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MT88L70ASR Datasheet(PDF) 10 Page - Zarlink Semiconductor Inc |
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MT88L70ASR Datasheet(HTML) 10 Page - Zarlink Semiconductor Inc |
10 / 16 page MT88L70 Data Sheet 10 Zarlink Semiconductor Inc. ‡ Typical figures are at 25 °C and are for design aid only: not guaranteed and not subject to production testing. *NOTES 1. dBm= decibels above or below a reference power of 1 mW into a 600 ohm load. 2. Digit sequence consists of all DTMF tones. 3. Tone duration= 40 ms, tone pause= 40 ms. 4. Signal condition consists of nominal DTMF frequencies. 5. Both tones in composite signal have an equal amplitude. 6. Tone pair is deviated by ±1.5%± 2Hz. 7. Bandwidth limited (3 kHz) Gaussian noise. 8. The precise dial tone frequencies are (350 Hz and 440 Hz) ± 2%. 9. For an error rate of better than 1 in 10,000. 10. Referenced to lowest level frequency component in DTMF signal. 11. Referenced to the minimum valid accept level. 12. Guaranteed by design and characterization. AC Electrical Characteristics - VDD = 3.0 V +20%/-10%, VSS = 0 V, -40°C ≤ TO ≤ +85°C, using Test Circuit shown in Fig. 6. Characteristics Sym Min. Typ‡ Max Units Notes* 1 Valid input signal levels (each tone of composite signal) -34 15.4 -4.0 489 dBm mVRMS 1,2,3,5,6,9 Min @ VDD=3.6 V Max @ VDD=2.7 V 2 Negative twist accept 8 dB 2,3,6,9,12 3 Positive twist accept 8 dB 2,3,6,9,12 4 Frequency deviation accept ±1.5% ± 2 Hz 2,3,5,9 5 Frequency deviation reject ±3.5% 2,3,5,9 6 Third zone tolerance -16 dB 2,3,4,5,9,10 7 Noise tolerance -12 dB 2,3,4,5,7,9,10 8 Dial zone tolerance +22 dB 2,3,4,5,8,9,11 |
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