Datasheet Details
| Part number | BU8871F |
|---|---|
| Manufacturer | ROHM |
| File Size | 218.63 KB |
| Description | DTMF receiver for telephones |
| Download | BU8871F Download (PDF) |
|
|
Overview: 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.
| Part number | BU8871F |
|---|---|
| Manufacturer | ROHM |
| File Size | 218.63 KB |
| Description | DTMF receiver for telephones |
| Download | BU8871F Download (PDF) |
|
|
|
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.
| Part Number | Description |
|---|---|
| BU8872 | DTMF receiver for telephones |
| BU8872FS | 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 |