EV6020 Datasheet, PDF (11/13 Pages) CML Microcircuits – Evaluation Kit User Manual

Evaluation Kit User Manual for FX602
EV6020
1.6.1.10 DTMF Answerback Code
The DTMF answerback code may be selected by an appropriate choice of the four jumpers JP9.
Fitting a jumper sets that input to logic '0'. If not fitted, the input is pulled-up on-chip to logic '1'.
Alternatively, all of the JP9 jumpers may be omitted and the DTMF generator may be driven from a µ
C. A logic '1' on TX-DTMF (J1 pin 5) enables the generator and illuminates the LED.
DTMF GENERATOR DECODE TABLE
J1:9 (D3)
J1:10 (D2) J1:11 (D1)
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
1
1
0
1
1
0
1
1
1
1
1
1
J1:12 (D0)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DTMF
CODE
D
1
2
3
4
5
6
7
8
9
0
#
A
B
C
1.6.1.11 Line Impedance Matching
Line impedance matching is provided by R20, which is not fitted. A resistor (value ≈ 600Ω) is required
for the evaluation board to operate correctly.
1.6.1.12 Voice Mute
A mutable local voice input is provided on test point TP18. A logic '1' on /MUTE (J1 pin 20) unmutes
the voice input and illuminates the LED. Access to voice signals is provided as follows:
The hybrid receive output (Rx = remote voice) is located on test point TP16.
The hybrid transmit output (Tx = local voice) is located on test point TP15.
1.6.1.13 Evaluation Device FX602/FX604/FX614
If the evaluation device is an FX602 it should be fitted in socket U2 position 1 and jumper JP10 should
be fitted. If the evaluation device is an FX604 or FX614 it should be fitted in socket U2 position 2 and
jumper JP10 should be removed, thus disabling the parallel phone detector output. This output is still
available on test point TP17.
© 1996 Consumer Microcircuits Limited
Figure 4 FX602 Configuration
11
UM6020/4