CS61584A View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS61584A

Dual T1/E1 Line Interface

Cirrus Logic 

DS261PP5

CS61584A

13.2 Power Supply

As shown in Figure 27, the CS61584A operates

from a 3.3 Volt or 5.0 Volt supply. Separate power

and ground pins provide internal isolation. The best

way to configure the power supplies is to connect

all of the supply pins together at the device. The

various ground pins must not be more negative than

AGND. A 4.99 kΩ ±1% resistor must be connected

from BGREF to ground to provide an internal cur-

rent reference.

De-coupling and filtering of the power supplies is

crucial for the proper operation of the analog cir-

cuits. A capacitor should be connected between

each supply and its respective ground. For capaci-

tors smaller than 1 µF, use mylar or ceramic capac-

itors and place them as close as possible to their

respective power supply pins. Wire-wrap bread

boarding of the line interface is not recommended

because lead resistance and inductance defeat the

function of the de-coupling capacitors.

13.3 Quartz Crystal Specifications

When a reference clock signal is not available, a

quartz crystal operating at the 8X rate can be con-

nected across the REFCLK and XTALOUT pins.

The crystal must be AT-cut and fundamental mode.

The minimum specifications are shown in

Table 14. Based on these specifications, quartz

crystals suggested for use with the CS61584A are

shown in Table 15.

13.4 Crystal Oscillator Specifications

When a reference clock signal is not available, a

CMOS crystal oscillator operating at either the 1X

or 8X rate can be connected at the REFCLK pin.

The oscillator must have a minimum symmetry of

40-60% and minimum stability of ±100 ppm for T1

and E1 applications. Based on these specifications,

crystal oscillators suggested for use with the

Parameter

T1 parallel resonant

frequency

E1 parallel resonant

frequency

Resonant frequency

error (CL = 20 pF)

Temperature drift

(over system limits)

Drive level

Series resistance

Shunt capacitance

Aging

Min

-

-

-50

-100

-

-

-

-5

Typ Max

12.352 -

16.384 -

-

+50

- +100

-

500

-

50

-

7

-

+5

Unit

MHz

MHz

ppm

ppm

µW

Ω

pF

ppm/yr

Table 14. Quartz Crystal Specifications

Manufacturer

M-tron

SaRonix

Part Number

397-316

522-372

SRX5769

SRX5772

SRX5770

SRX5773

Package Type

ATS-49

through-hole

ATSM-49

surface mount

HC-49S

through-hole

49SMLB

surface mount

NOTE: Frequency tolerances are ±32 ppm with a -

40 to +85 °C operating temperature range.

Table 15. Suggested Quartz Crystals

Manufacturer

Comclok

CTS

M-tron

SaRonix

Part Number Contact Number

CT31CH (800)333-9825

CXO-65HG-5-I (815)786-8411

MH26TAD (800)762-8800

NTH250A (800)227-8974

NOTE: Frequency tolerances are ±32 ppm with a -

40 to +85 °C operating temperature range.

All are 8-pin DIP packages and can be tristated.

Table 16. Suggested Crystal Oscillators

50

DDS2S6216P1PF15

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