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MT88E45BNR 参数 Datasheet PDF下载

MT88E45BNR图片预览
型号: MT88E45BNR
PDF下载: 下载PDF文件 查看货源
内容描述: [Telephone Calling No Identification Circuit, CMOS, PDSO20, 5.30 MM, SSOP-20]
分类和应用: 光电二极管
文件页数/大小: 30 页 / 1053 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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Advance Information  
MT88E45  
CPE unmutes handset  
and enables keypad  
CPE goes off-hook  
CPE mutes handset & disables keypad  
CPE sends  
TIP/RING  
Note 5  
Mark  
Data  
F
CAS  
A
ACK  
C
Note 1  
E
G
B
D
PWDN  
Note 8  
Hybrid CASen  
Note 8  
Note 2  
Note 3  
Note 4  
FSKen  
Note 8  
t
PU  
OSC2  
EST  
t
t
DA  
DP  
t
GA  
t
GP  
V
ST/GT  
TGt  
t
t
REC  
ABS  
STD  
Note 9  
t
t
CP  
CA  
Note 6  
Note 7  
CD  
A = 75-85ms  
B = 0-100ms  
C = 55-65ms  
D = 0-500ms  
E = 58-75ms  
F = feature specific  
G 50ms  
DR  
Note 9  
DCLK  
DATA  
Data  
Figure 16 - Application Timing for Bellcore Off-hook Data Transmission, e.g., CIDCW  
Notes:  
1) In a CPE where AC power is not available, the designer may choose to switch over to line power when the CPE goes off-hook and  
use battery power while on-hook. The CPE must also be CID (on-hook) capable because a CIDCW CPE includes CID functionality.  
2) Non-FSK signals such as CAS, speech and DTMF tones are in the same frequency band as FSK. They will be demodulated and  
give false data. Therefore the MT88E45 should be taken out of FSK mode when FSK is not expected.  
3) The MT88E45 may be put into FSK mode as soon as the CPE has finished sending the acknowledgment signal ACK. TR-NWT-  
000575 specifies that ACK = DTMF ‘D’ for non-ADSI CPE, ‘A’ for ADSI CPE.  
4) The MT88E45 should be taken out of FSK mode when CD has become inactive, or after 5 framing errors have been detected, or  
after 150ms of continuous mark signal or space signal has been received. The framing errors need not be consecutive.  
5) In an unsuccessful attempt where the end office does not send the FSK signal, the CPE should unmute the handset and enable the  
keypad after interval D has expired.  
6) The total recognition time is t  
= t + t , where t is the tone present guard time and t is the tone present detect time. V  
REC  
GP DP GP DP  
TGt  
is the comparator threshold (refer to Figure 5 for details).  
7) The total tone absent time is t = t + t , where t is the tone absent guard time and t is the tone absent detect time. V  
ABS  
GA  
DA  
GA  
DA  
TGt  
is the comparator threshold (refer to Figure 5 for details).  
8) PWDN, Hybrid CASen and FSKen are internal signals decoded from CB0/1/2.  
9) This signal represents the mode of the DR/STD pin.  
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