XECOM XEV90-ITR, XEV90 Datasheet

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XEV90

7-99

56 KBPS DAA in a PLCC Package

Description

Xecom’s XEV90 is a complete DAA integrated into a compact PLCC package. The XEV90 supports analog data transfer to 56 KBPS. The 68-Pin PLCC package permits automated, high-volume assembly.

Features

*Package: 68-Pin PLCC (only 18 pins used) dimensions 0.952 inches by 0.952 inches by 0.170 inches high

*Meets Total Harmonic Distortion requirements for reliable 56 Kbps modems (-85 dB typical);

The XEV90 does not sacrifice performance for small size and surface-mount convenience. The heart of the XEV90 is a proprietary, low profile, low distortion transformer. This wide bandwidth, low distortion device provides the clear signal path required for 56 KBPS analog data transfer.

Like all Xecom DAA's the XEV90 is a complete telephone line interface. It includes the telephone line transformer, line current holding circuit, hookswitch and ring indicator. The XEV90 replaces the dozens of components found in a discrete DAA design.

*Integrated Low-Distortion Telephone Line Transformer

*Integrated Ring Detection with active high and active low ouput signals

*Operates on either a single Power Supply of +5 or + 3 Volts;

*Solid-State Hookswitch Control with active high and active low inputs;

*FCC Part 68 Compliant;

*Extended Temperature Range available;

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1: XEV90 BLOCK DIAGRAM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MUTE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Impedance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dialing

 

 

 

 

 

 

 

 

 

 

L1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tip

 

 

 

 

 

 

 

 

 

 

 

Line Trans-

 

Line Current

 

Billing Tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T2

 

 

 

 

 

 

Holding Cir-

 

Filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

former

 

 

 

 

 

 

 

Ring

 

 

 

 

 

 

 

 

 

 

 

 

 

cuit

 

 

(Optional)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OH(+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hookswitch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OH(-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RI(+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ring De-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RI(-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XECOM

XEV90

XECOM XEV90-ITR, XEV90 Datasheet

Figure 2: XEV90 Pin Configuration

N/C

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

18

 

 

RI(-)

 

 

 

 

 

 

 

 

 

 

XEV90

 

 

 

Ring

 

 

2

 

 

17

 

 

RI(+)

 

 

 

 

Tip

 

 

3

 

(top)

 

16

 

 

OH(+)

 

 

 

 

N/C

 

 

4

 

 

 

15

 

 

T1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L2

 

 

5

 

 

 

14

 

 

T2

 

 

 

 

 

 

 

 

 

 

L1

 

 

6

 

 

 

13

 

 

/Mute

 

 

 

 

 

 

 

 

 

 

N/C

 

 

7

 

 

 

12

 

 

OH(-)

 

 

 

 

 

 

 

 

 

 

DC1

 

 

8

 

 

 

11

 

 

VCC

 

 

 

 

 

 

 

 

 

 

DC2

 

 

9

 

 

 

10

 

 

Gnd

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin Descriptions

PIN NAME DESCRIPTION

1

N/C

No Connection

2

Ring

Ring is one wire of the two-wire telephone line connection (RJ11 Pin 4). 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. Xecom recommends 0.100 inch spacing between traces connected to

 

 

Ring and all other conductors to preserve this isolation.

3

Tip

Tip is one wire of the two-wire telephone line connection (RJ11 Pin 3). The telephone company places

 

 

a DC "Battery" voltage across Tip and Ring on all public switched telephone lines. The XEV90 accepts

 

 

this line battery voltage without regard to its polarity.

4

N/C

No Connection

5, 6

L1 & L2

L1 and L2 provide the connective points for a billing tone filter when required.

7

N/C

No Connection

8, 9 DC1 & DC2

DC1 and DC2 control performance of the line current holding circuit. A jumper from DC1 to DC2

 

 

limits DC loop current to 60 milliamps. An open circuit between DC1 and DC2 permits loop currents up

 

 

to 100 milliamps as required for North America. A resistor may be placed between DC1 and DC2 to

 

 

alter the off-hook impedence to meet unique country requirements.

10

GND

Ground connection to the XEV90. This signal provides the reference for the OH output and RI input.

 

 

This pin should be connected to the systems digital ground.

11

VCC

+5 Volt power source for the XEV90. VCC powers the RI and OH control lines.

12

OH(-)

Modem switch-hook control: OH(-), an active low input, for controls the switch hook in the XEV90.

 

 

When the host activates pin 12, the switch-hook closes and the XEV90 seizes the local telephone line.

 

 

Pin 16 provides an active high switch-hook control. OH(-) should remian open when using OH(+).

The host can pulse OH(-) line to perform rotary dialing. The normal pulse rate is ten pulses per second. Closing the switch-hook creates a series of pulses. Dial one pulse for the digit one to ten pulses for the digit zero. The pulses on OH(-) must be asymmetrical, active for thirty-one milliseconds, inactive for sixty-nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required.

XECOM

(2)

XEV90

Pin Descriptions

PIN

NAME

DESCRIPTION

13

Mute

The Mute signal can be used for pulse (rotary) dialing. The host must toggle the Mute signal to generate

 

 

the dialing pulses.

14

T2

T2 in conjunction with T1 provides the differential input/output for the analog signal. T2 connects

 

 

directly to the secondary side of the miniature line transformer embedded into the XEV90. To match the

 

 

impedance of the DAA to the 600 ohm telephone line, a 320 ohm resistor must be connected in series

 

 

with T1 or T2.

15

T1

T1 in conjunction with T2 provides the differential input/output for the analog signal. T1 connects

 

 

directly to the secondary side of the miniature line transformer embedded into the XEV90. To match the

 

 

impedance of the DAA to the 600 ohm telephone line, a 320 ohm resistor must be connected in series

 

 

with T1 or T2.

16

OH(+)

Switch-hook control to the modem. OH(+) provides an active high input for controlling the switch

 

 

hook. When pin 16 is active, the switch-hook closes and the XEV90 seizes the local telephone line.

 

 

OH(+) should remain open when using OH(-).

 

 

The host can pulse OH(+) line to perform rotary dialing. The normal pulse rate is ten pulses per second.

 

 

Closing the switch-hook creates these pulses. Dial one pulse for the digit one to ten pulses for the digit

 

 

zero. The pulses on OH(+) must be asymmetrical, active for thirty-one milliseconds, inactive for sixty-

 

 

nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required.

17

RI(+)

Ring Indicate output from the modem. RI(+) is an active high, open-emmitter output. RI(+) provides

 

 

a square wave representation of the Ring signal present across Tip and Ring. This permits intelligent

 

 

monitoring of the incoming ring. The XEV90 recognizes ring voltages of thirty-eight to one hundred

 

 

fifty volts RMS in the frequency range of sixteen to sixty-eight Hertz. When using the RI(+) output,

 

 

a 20 Kohm pull-down resistor must be added to RI(+); RI(-) must be tied to VCC.

18

RI(-)

Ring Indicate output from the modem. RI(-) is an active low, open collector output. RI(-) provides

 

 

a square wave representation of the Ring signal present across Tip and Ring. This permits intelli-

gent monitoring of the incoming ring. The XEV90 recognizes ring voltages of thirty-eight to one hundred fifty volts RMS in the frequency range of sixteen to sixty-eight Hertz. Pin 17 provides an active high ring indication. When using the RI(-) output, a 20 Kohm pull-up resistor must be added to RI(-); RI(+) must be tied to ground.

XECOM

(3)

XEV90

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