CD74HC4046APWR

The ’HC4046A and ’HCT4046A are high-speed silicon-gate CMOS devices that are pin compatible with the CD4046B of the “4000B” series. They are specified in compliance with JEDEC standard number 7. The ’HC4046A and ’HCT4046A are phase-locked-loop circuits that contain a linear voltage-controlled oscillator (VCO) and three different phase comparators (PC1, PC2 and PC3). A signal input and a comparator input are common to each comparator. The signal input can be directly coupled to large voltage signals, or indirectly coupled (with a series capacitor) to small voltage signals. A self-bias input circuit keeps small voltage signals within the linear region of the input amplifiers. With a passive low-pass filter, the 4046A forms a second-order loop PLL. The excellent VCO linearity is achieved by the use of linear op-amp techniques.

Applications

• FM Modulation and Demodulation
• Frequency Synthesis and Multiplication
• Frequency Discrimination
• Tone Decoding
• Data Synchronization and Conditioning
• Voltage-to-Frequency Conversion
• Motor-Speed Control

Key features

• Operating Frequency Range
• Up to 18MHz (Typ) at Vcc = 5V
• Minimum Center Frequency of 12MHz at Vcc = 4.5V
• Choice of Three Phase Comparators
• Excellent VCO Frequency Linearity
• VCO-Inhibit Control for ON/OFF Keying and for Low Standby Power Consumption
• Minimal Frequency Drift
• Fanout (Over Temperature Range)
• Standard Outputs: 10 LSTTL Loads
• Bus Driver Outputs: 15 LSTTL Loads
• Wide Operating Temperature Range: -55°C to 125°C
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
• 2V to 6V Operation
• High Noise Immunity: NIL = 30%, NIH = 30% of Vcc at Vcc = 5V
• HCT Types
• 4.5V to 5.5V Operation
• Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
• CMOS Input Compatibility, I ≤ 1μA at VOL, VOH