Sharp VT4T5UF2021 Datasheet

VT4T5UF2021

RF Data Sheet 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 Detection 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, demodulator and modulator in one package. This unit is compatible with North American NTSC television 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 separate 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. 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 functions 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 demodulator to the tuner is not accessible to the system designer.

RF Data Sheet

1

VT4T5UF2021						Combination Tuner/Demodulator/Modulator
ANT					RF SW			HPF	TV OUT
IN
	DISTRIBUTOR
						RF SW
VIDEO	VIDEO		WHITE		MODULATOR		BPF
IN	CLAMPER	CLIPPER
			CH.
	SAW		SW		RF
				CARRIER
	RESONATOR
					OSC
AUDIO			AMP		FM
	PRE-EMPHASIS
IN				MODULATOR
					4.5 MHz
					TANK
	UHF			RF		U/V ONE CHIP AND IC
	INPUT			AMP	INTERSTAGE	MIX	OSC	~	RESONANCE
	TUNING				TUNING				CIRCUIT
	CIRCUIT				CIRCUIT
							IF
U/V SEPARATE							AMP		IF TUNING
FILTER									CIRCUIT
	VHF			RF
	INPUT			AMP	INTERSTAGE		OSC	~	RESONANCE
	TUNING				TUNING
									CIRCUIT
	CIRCUIT				CIRCUIT
							PLL CIRCUIT
						SIF		VIDEO AMP
						TRAP			VIDEO OUT
					SIF
					FILTER
	PRE-AMP			DET
	SAW			OUT		SF IN
	FILTER								AUDIO OUT
					DEMODULATOR
					IC				AFT OUT
									AFT MUTE
			RF AGC
									COMB3-6

Figure 1. VT4T5UF2021 Block Diagram

2	RF Data Sheet

Combination Tuner/Demodulator/Modulator

VT4T5UF2021

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 System). 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 System). 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.)

X = Σxi ⁄ n

S= Σ(Xi – x)2 ⁄ (n – 2), n = 10* (Tested channels including worst)

–Shall satisfy the requirements stated in FCC NF Sampling Plan C (effective January, 1980)

–Noise figure measurement shall be based on FCC OST 50 (effective January, 1980)

–XIRS 11 dB (TYP.), 16 dB (MAX.)

X = Σxi ⁄ n

S= Σ(Xi – x)2 ⁄ (n – 2), n = 10*

(Tested channels including worst)

–Noise figure measurement shall be based on FCC OST 50 (effective January, 1980)

NOTE: *A representative tuner test shall be conducted on the following 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

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