ZL49010/11, ZL49020/21, ZL49030/31

Data Sheet

10

Zarlink Semiconductor Inc.

Figure 4 - Timing Diagram

INPUT

ESt

(ZL490x0)

DStD

(ZL490x1)

ACK

SD

DTMF

Tone #n

DTMF

Tone #n + 1

DTMF

Tone

#n + 1

Input

Signal

LSB

MSB

Input

Signal

Envelope

LSB

MSB

- maximum allowable dropout during valid DTMF signals. ZL490xx).

- minimum time between valid DTMF signals (ZL49011).

- maximum DTMF signal duration not detected as valid (ZL490xx).

- minimum DTMF signal duration required for valid recognition (ZL490x1).

- time to detect the absence of valid DTMF signals (ZL490x0).

- time to detect the presence of valid DTMF signals (ZL490x0).

- supervisory tone integrator attack time (ZL490xx).

- supervisory tone integrator decay time (ZL490xx).