Datasheet NXP 74HC4046AD — Даташит

INTEGRATED CIRCUITS DATA SHEET
For a complete data sheet, please also download: The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Information The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT4046A Phase-locked-loop with VCO
Product specification Supersedes data of September 1993 File under Integrated Circuits, IC06 1997 Nov 25 Philips Semiconductors Product specification Phase-locked-loop with VCO
FEATURES Low power consumption Centre frequency of up to 17 MHz (typ.) at VCC = 4.5 V Choice of three phase comparators: EXCLUSIVE-OR; edge-triggered JK flip-flop; edge-triggered RS flip-flop Excellent VCO frequency linearity VCO-inhibit control for ON/OFF keying and for low standby power consumption Minimal frequency drift Operating power supply voltage range: VCO section 3.0 to 6.0 V digital section 2.0 to 6.0 V Zero voltage offset due to op-amp buffering Output capability: standard ICC category: MSI. GENERAL DESCRIPTION Phase comparators The 74HC/HCT4046A are high-speed Si-gate CMOS devices and are pin compatible with the "4046" of the "4000B" series. They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT4046A are phase-locked-loop circuits that comprise a linear voltage-controlled oscillator (VCO) and three different phase comparators (PC1, PC2 and PC3) with a common signal input amplifier and a common comparator input. The signal input can be directly coupled to large voltage signals, or indirectly coupled (with a series capacitor) to small voltage signals. A self-bias input circuit keeps small voltage signals within the linear region of the input amplifiers. With a passive low-pass filter, the "4046A" forms a second-order loop PLL. The excellent VCO linearity is achieved by the use of linear op-amp techniques. The VCO requires one external capacitor C1 (between C1A and C1B) and one external resistor R1 (between R1 and GND) or two external resistors R1 and R2 (between R1 and GND, and R2 and GND). Resistor R1 and capacitor C1 determine the frequency range of the VCO. Resistor R2 enables the VCO to have a frequency offset if required. The high input impedance of the VCO simplifies the design of low-pass filters by giving the designer a wide choice of resistor/capacitor ranges. In order not to load the low-pass filter, a demodulator output of the VCO input voltage is 1997 Nov 25 2 74HC/HCT4046A
provided at pin 10 (DEMOUT). In contrast to conventional techniques where the DEMOUT voltage is one threshold voltage lower than the VCO input voltage, here the DEMOUT voltage equals that of t …