4
DS241RD1C1
CRD4610-1
CrystalClear™ AC '97 Motherboard Reference Design
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
Mic In
The Microphone In 1/8" jack provides an input to a
microphone preamplifier circuit that provides
17 dB of gain.
•
Maximum input level:
-
Microphone Boost enabled: 12.7 mV
-
Microphone Boost disabled: 127 mV
•
Supports 3-pin phantom power and dynamic
microphones
•
Microphone power is provided on the ring con-
nection of the 1/8" stereo jack
Line In
The Line In 1/8" jack provides an input to the Line
In pins of the CS4297.
•
Maximum input level: 2 Vrms
CD ROM In
The CD ROM input header is a 4 pin (0.08 inch
center) shrouded connector that fits most CD ROM
audio adapter cables.
•
Maximum input level: 2 Vrms
•
Differential input using the CD common pin as
the ground
Modem Audio Connection
The modem audio connection can either be made
through the external 1/8" jack or the internal 4-pin
(0.1 inch center) header. These connectors have
both an input and an output on them.
External 1/8" jack:
•
Ring connection: Mono input
-
Maximum input level: 1 Vrms
•
Tip connection: Mono output
-
Maximum output level: 0.7 Vrms
Headphone Out or Headset
An external 1/8" jack is provided for a headphone
or headset connection. The card comes configured
for headphone operation with the selection being
made by a 0
Ω
resistor population option. The
headphone option is selected by populating R24
and R26 and not populating R25. The headset op-
tion is selected when R25 is populated and R24 and
R26 are not populated.
Headphone output option:
•
Capable of driving low impedance loads such
as 32
Ω
headphones
•
Maximum output level: 1.4 Vrms
Headset option:
Ring connection: Right headphone output
•
Maximum output level: 1.4 Vrms
Tip connection: Microphone 2 input
•
Maximum input level:
-
Microphone Boost enabled: 12.7 mV
-
Microphone Boost disabled: 127 mV
•
Microphone power is provided on the tip con-
nection. This setup supports phantom power
mics only (not dynamic mics)
Aux In
•
Internal 4 pin header (0.1 inch center)
•
Maximum input level: 2 Vrms
Video In
•
Internal 4 pin header (0.1 inch center)
•
Maximum input level: 2 Vrms
PC Speaker
•
Internal 2 pin header (0.1 inch center)
•
Mono input for the internal PC speaker output
Summary of Contents for CRD4610-1
Page 30: ......
