CS61583 datasheet(13/44 Pages) CIRRUS

13 / 44 page

age incoming frequency (e.g. following a device

reset) the attenuator will tolerate a minimum of

22 UIs before the overflow/underflow mecha-

nism occurs.

For T1/E1 line cards used in high-speed muti-

plexers (e.g., SONET and SDH), the jitter

attenuator is typically used in the transmit path.

The attenuator can accept a transmit clock with

gaps

≤ 28 UIs and a transmit clock burst rate of

≤ 8 MHz.

When the jitter attenuator is in the receive path and

loss of signal occurs, the frequency of the last re-

covered signal is held. When the jitter attenuator is

not in the receive path, the last recovered frequency

is not held and the output frequency becomes the

frequency of the reference clock.

A typical jitter attenuation curve is shown in Fig-

ure 9.

REFERENCE CLOCK

The CS61583 requires a reference clock with a

minimum accuracy of

±100 ppm for T1 and E1

applications. This clock can be either a 1X clock

(i.e., 1.544 MHz or 2.048 MHz), or can be a 8X

clock (i.e., 12.352 MHz or 16.384 MHz) as se-

lected by the 1XCLK pin. In systems with a

jittered transmit clock, the reference clock

should not be tied to the transmit clock and a

separate external oscillator should drive the ref-

erence clock input. Any jitter present on the

reference clock will not be filtered by the jitter

attenuator.

POWER-UP RESET

On power-up, the device is held in a static state

until the power supply achieves approximately

60% of the power supply voltage. When this

threshold is crossed, the device waits another 10

ms to allow the power supply to reach operating

voltage and then calibrates the transmit and re-

ceive circuitry. This initial calibration takes less

than 20 ms but can occur only if REFCLK and

TCLK are present. The power-up reset performs

the same functions as the RESET pin.

LINE CONTROL AND MONITORING

Line control and monitoring of the CS61583 is

achieved using the control pins. The controls and

indications available on the CS61583 are de-

tailed below.

Line Code Encoder/Decoder

Coding may be transparent, AMI, B8ZS, or

HDB3 and is selected using the CODER1,

CODER2, AMI1, and AMI2 pins. In the coder

mode, AMI, B8ZS, and HDB3 line codes are

available. The input data to the encoder is on

TDATA and the output data from the decoder is

in NRZ format on RDATA. See Table 4.

CODER[2:1]=0

CODER[2:1]=1

Transparent Mode

Enabled

and

AMI[2:1] Pin(s)

Disabled

AMI[2:1]=0

B8ZS/HDB3

Encoder/Decoder

Enabled

AMI[2:1]=1

AMI

Encoder/Decoder

Enabled

Table 4. Coder Mode Options

Frequency in Hz

100

1 k

10 k

b) Maximum

Attenuation

Limit

62411 (1990 Version)

Requirements

a) Minimum Attenuation Limit

CS61583 Performance

Figure 9. Typical Jitter Transfer Function

CS61583

DS172PP5

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