XECOM XE0068DT Datasheet

XE0068DT

2/99

FCC Registered DAA Module with DTMF Transmitter/Decoder

Description

The XE0068DT is an FCC registered telephone line interface which includes a DTMF transmitter, DTMF decoder and call progress monitor.

FCC rules limit the signal level that equipment can place on the telephone line. The XE0068DT incorporates an Automatic Gain Control (AGC) circuit to control the output signal level. The AGC optomizes the output levele over a wide variety of input levels without introducing signal distortion.

FCC rules also dictate a 2-second delay at the start of each call. This billing delay prevents information transmission during the billing period. The XE0068DT includes this billing delay.

The integrated DTMF transceiver, call progress monitor and FCC registration make the XE0068DT ideal for network signalling applications.

Features

*Small Size - 2.28" x 1.08" x 0.42"

*FCC Part 68 Registered

*Ring Detection and Hookswitch Control

*1500 Volt Isolation;

*800 Volt Surge Protection;

*An Integral 2-Second Billing Delay

*Auotomatic Gain Control optimizes transmit level for most any input level.

*Integral DTMF transmitter and decoder

*Call progress Monitor

XE0068DT Block Diagram

XE0068DT Pin Configuration

D0

D1

D2

DTMF

D3

Transmitter

Tip

ESt

& Receiver

/RD

Ring

/WR

/CS

RS0

Line

Hook Switch

OH

CP

Transformer

StGT

2-4 Wire

Ring

RCVR

Convertor

Detect

XMIT

/RI

AGC

Billing Delay

D/V

Timer

VCC	o	1	26	o	Tip
D3	o	2
D2	o	3	24	o	Ring
D1	o	4
D0	o	5	22	o	/RI
/WR	o	6	21	o	OH
/RD	o	7	20	o	N/C
/CS	o	8	19	o	RCVR
RS0	o	9	18	o	XMIT
N/C	o 10		17	o	StGT
N/C	o 11		16	o	ESt
N/C	o 12		15	o	CP
D/V	o 13		14	o	GND

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XE0068DT

XE0068DT Mechanical Specifications

	Inches		Metric(MM)
Dim	Min	Max	Min	Max														A
A	2.270	2.290	57.66	58.17
B	1.065	1.095	27.05	27.81
C	0.420	0.430	12.32	13.08
D	0.890	0.910	22.61	23.11
E	1.190	1.210	30.23	30.73
F	0.125	0.200	3.18	5.08										Denotes Pin 1
G	0.080	0.100	2.03	2.54
H	0.530	0.550	13.46	13.97					C
J	0.090	0.110	2.29	2.79
K	0.020	0.025	0.51	0.64
							D		G						J
																		E
												H

XE0068DT ABSOLUTE MAXIMUM RATINGS

Storage Temperature	-25O C to +85O C
Operating Temperature Range *	0O C to +70O C
Maximum Solder Temperature	220O C
Maximum Time Above Eutectic (183O C)	90 seconds
Preheat Dwell Time	120 to 180 seconds

*The XEV90 can be ordered with an Operating Temperature of -40O C to +85O C at extra cost. Specify Industrial Temperature Range (ITR).

B

K

F

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XE0068DT

XE0068DT Typical Connection Diagram

Recommended Parts
Designation		Description
C1,	C2	47 picoFarad, 3000 Volts (Sprague part Number 30GA-T47
FB1,	FB2	Ferrite Beads (TDK part Number CB30-453215B)

XE0068DT Call Progress Detection Circuit

XE0068DT

5volts

5volts

10K

10K

.1ufd

St/GT

10K

LM339

374K

2N2907

-

ESt

+

10K

1N4148

CP

3K

150K

1M

1N4148

.15 ufd

5volts

to

IRQ

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XE0068DT

XE0068DT Pin Descriptions

PIN	NAME	I/0	DESCRIPTION
1	VCC	---	+5 Volts
2-5	D0-D3	I/O	These singals represent the 4-bit data bus which carries the DTMF information per
			the chart below.
6	WR	I	Read and Write determine the direction of DTMF data. A low on WR with RD high
			allows the processor to write to the XE0068DT.
7	RD	I	Read and Write determine the direction of DTMF data. A low on RD with WR low
			allows the processor to read from the XE0068DT.
8	CS	I	A low on Chip Select, selects the XE0068 DTMF data bus.
9	RS0	I	This input selects the register to be used. A low selects the data register.
13	D/V	I	A low on Voice/Data selects a transmit level of 0 dBm for voice or DTMF; a high
			sets a -9 dbm transmit level for data transfer.
14	GND	---	Ground
15	CP	O	In DTMF mode CP acts as an interrupt. CP goes low when a valid DTMF Tone is
			transmitted or received. In CallProgress Mode CP provides a square wave repre-
			sentation of the call progress signal on the phone line.
16	ESt	O	Goes high to indicate that a valid tone pair has been detected. A momentary loss of
			signal causes ESt to go low.
17	St/GT	I/O	As an input, ST/GT latches the DTMF code into the Receive Data Register when
			the threshold voltage is reached. As an output, St/GT goes high to disable the
			guard timer after the threshold voltage is reached.
18	XMIT	I	Analog input signal to the line interface, input impedance on XMIT is typically 10
			Kohms at 1800 Hz. Signals from -15 to +5 dBm will be placed on the line at -
			10dBm + 1 dBm.
19	RCVR	O	Analog output signal from the 2-4 wire converter, the output impedence of RCVR
			is typically 10 ohms at 1800 hz.
21	OH	I	Hookswitch control. A high closes the internal relay to connect the equipment to
			the phone line.
22	RI	O	Ring Indicate, output, active low, TTL, indicates the modem is receiving a ring sig-
			nal.
24	Ring	---	Ring connection to the phone line (RJ11 Pin 4).
26	Tip	---	Tip Connection to the phone line (RJ11 Pin 3)

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XE0068DT