參數(shù)資料
型號(hào): AK2305
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Dual PCM CODEC for ISDN TERMINAL ADAPTER
中文描述: 雙PCM編解碼器的ISDN終端適配器
文件頁(yè)數(shù): 21/43頁(yè)
文件大?。?/td> 481K
代理商: AK2305
ASAHI K ASEI [AK 2305]
C0029-E-02 21 1999/8
TONE GENERATOR
Generates two kinds of tone, 400Hz and 1300Hz.
One of them is selected by TMDn register.
SELECTION OF TONE
Selects 1 tone from 400Hz/1300Hz by TMDn register.
Tone selection register
TMDn
Tone frequency
Remarks
0
400Hz
Reset
1
1300Hz
(n=0,1)
SELECTION OF OUTPUT PIN
VRX0, VRX1, TNOUT is available for Tone output pin by S1-S9 switch.
S1-S9 switch is controlled by each register.
Tone output by switch controlling
Output
circuits
VRX0
VRX1
TNOUT
Register setting
Remarks
TONEGEN0
S1
S4
S7
TONEGEN1
S2
S5
S8
AUX
S3
S6
S9
“0” : OFF
“1” : ON
All “0”
when reset
TONE OUTPUT ENABLE
Inputting “1” to TNOEn, defined tone is output.
Tone Output Enable
TONEn
Output States
0
AGND
1
Tone
AUX INPUT
Input signal from external CPU/Tone generators.
Signals are output on VRXn, TNOUT via VRnR, VRTN.
Output signals are switched onto each pin by S3, S6, and S9 which are controlled by registers.
(See “SELECTION OF OUTPUT PIN” above.)
Must input with an external cap(>0.1uF.)
Input impedance is 200k
±25%.
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