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| 型号： | DS21Q59L |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 42/76页 |
| 文件大小： | 0K |
| 描述： | IC TXRX E1 QUAD 3.3V 100-LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS |
| 产品变化通告： | Product Discontinuation 20/Feb/2012 |
| 标准包装： | 90 |
| 功能： | 收发器 |
| 接口： | E1 |
| 电路数： | 4 |
| 电源电压： | 3.14 V ~ 3.47 V |
| 电流 - 电源： | 230mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-LQFP（14x14） |
| 包装： | 托盘 |
| 包括： | AIS 警报检测器和发生器，回送功能，PRBS 发生器 / 检测器，远程检测器和发生器 |
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DS21Q59 Quad E1 Transceiver
47 of 76
21.
LINE INTERFACE UNIT
The line interface unit contains three sections: the receiver, which handles clock and data recovery; the transmitter,
which waveshapes and drives the E1 line; and the jitter attenuator. The line interface control register (LICR),
described below, controls each of these three sections.
Register Name:
LICR
Register Description:
Line Interface Control Register
Register Address:
17 Hex
Bit #
7
6
5
4
3
2
1
0
Name
L2
L1
L0
EGL
JAS
JABDS
DJA
TPD
NAME
BIT
FUNCTION
L2
7
Line Build-Out Select Bit 2. Sets the transmitter build-out.
L1
6
Line Build-Out Select Bit 1. Sets the transmitter build-out.
L0
5
Line Build-Out Select Bit 0. Sets the transmitter build-out.
EGL
4
Receive Equalizer Gain Limit
0 = -12dB
1 = -43dB
JAS
3
Jitter Attenuator Select
0 = place the jitter attenuator on the receive side
1 = place the jitter attenuator on the transmit side
JABDS
2
Jitter Attenuator Buffer Depth Select
0 = 128 bits
1 = 32 bits (use for delay-sensitive applications)
DJA
1
Disable Jitter Attenuator
0 = jitter attenuator enabled
1 = jitter attenuator disabled
TPD
0
Transmit Power-Down
0 = powers down the transmitter and tri-states the TTIP and TRING pins
1 = normal transmitter operation
21.1 Receive Clock and Data Recovery
The DS21Q59 contains a digital clock recovery system. (See Figure 3-1 and Figure 21-1 for more details.) The
device couples to the receive E1 shielded twisted pair or coax through a 1:1 transformer (Table 21-B). The
2.048MHz clock attached at the MCLK pin is internally multiplied by 16 through 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 oversampler,
which is used to recover the clock and data. This oversampling technique offers outstanding jitter tolerance
(Figure 21-4).
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, an RCL condition occurs and the RCLK is 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 because of the highly oversampled 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. See Receive AC Characteristics in Section 26.4 for more
details.
21.1.1 Termination
The DS21Q59 is designed to be fully software-selectable for 75
W and 120W termination without the need to change
any external resistors. The user can configure the DS21Q59 for 75
W or 120W receive termination by setting the
IRTSEL (CCR5.4) bit. When using the internal termination feature, the external termination resistance should be
120
W (typically two 60W resistors). Setting IRTSEL = 1 causes the DS21Q59 to internally apply parallel resistance
to the external resistors to adjust the termination to 75
W (Figure 21-2).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21Q59L+ | 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q59LN | 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q59LN+ | 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21S07A | 制造商:Maxim Integrated Products 功能描述: |
| DS21S07AE | 功能描述:SCSI 接口集成电路 RoHS:否 制造商:Texas Instruments 工作电源电压:2.7 V to 5.25 V 电源电流:13 mA 最大工作温度:+ 70 C 最小工作温度:0 C 安装风格:SMD/SMT 封装 / 箱体:SSOP-36 封装:Tube |
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