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PDF VT4T5UF2021 Data sheet ( Hoja de datos )
| Número de pieza | VT4T5UF2021 | |
| Descripción | Combination Tuner/Demodulator/Modulator | |
| Fabricantes | Sharp Electrionic Components | |
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RF Data Sheet
VT4T5UF2021
Combination Tuner/Demodulator/Modulator
FEATURES
• Receiving Standard: USA
• Receiving Channels:
– VHF Section
– Low Band – Air: 2 to 6 CATV: (A-8) A-5 to B
– High Band – Air: 7 to 13 CATV: C to W + 11
– UHF Section
– Air: 14 to 69
– CATV: W + 12 to W + 84
• Sending Channels:
– USA Channel 3 and 4
– CH 3: OPEN
– CH 4: GND
• Receiving and Sending System: USA Standard
M-System (NTSC)
• Channel Selection System: PLL Tuning
• Detection System: Dummy Synchronization Detec-
tion System, Intercarrier Sound Receiving System
• Nominal Input Impedance:
– RF: 75 Ω, Unbalanced
– Video: 1 kΩ, Unbalanced
– Audio: 4.7 Ω MIN., Unbalanced
– Control: 30 kΩ MIN., Unbalanced
• Output Load Impedance:
– RF: 75 Ω
– Video: 1 kΩ
– Audio: 4.7 kΩ
• Intermediate Frequency:
– Picture: 45.75 MHz
– Sound: 41.25 MHz
• Weight: 72 g ±10 g
• Applicable Standards:
– EIA Standard Number 544
– EIA Standard Number 16A
– FCC Standards
– UL Standard
COMB4-1
FUNCTIONAL DESCRIPTION
The VT4T5UF2021 is a combination tuner, demodu-
lator and modulator in one package. This unit is compat-
ible with North American NTSC television broadcast
signals. An internal Phase-Locked Loop circuit per-
forms all of the required tuning functions. Digital control
information is provided to the unit on I2C serial data
bus. The tuner and demodulator blocks are internally
connected, providing an IF sample point for test pur-
poses. The modulator has separate video and audio
inputs and control connections. This single package
configuration is useful when there is no need to manip-
ulate the AGC or IF signals prior to demodulation, and
provides for a simplified system design. The RF con-
nectors are mounted on the end of the housing so that-
the smallest possible area is used on the rear panel of
the end product.
The RF pass-through feature is electrically controlled
via an external interface pin. Output channel 3 or 4 is
also electrically selected by asserting 5 V or ground on
an external pin. The internal tuner sample point is
always active, allowing the tuner and demodulator func-
tions to be used at all times, regardless of the condition
of the RF pass-through and the modulator output.
Demodulated audio, video AGC and AFT outputs are
also provided. The AGC control line from the demodula-
tor to the tuner is not accessible to the system designer.
RF Data Sheet
1
1 page  
Combination Tuner/Demodulator/Modulator
VT4T5UF2021
105
95
85
75
65
50
60 70 80 90 100
UNDESIRED INPUT LEVEL (dBµ)
110
NOTE: Input levels causing 1% cross modulation are shown in shaded area.
Figure 3. Cross Modulation Between Next and Adjacent Channels
105
95
85
75
65
50 60 70 80 90 100
UNDESIRED INPUT LEVEL (dBµ)
NOTE: Input levels causing 1% cross modulation are shown in shaded area.
110
Figure 4. Cross Modulation Between Adjacent Channels
tRISE tSUEN
ENABLE
tSUDA tHDDA
DATA
tHIEL
CLOCK
tLOEL
tRATE
tFALL
90%
10%
tHDEN
90%
10%
90%
10%
Figure 5. PLL AC Characteristics
RF Data Sheet
COMB3-2
COMB3-3
COMB3-5
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet VT4T5UF2021.PDF ] | |
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