Datasheet NTE7048 Datasheet (NTE)

NTE7048

Integrated Circuit

w

NTSC Decoder

Description:

The NTE7048 is a monolithic integrated decoder for the NTSC color television standard. This device
combines all functions required for the identification and demodulation of NTSC signals ina 20–Lead
DIP type package. Furthermore, it contains a luminance amplifier, an RGB–matrix and amplifier.
These amplifiers supply output signals up to 5V
crete output stages.

Features:

D Automatic Chrominance Leveling (Avoids Saturation at the Chrominance Input)
D Peaking Circuit with DC Control
D Fast RGB Output Blanking

Absolute Maximum Ratings:

Supply Voltage (Pin1), V
Total Power Dissipation, P
Operating Ambient Temperature Range, T
Storage Temperature Range, T
Thermal Resistance, Junction–to–Ambient, R

P

tot

stg

/Fast RGB Blanking

(Picture information) enabling direct drive of dis-

P–P

A

thJA

13.2V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1700mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–25° to +65°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–55° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50K/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Characteristics:

(TA = +25°C, VP = 12V, All voltages referenced to Pin19, unless
otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Supply (Pin1)

Supply Voltage V
Supply Current I
Total Power Dissipation P
Luminance Amplifier (Pin8)
Input Voltage (Peak–to–Peak Value) V
Input Level before Clipping V
Input Current I
Contrast Control Range – –17 to +3 – dB
Input Current Contrast Control I

P
P
tot

8(P–P)

8

8

6

Note 1 – 450 – mV

V6 < 6V – 0.5 15.0 µA
V6 = 2.5V, Note 2 3 7 – mA

10.8 12.0 13.2 V
– 90 – mA
– 1.08 – W

– – 1.0 V
– 0.15 1.0 µA

Note 1. Signal with negative going sync; amplitude includes sync. pulse amplitude.
Note 2. Peak white limiter active.

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) |Z15| 7 10 13 kΩ
Output Impedance (Pin10) |Z10| 50 75 90 Ω
Luminance Gain Ratio Note 3 – 10 –
Chrominance Amplifier (Pin3)
Input Signal Amplitude (Peak–to–Peak Value) V

3(P–P)

Note 4 – 550 – mV
Note 5 – – 1100 mV

Minimum Burst Signal Amplitude within the ACC

35 – – mV

Control Range (Peak–to–Peak Value)

Change of Red Output Signal over 30dB ACC

∆V

12

– – 2 dB

Control Range
Input Impedance (Pin3) |Z3| 6 9 12 kΩ
Input Capactiance C

3

– 4 6 pF
Saturation Control Range 50 – – dB
Saturation Control Input Current (Pin5) I

5

V5 < 6V – 1 20 µA

Input Impedance (Pin5) |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

For 10dB of Control – 1 2 dB

Contrast Control

ALC Circuit

Chrominance/Burst Ratio at which ALC

Note 6 – 2.9 –

Commences

Reference Part (Note 7)

Phase–Locked–Loop
Phase–Locked–Loop Catching Range ∆f ±300 ±400 – Hz
Phase Shift for 400Hz Deviation of f

OSC

∆ϕ – – 5 deg

Oscillator (See Note 7)
Oscillator Temperature Coefficient of Oscillator

TC

OSC

– –1.5 –2.5 Hz/K

Frequency
Frequency Deviation ∆f
Input Resistance (Pin18) R
Input Capacitance (Pin18) C

OSC

18
18

∆VP = ±10% – 150 250 Hz

1.0 1.4 1.8 kΩ
– – 10 pF

Note 3. Pin10 AC short–circuit to GND.
Note 4. Ind i c a te d is a s i gnal f or c olor b ar w ith 7 5% s aturation, s o t he c hrominance t o b urst r atio i s 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.

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 V

4

– 5.2 – V

Control Voltage without Burst Input – 2 – V
Color–Off Voltage – 2.6 – V
∆Color On/Off Voltage ∆V
Control Voltage at Nominal Input Signal (Pin2) V

4

2

100 300 500 mV

– 5.2 – V

Hue Control

Input Current (Pin17) I

17

V17 < 5V – 0.5 20.0 µA
Input Impedance (Pin17) |Z17| V15 > 5V 1.5 2.5 3.5 kΩ
Demodulator Part; Ratio of Demodulated Signals ±25% (Note 8)
(R – Y)/(B – Y) V12/V
(G – Y)/(R – Y) V13/V
(G – Y)/(B – Y) V13/V
Frequency Response between 0 and 0.7MHz σ

