HT9170 Holtek DTMF Receiver [Original]

HT9170 Holtek DTMF Receiver IC - 16-Tone Decoder

The Holtek HT9170 is a Dual Tone Multi-Frequency (DTMF) receiver. It decodes all 16 standard DTMF tone pairs, providing a 4-bit digital output code. The device integrates a digital decoder and bandsplit filter functions. Switched capacitor filters separate incoming DTMF signals into low and high group frequencies. A built-in dial tone rejection circuit eliminates external pre-filtering requirements. HT9170B and HT9170D variants incorporate power-down and inhibit modes. Tone detection utilizes digital counting techniques. This integration minimizes external component count.

Specifications:

• Operating Voltage: 2.5V ~ 5.5V
• Package Type: 18-pin DIP IC
• Output Type: 4-bit Digital Code
• Decoding Method: Digital Counting Techniques
• Integrated Filters: Switched Capacitor Bandsplit Filters
• Special Features: Dial Tone Rejection, Power-down Mode (HT9170B/D), Inhibit Mode (HT9170B/D)
• Tone Pairs Decoded: All 16 DTMF Tone Pairs

Key features and benefits:

• 2.5V to 5.5V operating voltage range
• Integrated bandsplit filters and digital decoder
• Built-in dial tone rejection circuit
• Decodes all 16 standard DTMF tone pairs
• 4-bit digital output code
• 18-pin DIP package
• Power-down and inhibit modes (HT9170B/D types)
• Reduced external component requirement

Applications:

• Telecommunication Systems
• Remote Control Systems
• Interactive Voice Response (IVR) Systems
• Security and Access Control
• Home Automation
• Data Entry Terminals

Frequently Asked Questions:

Q: What is the operating voltage range for the HT9170?
A: The HT9170 operates within a voltage range of 2.5V to 5.5V.

Q: What package type is the HT9170 available in?
A: The HT9170 is available in an 18-pin DIP IC package.

Q: Does the HT9170 require external filters for DTMF decoding?
A: No, the HT9170 integrates bandsplit filters and a digital decoder, reducing the need for external components.

Package Includes:

*Image shown is a representation only.

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