MT3170 datasheet(8/8 Pages) MITEL

8 / 8 page

MT3170B/71B, MT3270B/71B, MT3370B/71B

4-10

Figure 4 - Timing Diagram

Figure 5 - ACK to SD Timing

INPUT

ESt

(MT3x70B)

DStD

(MT3x71B)

ACK

DTMF

Tone #n

tDP

tREC

tDO

DTMF

Tone #n + 1

DTMF

Tone

#n + 1

Input

Signal

tDA

tREC

tID

LSB

MSB

b0b1b2b3

tSA

tSD

Input

Signal

Envelope

LSB

MSB

tDO

tID

- maximum allowable dropout during valid DTMF signals. (MT3x7xB).

tREC

tDA

tDP

tSA

tSD

- 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).

ESt/DStD

ACK

VIH

VIL

VIH

VIL

1/fACK

tPAD

tDH

MSB

DTMF Energy

Detect

LSB

DTMF Energy

Detect

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