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MC145745FW

V.21/V.23 Telemeter Modem

Motorola => Freescale 

DTMF TRANSMIT CHARACTERISTICS

Characteristic

Symbol

Tone Output Level

Low Group

Vfl

High Group

Vfh

High Group Pre–Emphasis

PE

DTMF Distortion

DIST

DTMF Frequency Deviation

∆fV

Out–of–Band Level

Setup Time

VOE

tosc

Conditions

Transmit Attenuator = 0 dB

RTLA = 0 Ω

fosc = 3.579545 MHz

Single Tone Mode

RL = 1.2 kΩ

VTxA1 – VTxA2

DTMF RECEIVER CHARACTERISTICS

Characteristic

Symbol

Conditions

Input Resistance

Detection Signal Level (Each Tone)

BR3 = (0, 0, 1, 0)

Twist (High/Low Group)

Frequency Detection Band Width

(Figure 3)

Frequency Non–Detection Band Width

(Figure 3)

DTMF Detection Timing

(Figure 2)

OFF to ON TDVON CD1 = 0 , CD0 = 0

Delay

CD1 = 0 , CD0 = 1

CD1 = 1 , CD0 = 0

ON to OFF TDVOFF CD1 = 0 , CD0 = 0

Delay

CD1 = 0 , CD0 = 1

CD1 = 1 , CD0 = 0

Min

Typ

Max

—

0

—

—

1

—

0

—

3

—

5

—

–1

—

1

Refer to Figure 1

—

4

—

Min

Typ

50

500

– 48

—

– 10

—

1.5% + 2 Hz

—

– 1.5% – 2Hz

—

—

—

—

30

—

35

—

45

—

25

—

35

—

25

Max

—

0

10

—

—

± 3.5%

—

—

—

—

—

—

DEMODULATOR CHARACTERISTICS

Characteristic

Symbol

Conditions

V.21 Bit Bias

Receive Level = – 24 dBm

S/N = 4 dB

V.23 Bit Bias

Receive Level = – 24 dBm

S/N = 14 dB

V.21 Bit Error Rate

Receive Level = – 24 dBm

S/N = 4 dB

511–Bit Pattern

V.23 Bit Error Rate

Receive Level = – 24 dBm

S/N = 14 dB

511–Bit Pattern

Min

Typ

Max

—

5

—

—

10

—

—

0.00001

—

—

0.00001

—

Unit

dBm

dBm

dB

%

%

dB

ms

Unit

kΩ

dBm

dB

ms

Unit

%

%

MC145745

6

MOTOROLA

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