Datasheet Details
| Part number | BU8872FS |
|---|---|
| Manufacturer | ROHM |
| File Size | 169.76 KB |
| Description | DTMF receiver for telephones |
| Download | BU8872FS Download (PDF) |
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Overview: Communication ICs DTMF receiver for telephones BU8872 / BU8872FS The BU8872 and BU8872FS are DTMF receiver ICs developed for use in telephone answering machines, and convert 16 different types of DTMF signals into 4-bit binary serial data. In addition to a compact 8-pin DIP (BU8872) or 16-pin SSOP (BU8872FS) package, these receivers feature a wide dynamic range, eliminating the need for an external input amplifier. Expertise from a number of companies has been incorporated into these products to enable guard time control through a host microcomputer.
| Part number | BU8872FS |
|---|---|
| Manufacturer | ROHM |
| File Size | 169.76 KB |
| Description | DTMF receiver for telephones |
| Download | BU8872FS Download (PDF) |
|
|
|
s BU8872 / BU8872FS FInput / output circuits 195 Communication ICs FCircuit 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.
| Part Number | Description |
|---|---|
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| BU8874F | DTMF receiver for telephones |
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