MT3170B/71B, MT3270B/71B, MT3370B/71B
AC Electrical Characteristics
- voltages are with respect to V
DD
=5V±5%, V
SS
=0V and temperature -40 to +85°C unless
otherwise stated.
Characteristics
1
2
3
4
5
6
7
8
9
10
11
12
Valid input signal level
(each tone of composite signal)
Positive twist accept
Negative twist accept
Frequency deviation accept
Frequency deviation reject
Third tone tolerance
Noise tolerance
Dial tone tolerance
Supervisory tones detect level
(Total power)
Supervisory tones reject level
Energy detector attack time
Energy detector decay time
Sym
Min
-50
2.45
Typ
‡
Max
0
775
8
8
Units
dBm
mV
RMS
dB
dB
Test Conditions*
1,2,3,5,6,12
1,2,3,4,11,12,15
1,2,3,4,11,12,15
1,2,3,5,12
1,2,3,5,12,15
±
1.5
%±
2Hz
-16
-12
+15
dB
dB
dB
dBm
-50
dBm
ms
ms
ms
ms
ms
ms
ms
ms
ms
40
ms
ms
1.0
100
3.0
140
MHz
ns
ns
±
3.5
%
1,2,3,4,5,12
7,9,12
8,10,12
16
16
16
16
IDDQ
≤
100µA
MT3170B/3370B
MT3171B/3371B
Note 14
MT3x70B
MT3x70B
MT3x71B
MT3x71B
MT3x71B
MT3x71B
13,15
1MHz f
ACK
,
13,15
13,15
-35
t
SA
t
SD
3
1.0
6.5
25
10
30
50
13a Powerdown time
13b Powerup time
14
15
16
17
18
19
20
21
22
Tone present detect time (ESt
logic output)
Tone absent detect time (ESt
logic output)
Tone duration accept
(DStD logic output)
Tone duration reject
(DStD logic output)
Interdigit pause accept (DStD
logic output)
Interdigit pause reject (DStD
logic output)
Data shift rate 40-60% duty cycle
Propagation delay
(ACK to Data Bit)
Data hold time (ACK to SD)
t
DP
t
DA
t
REC
t
REC
t
ID
t
DO
f
ACK
t
PAD
t
DH
3
13
3
20
15
40
20
20
30
50
‡ Typical figures are at 25 °C and are for design aid only: not guaranteed and not subject to production testing
* Test Conditions
1. dBm refers to a reference power of 1 mW delivered into a 600 ohms load.
2. Data sequence consists of all DTMF digits.
3. Tone on = 40 ms, tone off = 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 (0-3 kHz) Gaussian noise.
8. Precise dial tone frequencies are 350 Hz and 440 Hz (± 2%).
9. Referenced to lowest level frequency component in DTMF signal.
10. Referenced to the minimum valid accept level.
11. Both tones must be within valid input signal range.
12. External guard time for MT3x70B = 20ms.
13. Timing parameters are measured with 70pF load at SD output.
14. Time duration between PWDN pin changes from ‘1‘ to ‘0‘ and ESt/DStD becomes active.
15. Guaranteed by design and characterization. Not subject to production testing.
16. Value measured with an applied tone of 450 Hz.
4-9
MITEL [ MITEL NETWORKS CORPORATION ]
