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NTE7048

Integrated Circuit NTSC Decoder w/Fast RGB Blanking

NTE Electronics 

Electrical Characteristics (Cont’d): (TA = +25°C, VP = 12V, All voltages referenced to Pin19, unless

otherwise specified)

Parameter

Symbol Test Conditions Min Typ Max Unit

Reference Part (Cont’d) (Note 7)

ACC Generation (Pin4)

Control Voltage at Nominal Input Signal

V4

Control Voltage without Burst Input

–

5.2

–

V

–

2

–

V

Color–Off Voltage

–

2.6

–

V

∆Color On/Off Voltage

∆V4

Control Voltage at Nominal Input Signal (Pin2)

V2

Hue Control

100 300 500 mV

–

5.2

–

V

Input Current (Pin17)

I17

V17 < 5V

Input Impedance (Pin17)

|Z17| V15 > 5V

Demodulator Part; Ratio of Demodulated Signals ±25% (Note 8)

–

0.5 20.0 µA

1.5

2.5

3.5 kΩ

(R – Y)/(B – Y)

(G – Y)/(R – Y)

(G – Y)/(B – Y)

Frequency Response between 0 and 0.7MHz

RGB Matrix and Amplifiers

V12/V14

V13/V12

V13/V14

σ17

No (R – Y) Signal

No (B – Y) Signal

No (R – Y) Signal

– –0.29 –

– –0.39 –

– –0.10 –

–

–

–3 dB

Output Signal Amplitude (Peak–to–Peak Value)

Output Signal Amplitude of the “Blue” Channel

(B – Y) at Pin14 (Peak–to–Peak Value)

V12, V13,

V14(p–p)

V14(p–p)

Note 9

Note 10

4.0

5.0

6.0 V

–

3.8

–

V

Maximum Peak–White Level

Available Output Current (Pin12, Pin13, Pin14)

Difference in Black Level between the Three

Channels

Brightness Control Input Current

Variation of Black Level with Temperature

V12, V13,

V14 (m)

I12, I13, I14

∆V12,

∆V13,

∆V14

–I9

∆V/∆T

Note 11

9.0

9.3

9.6 V

10

–

– mA

–

–

600 mV

–

–

–50 µA

–

0.15 1.0 mV/K

Variation of Black Level with Contrast

∆V Note 12

–

75

200 mV

Note 7. All frequency variations are referenced to the 3.58MHz carrier frequency.

Note 8. These matrixed values are found when hue is in a normal condition and by measuring the ratio

of the various output signals. The values are derived from the following matrix equations:

(R – Y)matrixed = 1.29 (R – Y)IN – 0.29 (B – Y)IN

(G – Y)matrixed = –0.50 (R – Y)IN – 0.10 (B – Y)IN

(B – Y)matrixed = (B – Y)IN

Note 9. With nominal luminance and contrast (black–to–white), nominal contrast is specified as

maximum contrast –4dB and nominal saturation as maximum saturation –9dB.

Note10. With nominal contrast, saturation and hue, no luminance input.

Note 11. When this level is exceeded the amplifier of the output signal is reduced via a discharge of

the capacitor on Pin6 (contrast control). Discharge current is 7mA.

Note12. Control range: Nominal –10dB.

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