17

No (R – Y) Signal – –0.29 –

14

No (B – Y) Signal – –0.39 –

12

No (R – Y) Signal – –0.10 –

14

– – –3 dB

RGB Matrix and Amplifiers

Output Signal Amplitude (Peak–to–Peak Value) V

Output Signal Amplitude of the “Blue” Channel

12, V13,

V

14(p–p)

V

14(p–p)

Note 9 4.0 5.0 6.0 V

Note 10 – 3.8 – V

(B – Y) at Pin14 (Peak–to–Peak Value)

Maximum Peak–White Level V12, V13,

V

14 (m)

Available Output Current (Pin12, Pin13, Pin14) I
Difference in Black Level between the Three

Channels

12, I13, I14

∆V12,
∆V

13

∆V

Brightness Control Input Current –I

Note 11 9.0 9.3 9.6 V

10 – – mA

– – 600 mV

,

14
9

– – –50 µA
Variation of Black Level with Temperature ∆V/∆T – 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 matrixe d v a lu es are f ound w hen hue i s i n a n ormal c ondition and by m easuring t he r atio

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

(R – Y)
(G – Y)
(B – Y)

matrixed

matrixed

matrixed

= 1.29 (R – Y)IN – 0.29 (B – Y)

= –0.50 (R – Y)IN – 0.10 (B – Y)

= (B – Y)

IN

IN

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.
Note11. 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.

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

RGB Matrix and Amplifiers (Cont’d)

Relative Spread between the R, G, and B

Output Signals (Black–White)

Relative Black–Level Variation between the Three

Note 13 – – 20 mV

Channels During Variation of Contrast

Relative Black–Level Variation between the Three

Note 14 – – 20 mV

Channels During Variation of Brightness
Blanking Level at the RGB Outputs V
Differential Drift of the Blanking Levels Over a

blk

∆V – 0 20 mV

Temperature Range of 40°C
Tracking of Output Black Level with Supply

Voltage

DV

V

V

bl

f

x

DV

bl

F

Signal–to–Noise Ratio of Output Signals S/N Note 15 62 – – dB

– – 10 %

1.95 2.15 2.35 V

1.0 1.05 1.1

Residual 3.58MHz Signal at RGB Outputs

V

R(p–p)

– 50 75 mV

(Peak–to–Peak Value)
Residual 7.1MHz Signal at the RGB Outputs

– 50 75 mV

(Peak–to–Peak Value)
Output Impedance |Z10| – – 50 Ω

|Z11| – – 50 Ω
|Z12| – – 50 Ω

Frequency Response of Total Luminance and

α Note 16 – – –3 dB

RGB Amplifier Circuits for f = 0 to 5MHz

Sandcastle Input

Level at which the RGB Blanking is Activated V
Level at which the Burst Gate Clamping Pulses

7

V

7

1.0 1.5 2.0 V

6.5 7.0 7.5 V

are Separated
Delay between Black Level Clamping and

t

d

300 375 450 ns

Burst Gating Pulse
Input Current –I

I

7

V7 = 0 to 0.8V – – –1 mA

7

V7 = 1V to 8V – – –40 µA
V7 = 8.5V to 12V – – 2 mA

Fast Blanking

Level at which the Fast Blanking is Activated

V

11

3.5 – – V

(Pin11)
Allowable Voltage at Blanking Input V
Delay between Fast Blanking Input and Output t
Input Current I
Difference between Normal Black–Level and the

11
d

11

V11 = 3.5V – 160 – µA

– – 5 V
– 40 – ns

– –0.9 – V

Fast Blanking Black–Level

Note13. During variations of contrast (10dB) at nominal saturation.
Note14. During variations of brightness (±1V) at nominal controls.
Note 15. The signal–to–noise ratio is specified as peak–to–peak signal with respect to RMS noise.

The effective bandwidth is 5MHz.

Note16. Disconnected peaking capacitor.

Pin Connection Diagram

Supply Voltage

Peak Detector Gain Control Input

Chrominance Input

ACC Control Input

1
2
3
4
5Saturation Control Input
6Contrast Control Input
7Sandcastle Input
8Luminance Input
9Brightness Control Input 12

10Setting of Luminance Overshoot Level 11

20
19
18
17
16 Phase Detection Network
15
14
13

Bias Capacitor Input
GND

OSC Frequency Input
Hue Control Input

Control Input (DC) for Luminance Overshoot
Blue Output
Green Output
Red Output
Fast Blanking Input

20 11

.280 (7.12) Max

110

.995 (25.3) Max

.300

(7.62)

.280

(7.1)

.100 (2.54) .125 (3.17) Min .385 (9.8)