CS61575 データシートの表示（PDF） - Cirrus Logic

部品番号

コンポーネント説明

メーカー

CS61575

T1/E1 Line Interface

Cirrus Logic 

CS61574A CS61575

MODE

FUNCTION

EXTENDED

PIN HARDWARE HARDWARE

TRANSMITTER 3

4

TPOS

TNEG

TDATA

TCODE

6

RNEG

BPV

7

RECEIVER/DPM 11

RPOS

DPM

RDATA

AIS

17

MTIP

RCODE

18 MRING

-

18

-

PCS

23

LEN0

LEN0

24

CONTROL

25

LEN1

LEN2

LEN1

LEN2

26 RLOOP

RLOOP

27 LLOOP

LLOOP

28

TAOS

TAOS

HOST

TPOS

TNEG

RNEG

RPOS

DPM

MTIP

MRING

-

INT

SDI

SDO

CS

SCLK

CLKE

Table 2. Pin Definitions

Transmitter

The transmitter takes digital T1 or E1 input data

and drives appropriately shaped bipolar pulses

onto a transmission line. The transmit data (TPOS

& TNEG or TDATA) is supplied synchronously

and sampled on the falling edge of the input

clock, TCLK.

Either T1 (DSX-1 or Network Interface) or E1

CCITT G.703 pulse shapes may be selected.

Pulse shaping and signal level are controlled by

"line length select" inputs as shown in Table 3.

LEN2 LEN1 LEN0 Option Selected Application

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

0-133 FEET

133-266 FEET

266-399 FEET

399-533 FEET

533-655 FEET

DSX-1

ABAM

(AT&T 600B

or 600C)

0

0

0

120Ω (1:1.26)

75Ω (1:1)

E1

CCITT G.703

0

0

1

AT&T CB113

Repeater

0

1

0 FCC PART 68, OPT. A Network

0

1

1

ANSI T1.403

Interface

Table 3. Line Length Selection

NORMALIZED

AMPLITUDE

1.0

0.5

ANSI TI.102,

AT&T CB 119

SPECIFICATIONS

0

-0.5

0

OUTPUT

PULSE SHAPE

250

500

750

TIME (nanoseconds)

1000

Figure 8. Typical Pulse Shape at DSX-1 Cross Connect

The CS61575 and CS61574A line drivers are de-

signed to drive a 75 Ω equivalent load.

For E1 applications, the CS61574A and CS61575

drivers provide 14 dB of return loss during the

transmission of both marks and spaces. This im-

proves signal quality by minimizing reflections

off the transmitter. Similar levels of return loss

are provided for T1 applications.

For T1 DSX-1 applications, line lengths from 0 to

655 feet (as measured from the transmitter to the

DSX-1 cross connect) may be selected. The five

partition arrangement in Table 3 meets ANSI

T1.102 and AT&T CB-119 requirements when

using #22 ABAM cable. A typical output pulse is

shown in Figure 8. These pulse settings can also

be used to meet CCITT pulse shape requirements

for 1.544 MHz operation.

For T1 Network Interface applications, two addi-

tional options are provided. Note that the optimal

pulse width for Part 68 (324 ns) is narrower than

the optimal pulse width for DSX-1 (350 ns). The

CS61575 and CS61574A automatically adjusts

the pulse width based upon the "line length" se-

lection made.

DS154F2

11

Share Link: