Overview
The CD74HC4046AM 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 control and synchronization.
Key Specifications
| Parameter | Description |
|---|---|
| Package | SOIC (D) with 16 pins |
| Operating Temperature Range | -55°C to 125°C |
| Operating Frequency Range | Up to 18MHz (Typ) at VCC = 5V, Minimum Center Frequency of 12MHz at VCC = 4.5V |
| Power Supply Voltage Range | VCO Section: 3V to 6V, Digital Section: 2V to 6V |
| Fanout | Standard Outputs: 10 LSTTL Loads, Bus Driver Outputs: 15 LSTTL Loads |
| Phase Comparators | EXCLUSIVE-OR, Edge-Triggered JK Flip-Flop, Edge-Triggered RS Flip-Flop |
| VCO Frequency Linearity | Excellent linearity achieved by linear op-amp techniques |
| VCO-Inhibit Control | For ON/OFF keying and low standby power consumption |
| Frequency Drift | Minimal frequency drift |
Key Features
- High-speed silicon-gate CMOS technology
- Choice of three phase comparators: EXCLUSIVE-OR, Edge-Triggered JK Flip-Flop, and Edge-Triggered RS Flip-Flop
- Excellent VCO frequency linearity achieved by linear op-amp techniques
- VCO-Inhibit control for ON/OFF keying and low standby power consumption
- Minimal frequency drift
- Wide operating temperature range: -55°C to 125°C
- Significant power reduction compared to LSTTL logic ICs
- High noise immunity: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V
- CMOS input compatibility, I_l ≤ 1µA at V OL, V OH
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 CD74HC4046AM used for?
The CD74HC4046AM is a phase-locked-loop (PLL) 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 CD74HC4046AM?
The operating frequency range is up to 18MHz (Typ) at VCC = 5V, with a minimum center frequency of 12MHz at VCC = 4.5V.
- What types of phase comparators are available in the CD74HC4046AM?
The device features three different phase comparators: EXCLUSIVE-OR, Edge-Triggered JK Flip-Flop, and Edge-Triggered RS Flip-Flop.
- What is the power supply voltage range for the CD74HC4046AM?
The VCO section operates from 3V to 6V, and the digital section operates from 2V to 6V.
- How does the VCO-Inhibit control function in the CD74HC4046AM?
The VCO-Inhibit control is used for ON/OFF keying and to reduce standby power consumption.
- What is the fanout capability of the CD74HC4046AM?
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 CD74HC4046AM?
The device operates over a wide temperature range from -55°C to 125°C.
- How does the CD74HC4046AM achieve excellent VCO frequency linearity?
The excellent VCO frequency linearity is achieved by the use of linear op-amp techniques.
- Is the CD74HC4046AM sensitive to electrostatic discharge?
Yes, the device is sensitive to electrostatic discharge, and users should follow proper IC handling procedures.
- What are some common applications of the CD74HC4046AM?
Common applications include FM modulation and demodulation, frequency synthesis, tone decoding, data synchronization, voltage-to-frequency conversion, and motor-speed control.
