DS2188(1998) Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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Компоненты Описание

производитель

DS2188
(Rev.:1998)

T1/CEPT Jitter Attenuator

Dallas Semiconductor -> Maxim Integrated 

DS2188

CRYSTAL REQUIREMENTS

The DS2188 must have a crystal connected to the

XTAL1 and XTAL2 pins. For T1 environments, the fre-

quency of this crystal should be 6.176 MHz. For CEPT

environments, the frequency of this crystal should be

8.192 MHz. Table 2 lists some suggested crystal man-

ufacturers that are recommended for use with the

DS2188. Also, see DS2188 Application Note, “Opera-

tion at Speeds Greater than E1” for additional informa-

tion.

CRYSTAL MANUFACTURERS Table 2

MANUFACTURER

JAN Crystal

M–TRON

PART #

6323–00, JC6A14

6323–00, JC8A14

4575–002

4575–001

FREQUENCY

6.176 MHz

8.192 MHz

6.176 MHz

8.192 MHz

CRYSTAL SELECTION GUIDELINES FOR THE DS2188

PARAMETER

SPECIFICATION

Parallel resonant frequency

6.176 MHz (T1) or 8.192 MHz (CEPT)

Mode

Fundamental

Load capacitance

14 to 20 pF (16 pF preferred)

Tolerance

±50 ppm over 0 to 70°C

Pullability

CL = 10 pF, delta_f = +175 to +250 ppm

CL = 45 pF, delta_f = –175 to –250 ppm

Effective series resistance

40 ohms maximum for 6.176 MHz

30 ohms maximum for 8.192 MHz

Crystal cut

AT

022798 6/11

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