U74HC4046A Datasheet PDF - Unisonic Technologies
Part Number | U74HC4046A | |
Description | PHASE LOCKED LOOP | |
Manufacturers | Unisonic Technologies | |
Logo | ||
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U74HC4046A
PHASE LOCKED LOOP WITH VCO
CMOS IC
DESCRIPTION
The U74HC4046A is a phase-locked-loop circuit including a linear
voltage-controlled oscillator (VCO), three different phase comparators
(PC1, PC2 and PC3), a common signal input amplifier and a common
SOP-16
comparator input.
The signal can be directly coupled to large voltage signals or with a
series capacitor coupled to small voltage signals. Small voltage signals
can be kept within the linear region of the input amplifiers with a self-bias
input circuit. The U74HC4046A 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 an external capacitor and resistor. R1 (between R1
TSSOP-16
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 U74HC4046 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
* Low Power Consumption
* Operating Power Supply Voltage Range: Digital Section 2.0 to 6.0 V
VCO Section 3.0 to 6.0 V
* Up to 17 MHz (typ.) Centre Frequency at VCC = 4.5 V
* Excellent VCO Frequency Linearity
* VCO-Inhibit Control For ON/OFF Keying and for Low Standby Power Consumption
* Minimal Frequency Drift
* Three Phase Comparators: EXCLUSIVE-OR;
Edge-Triggered JK Flip-Flop;
Edge-Triggered RS Flip-Flop
* Zero Voltage Offset due to OP-Amp Buffering
* Standard Output Capability
* MSI ICC Category
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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U74HC4046A
FUNCTIONAL DIAGRAM
CMOS IC
LOGIC DIAGRAM
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-461.C
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for U74HC4046A electronic component. |
Information | Total 19 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ U74HC4046A.PDF Datasheet ] |
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