HT9170B
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The HT9170B is a Dual-tone multi-frequency (DTMF) receiver IC designed by Holtek. It is used to decode DTMF signals commonly found in telecommunication systems. The IC converts the DTMF tones into digital signals, making it suitable for applications like telephone answering machines, remote control systems, and other telecommunication devices. The HT9170B is packaged in a DIP format, making it easy to use in prototyping and development projects.
Key Features:
- Decodes DTMF signals into 4-bit binary codes
- High input sensitivity
- Minimal external components required
- Low power consumption
- Power-down mode for energy savings
- On-chip clock generator
- Three-state output for data bus interfacing
- Crystal oscillator interface
- Operating Voltage: 2.5V to 5.5V
- Current Consumption: Low power operation
- Frequency Accuracy: ±0.5%
- Input Signal Range: -38dBm to 0dBm
- Output: 4-bit binary code corresponding to DTMF signals
- Clock Frequency: 3.579545 MHz (typical)
- Package Type: DIP
- Operating Temperature Range: -25°C to +75°C
- Telephone answering machines
- Remote control systems
- Telecommunication systems
- Security systems
- Caller ID systems
- Interactive voice response systems
Technical Specifications:
- Logic Family: CMOS
- Number of Channels: 3
- Switch Configuration: Single-Pole Double-Throw (SPDT)
- Supply Voltage Range: 3V to 15V
- “ON” Resistance (R_ON): 125Ω typical at V_DD = 10V
- “OFF” Leakage Current (I_OFF): ±100pA typical at V_DD = 10V
- Control Input Voltage (V_IH): 0.7 V_DD min, 0.3 V_DD max
- Maximum Operating Frequency: 40 MHz at V_DD = 10V
Applications:
- Signal routing and switching
- Analog and digital multiplexing
- Audio and video signal processing
- Data acquisition systems
- Test equipment