MSM6946RS Просмотр технического описания (PDF) - Oki Electric Industry

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MSM6946RS

300 bps Single Chip FSK MODEM

Oki Electric Industry 

¡ Semiconductor

MSM6926/6946

2. MSM6946

Transmit carrier out (AO)

Parameter

ORIGINATE MODE

Carrier Frequency

ANSWER MODE

Carrier Frequency

Output Resistance

Load Resistance

Load Capacitance

Transmit Level

Output Offset Voltage

Symbol

Mark

1

fOM

Space

0

fOS

Mark

1

fAM

Space

0

fAS

ROXA

RLXA

CLXA

VOXA

VOSX

Out-of-Band Energy

(Referred to Carrier Level)

EOX

(VA = 12 V ±10%, VD = 5 V ±5%, Ta = 0 to 70°C)

Condition

Min. Typ. Max. Unit

1264 1270 1276

fCRYSTAL = 3.579545 MHz

1064

2219

1070

2225

1076

Hz

2231

—

—

—

—

—

C1 = 0.047 mF

2019 2025 2031

—

—

200 W

50

—

— kW

—

—

100 pF

4

6

8 *1 dBm

VA

2

–1

VA

2

VA

2

+1

V

Refer to Fig. 4

dB

Receive carrier input (AIN)

Parameter

Symbol

Input Resistance

RIRA

Receive Signal Level Range

VIRA

Carrier Detect Level

ON VCD ON

OFF VCD OFF

Carrier Detect Hysteresis

HYS

Condition

—

—

R8 = 33 kW *2

R9 = 51 kW

VCD ON – VCD OFF

Min.

100

–48

—

–48

1.5

Typ.

—

—

—

—

—

Max. Unit

— kW

–6

–43 *1 dBm

—

—

dB

Receive Filter

Parameter

Group Delay Distortion

Adjacent Channel Rejection

Symbol

Condition

ORIG. 1975 to 2275 Hz

MODE

DDL

ANS.

MODE

1020 to 1320 Hz

LAC

VAIN = –6 dBm

Notes: *1 0 dBm = 0.775 Vrms

*2 The resistor values are typical

Min.

—

—

50

Typ.

650

750

—

Max. Unit

—

ms

—

—

dB

13/25

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