XEV90C-ITR Ver la hoja de datos (PDF) - Xecom

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XEV90C-ITR

PLCC Packaged DAA for Europe and North America

Xecom 

Figure 2: XEV90C Pin Configuration

CAP1 1

Ring 2

Tip 3

N/C 4

N/C 5

CAP2 6

N/C 7

DC1 8

DC2 9

XEV90C

(top)

18 RI(-)

17 N/C

16 OH(+)

15 T1

14 T2

13 /Mute

12 OH(-)

11 VCC

10 Gnd

XEV90C Pin Descriptions

PIN NAME DESCRIPTION

1 CAP1

2 Ring

3

Tip

4-5

6 CAP2

CAP1 provides a connection point for the external blocking capacitor on the XEV90C. Two

forty microfarad capacitors must be placed between the CAP1 and CAP2 pins for 56 KBPS

performance. Twenty microfarad capacitors can be used for lower data rate applications.

These polarized capacitors must be placed back-to-back to block line battery voltage of either

polarity. These capacitors must be rated at 50 volts for CTR21 applications and 10 volts if

CTR21 compliance is not required.

A 5 milliHenry inductor may be placed in series with the blocking capacitors to compensate for

the German billing tone filter. This filter is not addressed in CTR21 but is recommended for

applications destined for Germany to prevent interference with communications.

Along with the Tip signal, Ring provides the connection to the telephone line. FCC Part 68

Rules require a 1500 volt isolation barrier between the telephone line and all other circuits. This

isolation must be preserved throughout the system.

The telephone company places a DC “Battery” voltage across Tip and Ring on all public switched

telephone lines. The XEV90C will operate regardless of the polarity of this “Battery” voltage.

The “Battery” voltage drives up to 100 milliamps of DC loop current.

UL1950 requires minimum creepage and clearances distances be maintained between the Tip

and Ring traces and all other circuits. Clearance is the shortest distance between conductive

circuits; creepage is the distance between conductive surfaces along the surface.

Along with the Ring signal, Tip provides the connection to the telephone line. FCC Part 68

Rules require a 1500 volt isolation barrier between the telephone line and all other circuits.

This isolation must be preserved throughout the system.

No Connection

CAP2 provides a connection point for the external blocking capacitor on the XEV90C. Two

forty microfarad capacitors must be placed between the CAP1 and CAP2 pins for 56 KBPS

performance. Twenty micro-farad capacitors can be used to meet lower data rate applications.

These polarized capacitors must be placed back-to-back to block line battery voltage of either

polarity.

XECOM

(2)

XEV90C

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