HT9170D Integrated Circuit | Holtek | DTMF Receiver IC

The HT9170D from Holtek is a Dual-Tone Multi-Frequency (DTMF) receiver IC designed with integrated digital decoder and bandsplit filter functions. It supports power-down and inhibit modes for efficient operation, making it well-suited for telecommunication and remote control applications.

Using advanced digital counting techniques, the HT9170D detects and decodes all 16 standard DTMF tone pairs into a 4-bit binary output. Its high-performance switched-capacitor filters separate tone signals into low and high groups, while the built-in dial tone rejection circuit eliminates the need for external pre-filtering.

Key Features

• Full DTMF receiver with digital decoding

• Decodes 16 DTMF tone pairs into 4-bit code output

• Switched capacitor filters for precise tone separation

• Built-in dial tone rejection circuit

• Power-down and inhibit modes for low-power applications

• CMOS technology for low power consumption and high reliability

Applications

• Telecommunication systems

• Remote control units

• Security systems

• Telephone answering machines

• Caller ID and signaling applications