BU2624AF-E2

Overview

The BU2624AF-E2 is a PLL frequency synthesizer IC designed for car stereos, high-fidelity audio systems, and CD radio cassettes. It features low current dissipation (6.0mA typical during operation, 300μA in PLL OFF mode) and low superfluous radiation. The device includes two frequency measurement counter systems, two phase comparison outputs, and a built-in high-speed prescaler capable of dividing up to 130MHz VCO signals. It supports seven standard frequencies: 50kHz, 25kHz, 12.5kHz, 10kHz, 9kHz, 5kHz, and 1kHz. Electrical characteristics are specified at Ta = 25°C and VDD = 5.0V.

Feature Summary

• Built-in high-speed prescaler divides up to 130MHz VCO
• Low current dissipation: 6.0mA (operation), 300μA (PLL OFF)
• Seven selectable standard frequencies (1kHz to 50kHz)
• Two counters for intermediate frequency detection
• Unlock detection circuit with 8ms/16ms gate pulse selection

Applications

• Car stereos
• High-fidelity audio systems
• CD radio cassettes
• Receivers and other frequency generating devices

Procurement Notes

Verify the datasheet revision and specific ordering suffixes against ROHM official documentation before procurement. Confirm that the application environment remains within ordinary electronic equipment limits, as the product is not designed for extreme reliability requirements such as medical or aerospace instrumentation without prior consultation.

Selection Notes

Select this component for multi-band systems requiring low power consumption and precise frequency synthesis. Ensure the design accommodates the 5.0V operating voltage and serial data input interface (CE, CK, DA). Verify that the required standard frequency options (e.g., 10kHz vs 9kHz) align with regional broadcasting standards.

Part Context

The BU2624AF-E2 belongs to ROHM's Audio ICs category, specifically under PLL frequency synthesizers for tuners. It is engineered to support high-performance multi-band systems by providing dual counters and phase comparison outputs, distinguishing it from single-loop synthesizers.

Replacement Considerations

No direct replacement part numbers are listed in the provided datasheet. Engineers should evaluate alternative PLL synthesizers based on pin compatibility, supply voltage, and feature sets like prescaler speed and current consumption.

FAQ

What is the maximum VCO frequency supported by the prescaler?

The built-in high-speed prescaler can divide signals up to 130MHz.

How does the unlock detection circuit operate?

When control data GT equals 1 or CT equals 1, the unlock detection circuit operates for 8ms. If CT equals 0 or GT equals 0, the circuit resets.

What are the available standard frequencies?

The device supports seven standard frequencies: 50kHz, 25kHz, 12.5kHz, 10kHz, 9kHz, 5kHz, and 1kHz.