CD74HCT7046AMG4

带有VCO及锁定检测锁相环 Phase-Locked Loop with VCO and Lock Detector

Description

The CD74HC7046A and CD74HCT7046A high-speed silicon-gate CMOS devices, specified in compliance with JEDEC Standard No. 7A, are phase-locked-loop PLL circuits that contain a linear voltage-controlled oscillator VCO, two-phase comparators PC1, PC2, and a lock detector. A signal input and a comparator input are common to each comparator. The lock detector gives a HIGH level at pin 1 LD when the PLL is locked. The lock detector capacitor must be connected between pin 15 CLD and pin 8 Gnd. For a frequency range of 100kHz to 10MHz, the lock detector capacitor should be 1000pF to 10pF, respectively.

Features

• Center Frequency of 18MHz Typ at VCC = 5V, Minimum Center Frequency of 12MHz at VCC = 4.5V

• Choice of Two Phase Comparators

   - Exclusive-OR

   - Edge-Triggered JK Flip-Flop

• 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 Buffer

• Operating Power-Supply Voltage Range

   - VCO Section . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 6V

   - Digital Section . . . . . . . . . . . . . . . . . . . . . . . . 2V to 6V

• Fanout Over Temperature Range

   - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

   - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55oC to 125oC

• Balanced Propagation Delay and Transition Times

• Significant Power Reduction Compared to LSTTL Logic ICs

• HC Types

   - 2V to 6V Operation

   - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V

• HCT Types

   - 4.5V to 5.5V Operation

   - Direct LSTTL Input Logic Compatibility, VIL= 0.8V Max, VIH = 2V Min

   - CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH

Applications

• FM Modulation and Demodulation

• Frequency Synthesis and Multiplication

• Frequency Discrimination

• Tone Decoding

• Data Synchronization and Conditioning

• Voltage-to-Frequency Conversion

• Motor-Speed Control

• Related Literature

   - AN8823, CMOS Phase-Locked-Loop Application Using the CD74HC/HCT7046A and CD74HC/HCT7046A