Datasheet Details
| Part number | BU8871F |
|---|---|
| Manufacturer | ROHM |
| File Size | 218.63 KB |
| Description | DTMF receiver for telephones |
| Download | BU8871F Download (PDF) |
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| Part number | BU8871F |
|---|---|
| Manufacturer | ROHM |
| File Size | 218.63 KB |
| Description | DTMF receiver for telephones |
| Download | BU8871F Download (PDF) |
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s 181 Communication ICs FInput / output circuits BU8871F 182 Communication ICs FElectrical characteristics DC characteristics (unless otherwise noted, Ta=25_C, VDD=5.0V) BU8871F AC characteristics (unless otherwise noted, Ta=25_C, VDD=5.0V) 183 Communication ICs FMeasurement circuits BU8871F 184 Communication ICs FCircuit operation (1) An overview of operation A DTMF signal is supplied to the INPUT pin and applied to a pair of 6th-order bandpass filters, which separate the DTMF signal into its high (COL) and low (ROW) frequencies.
The separated tones are converted into square waves and fed to a digital detector.
(See the block diagram.) The digital detector checks the two tones to see if they are within the valid DTMF frequency bands.
Communication ICs DTMF receiver for telephones BU8871F The BU8871F is a DTMF receiver ICs developed for use in telephone answering machines, and converts 16 different types of DTMF signals into 4-bit binary serial data.
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