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XR-T56L85N Datasheet

  • XR-T56L85N

  • Low Power PCM Line Interface

  • 12頁(yè)

  • EXAR   EXAR

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XR-T56L85
...the analog plus company
TM
Low Power
PCM Line Interface
June 1997-3
FEATURES10
D
Low Power (Typical 14mA)
D
Single +5V Supply
D
Up to 2.048 Mbps Operation in Both TX and RX
Directions
D
Receiver Input can be:
鈥?Balanced Transformer Coupled
鈥?Capacitively (Twisted Pair)
鈥?Single Coaxial Capacitive Coupling
APPLICATIONS
D
T1 and CEPT Interfaces
D
CPI
D
DMI
GENERAL DESCRIPTION
The XR-T56L85 is a PCM line interface chip. It consists of
both transmit and receive circuitry in a DIL 18 pin
package. The maximum bit rate the chip can handle is
2.048 Mbps and the signal level to the received can be
ORDERING INFORMATION
Part No.
XR-T56L85N
XR-T56L85D
attenuated by 10dB of cable loss at half the bit rate. Total
current consumption is between 12-16mA at +5V.
Package
18 Lead 300 Mil CDIP
18 Lead 300 Mil JEDEC SOIC
Operating
Temperature Range
-40擄C to +85擄C
-40擄C to +85擄C
BLOCK DIAGRAM
PDC
1
Positive
Threshold
Comparator
+
鈥?/div>
Negative
Threshold
Comparator
鈥?/div>
+
TTL Buffer
11 RPOS
TTL Buffer
8
4
RCLK
TE
RXDATA+ 2
RXDATA- 3
Peak
Detector
TTL Buffer
10 RNEG
6
TANK BIAS
Bias
RXV
CC
9
RXGND 7
TXV
CC
18
TPOS 17
TCLK 16
TNEG 12
TXGND 14
TTL Buffer
TTL Buffer
Bias
5
BIAS
15 TXDATA+
13 TXDATA-
Figure 1. Block Diagram
Rev. 2.01
E1992
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
FAX (510) 668-7017
1

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