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73M2901/5V
Advanced Single
Chip Modem
6
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 (475W resistor), transformer, and solid state off-hook relay.