MT8870D/MT8870D-1
Typ.
‡
Data Sheet
MT8870D AC Electrical Characteristics
-V
DD
=5.0V
±
5%, V
SS
=0V, -40°C
≤
T
O
≤
+85°C, using Test Circuit shown in Figure 10.
Characteristics
1
2
3
4
5
6
7
8
Valid input signal levels (each
tone of composite signal)
Negative twist accept
Positive twist accept
Frequency deviation accept
Frequency deviation reject
Third tone tolerance
Noise tolerance
Dial tone tolerance
±1.5% ±
2 Hz
±3.5%
-16
-12
+22
dB
dB
dB
Sym.
Min.
-29
27.5
Max.
+1
869
8
8
Units
dBm
mV
RMS
dB
dB
Notes*
1,2,3,5,6,9
1,2,3,5,6,9
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
‡ 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
12
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
