Overview
The CD74HC4046AE is a high-speed CMOS logic phase-locked loop (PLL) with a voltage-controlled oscillator (VCO) produced by Texas Instruments. This device is part of the 74HC series and is known for its high performance and versatility in various applications. The CD74HC4046AE is pin compatible with the CD4046B of the “4000B” series and complies with JEDEC standard number 7. It features three different phase comparators and a linear VCO, making it suitable for a wide range of signal processing and synchronization tasks.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Operating Frequency Range | Up to 18MHz at VCC = 5V | Hz |
| Minimum Center Frequency | 12MHz at VCC = 4.5V | Hz |
| Operating Power Supply Voltage Range - VCO Section | 3V to 6V | V |
| Operating Power Supply Voltage Range - Digital Section | 2V to 6V | V |
| Temperature Range | -55°C to 125°C | °C |
| Package Type | 16 Ld PDIP | |
| Input Voltage (High Level) | 2.1V to 4.2V (depending on VCC) | V |
| Input Voltage (Low Level) | 0.9V to 1.8V (depending on VCC) | V |
| Output Voltage (High Level) - CMOS Loads | 2.9V to 5.9V (depending on VCC) | V |
| Output Voltage (Low Level) - CMOS Loads | 0.1V | V |
Key Features
- Three phase comparators: EXCLUSIVE-OR, edge-triggered JK flip-flop, and edge-triggered RS flip-flop.
- Linear voltage-controlled oscillator (VCO) with excellent frequency linearity.
- VCO-inhibit control for ON/OFF keying and low standby power consumption.
- Minimal frequency drift.
- Self-bias input circuit for handling small voltage signals.
- Demodulator output for VCO input voltage.
- High input impedance simplifies low-pass filter design.
Applications
- Tone decoding and data synchronization.
- Motor-speed control.
- Voltage-to-frequency conversion.
- Phase-locked loop circuits for signal processing and synchronization.
- Low-power communication systems requiring ON/OFF keying.
Q & A
- What is the CD74HC4046AE? The CD74HC4046AE is a high-speed CMOS logic phase-locked loop (PLL) with a voltage-controlled oscillator (VCO) produced by Texas Instruments.
- What are the operating frequency ranges of the CD74HC4046AE? The device operates up to 18MHz at VCC = 5V and has a minimum center frequency of 12MHz at VCC = 4.5V.
- What are the power supply voltage ranges for the VCO and digital sections? The VCO section operates from 3V to 6V, and the digital section operates from 2V to 6V.
- What types of phase comparators does the CD74HC4046AE have? The device includes EXCLUSIVE-OR, edge-triggered JK flip-flop, and edge-triggered RS flip-flop phase comparators.
- How does the VCO-inhibit control function? The VCO-inhibit control allows for ON/OFF keying and reduces standby power consumption.
- What is the temperature range of the CD74HC4046AE? The device operates from -55°C to 125°C.
- What package types are available for the CD74HC4046AE? The device is available in a 16 Ld PDIP package among others.
- How does the self-bias input circuit work? The self-bias input circuit keeps small voltage signals within the linear region of the input amplifiers.
- What is the purpose of the demodulator output? The demodulator output provides the VCO input voltage, which can be used in the design of low-pass filters.
- What are some common applications of the CD74HC4046AE? Common applications include tone decoding, data synchronization, motor-speed control, voltage-to-frequency conversion, and phase-locked loop circuits.
