參數(shù)資料
型號： DS26502LN+
廠商： Maxim Integrated Products
文件頁數(shù)： 103/125頁
文件大?。?/td> 0K
描述： IC T1/E1/J1 64KCC ELEMENT 64LQFP
產(chǎn)品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 160
類型： BITS 元件，多路復用器
PLL： 是
主要目的： T1/E1
輸入： 時鐘
輸出： 時鐘
電路數(shù)： 1
比率 - 輸入:輸出： 2:3
差分 - 輸入:輸出： 無/無
頻率 - 最大： 6.312MHz
電源電壓： 3.135 V ~ 3.465 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 64-LQFP
供應商設備封裝： 64-LQFP（10x10）
包裝： 托盤
產(chǎn)品目錄頁面： 1430 (CN2011-ZH PDF)
DS26502 T1/E1/J1/64KCC BITS Element
79 of 125
13.2.2 Receive G.703 Section 13 Synchronization Signal
The DS26502 can receive a 2.048MHz square-wave synchronization clock as specified in Section 13 of
ITU G.703. To use the DS26502 in this mode, set the mode configuration bits in the Mode Configuration
Register (MCREG).
13.2.3 Monitor Mode
Monitor applications in both E1 and T1 require various flat gain settings for the receive-side circuitry.
The DS26502 can be programmed to support these applications via the monitor mode control bits MM1
and MM0 in the LIC3 register.
Figure 13-2. Typical Monitor Application
13.3 LIU Transmitter
The DS26502 uses a phase-lock loop along with a precision digital-to-analog converter (DAC) to create
the waveforms that are transmitted onto the E1 or T1 line. The waveforms created by the DS26502 meet
the latest ETSI, ITU, ANSI, and AT&T specifications. The waveform that is to be generated is set by the
transmit mode bits (TMODE[3:0]) in the MCREG register, as well as the L2/L1/L0 bits in register LIC1
if applicable.
ITU specification G.703 requires an accuracy of ±50ppm for both T1 and E1. TR62411 and ANSI specs
require an accuracy of ±32ppm for T1 interfaces. The transmit clock can be sourced from the recovered
clock (RCLK), the pre-scaled MCLK, the TCLK pin or the TX PLL. See the TX PLL clock mux diagram
in Figure 3-3. Due to the nature of the design of the transmitter in the DS26502, very little jitter (less than
0.005UIP-P broadband from 10Hz to 100kHz) is added to the jitter present on the selected transmit clock
source. Also, the waveforms created are independent of the duty cycle of TCLK. The transmitter in the
DS26502 couples to the transmit twisted pair (or coaxial cable in some applications) via a 1:2 step-up
transformer. For the device to create the proper waveforms, the transformer used must meet the
specifications listed in Table 13-1. The DS26502 has the option of using software-selectable transmit
termination.
PRIMARY
T1/E1 TERMINATING
DEVICE
MONITOR
PORT JACK
T1/E1 LINE
X
F
M
R
DS26502
Rt
Rm
SECONDARY T1/E1
TERMINATING
DEVICE
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相關代理商/技術參數(shù)
參數(shù)描述
DS26502LN+ 功能描述:計時器和支持產(chǎn)品 E1/T1/J1/64Kcc Bits Element RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel
DS26503 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:T1/E1/J1/64KCC BITS Element
DS26503_07 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:T1/E1/J1 BITS Element
DS26503DK 功能描述:時鐘和定時器開發(fā)工具 DS26503 Dev Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V
DS26503L 功能描述:計時器和支持產(chǎn)品 E1-T1-J1 Bits Element RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel
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