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부품번호 | BU8874 기능 |
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기능 | DTMF receiver for telephones | ||
제조업체 | ROHM Semiconductor | ||
로고 | |||
전체 10 페이지수
Communication ICs
DTMF receiver for telephones
BU8874 / BU8874F
The BU8874 and BU8874F 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 (BU8874) package,
these receivers feature a wide dynamic range, eliminating the need for an external input amplifier. Expertise from a num-
ber of companies has been incorporated into these products to enable guard time control through a host microcontroller.
FApplications
Telephone answering machines
FFeatures
1) Dynamic range of 45dB. (internal AGC)
2) Power down mode.
3) 4-bit binary serial data output.
4) Guard time can be controlled through host microcon-
troller.
5) Input pins equipped with hysteresis. (ACK pin)
6) 4.19MHz crystal resonator can be used.
7) 8-pin DIP package. (BU8874)
FBlock diagram
202
Communication ICs
FElectrical characteristics (unless otherwise noted, Ta=25_C, VDD=5.0V)
BU8874 / BU8874F
205
4페이지 Communication ICs
FApplication example
BU8874 / BU8874F
FSelecting attachment components
(1) Power supply components
(2) Oscillation components
C502 : This is the VDD bypass capacitor, and is normally
100µF.
JP501 : This is normally shorted. To test the current con-
sumption of the IC (at the point where the power
down mode is entered), insert a DC ammeter in
place of JP501.
X501 :
Use a crystal or ceramic resonator with an os-
cillation frequency of 4.194304MHz. If using a
ceramic resonator, there may be problems with
the precision of the oscillation frequency, so we
recommend using one of the ceramic resona-
tors listed below.
C591 :
If you are using a dedicated resonator X501de-
signed for DTMF receivers, capacitor C591
should be left open. If you are injecting an exter-
nal clock, X501 should be omitted and DC
blocking capacitor C591 used in its place. Typi-
cally, this capacitor should be 47µnF.
208
7페이지 | |||
구 성 | 총 10 페이지수 | ||
다운로드 | [ BU8874.PDF 데이터시트 ] |
당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는 |
구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
BU8871F | DTMF receiver for telephones | ROHM Semiconductor |
BU8872 | DTMF receiver for telephones | ROHM Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |