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ESM-2740/2743
32 ESM-2740/2743 User’s Manual
2.4.3.2 Audio Signals
Signal Signal Description
SNDL/ SNDR
Line-level stereo output left/ right. These outputs have a nominal level of 1 volt
RMS into a 10K impedance load. These outputs cannot drive low-impedance
speakers directly.
AUXAL/ AUXAR
Auxiliary A input left/ right. Normally intended for connection to an internal or
external CDROM analog output or a similar line-level audio source. Minimum input
impedance is 5KOhm.
Nominal input level is 1 volt RMS.
MIC
Microphone input. Minimum input impedance is 5KOhm, max. Input voltage is 0.15
Vp-p.
ASGND
Analog ground for sound controller. Use this signal ground for an external amplifier
in order to achieve lowest audio noise levels.
ASVCC
Analog supply voltage for sound controller. This is an output which is used for
production test only. Do not make external connections to this pin.
2.4.3.3 USB Signals
Signal Signal Description
USB [0:3]
Universal Serial Bus Port [0:3] positive signal.
These are the serial data pairs for USB Port N-and Port N#.
USB [0:3]-
Universal Serial Bus Port [0:3] negative signal.
These are the serial data pairs for USB Port N-and Port N#.