参数资料
型号: DS21352LB
厂商: Maxim Integrated Products
文件页数: 120/137页
文件大小: 0K
描述: IC TXRX 1-CHIP T1 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: 单芯片收发器
接口: HDLC,T1
电路数: 1
电源电压: 3.14 V ~ 3.47 V
电流 - 电源: 75mA
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: DSX-1 和 CSU 线路补偿发生器,HDLC 控制器,带内回路代码发生器和检测器
DS21352/DS21552
83 of 137
16. LINE INTERFACE FUNCTION
The line interface function in the DS21352/552 contains three sections; (1) the receiver which handles
clock and data recovery, (2) the transmitter which waveshapes and drives the T1 line, and (3) the jitter
attenuator. Each of the these three sections is controlled by the Line Inter-face Control Register (LICR)
which is described below.
LICR: LINE INTERFACE CONTROL REGISTER (Address=7C Hex)
(MSB)
(LSB)
L2
L1
L0
EGL
JAS
JABDS
DJA
TPD
SYMBOL
POSITION
NAME AND DESCRIPTION
L2
LICR.7
Line Build Out Select Bit 2. Sets the transmitter build out; see Table 16-1
L1
LICR.6
Line Build Out Select Bit 1. Sets the transmitter build out; see Table 16-1
L0
LICR.5
Line Build Out Select Bit 0. Sets the transmitter build out; see Table 16-1
EGL
LICR.4
Receive Equalizer Gain Limit. 0 = –36 dB 1 = –30 dB
JAS
LICR.3
Jitter Attenuator Select. 0 = place the jitter attenuator on the receive side 1 = place
the jitter attenuator on the transmit side
JABDS
LICR.2
Jitter Attenuator Buffer Depth Select 0 = 128 bits 1 = 32 bits (use for delay
sensitive applications)
DJA
LICR.1
Disable Jitter Attenuator. 0 = jitter attenuator enabled 1 = jitter attenuator disabled
TPD
LICR.0
Transmit Power Down. 0 = normal transmitter operation 1 = powers down the
transmitter and 3-states the TTIP and TRING pins
16.1 RECEIVE CLOCK AND DATA RECOVERY
The DS21352/552 contains a digital clock recovery system. See Figure 3-1 and Figure 16-1 for more
details. The DS21352/552 couples to the receive T1 twisted pair via a 1:1 transformer. See for details.
The 1.544 MHz clock applied to 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 oversampler which is used to recover the clock and data. This oversampling technique offers
outstanding jitter tolerance (see Figure 16-4).
Normally, the clock that is output at the RCLKO pin is the recovered clock from the T1 AMI/B8ZS
waveform presented at the RTIP and RRING inputs. When no AMI signal is present at RTIP and RRING,
a Receive Carrier Loss (LRCL) condition will occur and the RCLKO 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, the
RCLKO output can exhibit slightly shorter high cycles of the clock. This is due to 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. Please see the
Receive AC Timing Characteristics in section 24 for more details.
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