參數(shù)資料
型號(hào): DS21Q55DK
英文描述: Quad T1/E1/J1 Transceiver Design Kit Daughter Card
中文描述: 四路T1/E1/J1收發(fā)器開發(fā)板子卡
文件頁(yè)數(shù): 67/99頁(yè)
文件大?。?/td> 325K
代理商: DS21Q55DK
DS21Q50
Page 67 of 99
19.1 RECEIVE CLOCK AND DATA RECOVERY
The DS21Q50 contains a digital clock recovery system. See Figure 4-1 and Figure
19-1
for more details. The
device couples to the receive E1 shielded twisted pair or COAX via a 1:1 transformer. See
Table
19-2
for transformer details. The 2.048 MHz clock attached at the MCLK pin is internally multiplied by 16
via an internal PLL and fed to the clock recovery system. The clock recovery system uses the clock from the
PLL circuit to form a 16 times over-sampler which is used to recover the clock and data. This over-sampling
technique offers outstanding jitter tolerance (see Figure 19-4).
Normally, RCLK is the recovered clock from the E1 AMI/HDB3 waveform presented at the RTIP and RRING
inputs. When no AMI signal is present at RTIP and RRING, a Receive Carrier Loss (RCL) condition will occur
and the RCLK will be sourced from the clock applied at the MCLK pin. If the jitter attenuator is either placed in
the transmit path or is disabled, RCLK can exhibit slightly shorter high cycles of the clock. This is due to the
highly over-sampled digital clock recovery circuitry. If the jitter attenuator is placed in the receive path (as is the
case in most applications), the jitter attenuator restores the RCLK to being close to 50% duty cycle. Please see
the Receive AC Timing Characteristics in Section 24.4 for more details.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS21Q55N 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Quad T1/E1/J1 Transceiver
DS21Q58 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:E1 Quad Transceiver
DS21Q58L 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流(最大值):595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q58L+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流(最大值):595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q58LN 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流(最大值):595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray