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NTE7138

Integrated Circuit Advanced Monitor Video Controller for OSD

NTE Electronics 

Electrical Characteristics (Cont’d): (VP = 8V, TA = +25°C, Note 3, Note 4 unless otherwise specified)

Parameter

Symbol

Test Conditions

Min Typ Max Unit

Crosstalk at Voltage Outputs with Speed Up Circuit (Note 18)

Transient Crosstalk

αct(tr)

Threshold Voltages for Clamping, Blanking and Switch–Off (Note 19)

–

– –20 dB

Threshold for Horizontal Blanking

(Blanking, Output Clamping)

Vi(HBL)

1.2 1.4 1.6 V

Threshold for Switch–Off (Blanking,

Minimum Black–Level, No Output

Clamping)

5.8 6.5 6.8 V

Input Resistance

Delay Between Horizontal Blanking

Input and Output Signal Blanking

Ri(HBL) Against GND

50 80 110 kΩ

td(Hblank) Input Rise Time at Pin9 > 100ns, – 40 60 ns

Note 20

Threshold for Vertical Blanking

(Blanking, No Input Clamping)

Vi(CL) Note 20

1.2 1.4 1.6 V

Threshold for Vertical Blanking

(Input Clamping, No Blanking)

2.6 3.0 3.5 V

Threshold for Test Mode

(No Clamping, No Blanking

See Vbl(TST) Above)

Current

Rise and Fall Time for Clamping Pulse

Width of Clamping Pulse

Delay Between Vertical Blanking Input

and Internal Blanking

For Test Mode Also,

Vi(HBL) > 6.8V (Switch–Off)

Ii(CL)

tr(CL), tf(CL)

tw(clamp)

td(Vblank)

Vi(CL) < VP –1V

Vi(CL) ≥ VP –1V

Note 20

Note 20

VP–1 –

VP

V

–3 –1 – µA

µA

–

– 75 ns/V

0.6 –

–

µs

260 320 380 ns

Notes to the Characteristics:

Note 3. All voltages measured to GND (Pin4).

Note 4. Definition of levels:

a) Artificial black level: internal signal level behind input emitter follower during input

clamping and signal clipping. This level is inserted instead of the input signal during

blanking.

b) Reference black level: DC voltage during output clamping at voltage outputs, not

influenced by brightness, contrast or gain setting, adjustable by cut–off stabilization.

c) Cut–off level: corresponding DC voltage at CRT cathode in closed feedback loop.

d) Black level: actual signal black level at either the voltage outputs or cathode, it can

be adjusted by (brightness x gain), it refers to reference black level or cut–off level.

e) Ultra–black level, switch–off level: lowest adjustable reference black level, lowest

signal level at voltage outputs.

f) The minimum guaranteed control range for reference black level is 0.1 to 1.0V. The

ultra–black level is dependent on the external resistor RO at Pin13, Pin16 and Pin19

(voltage outputs) to GND.

g) Vbl(SO) ≈

Ro

3.5kΩ +

Ro

x

4.65V

Note 5. Linear control range is 1 to 6V for Vi(BC), independent of supply voltage.

Note 6. Linear control range is 1 to 6V vor Vi(BC), independent of supply voltage. Open Pin6 leads

to maximum contrast setting. It is recommended not to exceed Vi(CC) = VP – 1V to avoid satu-

ration of internal circuitry. For Vi(CC) < Vi(CC) ≈ 0.7V a small negative signal (≈ –40dB) will

appear. For frequency dependency of contrast control, see Note 18.

Note 7. Definition for nominal output signals: input Vi(b–w) = 0.7V, gain Pin3 and Pin11 open–circuit,

contrast control Vi(CC) = Vi(CC)(nom).

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