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STV6888

LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR

STMicroelectronics 

STV6888

7.4 - HORIZONTAL SECTION

Vcc = 12V, Tamb = 25°C

Symbol

PLL1

IRO

CCO

fHO

fHO(0)

fHOCapt

Parameter

Test Conditions

Min.

Current load on RO pin

Capacitance on CO pin

390

Frequency of hor. oscillator

Free-running frequency of hor. oscill. (1) RRO=5.23kΩ, CCO=820pF 27

Hor. PLL1 capture frequency (4)

fHO(0) = 28.5kHz

29

Value

Typ.

28.5

Max.

1.5

100

29.9

122

Units

mA

pF

kHz

kHz

kHz

----∆----f--H----O-----(--0---)----

fHO(0) ⋅ ∆T

Temperature drift of free-running freq. (3)

-150

ppm/°C

∆fHO/∆VHO Average horizontal oscillator sensitivity fHO(0) = 28.5kHz

VHO

H. oscill. control voltage on pin HPLL1F VRefO=8V

1.4

VHOThrfr

Threshold on H. oscill. control voltage on

HPLL1F pin for tracking of EW with freq.

VRefO=8V

VHPosF

Control voltage on HPosF pin

HPOS (Sad01):

1111111xb

1000000xb

0000000xb

VHOThrLo

VHOThrHi

Bottom of hor. oscillator sawtooth(6)

Top of hor. oscillator sawtooth(6)

PLL2

RIn(HFly)

Input impedance on HFly input

V(HFly) >VThrHFly (2)

300

IInHFly

Current into HFly input

At top of H flyback pulse

VThrHFly

Voltage threshold on HFly input

0.6

VS(0)

H flyback lock middle point(6)

No PLL2 phase modula-

tion

VBotHPLL2C

VTopHPLL2C

Low clamping voltage on HPLL2C pin(5)

High clamping voltage on HPLL2C pin(5)

tph(min)/TH

Min. advance of H-drive OFF before

middle of H flyback(7)

Null asym. correction

tph(max)/TH

Max. advance of H-drive OFF before

middle of H flyback(8)

Null asym. correction

H-drive output on pin HOut

IHOut

tHoff/TH

Current into HOut output

Duty cycle of H-drive signal

Output driven LOW

HDUTY (Sad00):

x1111111b

x0000000b

Soft-start/Soft-stop value

Picture geometry corrections through PLL1 & PLL2

tHph/TH

H-flyback (center) static phase vs. sync

signal (via PLL1), see Figure 7

HPOS (Sad01):

1111111xb

0000000xb

19.6

5.0

2.8

3.4

4.0

1.6

6.4

500

0.7

4.0

1.6

4.0

0

44

27

65

85

+11

-11

kHz/V

6.0

V

V

V

V

V

V

V

700 Ω

5

mA

V

V

V

V

%

%

30 mA

%

%

%

%

%

11/47

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