Cirrus Logic CRD4610-1, Справочный проект

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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