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Chapter 9
285
AUDIO OUT
This port is used to output signals from audio frequency generators 1 and 2.
Operating Considerations
The output level is set by the AF generators and is not affected by the front-panel
VOLUME control.
Output impedance <1 Ω
Maximum output current = 20 mA peak
Maximum reverse voltage = 12 V peak
AC/DC coupling is selected using the Audio Out field. This field is available on the RF
GENERATOR screen.
BASEBAND OUT (I and Q)
These outputs provide buffered versions of the I and Q drive signals.
Operating Considerations
The I and Q drive signals are balanced by DACs that provide the correct dc offset for the
I/Q modulator.
Output impedance = 50 Ω
Nominal output level = 250 mV (open circuit)
Frequency = approximately 600 kHz
Chassis Ground
The chassis ground terminal provides a general chassis connection.
CHIP CLOCK 1.2288 MHz OUT
This output provides a 1.2288 MHz (CDMA chip rate) square wave with a 50% duty
cycle. This signal comes from the CDMA frame clocks.
Operating Considerations
Nominal output level = TTL
Output impedance = 50 Ω