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SN74LV4046ANE4 Datasheet(PDF) 10 Page - Texas Instruments |
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SN74LV4046ANE4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page Voltage Controlled Oscillator Phase Comparator 1 Phase Comparator 2 Phase Comparator 3 3 COMPIN SIGIN 14 2 PC1OUT PCPOUT 1 5 INH VCOOUT 4 7 C1B C1A 6 9 VCOIN GND 8 11 R1 DEMOUT 10 13 PC2OUT R2 12 15 PC3OUT VCC 16 SN74LV4046A SCES656D – FEBRUARY 2006 – REVISED SEPTEMBER 2015 www.ti.com 7 Detailed Description 7.1 Overview The SN74LV4046A is a high-speed silicon-gate CMOS device that is pin compatible with the CD4046B and the CD74HC4046. The device is specified in compliance with JEDEC Std 7. The SN74LV4046A is a phase-locked loop (PLL) circuit that contains a linear voltage-controlled oscillator (VCO) and three different phase comparators (PC1, PC2, and PC3) as explained in the Features section. A signal input and a comparator input are common to each comparator as shown in the Functional Block Diagram. 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 lowpass filter, the SN74LV4046A forms a second-order loop PLL. The excellent VCO linearity is achieved by the use of linear operational amplifier techniques. Various applications include telecommunications, Digital Phase Locked Loop and Signal generators. 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 lowpass filters by giving the designer a wide choice of resistor or capacitor ranges. In order not to load the lowpass filter, a demodulator output of the VCO input voltage is 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 the VCO input. If DEMOUT is used, a load resistor (RS) should be connected from DEMOUT to GND; if unused, DEMOUT should be left open. The VCO output (VCOOUT) can be connected directly to the comparator input (COMPIN), or connected through a frequency divider. The VCO output signal has a specified duty factor of 50%. 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. 7.2 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: SN74LV4046A |
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