CD74HCT4046A - High Speed CMOS Logic Phase-Locked-Loop with VCO

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.

• Operating Frequency Range
  • Up to 18MHz (Typ) at V_CC = 5V
  • Minimum Center Frequency of 12MHz at V_CC = 4.5V
• Choice of Three Phase Comparators
  • EXCLUSIVE-OR
  • Edge-Triggered JK Flip-Flop
  • Edge-Triggered RS Flip-Flop
• Excellent VCO Frequency Linearity
• VCO-Inhibit Control for ON/OFF Keying and for Low Standby Power Consumption
• Minimal Frequency Drift
• Operating Power Supply Voltage Range
  • VCO Section . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 6V
  • Digital Section . . . . . . . . . . . . . . . . . . . . . . . . 2V to 6V
• 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: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V
• HCT Types
  • 4.5V to 5.5V Operation
  • Direct LSTTL Input Logic Compatibility, V_IL = 0.8V (Max), V_IH = 2V (Min)
  • CMOS Input Compatibility, I_l ≤ 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