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PDF MV5087 Data sheet ( Hoja de datos )
| Número de pieza | MV5087 | |
| Descripción | DTMF GENERATOR | |
| Fabricantes | GEC Plessey | |
| Logotipo |  |
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MV5087
OUTPUT FREQUENCY
Table 1 shows the output frequency deviation from the
standard DTMF frequencies when a 3.58MHz crystal is used
as the reference.
The row and column output waveforms are digitally
synthesised using R-2R D-to-A converters (see Fig.6),
resulting in a ‘staircase’ approximation to a sinewave. An
opamp mixes these tones to produce a dual-tone waveform.
Single tone distortion is typically better than 7% and all
distortion components of the mixed dual-tone should be 30dB
relative to the strongest fundamental (column tone).
Standard
DTMF
(Hz)
Row
Column
f1 697
f2 770
f3 852
f4 941
f5 1209
f6 1336
f7 1477
f8 1633
Tone Output
Frequency Using
3.5795545 MHz
Crystal
701.3
771.4
857.2
935.1
1215.9
1331.7
1471.9
1645.0
% Deviation
from Standard
+0.62
+0.19
+0.61
-0.63
+0.57
-0.32
-0.35
+0.73
Low
Group
High
Group
Table 1: Output frequency deviation
VOUT
a)
VOUT
t
b)
t
Figure 6: Typical sinewave output (a) Row tones (b) Column tones
DISTORTION MEASUREMENTS
THD for the single tone is defined by:
100 (
V2 + V2 + V2 + ---- V2 ) %
2f 3f 4f
nf
V fundamental
Where V2f --- Vnf are the Fourier components of the waveform.
THD for the dual tone is defined by:
100 (
V2 + V2 + V2 + V2 + V2 --- V2 + V2 )
2R 3R nR 2C 3C
nc IMD
V2 + V2
ROW
COL
where
VROW is the row fundamental amplitude
VCOL is the column fundamental amplitude
V2R—VnR are the Fourier component amplitudes of the row frequencies
V2C—VnC are the Fourier component amplitudes of the column frequencies
VIMD is the sum of all intermodulation components.
4
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