Modulator High Frequency Characteristics

MC44BC373C/374C Technical Data

9 Modulator High Frequency Characteristics

RF inputs/outputs into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE

DEMODULATION.

Figure 3. Typical Performance

Parameter

Test Conditions

Min

Typ

Max

Unit

Type

TVOUT output level

Output signal from modulator section

See Figure 3. See Note 2

73

74.5

77

dB

µVB

UHF oscillator frequency

460

—

880

MHz

A

VHF range

From UHF oscillator internally divided

45

—

460

MHz

B

TVOUT output attenuation

During transient output inhibit, or when

ATT bit is set to 1. See Figure 3.

SeeNote2

50

60

—

dBc

B

Sound subcarrier harmonics (Fp

+n∗Fs) Reference picture carrier. See Note 2

—

63

58

dBc

C

Second harmonic of chroma subcarrier

Using red EBU bar. See Note 2

—

—

65

dBc

C

Chroma/Sound intermodulation:

Fp

+ (Fsnd – Fchr)

Using red EBU bar.See Note 2

—

—

65

dBc

C

Fo (picture carrier) harmonics

2nd harmonic: CH21

3rd harmonic: CH21

Other channels: See Figure 3.

See NOTE 1. See Note 2

—

—

35

26

30

22

dBc

C

Out band (picture carrier) spurious

1/2

∗Fo–1/4∗Fo–3/2∗Fo–3/4∗Fo

From 40MHz to 1GHz. See Note 2

—0

10

dB

µVC

In band spurious (Fo ± 5MHz)

No video sound modulation.See Note 2

—

—

60

dBc

C

Note:

1: Picture carrier harmonics are highly dependant on PCB layout and decoupling capacitors.

Note:

2: See “Characterization Measurement Conditions” on page 12.

TV Outp ut Le v e l

72

73

74

75

76

77

78

47 1 52 1 5 71 621 67 1 72 1 7 71 821 871

Fr e que nc y (M hz )

T V Ou tp u t A t te n u a t io n

45

50

55

60

65

70

75

471 521 571 621 671 721 771 821 871

Fr e q u e n c y ( M h z )

3Fo Har m o n ics

15

20

25

30

35

40

45

47 1 521 571 621 671 721 771 821 871

Fr e que nc y ( M h z )

2Fo Har m o n ics

15

20

25

30

35

40

47 1 521 571 621 671 721 771 821 871

Fr e que ncy ( M h z)

Typical

Maximum specification

Typical

Typical

Typical

Minimum specification

Maximum specification

Maximum specification

Maximum specification

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com