Datasheet Details
| Part number | BU8872 |
|---|---|
| Manufacturer | ROHM |
| File Size | 169.76 KB |
| Description | DTMF receiver for telephones |
| Download | BU8872 Download (PDF) |
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| Part number | BU8872 |
|---|---|
| Manufacturer | ROHM |
| File Size | 169.76 KB |
| Description | DTMF receiver for telephones |
| Download | BU8872 Download (PDF) |
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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.
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 | Description |
|---|---|
| BU8872FS | DTMF receiver for telephones |
| BU8871F | DTMF receiver for telephones |
| BU8874 | DTMF receiver for telephones |
| BU8874F | DTMF receiver for telephones |
| BU8899GU | Sound Generator |
| BU8241F | Cross point mixer |
| BU8241FS | Cross point mixer |
| BU8242F | Cross point mixer |
| BU8244F | Cross point mixer |
| BU8254GUW | 35bit LVDS Transmitter |