73M2901/5V データシートの表示（PDF） - TDK Corporation

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73M2901/5V

Advanced Single Chip Modem

TDK Corporation 

73M2901/5V

Advanced Single

Chip Modem

ELECTRICAL SPECIFICATIONS (continued)

MAXIMUM TRANSMIT LEVELS

Vref=2.25V; VPA=5.0V

Transmit type

Maximum differential line

level (dBm0)

QAM

-5.5

DPSK

-3.4

FSK

-1.2

DTMF (high tone)

-6.0

DTMF (low tone)

-8.0

DTMF (total)

-3.9

Vref=1.25V; VPA=5.0V

QAM

-9.6

DPSK

-7.4

FSK

-5.3

DTMF (high tone)

-7.9

DTMF (low tone)

-9.8

DTMF (total)

-5.7

Note: The recommended DAA (see the TDK 73M2901 Reference Manual) will result in approximately 8dB loss from the transmit pins to the

phone line. This includes the loss through the line matching impedance (475Ω resistor), transformer, and solid state off-hook relay.

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