MT3270BE1 データシートの表示（PDF） - Zarlink Semiconductor Inc

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MT3270BE1

Wide Dynamic Range DTMF Receiver

Zarlink Semiconductor Inc 

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

INPUT

DTMF

Tone #n

tDP

ESt

(MT3x70B)

tREC

DStD

(MT3x71B)

tREC

tDA

tID

tDO

DTMF

Tone #n + 1

DTMF

Tone

#n + 1

Data Sheet

Input

Signal

ACK

LSB MSB

SD

LSB MSB

b0b1b2b3

b0b1b2b3

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

tID - minimum time between valid DTMF signals (MT3x71B).

tREC - maximum DTMF signal duration not detected as valid (MT3x7xB).

tREC - minimum DTMF signal duration required for valid recognition (MT3x71B).

tDA - time to detect the absence of valid DTMF signals (MT3x70B).

tDP - time to detect the presence of valid DTMF signals (MT3x70B).

tSA - supervisory tone integrator attack time (MT3x7xB).

tSD - supervisory tone integrator decay time (MT3x7xB).

Figure 4 - Timing Diagram

tSA

tSD

Input

Signal

Envelope

ESt/DStD

VIH

ACK VIL

SD

VIH

VIL

DTMF Energy

Detect

1/fACK

tPAD

b0

b1

b2

LSB

Figure 5 - ACK to SD Timing

tDH

b3

MSB

DTMF Energy

Detect

11

Zarlink Semiconductor Inc.

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