BU2630F

Overview

The BU2630F is a CMOS LSI dual PLL frequency synthesizer designed for cordless telephones and communications equipment. It features independent control of transmission and reception VCOs, with separate programmable reference frequency and main counter settings. The device supports operation up to 80MHz at VDD = 2.5V. Current dissipation is low: 2.2mA (typ) in dual-system mode, 1.2mA (typ) in single-system mode, and 0.2mA (typ) in non-operating state at VDD = 3V. It includes a 16-bit main counter, an internal 14-bit reference frequency counter, unlock detection, four open-drain output ports, and 3-wire serial input control.

Feature Summary

• Dual PLL synthesizer with independent TX/RX VCO control
• Low current consumption: 2.2mA (dual), 1.2mA (single), 0.2mA (standby)
• 16-bit main counter and 14-bit reference frequency counter
• Unlock detection and four open-drain output ports

Applications

• Cordless telephones
• Amateur short wave radios
• Industrial transceivers
• VHF/UHF frequency generators

Procurement Notes

Verify the specific suffix (e.g., F vs FV) against the manufacturer's official datasheet to confirm pinout and electrical parameter variations. Confirm package availability and lead times directly with ROHM or authorized distributors prior to ordering.

Selection Notes

Select based on required operating frequency (up to 80MHz) and power constraints. Ensure the 3-wire serial interface matches the system controller. Verify that the open-drain outputs meet the load requirements of the connected VCOs.

Part Context

The BU2630F belongs to ROHM's communication IC family, specifically targeting dual-channel frequency synthesis needs in portable and industrial radio applications. It serves as a core component for generating stable carrier frequencies in transceivers.

Replacement Considerations

Cross-reference with other dual PLL synthesizers from ROHM or competitors like Sanyo (LM7006) or Toshiba (TB31206FN). Verify functional compatibility, pinout, and electrical specifications before substitution.

FAQ

What is the maximum operating frequency of the BU2630F?

The BU2630F can operate at frequencies up to 80MHz when VDD is 2.5V.

How many output ports does the BU2630F provide?

It provides four output ports, which are configured as open-drain outputs.

Can the transmission and reception VCOs be controlled independently?

Yes, the BU2630F allows independent control of VCOs for transmission and reception, along with separate programming of reference frequency and main counter settings.