MT88L70
Data Sheet
AC Electrical Characteristics
- V
DD
= 3.0 V +20%/-10%, V
SS
= 0 V, -40
°
C
≤
T
O
≤
+85
°
C, using Test Circuit shown in Fig. 6.
Characteristics
1
Valid input signal levels
(each tone of composite
signal)
Negative twist accept
Positive twist accept
Frequency deviation accept
Frequency deviation reject
Third zone tolerance
Noise tolerance
±1.5% ±
2 Hz
±3.5%
-16
-12
dB
dB
Sym
Min.
-34
15.4
Typ
‡
Max
-4.0
489
8
8
Units
dBm
mV
RMS
dB
dB
Notes*
1,2,3,5,6,9
Min @ V
DD
=3.6 V
Max @ V
DD
=2.7 V
2,3,6,9,12
2,3,6,9,12
2,3,5,9
2,3,5,9
2,3,4,5,9,10
2,3,4,5,7,9,10
2,3,4,5,8,9,11
2
3
4
5
6
7
8
‡
Dial zone tolerance
+22
dB
Typical figures are at 25
°
C and are for design aid only: not guaranteed and not subject to production testing.
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%
±
2 Hz.
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.
*
NOTES
10
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
