參數(shù)資料
型號: EM78P568
廠商: ELAN Microelctronics Corp .
英文描述: 8-BIT OTP MICRO-CONTROLLER
中文描述: 8位檢察官微控制器
文件頁數(shù): 52/61頁
文件大?。?/td> 568K
代理商: EM78P568
EM78P568
8-bit OTP Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
01/31/2004 V4.7
(2) The other way is still to use built-in DAC tone gen. but need some external element to attenuate
CTCSS tone on DAO/P67 pin. Program some control bit to let CTCSS output on DAO/P67 pin refer
to VII.9 (3) description). Because DAO/P67 output is stair-case waveform, we need put simple RC
LPF circuit to smooth output waveform before CTCSS attenuation circuit. Also RC LPF has some
attenuation effect. It depends on its cut-off frequency of LPF. User can design by his own way.
There are two suggestion circuits for your reference as following.
MTX/P66
DAO/P67
31
32
FM
modulator
(I/O port)
VCC
(option)
(LPF for DA sample clk)
MTX/P66
DAO/P67
32
FM
modulator
(I/O port)
(bias)
31
(LPF for DA sample clk)
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