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CM 108AH Highly Integrated USB Audio I/O Controller www .cmedia.com.tw Copyright© C-Media Electro nics Inc. R ev . 2.1 ︱ P age 24/27 9 Audio Quality G r a phs 9.1 Line Out Frequency Response @ 48KH z Sample Rate (10K Ohm…
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 23/27
8.3 Electrical Parameters
Min.
Typ.
Max.
Unit
DAC (10K Ohm Loading)
Resolution
-
16
-
Bits
THD + N (-3dBr)
-
-74.29
-
dB
SNR
-
93.6
-
dB
Silent SNR
-
98.2
-
dB
Dynamic range
-
93.8
-
dB
Frequency response 48KHz
20
-
20K
Hz
Frequency response 44.1KHz
20
-
20K
Hz
Output voltage (rms)
-
1.25
-
Vrms
Output voltage swing
0.5
-
4.0
V
DAC (32 Ohm loading)
Resolution
-
16
-
Bits
THD + N (-3dBr)
-
-71.1
-
dB
SNR
-
93.7
-
dB
Silent SNR
-
98.2
-
dB
Dynamic range
-
93.8
-
dB
Frequency response 48KHz
20
-
20K
Hz
Frequency response 44.1KHz
20
-
20K
Output voltage (rms)
-
1.25
-
Vrms
Output voltage swing
0.5
-
4.0
V
ADC
Resolution
-
16
-
bit
THD + N (-3dBr)
-
-76.1
-
dB
SNR
-
83.1
-
dB
Dynamic range
-
81.6
-
dB
Frequency response 48KHz
20
-
19.2K
Hz
Frequency response 44.1KHz
20
-
17.6K
Hz
Input range
0
-
2.88
Vpp
Amplification
Volume control level
-45
-
0
dB
Volume control step
-
38
-
Steps
Microphone Input
Boost gain
-
+22.5
-
dB
Gain adjustment range
0
-
22.5
dB
Gain adjustment steps
-
16
-
Steps
Mixer gain adjustment
-33.0
-
12.0
dB
Mixer gain adjustment steps
-
32
-
Steps
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 24/27
9 Audio Quality Graphs
9.1 Line Out Frequency Response @ 48KHz Sample Rate (10K Ohm Loading)
Audio Precision 09/26/08 14:33:51
Vista-Frequency Response-M48k.at27
ColorSweep Trace Line Style Thick Data Axis Comment
1 1 Cyan Solid 1 Fasttest.Ch.1 Ampl!Normalize Left
1 2 Yellow Solid 1 Fasttest.Ch.2 Ampl!Normalize Left
-6
+1
-5
-4
-3
-2
-1
+0
-3.143
-0.01
d
B
r
A
20 20k50 100 200 500 1k 2k 5k 10k
19.998k
Hz
dx=-19.980 kHz
dy=-3.132 dB
9.2 Line Out THD+N @ 48KHz sample rate (10K Ohm Loading)
Audio Precision 09/26/08 14:27:07
Vista-D-A THD+N.at27
ColorSweep Trace Line Style Thick Data Axis Comm ent
1 1 Cyan Solid 2 Anlr.THD+N Ampl Left
1 2 Yellow Solid 2 Anlr.THD+N Ampl Left
-120
+0
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
r
A
20 20k50 100 200 500 1k 2k 5k 10k
Hz
CM108AH
Highly Integrated USB Audio I/O Controller
www.cmedia.com.tw
Copyright© C-Media Electronics Inc. Rev. 2.1︱ Page 25/27
9.3 Microphone Input Frequency Response @ 48KHz Sample Rate
Audio Precision 09/26/08 14:52:45 A-D FREQUENCY RESPONSE
Vista-A-D Frequency Response.at2c
ColorSweep Trace Line Style Thick Data Axis Comment Cursor1
1 1 Yellow Solid 1 DSP Anlr.Level A Left *-2.812 dBFS
1 2 Cyan Solid 1 DSP Anlr.Level B Left -2.812 dBFS
-3
-1
-2.8
-2.6
-2.4
-2.2
-2
-1.8
-1.6
-1.4
-1.2
-2.812
-1.423
d
B
F
S
20 20k50 100 200 500 1k 2k 5k 10k
20k20
Hz
dx=-19.980 kHz
dy=+1.389 dB
9.4 Microphone Input THD+N @ 48KHz Sample Rate
Audio Precision 09/26/08 14:51:13 A-D THD+N vs FREQUENCY
Vista-A-D THD+N.at2c
ColorSweep Trace Line Style Thick Data Axis Comm ent
1 1 Yellow Solid 1 DSP Anlr.THD+N Ampl A Left
1 2 Cyan Solid 1 DSP Anlr.THD+N Ampl B Left
-120
+0
-100
-80
-60
-40
-20
d
B
F
S
20 20k50 100 200 500 1k 2k 5k 10k
Hz