CS61583 datasheet(11/44 Pages) CIRRUS

11 / 44 page

during the transmission of both marks and

spaces. This improves signal quality by minimiz-

ing reflections from the transmitter. Impedance

matching also reduces load power consumption

by a factor of two when compared to the return

loss achieved by using external resistors.

The CS61583 driver will automatically detect an

inactive TLCK input (i.e., no valid data is being

clocked to the driver). When this condition is de-

tected, the driver is forced low (except during

remote loopback) to output spaces and prevent

TTIP and TRING from entering a constant trans-

mit-mark state.

When any transmit configuration established by

CON[2:0], TAOS, or LLOOP changed states, the

transmitter stabilizes within 22 TCLK bit peri-

ods. The transmitter takes longer to stabilize

when RLOOP1 or RLOOP2 is selected because

the timing circuitry must adjust to the new fre-

quency from RCLK.

When the transmitter transformer secondaries are

shorted through a 0.5 ohm resistor, the transmit-

500

1.0

0.5

-0.5

250

750

1000

NORMALIZED

AMPLITUDE

CS61583

OUTPUT

PULSE SHAPE

TIME (nanoseconds)

ANSI T1.102

SPECIFICATION

Figure 6. Typical Pulse Shape at DSX-1 Cross Connect

269 ns

244 ns

194 ns

219 ns

488 ns

Nominal

Pulse

100

110

120

-10

-20

Percent

nominal

peak

voltage

G.703

Specification

Figure 7. Pulse Mask at the 2048 kbps Interface

Transmit Pulse

Width at 50%

Amplitude

Transmit Pulse Shape

Receiver

Slicing

Level

244 ns (50%)

E1: square, 2.37 Volts into 75

Ω

E1: square, 3.00 Volts into 120

Ω

50%

350 ns (54%)

DSX-1: 0-133 ft. / or DS1 FCC Part 68 Option A with undershoot

65%

350 ns (54%)

DSX-1: 133-266 ft.

65%

350 ns (54%)

DSX-1: 266-399 ft.

65%

350 ns (54%)

DSX-1: 399-533 ft.

65%

350 ns (54%)

DSX-1: 533-655 ft.

65%

324 ns (50%)

DS1: FCC Part 68 Option A (0 dB)

65%

Table 1. Configuration Selection

CS61583

DS172PP5

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