參數(shù)資料
型號(hào): DS26303LN-75+A3
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 56/101頁(yè)
文件大?。?/td> 0K
描述: IC LIU E1/T1/J1 3.3V 144-ELQFP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 1
類型: 線路接口裝置(LIU)
驅(qū)動(dòng)器/接收器數(shù): 8/8
規(guī)程: T1/E1/J1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 144-LQFP 裸露焊盤(pán)
包裝: 托盤(pán)
其它名稱: 90-26303+7N3
DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
58 of 101
6.3.2
LIU Transmit Front-End
It is recommended to configure the transmitter’s LIU as described in Figure 6-4 and in Table 6-4. No series
resistors are required. The transmitter has internal termination for E1, J1, and T1 modes.
Figure 6-4. LIU Front-End
C1
DS26303
(One Channel)
TTIP
TRING
RTIP
RRING
Dt
Ct
1:2
TFt
1:2
TFr
Tx Line
Rx Line
TVDDn
TVSSn
TVS1
3.3V
C2
3.3V
C3
AVDDn
AVSSn
3.3V
C4
Rt
C5
Rt
30
A110
A100
A75
Table 6-4. LIU Front-End Values
MODE
COMPONENT
75
Ω COAX
120
Ω TWISTED
PAIR
100
Ω/110Ω
TWISTED PAIR
Tx Capacitance
Ct
560pF typical. Adjust for board parasitics for optimal return loss.
Tx Protection
Dt
International Rectifier: 11DQ04 or 10BQ060
Motorola: MBR0540T1
Rx Transformer 1:2
TFr
Tx Transformer 1:2
TFt
Pulse: T1124 (0°C to +70°C)
Pulse: T1114 (-40°C to +85°C)
Tx Decoupling (ATVDD)
C1
Common decoupling for all eight channels is 68
μF.
Tx Decoupling (ATVDD)
C2
Recommended decoupling per channel is 0.1
μF.
Rx Decoupling (AVDDn)
C3
Common decoupling for all eight channels is 68
μF.
Rx Decoupling (AVDDn)
C4
Common decoupling for all eight channels is 0.1
μF.
Rx Termination
C5
When in external impedance mode, Rx capacitance for all eight
channels is 0.1
μF. Do not populate if using internal impedance
mode.
Rx Termination
Rt
When in external impedance mode, the two resistors for all modes
are 15.0
Ω ±1%. Do not populate if using internal impedance mode.
Voltage Protection
TVS1
SGS-Thomson: SMLVT 3V3 (3.3V transient suppressor)
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