MT3371BN Просмотр технического описания (PDF) - Mitel Networks
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MT3371BN Datasheet PDF : 11 Pages
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MT3170B/71B, MT3270B/71B, MT3370B/71B
AC Electrical Characteristics - voltages are with respect to VDD=5V±5%, VSS=0V and temperature -40 to +85°C unless
otherwise stated.
Characteristics
Sym
Min
Typ‡ Max
Units Test Conditions*
1 Valid input signal level
-50
(each tone of composite signal)
2.45
2 Positive twist accept
0
dBm 1,2,3,5,6,12
775
mVRMS
8
dB 1,2,3,4,11,12,15
3 Negative twist accept
8
dB 1,2,3,4,11,12,15
4 Frequency deviation accept
±1.5%± 2Hz
1,2,3,5,12
5 Frequency deviation reject
±3.5%
1,2,3,5,12,15
6 Third tone tolerance
-16
dB 1,2,3,4,5,12
7 Noise tolerance
-12
dB 7,9,12
8 Dial tone tolerance
+15
dB 8,10,12
9 Supervisory tones detect level
-35
(Total power)
dBm 16
10 Supervisory tones reject level
-50
dBm 16
11 Energy detector attack time
12 Energy detector decay time
13a Powerdown time
13b Powerup time
tSA
1.0
6.5
ms 16
tSD
3
25
ms 16
10
ms IDDQ ≤ 100µA
30
ms MT3170B/3370B
50
ms MT3171B/3371B
Note 14
14 Tone present detect time (ESt
tDP
3
13
20
ms MT3x70B
logic output)
15 Tone absent detect time (ESt
tDA
logic output)
3
15
ms MT3x70B
16 Tone duration accept
tREC
(DStD logic output)
40
ms MT3x71B
17 Tone duration reject
(DStD logic output)
tREC
20
ms MT3x71B
18 Interdigit pause accept (DStD
tID
logic output)
40
ms MT3x71B
19 Interdigit pause reject (DStD
tDO
20
logic output)
ms MT3x71B
20 Data shift rate 40-60% duty cycle fACK
21 Propagation delay
tPAD
(ACK to Data Bit)
1.0
3.0
100
140
MHz
ns
13,15
1MHz fACK,
13,15
22 Data hold time (ACK to SD)
tDH
30
50
ns 13,15
‡ 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
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