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U74HCT7046 Dataheets PDF



Part Number U74HCT7046
Manufacturers Unisonic Technologies
Logo Unisonic Technologies
Description PHASE LOCKED LOOP
Datasheet U74HCT7046 DatasheetU74HCT7046 Datasheet (PDF)

UNISONIC TECHNOLOGIES CO., LTD U74HCT7046 PHASE LOCKED LOOP WITH VCO & LOCK DETECTOR CMOS IC „ DESCRIPTION The U74HCT7046 is phase-locked-loop circuit that comprise a linear voltage-controlled oscillator (VCO), two-phase comparators (PC1, PC2), a lock detector, a common signal input amplifier and a common comparator input. The lock detector capacitor should be connected between pin 15(CLD) and pin 8(GND).For a frequency range of 100kHz to 10MHz,the lock detector capacitor must be 1000pF to 10p.

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UNISONIC TECHNOLOGIES CO., LTD U74HCT7046 PHASE LOCKED LOOP WITH VCO & LOCK DETECTOR CMOS IC „ DESCRIPTION The U74HCT7046 is phase-locked-loop circuit that comprise a linear voltage-controlled oscillator (VCO), two-phase comparators (PC1, PC2), a lock detector, a common signal input amplifier and a common comparator input. The lock detector capacitor should be connected between pin 15(CLD) and pin 8(GND).For a frequency range of 100kHz to 10MHz,the lock detector capacitor must be 1000pF to 10pF,respectively. The signal can be directly coupled to large voltage signals, or with a series capacitor coupled to small signals. Small voltage signals can be kept within the linear region of the input amplifiers with a self-bias input circuit. The U74HCT7046 and a passive low-pass filter form a second-order loop PLL. With a linear op-amp, the VCO achieves excellent linearity. The VCO requires external capacitor and resistor. R1 (between R1 and GND) and capacitor C1 (between C1A and C1B) determine the frequency range of the VCO. R2 (between R2 and GND) enables the VCO to have a frequency offset if required. For the high input impedance of the VCO, the design of low-pass filters is simplified, and the designer has a wide choice of resistor/capacitor ranges. At pin 10 (DEMOUT), a demodulator output of the VCO input voltage is provided in order not to load the low-pass filter. In conventional techniques, the DEMOUT voltage is one threshold voltage lower than the VCO input voltage, but the DEMOUT voltage of U74HCT7046 equals the VCO input voltage. When DEMOUT is used, a load resistor (RS) should be connected from DEMOUT to GND; but if unused, DEMOUT should be left open. The VCO output (VCOOUT) can be connected directly or via a frequency-divider to the comparator input (COMPIN). If the VCO input is held at a constant DC level, the VCO output signal has a duty factor of 50% (maximum expected deviation 1%). A LOW level at the inhibit input (INH) enables the VCO and demodulator, while a HIGH level turns both off to minimize standby power consumption. „ FEATURES * Operating Power Supply Voltage Range: Digital Section 4.5 to 5.5 V VCO Section 4.5 to 5.5 V * Up to 18 MHz (typ.) Centre Frequency at VCC = 5V * Excellent VCO Frequency Linearity * VCO-Inhibit Control For ON/OFF Keying and for Low Standby Power Consumption * Minimal Frequency Drift * Zero Voltage Offset due to OP-Amp Buffering www.unisonic.com.tw Copyright © 2012 Unisonic Technologies Co., Ltd 1 of 16 QW-R502-851.A U74HCT7046 „ ORDERING INFORMATION Ordering Number Lead Free Halogen Free U74HCT7046L-S16-R U74HCT7046G-S16-R U74HCT7046L-S16-T U74HCT7046G-S16-T U74HCT7046L-P16-R U74HCT7046G-P16-R U74HCT7046L-P16-T U74HCT7046G-P16-T Package SOP-16 SOP-16 TSSOP-16 TSSOP-16 CMOS IC Packing Tape Reel Tube Tape Reel Tube UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 16 QW-R502-851.A U74HCT7046 „ PIN CONFIGURATION LD 1 PC1OUT 2 COMPIN 3 VCOOUT 4 INH 5 C1A 6 C1B 7 GND 8 16 VCC 15 CLD 14 SIGIN 13 PC2OUT 12 R2 11 R1 10 DEMOUT 9 VCOIN „ PIN DESCRIPTION PIN NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SYMBOL LD PC1OUT COMPIN VCOOUT INH C1A C1B GND VCOIN DEMOUT R1 R2 PC2OUT SIGIN CLD VCC FUNCTION Lock Detector Output(Active High) Phase comparator 1output Comparator input VCO output Inhibit input Capacitor C1 connection A Capacitor C1 connection B Ground(0V) VCO input Demodulator output Resistor R1 connection Resistor R2 connection Phase comparator 2 output Signal input Lock Detector Capacitor Input Positive supply voltage CMOS IC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 16 QW-R502-851.A U74HCT7046 „ LOGIC SYMBOL „ IEC SYMBOL CMOS IC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 16 QW-R502-851.A U74HCT7046 „ LOGIC DIAGRAM CMOS IC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 16 QW-R502-851.A U74HCT7046 CMOS IC „ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT DC Supply Voltage VCC -0.5 +7 V DC Input Diode Current ±IIK for VIN<−0.5V or VIN>VCC+0.5V 20 mA DC Output Diode Current DC Output Source or Sink Current ±IOK ±IO for VOUT<−0.5V or VOUT>VCC+0.5V for −0.5V


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