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MV5089 Datasheet(PDF) 3 Page - Zarlink Semiconductor Inc |
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MV5089 Datasheet(HTML) 3 Page - Zarlink Semiconductor Inc |
3 / 7 page MV5089 2 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.3), resulting in staircase approximations 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). DISTORTION MEASUREMENTS THD for the single tone is defined by: Tone Output Frequency Using 3.5795545 MHz Crystal Standard DTMF (Hz) f1 697 f2 770 f3 852 f4 941 f5 1209 f6 1336 f7 1477 f8 1633 % Deviation from Standard +0.62 +0.19 +0.61 -0.63 +0.57 -0.32 -0.35 +0.73 701.3 771.4 857.2 935.1 1215.9 1331.7 1471.9 1645.0 Column Row High Group Low Group Table 1: Output frequency deviation 100 ( V2 + V2 + V2 + ---- V2 ) % 2f 3f 4f nf V fundamental 100 ( V2 + V2 + V2 + V2 + V2 --- V2 + V2 ) 2R 3R nR Where V2f --- Vnf are the Fourier components of the waveform. THD for the dual tone is defined by: 2C 3C nc IMD 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. Figure 3: Typical sinewave output (a) Row tones (b) Column tones COL V2 + V2 ROW V OUT V OUT t t a) b) |
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