PCI 8CH Integrated Sound Chip
CMI8768 Datasheet Rev 1.0
6.6 Analog Performance
The measurements are performed under the circumstance as:
Tambient = 25:, AVdd = 5.0V ? 5%, DVdd = 3.3V ? 5%, 10k?/50pF external load. Input is 1
kHz sine wave; Sampling frequency = 48 kHz; Bandwidth = 20 to 20 kHz; 0dB attenuation;
All sound effects such as 3D effects are disabled.
Parameter Minimum Typical Maximum Units
Full Scale Input Voltage:
Line Inputs (Mixer) - 1.1 1.25 Vrms
Line Inputs (A/D) - - 1.25 Vrms
Vrms
Mic Inputs (20dB boost) - 0.1 1.25
Full Scale Output Voltage:
Front_Out - 1.1 - Vrms
Side_Surround_Out - 1.1 - Vrms
Center / LFE_out - 1.1 - Vrms
Back_Surround_Out - 1.1 - Vrms
SNR (Idle) -
A/A - 100 - dB
D/A - 101 - dB
dB
A/D - 86 -
Dynamic Range (-60dB)
A/A - 100 - dB
D/A - 94 - dB
dB
A/D - 85 -
THD+N
A/A - 0.005 - %
D/A - 0.017 - %
A/D - 0.015 - %
Frequency Response
A/A 5 - 22,000 Hz
D/A 5 - 22,000 Hz
A/D 10 - 22,000 Hz
Cross-talk @ 10KHz (A/A) - 100 - dB
Transition Band 19,200 28,800 Hz
Stop Band 28,800 Hz
Stop Band Rejection - -70 - dB
Out-Of-Band Rejection - -65 - dB
Power Supply Rejection Ratio - -65 - dB
Master Volume Gain (32 steps)
Step Size 1.5 dB
Control Range -54 - +6 dB
Analog Input Gain (16 steps)
Step Size 2 dB
Control Range -30 - 0 dB
Mic Input Gain (16 steps)
Step Size 3 dB
Control Range -22 - +24 dB
Mic Boost Gain - +20 - dB
PCSPK Input Gain (4 steps)
Step Size 8 dB
Control Range -24 - 0 dB
Recording Gain (16 steps)
Step Size 1.5 dB
Control Range 0 - +22.5 dB
Input Impedance
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