Overview
The CD74HC4046AMT is a high-speed CMOS logic phase-locked-loop (PLL) integrated circuit produced by Texas Instruments. It is part of the HC4046A series, which is pin compatible with the CD4046B of the '4000B' series and complies with JEDEC standard number 7. This device features a linear voltage-controlled oscillator (VCO) and three different phase comparators, making it versatile for various applications requiring frequency locking and signal processing.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | SOIC (D) | 16 pins |
| Operating Temperature Range | -55°C to 125°C | |
| Operating Frequency Range | Up to 18MHz (Typ) at VCC = 5V | |
| Minimum Center Frequency | 12MHz at VCC = 4.5V | |
| VCO Section Power Supply Voltage | 3V to 6V | |
| Digital Section Power Supply Voltage | 2V to 6V | |
| Fanout (Over Temperature Range) | Standard Outputs: 10 LSTTL Loads, Bus Driver Outputs: 15 LSTTL Loads | |
| Propagation Delay and Transition Times | Balanced | |
| Noise Immunity | NIL = 30%, NIH = 30% of VCC at VCC = 5V |
Key Features
- Choice of three phase comparators: EXCLUSIVE-OR, Edge-Triggered JK Flip-Flop, and Edge-Triggered RS Flip-Flop
- Excellent VCO frequency linearity achieved through linear op-amp techniques
- VCO-Inhibit control for ON/OFF keying and low standby power consumption
- Minimal frequency drift
- Significant power reduction compared to LSTTL logic ICs
- High noise immunity
- Wide operating temperature range: -55°C to 125°C
- CMOS input compatibility with low input current (IL ≤ 1µA at VOL, VOH)
Applications
- FM 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 CD74HC4046AMT used for?
The CD74HC4046AMT is a phase-locked-loop (PLL) integrated circuit used for applications such as FM modulation and demodulation, frequency synthesis, tone decoding, and motor-speed control.
- What is the operating frequency range of the CD74HC4046AMT?
The operating frequency range is up to 18MHz (typical) at VCC = 5V and 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 are available in the CD74HC4046AMT?
The device includes three phase comparators: EXCLUSIVE-OR, Edge-Triggered JK Flip-Flop, and Edge-Triggered RS Flip-Flop.
- How does the VCO-Inhibit control function?
The VCO-Inhibit control allows for ON/OFF keying and reduces standby power consumption.
- What is the fanout capability of the CD74HC4046AMT?
The device can drive up to 10 LSTTL loads for standard outputs and up to 15 LSTTL loads for bus driver outputs.
- What is the operating temperature range of the CD74HC4046AMT?
The operating temperature range is -55°C to 125°C.
- Is the CD74HC4046AMT sensitive to electrostatic discharge?
Yes, the device is sensitive to electrostatic discharge, and users should follow proper IC handling procedures.
- What is the significance of the self-bias input circuit in the CD74HC4046AMT?
The self-bias input circuit keeps small voltage signals within the linear region of the input amplifiers.
- Can the CD74HC4046AMT be used for motor-speed control?
Yes, it can be used for motor-speed control among other applications.
