Sharp VT4T5UF2021 Datasheet
VT4T5UF2021
COMB4-1
RF Data Sheet
Combination Tuner/Demodulator/Modul ator
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: Dum my 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
FUNCTIONAL DESCRIPTION
The VT4T5UF2021 is a combination tuner, demodulator and modulator in one package. This unit is compatible with North Am erican NTSC televisi on broadcast
signals. An internal Phase-Locked Loop circuit performs 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 purposes. The modulator has s eparate video and audio
inputs and control connections. This single package
configuration is useful when there is no need to manipulate the AGC or IF signals prior to demodulation, and
provides for a simplified system design. The RF connectors are mounted on the end of the housing so thatthe 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. Outp ut 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 functions to be used at all times, regardless of the condition
of the RF pass-through and the modulator outpu t.
Demodulated au dio, video AGC and AFT outputs a re
also provided. The AGC control line from the demodulator to the tuner is not accessib le to the system desig ner.
RF Data Sheet 1
VT4T5UF2021 Combination Tuner/Demodulator/Modulator
ANT
IN
VIDEO
IN
AUDIO
IN
U/V SEPARATE
FILTER
DISTRIBUTOR
VIDEO
CLAMPER
SAW
RESONATOR
PRE-EMPHASIS
UHF
CIRCUIT
VHF
CIRCUIT
INPUT
TUNING
INPUT
TUNING
WHITE
CLIPPER
CH.
SW
AMP
RF
AMP
RF
AMP
MODULATOR
RF
CARRIER
OSC
FM
MODULATOR
4.5 MHz
TANK
INTERSTAGE
TUNING
CIRCUIT
INTERSTAGE
TUNING
CIRCUIT
HPFRF SW
RF SW
BPF
U/V ONE CHIP AND IC
MIX
OSC
~
IF
AMP
OSC
~
TV OUT
RESONANCE
CIRCUIT
IF TUNING
CIRCUIT
RESONANCE
CIRCUIT
PRE-AMP
PLL CIRCUIT
SIF
TRAP
SIF
FILTER
SAW
FILTER
DET
OUT
RF AGC
SF IN
DEMODULATOR
IC
Figure 1. VT4T5UF2021 Block Diagram
VIDEO AMP
VIDEO OUT
AUDIO OUT
AFT OUT
AFT MUTE
COMB3-6
2 RF Data Sheet
Combination Tuner/Demodulator/Modulator VT4T5UF2021
XΣxi n
⁄
=
S
Σ
Xi x
–
()
2
n2
–
()⁄
n10*=,=
(Tested channels including worst)
XΣxi n
⁄
=
XΣxi n
⁄
=
S
Σ
Xi x
–
()
2
n2
–
()⁄
n10*=,=
(Tested channels including worst)
ELECTRICAL CHARACTERISTICS
• Nominal Supply Voltage (TYP.)
–BM: 5 V
– BT: 33 V
–BP: 5 V
– B: 5 V
• Operating Voltage (TYP.)
– BM: 5V ±0.2 V
– BT: 33 V ±2.0 V
– BP: 5 V ±0.5 V
– B: 5 V ±0.5 V
– Control: 5 V ±0.2 V
• Breakdown Voltage (MIN.)
– BM: 5.5 V
– BT: 34 V
–BP: 5.5 V
– B: 5.5 V
• Test Conditions (TYP.)
–BM: 5 V
– BT: 33 V
–BP: 5 V
– B: 5 V
– Ambient Temperature 25°C ±5°C
– Relative Humidity 65% ±10%
• Current Consumption (MAX.)
– BM: 1.0 mA
–BT: 5 mA
– BP: 70 mA
– B: 40 mA
• Temperature (TYP.)
– Storage -20°C to +70°C
– Operating -10°C to +60°C
• RF Output (Video Sys tem). Measured by standard
demodulator input 1 Vp-p.
– Modulation Factor 80% (TYP.), 80 ±5%
– Differential Gain 2% (TYP.), 7% (MAX.)
– Differential Phase 1.5° (TYP.), 8° (MAX.)
– S/N Ratio 55 dB (TYP.), 48 dB (MIN.)
– Frequency Characteristics 0 dB (TYP.), 0 ±3 dB
– Change in Modulation Factor to APL 1% ( TYP.),
5% (MAX.)
• RF Output (Audio Sys tem). Measured by standard
demodulator input 1 kHz, 1.24 Vp-p sincurve.
– Modulation Factor ±22.5 kHz (TYP.),
±22.5 kHz - ±5.5 kHz
– Distortion Rate 0.3% (TYP.), 1% (MAX.)
– S/N Ratio 56 dB (TYP.), 48 dB (MIN.)
– Frequency Characteristics 0 dB (TYP.), 0 ±3 dB
• RF Output (Output System). Measured sync level at
whilte 100% signal, input 1 Vp-p.
– Video Carrier Center Frequency Accuracy
±10 kHz (TYP.), ±100 kHz (MAX.)
– Sound Carrier Center Frequency Accuracy
4.5 MHz (TYP.), 4.5 MHz ±7 kHz
– Video Carrier Output Level 66 dBµ (TYP.),
66 ±3 dBµ
– P/S Ratio 16 dB (TYP.), 16 ±3 dB
• RF Output Spurious.
– Specific Frequency 70 dB (TYP.), 60 dB (MIN.)
– fp to fp + 4.5 MHz
– Other Frequencies 50 dB (TYP.), 30 dB (MIN.)
– 0 to 1 GHz (except fp ±4.6 MHz)
•RF Switch
– Insertion Loss: 55 to 806 MHz
– 4.0 dB (TYP.), 8.0 dB (MAX.)
– Isolation: 61 to 72 MHz
– 70 dB (TYP.), 60 dB (MIN.)
– Return Loss: 61 to 72 MHz
– 8.0 dB (TYP.), 4.0 dB (MIN.)
• RF Switch Operation (dBµ)
– Terminal Number 4: RF OUT ← RF IN (TYP.)
–+5 V:OFF
– Open: ON
• Antenna Terminal Voltage
– Modulator OSC Leakage 9.5 dBµ (MAX.)
– Tuner OSC Leakage
– Fundamental Wave 60 dBµ (MAX.)
– Higher Harmonic 60 dBµ (MAX.)
• Noise Figure (UHF AIR)
– Maximum 11 dB (TYP.), 16 dB (MAX.)
–
– Shall satisfy the requirements stated in FCC
NF Sampling Plan C (effective January, 1980)
– Noise figure measur ement shall be based on
FCC OST 50 (effective January, 1980)
– XIRS 11 dB (TYP.), 16 dB (MAX.)
–
– Noise figure measur ement shall be based on
FCC OST 50 (effective January, 1980)
*A representative tuner test shall be conducted on the follow-
NOTE:
ing channels and on the worst channel found CH 14 through CH69:
Ch14, 20, 26, 32, 38, 44, 50, 56, 62, and 69.
RF Data Sheet 3
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