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參數(shù)資料
| 型號： | WM8722 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs |
| 中文描述： | 立體聲DAC，具有集成的音調(diào)發(fā)生器和線/變平輸出 |
| 文件頁數(shù)： | 5/23頁 |
| 文件大?。?/td> | 438K |
| 代理商： | WM8722 |
Advanced Information
WM8722
WOLFSON MICROELECTRONICS LTD
AI Rev 1.5 May 2000
5
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, T
A
= +25
o
C, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
Gain mismatch
Frequency Bandwidth
Master volume max gain
Master volume min gain
Master volume step size,
codes 0 - 47
Master volume step size,
codes 48
–
79
Master volume gain code
80
–
127 (mute)
Mixer trim max gain
Mixer trim min gain
Mixer trim step size
Tone Generator
SINAD
(Note 3)
SINAD
SINAD
SINAD
SYMBOL
TEST CONDITIONS
Channel to channel
0dB gain
MIN
TYP
+/-1%
100
6
-73
1
MAX
+/-5%
UNIT
% of FSR
kHz
dB
dB
dB
5
7
-70
0.7
-76
1.3
0.5
1
1.5
dB
-90
-100
dB
11
12
13
dB
dB
dB
-32.5
1.3
-34.5
1.5
-36.5
1.7
1Hz to 1kHz tones
1kHz to 2kHz tones
2kHz to 4kHz tones
4kHz to 32kHz tones
65
60
55
50
75
70
65
60
dB
dB
dB
dB
Full scale output voltage;
trims at
Tone Frequency
Tone Duration
Gain adjust range
Gain adjust step size (4
bit trim)
0dB
2.5
V pk-pk
TCLK frequency = 27MHz
TCLK frequency = 27MHz
1
32767
25.5
0
1.75
Hz
secs
dB
dB
0.1
-46.5
1.25
1.5
Notes:
1.
Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured
‘
A
’
weighted over a 20Hz to 20kHz bandwidth.
2.
All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher
THD+N and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low
pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.
3.
SINAD is ratio of signal to sum of noise, harmonics and spurii, over a bandwidth from 1Hz up to either 127x the
tone frequency, or 20kHz, whichever is the lower. (This is to allow for the lower frequency tones having images
at 127x and 129x the tone frequency which will fall in the audio band for tones of frequency less than about
20kHz/128).
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