MC145740F Ver la hoja de datos (PDF) - Motorola => Freescale

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MC145740F

Dual Tone Multiple Frequency Line Interface

Motorola => Freescale 

AC ELECTRICAL CHARACTERISTICS

DTMF TRANSMIT CHARACTERISTICS (VCC = 5 V ± 10%, TA = – 20 to 70°C)

Parameter

Symbol

Condition

Min

Typ

Transmit Level

Low Group

Vfl

Attenuator = 0 dB

—

2.5

High Group

Vfh

fosc = 3.579545 MHz

VTxA1 – VTxA2

—

3.5

High Group Pre–Emphasis

PE

RL = 1.2 kΩ

0

—

DTMF Distortion

DIST

—

5

DTMF Frequency Variation

∆fV

–1

—

Out–of–Band Energy

(See Figure 1)

VOE

—

—

Setup Time

tosc

—

4

TRANSMIT ATTENUATOR CHARACTERISTICS (VCC = 5 V ± 10%, TA = – 20 to 70°C)

Parameter

Symbol

Condition

Min

Typ

Attenuator Range

ARNG

0

—

Attenuator Accuracy

AACC

1 dB – 5 dB

– 0.5

—

6 dB – 9 dB

–1

—

10 dB – 15 dB

– 1.7

—

DTMF RECEIVER CHARACTERISTICS (VCC = 5 V ± 10%, TA = – 20 to 70°C)

Parameter

Symbol

Condition

Min

Typ

Input Impedance

RIDTMF

50

—

Detect Signal Level (Each Tone)

– 48

—

Twist (High Group/Low Group)

– 10

—

Frequency Detect Band Width

See Figure 3

± 1.5% ± 2 Hz

—

Frequency Reject Band Width

—

—

DTMF Detect Timing OFF to ON

(See Figure 2)

TVDON

CD1 = 0, CD0 = 1

CD1 = 1, CD0 = 0

—

20

—

30

CD1 = 1, CD0 = 1

—

40

ON to OFF

TVDOFF

CD1 = 0, CD0 = 1

CD1 = 1, CD0 = 0

—

20

—

30

CD1 = 1, CD0 = 1

—

20

Max

Unit

—

dBm

—

3

dB

—

%

1

%

—

—

ms

Max

Unit

15

dB

0.5

dB

1

1

Max

—

0

10

—

± 3.5

—

—

—

—

—

—

Unit

kΩ

dBm

dB

% fc

ms

MOTOROLA

MC145740

3

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