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Número de pieza

componentes Descripción

Fabricante

NTE821

Integrated Circuit TV Chroma Demodulator

NTE Electronics 

Electrical Characteristics: (TA = +25°C, VCC = 24V, RL = 3.3kΩ, Reference Input Voltage = 1VP–P

unless otherwise specified)

Parameter

Test Pin

Test Conditions

Min Typ Max Unit

Static Characteristics

Quiescent Output Voltage

9, 11, 13

13.0 14.3 16.0 V

Quiescent Input Current

8

RL = ∞, Chroma and Reference

Voltage = 0

– 6.0 – mA

Chroma and Reference Voltage = 0

16.5 19.0 25.5 mA

Reference Input Voltage

6, 7

– 6.6 –

V

Chroma Input Voltage

3, 4

– 3.5 –

V

Differential Output Voltage

9, 11, 13 Note 3

– 200 600 mV

Output Temperature Coefficient

9, 11, 13 No Output Differential Voltage, Note 3

– 2.0 – mV/°C

Dynamic Characteristics

Detector Output Voltage (B–Y)

13 Note 4

8 13 – VP–P

Chroma Input Voltage

3

B–Y Output = 5VP–P, Note 5

– 300 700 mVP–P

Detector Output Voltage (G–Y)

9

Adjust B–Y Output to 5VP–P, Note 6

1.4 1.75 2.1 VP–P

Detector Output Voltage (R–Y)

11 Adjust B–Y Output to 5VP–P, Note 6

4.3 4.65 5.0 VP–P

Relative Output Phase (B–Y to R–Y) 13–11 B–Y Output = 5VP–P

85 90 95 deg

Relative Output Phase (B–Y to G–Y) 13–9 B–Y Output = 5VP–P

236 244 252 deg

Demodulator Unbalanced Voltage 9, 11, 13 No Chroma Input Voltage and Normal – 250 500 mVP–P

Reference Signal Input Voltage

Residual Carrier and Harmonics

Reference Input Resistance

9, 11, 13 With Input Signal Voltage, Normal Refer- –

ence Signal Voltage and B–Y = 5VP–P

6, 7 Chroma Input = 0

–

– 1.5 VP–P

2.0 – kΩ

Reference Input Capacitance

6, 7 Chroma Input = 0

– 6.0 – pF

Chroma Input Resistance

3, 4

– 1.0 – kΩ

Chroma Input Capacitance

3, 4

– 2.0 – pF

Note 3. With chroma input signal voltage = 0 and normal reference input signal voltage (1VP–P), all

output voltages will be within specified limits and will not differ from each other by greater

than 0.6V.

Note 4. With normal reference input signal voltage, adjust chroma input signal voltage to 1.2VP–P.

Note 5. With normal reference input signal voltage, adjust chroma input signal voltage until the B–Y

output voltage = 5VP–P. The chroma input voltage at this point should be equal to or less than

0.7VP–P.

Note 6. With normal reference input signal voltage, adjust the chroma input signal until the B–Y out-

put voltage = 5VP–P. At this point, the R–Y and G–Y voltages will fall within the specified limits.

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