TEA2128 datasheet(4/8 Pages) STMICROELECTRONICS

4 / 8 page

ELECTRICAL CHARACTERISTICS (continued)

(TAMB =25

oC; VCC = 12V; Pulse duration 50% of the amplitude)

Symbol

Parameter

Pins

Test conditions

Min.

Typ.

Max.

Unit

NOISE GATE

Measure sampling time

On the synch. pulse bottom

µs

Max. push out current

Max. noise

350

µA

VCR switch inhibition threshold

7.3

Measure bandwidth (-3dB)

700

2000

kHz

Short time constant manual

switching threshold

Active under threshold

4.5

5.5

Long time constant

From lower to higher voltage

6.9

7.3

7.6

Manual switching threshold

From higher to lower voltage

6.8

7.2

7.5

φ 2 COMPARATOR (Pin 14)

Output current

During line flyback

± 600

µA

Delay between

φ 2 falling edge

and the middle video sync. pulse

23 -4

FVCO = 500 kHz

2.8

µs

LINE MONOSTABLE

Charge current

Line output high

- 67

µA

Discharge current

Line output low

120

µA

Flip-Flop threshold

Falling edge on the line output

1.3

LINE OUTPUT

Low level

I20=20 mA

Pulse duration

R18 = 3.32k

Ω ,C19 = 1.5nF

27.5

30.5

µs

φ 2 adjustment range

Controlled by V23 compared

with video signal

µs

LINE SAW-TOOTH

Charge Current

R18 = 3.32 k

Ω

- 180

µA

Discharge Current

Discharge Duration

Controlled by logic VCO 500kHz

6.5

µs

LINE FLYBACK INPUT

Blanking Line Threshold

0.38

0.4

0.42

φ 2 Loop Threshold and Line

Output Inhibition

2.85

3.15

Input Current

- 0.4V < V22 < 0.4V

0.4V < V22 <3V

3V < V22

-10

-5

-1

µA

SUPER SANDCASTLE GENERATOR

Burst Level

RL = 2.2 k

Ω to ground

Line Blanking

4.5

Frame Blanking

2.5

Delay between the midde of the

video sync. pulse and the rising

edge of the burst (t1)

2.8

µs

TEA2128

4/8

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