TDA9171 datasheet(8/20 Pages) PHILIPS

8 / 20 page

1996 Jun 17

Philips Semiconductors

Preliminary speciﬁcation

YUV picture improvement processor based

on histogram modiﬁcation and blue stretch

TDA9171

Histogram measurement

HISTOGRAM UPDATES AT HMX (PINS 9 TO 13)

QHMb

segment bleeder accuracy

−−

VHM(av)

average voltage level for 5 segments

−

1.0

−

VHM(min)

minimum segment voltage level

−−

VHM(max)

maximum segment voltage level

−

5.0

−

IHMbias

input bias current

−−

0.1

µA

TIME CONSTANT CONTROL TAUHM (PIN 8)

tthmr

response speed

see Fig.3

−−−

Qthms

static error

see Fig.4

−−−

Ithm(bias)

input bias current

−−

0.1

µA

Vthm(l)

control voltage lower limit

−

1.0

−

Vthm(h)

control voltage upper limit

−

2.0

−

MISCOUNT DETECTION

Qmc(d)

miscount detection level

−

td(mcp)

miscount propagation delay

20% step

−

tmcd(o)

miscount detection on-time each

event

−

0.36

−µs

tmcY

mismatch propagation delay and

luminance delay

−−

Qmc(aW)

miscount activation level at white

no miscount

−

Qmc(dW)

miscount deactivation level at white

miscount

−

Processing of measured histogram values

WHITE POINT STRETCH

GWP

maximum gain luminance for white

stretch (HM pattern = 00113)

maximum NLC gain

−

1.1

−

Non-linear ampliﬁer

NON-LINEAR GAIN SET BY HMX (PINS 9 TO 13)

Qnl(b)

segment bleeder accuracy

−−

Gnlc(min)

minimum gain segment

(HM pattern = 31100)

maximum NLC gain

−

0.36

−

Gnlc(max)

maximum gain segment

(HM pattern = 31100)

maximum NLC gain

−

2.28

−

NON-LINEAR SETTING NLC (PIN 4)

Gnlc

non-linear control curve

see Fig.5

−−−

ViNLC(l)

control voltage lower limit

−

ViNLC(h)

control voltage upper limit

−

5.0

−

IiNLC(bias)

input bias current

−−

0.5

µA

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

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