MT8888CN View Datasheet(PDF) - Zarlink Semiconductor Inc

Part Name

Description

Manufacturer

MT8888CN

Integrated DTMF Transceiver with Intel Micro Interface

Zarlink Semiconductor Inc 

MT8888C

Data Sheet

receiver will tolerate signal interruptions (drop out) too short to be considered a valid pause. This facility, together

with the capability of selecting the steering time constants externally, allows the designer to tailor performance to

meet a wide variety of system requirements.

VDD

MT8888C

VDD

St/GT

ESt

C1

Vc

R1

tGTA = (R1C1) In (VDD / VTSt)

tGTP = (R1C1) In [VDD / (VDD-VTSt)]

Figure 5 - Basic Steering Circuit

5.0 Guard Time Adjustment

The simple steering circuit shown in Figure 5 is adequate for most applications. Component values are chosen

according to the following inequalities (see Figure 7):

tREC ≥ tDPmax+tGTPmax - tDAmin

tREC ≤ tDPmin+tGTPmin - tDAmax

tID ≥ tDAmax+tGTAmax - tDPmin

tDO ≤ tDAmin+tGTAmin - tDPmax

6

Zarlink Semiconductor Inc.

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