BU8872FS-E2

Overview

The BU8872FS-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 an external input amplifier. The device operates within a supply voltage range of 4.5V to 5.5V and consumes 3.4mA of operating current. It supports guard time control via a host microcomputer and utilizes a 4.19MHz ceramic or crystal resonator. The component is housed in a 16-pin SSOP package and functions across a temperature range of -40°C to +85°C.

Feature Summary

• Converts DTMF signals into 4-bit binary serial data output
• Features 45dB dynamic range with internal automatic gain control
• Allows guard time control through host microcomputer interface
• Includes hysteresis on ACK input pins

Applications

• Telephone answering machines

Procurement Notes

Verify RoHS compliance and lead-free status before procurement. Confirm the specific suffix matches the required packaging format. Check for end-of-life status as availability may be limited. Ensure the host system provides the necessary 4.19MHz clock source. Validate that the application environment stays within the specified operating temperature limits.

Selection Notes

Select this component when a compact solution for DTMF decoding is required without external amplification. Ensure the design accommodates the 16-pin SSOP footprint. Verify compatibility with the host microcomputer for ACK pulse handling. Consider the power supply stability requirements for the 5V operation. Confirm the use of appropriate bypass capacitors to prevent latch-up issues.

Part Context

This part belongs to the BU8872 family of communication ICs manufactured by ROHM Semiconductor. It serves as the surface-mount variant (BU8872FS) compared to the DIP version. The series is specifically engineered for telecom applications requiring reliable dual-tone multi-frequency signal reception.

Replacement Considerations

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