NTE NTE846 Datasheet

NTE846

Integrated Circuit

TV Video Modulator

Description:

The NTE846 is designed to interface color difference, audio, and luminance signals to the antenna
terminals of a TV receiver. It consists of a sound subcarrier oscillator, chroma subcarrier oscillator,
quatrature chroma modulators, and RF oscillators and modulators for two low–VHF channels.

The NTE846 allows video information from VTR’s test equipment, games, or similar sources to be
displayed on black and white or color TV receivers.

Features:

D DC Channel Switching
D Excellent Oscillator Stability
D 12V to 18V Supply Operation
D Low Intermodulation Products
D 5V
D May Be Used to Encode Composite Video

Chroma Reference Signal

p–p

Absolute Maximum Ratings:

Supply Voltage 19V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(V16–V15) Max ±5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(V14–V10) Max 7V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(V14–V11) Max 7V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Dissipation Package (Note 1), P

D

1390mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chroma Osc Current I17 Max 10mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Temperature Range, T
Storage Temperature Range, T

opr

stg

Lead Temperature (During Soldering, 10 seconds), T

L

0° to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

+300°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Note 1. For operation in ambient temperatures above 25°C, the device must be derated based on

a 150°C maximum junction temperature and a thermal resistance of 9 0°C/W junction to am-
bient.

DC Electrical Characteristics: (All SW Normally Pos. 1, VA = 15V, VB = 12V unless otherwise

specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Supply Current I
Sound Oscillator, Current Change ∆I
Chroma Oscillator Balance V
Chroma Modulator Balance V
R–Y Modulator Output Level ∆V

B–Y Modulator Output Level ∆V

Chroma Modulator Conversion

∆V13/∆V

Ratio

Channel A Oscillator

V8, V

“OFF” Voltage
Channel A Oscillator Curremt Level I
Channel B Oscillator

V6, V

“OFF” Voltage
Channel B Oscillator Curremt Level I
Channel A Modulator Conversion

∆V11/(V13–V12) SW 1, SW 2, SW 3: Pos. 2, VB = 12V,

Ratio

Channel B Modulator Conversion

∆V10/(V13–V12) All SW: Pos. 2, VB = 12V, Change V

Ratio

S

17
13

9

6

15

13

13

20 35 45 mA

Change VA from 12.5V to 17.5V 0.3 0.6 0.9 mA

9.5 11.0 12.5 V

7.0 7.4 7.8 V

SW 3: Pos. 2,

0.6 0.9 1.2 V

Change SW 1 from Pos. 1 to Pos. 2
SW 3: Pos. 2,

0.6 0.9 1.2 V

Change SW 2 from Pos. 1 to Pos. 2
Divide ∆V13 by ∆V3, SW 3: Pos. 2,

3

0.45 0.70 0.95 V/V

Change SW 0 from Pos. 1 to Pos. 2,

9

SW 4: Pos. 2 0.5 1.5 3.0 V

VB = 12V, VC = 13V 2.5 3.5 5.0 mA

7

SW 4: Pos. 2 0.5 1.5 3.0 V

VB = 12V, VC = 13V 2.5 3.5 5.0 mA

0.35 0.55 0.75 V/V
Change VC from 13V to 11V for ∆V11,
Divide by V13 – V

12

0.35 0.55 0.75 V/V

C

from 13V to 11V, Divide as Above

AC Electrical Characteristics: (V = 15V unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Chroma Oscillator Output Level V
Sound Carrier Oscillator Level V

17
15

Channel 3 RF Oscillator Level V8, V

Channel 4 RF Oscillator Level V6, V

C

≤ 20pF 4 5 – V

LOAD

Loaded by RC Coupling Network 2 3 4 V
Ch SW: Pos. 3, f = 61.25MHz,

9

Use FET Probe
Ch SW: Pos. 4, f = 67.25MHz,

7

Use FET Probe

200 350 – mV

200 350 – mV

P–P
P–P

P–P

P–P