MC145745FW 查看數據表（PDF） - Motorola => Freescale

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MC145745FW

V.21/V.23 Telemeter Modem

Motorola => Freescale 

AC ELECTRICAL CHARACTERISTICS

(VCC = + 3.6 V ± 0.3 V, TA = – 30 to + 85_C)

TRANSMIT CARRIER CHARACTERISTICS

Characteristic

Symbol

V.21 Carrier Frequency

Originate Mode

V.21 Carrier Frequency

Answer Mode

V.23 Carrier Frequency

Mark “1”

f1M

Space “0” f1S

Mark “1”

f2M

Space “0” f2S

Mark “1”

f1M

Space “0” f1S

Transmit Carrier Level

VO

Secondary Harmonic Level

V2h

Out–of–Band Level

VOE

Conditions

Oscillation Frequency:

3.579545 MHz (X2)

or 7.159090 MHz (ECLK)

Transmit Attenuator = 0 dB

RTLA = 0, RL = 1.2 kΩ

VTxA1 – VTxA2

Min

974

1174

1644

1844

1294

2094

—

—

Typ

980

1180

1650

1850

1300

2100

4

– 40

Refer to Figure 1

Max

986

1186

1656

1856

1306

2106

—

—

TRANSMIT ATTENUATOR CHARACTERISTICS

Characteristic

Symbol

Attenuation Range

Attenuator Accuracy

1 – 5 dB

6 – 9 dB

10 – 15 dB

Conditions

Min

Typ

Max

0

—

15

– 0.5

—

0.5

–1

—

1

– 1.7

—

1

RECEIVER CHARACTERISTICS (Includes Hybrid, Demodulator, and Carrier Detector)

Characteristic

Symbol

Conditions

Min

Typ

Max

Input Resistance

RIRX

50

500

—

Receive Carrier Amplitude

VIRX

– 48

—

– 12

Carrier Detection

Threshold

OFF to ON

ON to OFF

Hysteresis (VCDON – VCDOFF)

VCDON

VCDOFF

HYS

CDA = 1.25 V

fin = 1.0 kHz

BR3 (b1) = 1

—

– 44

—

—

– 47

—

2

—

—

Carrier Detection Timing OFF to ON TCDON CD1 = 0, CD0 = 0, CD Pin

—

450

—

CD1 = 0, CD0 = 1, CD Pin

—

15

—

CD1 = 1, CD0 = 0, CD Pin

—

15

—

CD1 = 1, CD0 = 1, CD Pin

—

75

—

ON to OFF TCDOFF CD1 = 0, CD0 = 0, CD Pin

—

30

—

CD1 = 0, CD0 = 1, CD Pin

—

30

—

CD1 = 1, CD0 = 0, CD Pin

—

15

—

CD1 = 1, CD0 = 1, CD Pin

—

10

—

CPTD CHARACTERISTICS

Characteristic

Symbol

Conditions

BPF Center Frequency

BPF Pass–Band Lower Cut–Off

Frequency

fc

fi

– 3 dB

BPF Pass–Band Upper Cut–Off

Frequency

fh

– 3 dB

CPT Detection Level

CPT Detection Timing

VTD ON

VTD OFF

TTD ON

TTD OFF

VTDON

VTDOFF

TTDON

TTDOFF

CDA = 1.25 V

fin = 400 Hz

BR3 (b1) = 1

Min

Typ

Max

—

400

—

—

330

—

—

470

—

—

– 44

—

—

– 47

—

—

10

—

—

25

—

Unit

Hz

dBm

dB

dBm

Unit

dB

dB

Unit

kΩ

dBm

dBm

dB

ms

Unit

Hz

Hz

Hz

dBm

ms

MOTOROLA

MC145745

5

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