MT3170 MITEL [Mitel Networks Corporation], MT3170 Datasheet - Page 8

• Manufacturer Part Number: MT3170
• Description: Wide Dynamic Range DTMF Receiver
• Manufacturer: MITEL [Mitel Networks Corporation]

MT3170B/71B, MT3270B/71B, MT3370B/71B
4-10
INPUT
ESt
(MT3x70B)
DStD
(MT3x71B)
ACK
SD
t
t
t
t
t
t
t
t
ESt/DStD
ACK
SD
DO
ID
REC
REC
DA
DP
SA
SD
- maximum allowable dropout during valid DTMF signals. (MT3x7xB).
- minimum time between valid DTMF signals (MT3x71B).
- maximum DTMF signal duration not detected as valid (MT3x7xB).
- minimum DTMF signal duration required for valid recognition (MT3x71B).
- time to detect the absence of valid DTMF signals (MT3x70B).
- time to detect the presence of valid DTMF signals (MT3x70B).
- supervisory tone integrator attack time (MT3x7xB).
- supervisory tone integrator decay time (MT3x7xB).
V
V
V
V
IH
IL
IH
IL
DTMF Energy
Detect
t
t
REC
DP
Tone #n
LSB
DTMF
b
0
b
1
b
2
MSB
b
3
t
PAD
t
t
1/
DA
ID
f
ACK
LSB
b
0
t
REC
Figure 5 - ACK to SD Timing
Figure 4 - Timing Diagram
b
1
Tone #n + 1
DTMF
LSB
b
0
b
1
t
b
DO
b
MSB
2
2
b
3
DTMF
#n + 1
Tone
t
MSB
SA
b
3
t
DH
Signal
Envelope
Input
Signal
Input
DTMF Energy
Detect
t
SD