BU8874F-E2

Overview

The BU8874F-E2 is a DTMF receiver IC designed for telephone answering machines, converting 16 distinct DTMF signals into 4-bit binary serial data. It features a wide dynamic range of 45dB with internal AGC, eliminating the need for external input amplifiers. The device operates within a supply voltage range of 4.75V to 5.25V and consumes 2.2mA during operation. It supports power-down mode and allows guard time control via a host microcontroller through the ACK pin.

Feature Summary

• Wide dynamic range of 45dB with internal automatic gain control
• Guard time control capability via host microcontroller interface
• Low power consumption with dedicated power-down mode
• Serial output of 4-bit binary data corresponding to detected tones

Applications

• Telephone answering machines
• DTMF signaling circuits
• Voice response systems

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Ensure the package type matches the required SOP-18 form factor. Confirm RoHS compliance status if environmental regulations apply to the specific manufacturing batch. Cross-reference ordering codes with distributor catalogs to ensure correct suffix identification.

Selection Notes

Select this component when designing telephone answering systems requiring reliable DTMF decoding without external amplification. Consider the 45dB dynamic range for environments with varying signal strengths. Ensure the host controller can manage the ACK pin timing for proper data latching and guard time enforcement.

Part Context

This part belongs to the BU8874 family from ROHM Semiconductor, specifically engineered for telecom applications. It shares core functionality with the BU8874 but utilizes an SOP-18 package instead of DIP-8. The series is optimized for low-power voice processing in residential and commercial telephony equipment.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.