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參數(shù)資料
| 型號： | MT88EBNR |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 無繩電話/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 |
| 文件頁數(shù)： | 8/30頁 |
| 文件大?。?/td> | 523K |
| 代理商： | MT88EBNR |
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MT88E45
Data Sheet
8
Zarlink Semiconductor Inc.
Figure 3 - Single Ended Input Configuration
Figure 4 - Differential Input Configuration
CAS Detection
In North America, CAS is used in off-hook signalling only. In Europe (ETSI) it is used in off-hook signalling, and by
BT in both on and off-hook signalling. ETSI calls it the Dual Tone Alerting Signal (DT-AS). Although the ETSI on-
hook standard contains a DT-AS specification, BT is the only administration known to employ CAS in on-hook
signalling. (BT calls it Tone Alert Signal.) The CAS/DT-AS characteristics are summarized in Table 3.
2130 Hz and 2750 Hz
CAS/DT-AS Characteristics
Bellcore
a
(Off-hook only)
ETSI
b
(Off-hook)
BT
c
(Off-hook = ‘Loop State’)
(On-hook = ‘Idle State’)
Frequency Tolerance
+/-0.5%
+/-0.5%
Off-hook: +/-0.6%
On-hook: +/-1.1%
+0.22 to -37.78 dBm
(-2 to -40 dBV)
On-hook: -43.78 dBm
(-46 dBV)
+/-7 dB
Signal Level (per tone)
-14 to -32 dBm
d
-9.78 to -32.78 dBm
(-12 to -35 dBV
e
)
Reject Level (per tone)
-45 dBm
Maximum Twist (V
2130Hz
/V
2750Hz
)
+/-6 dB
+/-6 dB
C
R
IN
IN+
IN-
GS
Highpass Corner Frequency
f
-3dB
= 1/(2
π
R
IN
C)
R
F
Voltage Gain
(A
V
) = R
F
/ R
IN
V
REF
C1
R1
C2
R4
R3
R2
R5
IN+
IN-
GS
V
REF
Differential Input Amplifier
C1 = C2
R1 = R4 (For unity gain R5= R4)
R3 = (R2R5) / (R2 + R5)
Voltage Gain
(A
V
diff) = R5/R1
Input Impedance
R1
2
+ (1/
ω
C)
2
(Z
IN
diff) = 2
Highpass Corner Frequency
f
-3dB
= 1/(2
π
R1C1)
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