參數(shù)資料
型號(hào): T7256A
英文描述: Compliance with the New ETSI PSD Requirement
中文描述: 符合新的ETSI PSD的要求
文件頁數(shù): 79/116頁
文件大?。?/td> 1056K
代理商: T7256A
Data Sheet
January 1998
T7256 Single-Chip NT1 (SCNT1) Transceiver
Lucent Technologies Inc.
75
Electrical Characteristics
(continued)
S/T-Interface Receiver Common-Mode Rejection
Table 37. S/T-Interface Receiver Common-Mode Rejection
Crystal Characteristics
Table 38. Fundamental Mode Crystal Characteristics
These are the characteristics of a parallel resonant crystal for meeting the
±
100 ppm requirements of T1.601 for NT
operation. The parasitic capacitance of the PC board to which the T7256 crystal is mounted must be kept within the
range of 0.6 pF
±
0.4 pF.
Table 39. Internal PLL Characteristics
* Set by digital PLL; therefore, variations track U-interface line rate.
Parameter
Symbol
CMR
Specifications
400
Unit
mV
Common-mode Rejection (at device pins)
Parameter
Symbol
F
O
TOL
Test Conditions
With 25.0 pF of loading
Specifications
15.36
±
70
Unit
MHz
ppm
Center Frequency
Tolerance Including Calibration,
Temperature Stability, and Aging
Drive Level
Series Resistance
Shunt Capacitance
Motional Capacitance
DL
R
S
C
O
C
M
Maximum
Maximum
0.5
20
mW
pF
fF
3.0
±
20%
12
±
20%
Parameter
Test Conditions
–3 dB point (NT), 18 kft 26 AWG
1.5 Hz typical
Min
±
250
Typ
5*
1.0*
Max
Unit
ppm
Hz
dB
Total Pull Range
Jitter Transfer Function
Jitter Peaking
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