MC44BC374T1 View Datasheet(PDF) - Motorola => Freescale
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MC44BC374T1 Datasheet PDF : 27 Pages
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Modulator High Frequency Characteristics
9 Modulator High Frequency Characteristics
Unless otherwise stated: Vcc=5.0V, Ambient Temperture=25oC, Video Input 1Vp-p, 10-step grayscale.
RF inputs/outputs into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE
DEMODULATION.
Parameter
Test Conditions
Min Typ Max Unit Type
TVOUT output level
UHF oscillator frequency
Output signal from modulator section
See Figure 3. See Note 2
73 74.5 77 dBµV B
460 — 880 MHz A
VHF range
From UHF oscillator internally divided 45
TVOUT output attenuation
During transient output inhibit, or when
ATT bit is set to 1. See Figure 3.
50
See Note 2
Sound subcarrier harmonics (Fp+n∗Fs) Reference picture carrier. See Note 2 —
Second harmonic of chroma subcarrier Using red EBU bar. See Note 2
—
Chroma/Sound intermodulation:
Fp+ (Fsnd – Fchr)
Using red EBU bar.See Note 2
—
Fo (picture carrier) harmonics
2nd harmonic: CH21
3rd harmonic: CH21
Other channels: See Figure 3.
—
—
See NOTE 1. See Note 2
Out band (picture carrier) spurious
1 / 2 ∗ Fo – 1 / 4 ∗ Fo – 3 / 2 ∗ Fo – 3 / 4 ∗ Fo
From 40MHz to 1GHz. See Note 2
—
In band spurious (Fo ± 5MHz)
No video sound modulation.See Note 2 —
— 460 MHz B
60 — dBc B
63 58 dBc C
— 65 dBc C
— 65 dBc C
35
26
30
22
dBc
C
0 10 dBµV C
— 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 11.
2Fo Har m o n ics
40
35
30
Typical
25
20
Minimum specification
15
471 521 571 621 671 721 771 821 871
Fr e que ncy (M hz )
TV Output Le ve l
78
77
76 Maximum specification
75
74
Typical
73
72
Minimum specification
471 521 571 621 671 721 771 821 871
Fr e que ncy (M hz)
3Fo Har m o n ics
45
40
Typical
35
30
25
20
Minimum specification
15
471 521 571 621 671 721 771 821 871
Fr e que ncy (M hz )
TV Outpu t Atte n uatio n
75
70
65
60
Typical
55
50
45
Minimum specification
471 521 571 621 671 721 771 821 871
Fr e qu e ncy (M hz )
Figure 3. Typical Performance
8
MC44BC374T1 Technical Data
MOTOROLA
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