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MT88L70ASR Datasheet(PDF) 10 Page - Zarlink Semiconductor Inc

Part # MT88L70ASR
Description  3 Volt Integrated DTMF Receiver
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Manufacturer  ZARLINK [Zarlink Semiconductor Inc]
Direct Link  http://www.zarlink.com
Logo ZARLINK - Zarlink Semiconductor Inc

MT88L70ASR Datasheet(HTML) 10 Page - Zarlink Semiconductor Inc

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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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