參數(shù)資料
型號: DS21552L
廠商: Maxim Integrated Products
文件頁數(shù): 122/137頁
文件大?。?/td> 0K
描述: IC TXRX T1 1-CHIP 5V 100-LQFP
產品培訓模塊: Lead (SnPb) Finish for COTS
產品變化通告: Product Discontinuation 20/Feb/2012
標準包裝: 90
功能: 單芯片收發(fā)器
接口: E1,HDLC,J1,T1
電路數(shù): 1
電源電壓: 4.75 V ~ 5.25 V
電流 - 電源: 75mA
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應商設備封裝: 100-LQFP(14x14)
包裝: 托盤
包括: DSX-1 和 CSU 線路補償發(fā)生器,HDLC 控制器,帶內回路代碼發(fā)生器和檢測器
DS21352/DS21552
85 of 137
Figure 16-1 EXTERNAL ANALOG CONNECTIONS
Table 16-2 TRANSMIT TRANSFORMER SELECTION
DEVICE
TRANSFORMER
RESISTOR Rt
DS21552
1.15 : 1
1.36 : 1
0 ohms Ideal, 2.2 ohms max
4.7 ohms Ideal
DS21352
2 : 1
0 ohms
See separate application note on line interface design criteria for full details.
NOTES:
1. Resistor values are +/-1%.
2. The Rt resistors are used to protect the device from over–voltage.
3. See the Separate Application Note for details on how to construct a protected interface.
4. Normally a TTL level clock is applied MCLK and the XTAL pin is left as an NC. Optionally a crystal can be applied across
the MCLK and XTALD pins.
Table 16-3 TRANSFORMER SPECIFICATIONS
SPECIFICATION
RECOMMENDED VALUE
Turns Ratio DS21352
1:1(receive) and1:2(transmit) 5%
Turns Ratio DS21552
1:1(receive) and1:1.15 or1:1.36(transmit) 5%
Primary Inductance
600
mH minimum
Leakage Inductance
1.0
mH maximum
Intertwining Capacitance
40 pF maximum
DC Resistance
1.2 Ohms maximum
RTIP
RRING
TTIP
TRING
T1 Receive
Line
T1 Transmit
Line
DS21352 / 552
0.47uF
(non-
polarized)
DVDD
DVSS
0.1uF
RVDD
RVSS
0.1uF
TVDD
TVSS
0.1uF
VDD
50
0.1uF
Rt
0.01uF
1.544MHz
XTALD
MCLK
NC
1 : 1
N : 1
(see table below)
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