NTE7048 查看數據表（PDF） - NTE Electronics

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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

Peaking of Luminance Signal

Input Impedance (Pin15)

Output Impedance (Pin10)

|Z15|

|Z10|

7

10

13 kΩ

50

75

90 Ω

Luminance Gain Ratio

Note 3

–

10

–

Chrominance Amplifier (Pin3)

Input Signal Amplitude (Peak–to–Peak Value) V3(P–P) Note 4

–

550

– mV

Note 5

–

–

1100 mV

Minimum Burst Signal Amplitude within the ACC

Control Range (Peak–to–Peak Value)

35

–

– mV

Change of Red Output Signal over 30dB ACC

Control Range

∆V12

–

–

2 dB

Input Impedance (Pin3)

|Z3|

Input Capactiance

C3

6

9

12 kΩ

–

4

6 pF

Saturation Control Range

50

–

– dB

Saturation Control Input Current (Pin5)

Input Impedance (Pin5)

I5

V5 < 6V

–

1

20 µA

|Z5| V5 = 6V to 10V

1.5

2.1

2.7 kΩ

Color Killer Active

1.5

2.1

2.7 kΩ

Tracking Between Luminance and Chrominance

Contrast Control

For 10dB of Control –

1

2 dB

ALC Circuit

Chrominance/Burst Ratio at which ALC

Commences

Note 6

–

2.9

–

Reference Part (Note 7)

Phase–Locked–Loop

Phase–Locked–Loop Catching Range

∆f

±300 ±400

– Hz

Phase Shift for 400Hz Deviation of fOSC

∆ϕ

–

–

5 deg

Oscillator (See Note 7)

Oscillator Temperature Coefficient of Oscillator

Frequency

TCOSC

–

–1.5 –2.5 Hz/K

Frequency Deviation

Input Resistance (Pin18)

Input Capacitance (Pin18)

∆fOSC

R18

C18

∆VP = ±10%

–

150 250 Hz

1.0

1.4

1.8 kΩ

–

–

10 pF

Note 3. Pin10 AC short–circuit to GND.

Note 4. Indicated is a signal for color bar with 75% saturation, so the chrominance to burst ratio is 2.2:1.

Note 5. Before clipping occurs in the input stage.

Note 6. The ALC circuit limits the chromunance amplitude to a particular value as soon as the chro-

minance/burst ratio exceeds 2.9: to 1. The limiting is performed via the ACC function.

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

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