variable gamma

setting

−

0.5

−

GVAR(max)

maximum variable gamma

setting

−

1.5

−

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

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