參數(shù)資料
型號(hào)： MT88EBNR
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 無(wú)繩電話/電話
英文描述： 4-Wire Calling Number Identification Circuit 2 (4-Wire CNIC2)
中文描述： TELEPHONE CALLING NO IDENT CKT, PDSO20
封裝： 5.30 MM, MO-150AE, SSOP-20
文件頁(yè)數(shù)： 26/30頁(yè)
文件大?。?/td> 523K
代理商： MT88EBNR
MT88E45
Data Sheet
26
Zarlink Semiconductor Inc.
Figure 17 - Application Timing for BT Caller Display Service (CDS), e.g., CLIP
Notes:
1) The total recognition time is t
REC
= t
GP
+ t
DP ,
where t
GP
is the tone present guard time and t
DP
is the tone present detect time. V
TGt
is the comparator threshold (refer to Figure 55 for details).
2) The total tone absent time is t
ABS
= t
GA
+ t
DA ,
where t
GA
is the tone absent guard time and t
DA
is the tone absent detect time. V
TGt
is the comparator threshold (refer to Figure 55 for details).
3) By choosing t
GA
=15ms, t
ABS
will be 15-25ms so that the current wetting pulse and AC load can be applied right after the STD rising
edge.
4) SIN227 specifies that the AC and DC loads should be removed between 50-150ms after the end of the FSK signal, indicated by CD
returning to high. The MT88E45B may also be powered down at this time.
5) The MT88E45B should be taken out of FSK mode when FSK is not expected to prevent the FSK demodulator from reacting to other
in-band signals such as speech, DT-AS/CAS and DTMF tones.
6) PWDN, Tip/Ring CASen, FSKen are internal signals decoded from CB0/1/2.
7) This signal represents the mode of the DR/STD pin.
Ch. seizure
Mark
..101010..
Data
t
DP
t
DA
t
GP
t
GA
t
REC
t
ABS
Note 3
t
CP
t
CA
A
B
C
D
E
F
G
Zss (Refer to SIN227)
< 0.5mA (optional)
<120
μ
Aμ
Note 4
V
TGt
Note 5
A/B Wires
PWDN
Note 6
EST
ST/GT
STD
Note 7
TE DC load
TE AC load
FSKen
Note 6
CD
DR
Note 7
DCLK
DATA
OSC2
Note 1
Note 2
t
PU
t
PD
15
±
1ms
20
±
5ms
Data
50-150ms
Note 4
Tip/Ring
CASen
Note 6
Ring
Current wetting pulse (see SIN227)
Line Reversal
A
≥
100 ms
B = 88-110 ms
C
≥
45 ms (up to 5sec)
D = 80-262 ms
E = 45-75 ms
F
≤
2.5sec (typ. 500 ms)
G > 200 ms
Note:
All
obtained from SIN227
Issue 1
values
‘Idle State Tone Alert Signal’
DT-AS
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