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DS2187

Dallas Semiconducotr
Part Number DS2187
Manufacturer Dallas Semiconducotr
Description Receive Line Interface
Published Mar 30, 2005
Detailed Description DS2187 Receive Line Interface www.dalsemi.com FEATURES Line interface for T1 (1.544 MHz) and CEPT (2.048 MHz) primary r...
Datasheet PDF File DS2187 PDF File

DS2187
DS2187

Overview
DS2187 Receive Line Interface www.
dalsemi.
com FEATURES Line interface for T1 (1.
544 MHz) and CEPT (2.
048 MHz) primary rate networks Extracts clock and data from twisted pair or coax Meets requirements of PUB 43801, TR 62411, and applicable CCITT G.
823 Precision on-chip PLL eliminates external crystal or LC tank - no tuning required Decodes AMI, B8ZS, and HDB3 coded signals Designed for short loop applications such as terminal equipment to DSX-1 Reports alarm and error events Compatible with the DS2180A T1/ISDN Primary Rate and DS2181A CEPT Transceivers, as well as DS2141A T1 and DS2143 E1 Controllers Companion to the DS2186 T1/CEPT Transmit Line Interface and DS2188 T1/CEPT Jitter Attenuator Single 5V supply; low-power CMOS technology PIN ASSIGNMENT AVDD RAIS ZCSEN NC LCAP RCLKSEL RTIP RRING LOCK AVSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 DVDD RCL AIS BPV NC NC RPOS RNEG RCLK DVSS 20-Pin SOIC (300-mil) AVDD RAIS ZCSEN LCAP RCLKSEL RTIP RRING LOCK AVSS 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 DVDD RCL AIS BPV NC RPOS RNEG RCLK DVSS 18-Pin DIP (300-mil) DESCRIPTION The DS2187 T1/CEPT Receive Line Interface chip interfaces user equipment to North American (T1 1.
544 MHz) and European (CEPT 2.
048 MHz) primary rate communication networks.
The device extracts clock and data from twisted pair or coax transmission media and eliminates expensive discrete components and/or manual tuning required in existing T1 and CEPT line termination electronics.
Application areas include DACS, CSU, CPE, channel banks, and PABX-to-computer interfaces such as DMI and CPI.
1 of 10 112099 DS2187 DS2187 BLOCK DIAGRAM Figure 1 LINE INPUT Input signals are coupled to the DS2187 via a 1:2 center-tapped transformer as shown in Figure 2.
For T1 applications, R1 and R2 must be 200 ohms in order to properly terminate the line at 100 ohms.
R1 and R2 are set at 150 or 240 ohms for CEPT applications.
Special internal circuitry of the RTIP and RRING inputs permits negative si...


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