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Integrated Circuit 74hc4046ad of Phase-Locked-Loop IC with Vco

Name: Integrated Circuit 74hc4046ad of Phase-Locked-Loop IC with Vco
Brand: all-electronics-online.com
SKU: 796953285
Availability: InStock
Rating: 4.7 (112 reviews)

Price:	US $ 0.59/Piece
Min Order:	50/Piece
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Prod Model:	74HC4046AD

Product Description

Lead time	2 to 3 days after receiving the payment.
Remark	100% New and original ; 30 days warranty
Payment	Heng Seng Bank (Hong Kong), Paypal,
Shipment	DHL ,TNT ,FEDEX, UPS or any other express

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
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
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
via a frequency-divider. The VCO output signal has a duty
factor of 50% (maximum expected deviation 1%), if the
VCO input is held at a constant DC level. 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.
The only difference between the HC and HCT versions is
the input level specification of the INH input. This input
disables the VCO section. The sections of the comparator
are identical, so that there is no difference in the
SIGIN (pin 14) or COMPIN (pin 3) inputs between the HC
and HCT versions.

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