CD4046BCM

Overview

The CD4046BCM is a micropower phase-locked loop (PLL) integrated circuit manufactured by Fairchild Semiconductor, housed in a 16-lead Small Outline Integrated Circuit (SOIC) package. It integrates a linear voltage-controlled oscillator (VCO), two phase comparators, a source follower, and a zener diode. The device operates within a supply voltage range of 3.0V to 18V. At a center frequency of 10 kHz with a 5V supply, the typical dynamic power consumption is 70 µW. The VCO achieves a typical maximum frequency of 1.3 MHz at 10V, with high linearity of 1% and low frequency drift of 0.06%/°C.

Feature Summary

• Micropower operation with 70 µW typical consumption at fo = 10 kHz, VDD = 5V
• Wide supply voltage range from 3.0V to 18V
• Integrated linear VCO with 1.3 MHz typical frequency at 10V supply
• Two phase comparators: Phase Comparator I (XOR gate) and Phase Comparator II (edge-controlled digital memory network)
• Built-in zener diode for power supply regulation

Applications

• FM demodulator and modulator
• Frequency synthesis and multiplication
• Data synchronization and conditioning
• Motor speed control
• Tone decoding

Procurement Notes

Verify that the component is the CD4046BCM variant specifically, which denotes the SOIC-16 package. Confirm the manufacturer is Fairchild Semiconductor or an authorized successor entity. Ensure the datasheet revision matches DS005968. Check for RoHS compliance status if required by specific manufacturing standards.

Selection Notes

Select this component when a low-power CMOS PLL is required for frequencies up to approximately 1.3 MHz. Use Phase Comparator I for applications requiring harmonic locking or simple square wave inputs. Choose Phase Comparator II for wider capture ranges and zero-degree phase shift requirements. Ensure external R1/R2 values are greater than 10 kΩ and C1 is at least 50 pF for proper operation.

Part Context

The CD4046BC series is a standard micropower PLL family. The 'M' suffix in CD4046BCM indicates the 16-lead Small Outline Integrated Circuit (SOIC) package (JEDEC MS-012). Other variants include the CD4046BCN for the 16-lead Plastic Dual-In-Line (PDIP) package. This part is functionally compatible with other industry-standard 4046B devices.

Replacement Considerations

Compatible replacements include the CD4046BCN (PDIP package) from the same family. Cross-manufacturer equivalents such as the HEF4046B (NXP) or generic 4046B parts may be pin-compatible but require verification of electrical characteristics against the Fairchild datasheet specifications.