MSM7524 datasheet(13/21 Pages) OKI

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¡ Semiconductor

MSM7524

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DTMF Receiver

Figure 6 DTMF Receiver Timing

PBI

D4 to D1

tREJDT

tDETDT

tDELDT

tHOLDT

tPAUDT

tCYCDT

tBRKDT

(VDD = +5 V ±10%, Ta = –25°C to 85°C)

Unit

Max.

Typ.

Min.

Condition

Symbol

Parameter

Detect Amplitude

dBm

—

–40

VDETDT

fIN : Nominal

Frequency ±1.5%, at GS1

Non-detect Amplitude

dBm

–60

—

VREJDT

Time to Detect

—

tDETDT

Detect

Time to Reject

—

tREJFDT

Non-detect

Interdigit Pause

—

tPAUDT

Acceptable Drop Out

—

tBRKDT

Refer to Fig. 6.

Detect Delay Time

tDELDT

Detect Frequency

±1.5

—

fDETDT

To Nominal Frequency

Non-detect Frequency

—

±3.8

fREJDT

VHigh Group–VLow Group

+6.0

—

–6.0

Level Twist

VTWIST

N : 0.3 to 3.4 kHz

—

–12

—

Noise to Signal Ratio (N/S)

VN/S

350 to 480 Hz

—

Dial Tone Rejection Ratio

VREJ

—

120

Signal Repetition Time

tCYCDT

Detect Hold Time

tHOLDT

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