XECOM XE0068DT Datasheet
FCC Registered DAA Module with DTMF Transmitter/Decoder
XE0068DT
2/99
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
D0
D1
D2 DTMF
D3 Transmitter Tip
ESt & Receiver
/RD Ring
/WR
/CS
RS0 Line Hook Switch OH
CP Transformer
StGT
XE0068DT Pin Configuration
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
RCVR Convertor Detect
2-4 Wire Ring
N/C o10 17 o StGT
N/C o 11 16 o ESt
N/C o 12 15 o CP
/RI
D/V o 13 14 o GND
XMIT
D/V Timer
AGC Billing Delay
XECOM (1) XE0068DT
XE0068DT Mechanical Specifications
Inches Metric(MM)
Dim Min Max Min Max
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
G 0.080 0.100 2.03 2.54
H 0.530 0.550 13.46 13.97
J 0.090 0.110 2.29 2.79
K 0.020 0.025 0.51 0.64
D
G
C
Denotes Pin 1
J
H
A
B
K
E
F
XE0068DT ABSOLUTE MAXIMUM RATINGS
Storage T emperature -25O C to +85O C
Operating T emperature Range * 0O C to +70O C
Maximum Solder T emperature 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 T emperature Range (ITR).
XECOM (2) 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
St/GT
ESt
CP
5volts
.1ufd
2N2907
374K
3K
1N4148
10K
150K
10K
5volts
10K
LM339
-
+
10K
1N4148
1M
.15 ufd
to IRQ
XECOM (3) 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 representation 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)
XECOM (4) XE0068DT
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