XRT7295A/98ES-DS3 Exar, XRT7295A/98ES-DS3 Datasheet

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XRT7295A/98ES-DS3

Manufacturer Part Number
XRT7295A/98ES-DS3
Description
Peripheral Drivers & Components - PCIs comeswith XRT7295A
Manufacturer
Exar
Datasheet

Specifications of XRT7295A/98ES-DS3

Product Category
Peripheral Drivers & Components - PCIs
Rohs
yes
FEATURES
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GENERAL DESCRIPTION
The XRT7295AE E3 Integrated Line Receiver is a fully
integrates receive interface that terminates a bipolar
E3 (34.3684 Mbps) signal transmitted over coaxial
Cable. This device can be used with the XRT7296
Integrated Line Transmitter (see Figure 10),
The device provides the functions of receive equaliza-
tion (optional) automatic gain control (AGC), clock
recovery and data re-timing, loss of signal and loss-of
frequency lock detection. The digital system interface
is a dual-rail with received positive and negative 1s
appearing as unipolar digital signals on separate output
leads. The on-chip equalizer is designed for cable
ORDERING INFORMATION
Fully Integrated Receive Interface for E3
Signals
Integrated Equalization (Optional) and Timing
Recovery
Loss-of-Signal and Loss-of-Lock Alarms
Variable Input Sensitivity Control
5V Power Supply
Compliant with G703, G.775 and G.824 Specifi-
cations
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
Rev. 2.0.0
XRT7295AEIW
Part No.
20 J-lead 300 MIL JEDEC SOJ
Package
APPLICATIONS
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losses of 0 to 15dB. The receive input has a variable
input sensitivity control, providing three different sen-
sitivity settings. High input sensitivity allows for signifi-
cant amounts of flat loss or for use with input signals
at the monitor level. Figure 1 shows the block diagram
of the device.
The XRT7295AE is manufactured by using linear
CMOS technology. The XRT7295AE is available in a
20-pin plastic SOJ package for surface mounting. A pin
compatible version is available for DS3 or STS-1
applications. Please refer to the XRT7295AT data
sheet
Interface to E3 Networks
CSU/DSU Equipment
PCM Test Equipment
Fiber Optic Terminals
Multiplexers
(510) 668-7000
Temperature Range
Integrated line Receiver
-40°C to +85°C
XRT7295AE
Operating
FAX (510) 668-7017
E3 (34.368Mbps)
March 2003

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XRT7295A/98ES-DS3 Summary of contents

Page 1

... The on-chip equalizer is designed for cable ORDERING INFORMATION Part No. XRT7295AEIW Rev. 2.0.0 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 APPLICATIONS l Interface to E3 Networks l CSU/DSU Equipment l PCM Test Equipment ...

Page 2

XRT7295AE PIN CONFIGURATION Rev. 2.0.0 Figure 1. Block Diagram 2 ...

Page 3

PIN DESCRIPTION Pin # Symbol Type 1 GNDA 3,6 TMC1-TMC2 I 4,5 LPF-1-LPF RLOS O 8 RLOL O 9 GNDD 10 GNDC EXCLK I 14 ...

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XRT7295AE DC ELECTRICAL CHARACTERISTICS Test Conditions: -40 ° C < TA < +85 ° C, VDD = 5V +/-10% Typical values are for V =5.0V, 25 ° C, and random data. Maximum values for data. Symbol Parameter ...

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XRT7295AE XRT7296 Transmitter SYSTEM DESCRIPTION Receive Path Configurations The diagram in Figure 2 shows a typical system application for the XRT7295AE. In the receive signal path (see Figure 1), the internal equalizer can be included by setting REQB=0 or bypass ...

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XRT7295AE Line Termination and Input Capacitance The recommended receive termination is shown in Figure 3. The 75 resistor terminates the coaxial cable with its characteristic impedance. The 0.01 F capaci- tor to R couples the signal into the receive input ...

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PLL bandwidth, which in turn is a function of the input 1s density. For higher 1s densities, the amount of gener- ated jitter decreases. Generated jitter also depends on the quality of ...

Page 8

XRT7295AE Jitter Transfer Characteristic The jitter transfer characteristic indicates the fraction of input jitter that reaches the RCLK output as a function of input jitter frequency. Table 3 shows impor- tant jitter transfer characteristic parameters. Figure 6 also shows a ...

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False-Lock Immunity False-lock is defined as the condition where a PLL recovered clock obtains stable phase-lock at a fre- quency not equal to the incoming data rate. The XRT7295AE uses a combination frequency/phase- lock architecture to prevent false-lock. An on-chip ...

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XRT7295AE Figure 7. Test Set-up for Interference Immunity Requirements Digital Detection In addition to the signal amplitude monitoring of the analog LOS detector, the digital LOS detector monitors the recovered data 1s density. The RLOS alarm goes high if 160 ...

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Note: 1 Recommended shield beads are the Fair-Rite 2643000101 or the Fair-Rite 2743019446 (surface mount). Figure 8. Recommended Power Supply Bypassing Network Rev. 2.0.0 XRT7295AE Receive Input The connections to the receive input pin, RIN, must be carefully considered. Noise-coupling ...

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XRT7295AE TIMING CHARACTERISTICS Test Conditions: All timing characteristics are measured with 10pF loading, -40°C < TA < 85° +/-10% DD Symbol tRCH1RCH2 Clock Rise Time (10%-90%) tRCL1RCL1 Clock Fall Time (10% to 90% TRCGRD Receive Propagation Delay ...

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XRT7295AE Figure 10. Evaluation System Schematic Rev. 2.0.0 XRT7295AE XRT7296 13 ...

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XRT7295AE Rev. 2.0.0 14 ...

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... EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’ ...

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