Overview
The MC74HC4046B is a high-performance silicon-gate CMOS phase-locked loop (PLL) device produced by onsemi. It is similar in function to the MC14046 Metal gate CMOS device and is designed to be compatible with standard CMOS outputs and LSTTL outputs with pull-up resistors. The device includes three phase comparators, a voltage-controlled oscillator (VCO), and a unity gain op-amp.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC (DC Supply Voltage) | 3.0 | 6.0 | V |
| Vin (DC Input Voltage) | –1.5 | VCC + 1.5 | V |
| Vout (DC Output Voltage) | –0.5 | VCC + 0.5 | V |
| Iin (DC Input Current per Pin) | ±20 | mA | |
| Iout (DC Output Current per Pin) | ±25 | mA | |
| ICC (DC Supply Current, VCO disabled) | 80 | μA | |
| TA (Operating Temperature) | –55 | 125 | °C |
| tPLH, tPHL (Propagation Delay, SIGIN/COMPIN to PC1OUT) | 30 | 265 | ns |
| fo (VCO Center Frequency) | 3 | 13 | MHz |
Key Features
- Output Drive Capability: 10 LSTTL Loads
- Low Power Consumption Characteristic of CMOS Devices
- Operating Speeds Similar to LSTTL
- Wide Operating Voltage Range for VCO: 3.0 to 6.0 V
- Low Input Current: 1.0 μA Maximum (except SIGIN and COMPIN)
- In Compliance with the Requirements Defined by JEDEC Standard No. 7 A
- Low Quiescent Current: 80 μA Maximum (VCO disabled)
- High Noise Immunity Characteristic of CMOS Devices
- Diode Protection on All Inputs
- AEC-Q100 Qualified and PPAP Capable for Automotive and Other Applications
- Pb-Free, Halogen Free, and RoHS Compliant
Applications
- FM and FSK Modulation and Demodulation
- Frequency Synthesis and Multiplication
- Frequency Discrimination
- Tone Decoding
- Data Synchronization and Conditioning
- Voltage-to-Frequency Conversion
- Motor Speed Control
Q & A
- What is the MC74HC4046B?
The MC74HC4046B is a high-performance silicon-gate CMOS phase-locked loop (PLL) device.
- What are the key components of the MC74HC4046B?
The device includes three phase comparators, a voltage-controlled oscillator (VCO), and a unity gain op-amp.
- What is the operating voltage range for the VCO?
The operating voltage range for the VCO is 3.0 to 6.0 V.
- What is the maximum quiescent current when the VCO is disabled?
The maximum quiescent current when the VCO is disabled is 80 μA.
- Is the MC74HC4046B compatible with LSTTL outputs?
Yes, the device inputs are compatible with standard CMOS outputs and LSTTL outputs with pull-up resistors.
- What are some common applications of the MC74HC4046B?
Applications include FM and FSK modulation and demodulation, frequency synthesis and multiplication, frequency discrimination, tone decoding, data synchronization and conditioning, voltage-to-frequency conversion, and motor speed control.
- How does the inhibit input function?
A logic high on the inhibit input disables the VCO and all op-amps, minimizing standby power consumption.
- What is the purpose of the unity gain op-amp in the MC74HC4046B?
The unity gain op-amp provides a buffered output of the VCO input voltage, allowing access to the signal without loading the loop filter.
- Is the MC74HC4046B RoHS compliant?
Yes, the device is Pb-Free, Halogen Free, and RoHS Compliant.
- What is the maximum propagation delay from SIGIN/COMPIN to PC1OUT?
The maximum propagation delay from SIGIN/COMPIN to PC1OUT is 265 ns.
