HT8870A frequency equivalent, dual tone multi frequency.
- Supply voltage UCC = (2,5
– 5,5) V - No external filter is required - Low-cost 3,58 MHz resonator is used - 1633 Hz signal detection inhibit - 3 state .
Operational amplifier non-inverting input Operational amplifier inverting input Operational amplifier output terminal Reference voltage output terminal “1633 Hz signal detection disable” input Power down mode input Clock oscillator input Clock oscill.
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