WM8756 データシートの表示（PDF） - Wolfson Microelectronics plc
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WM8756 Datasheet PDF : 39 Pages
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WM8756
Advance Information
Test Conditions
AVDD = DVDD = 3V, AGND = 0V = DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP
MAX
SNR (Note 1,2,3)
Non ‘A’ weighted @ fs
103
= 48kHz
AVDD=DVDD=5V
THD (Note 1,2,3)
1KHz, 0dBFs
-90
-95
THD+N (Dynamic range, Note 2)
1kHz, -60dBFs
100
-106
DAC channel separation
<95
Analogue Output Levels
Output level
Load = 10k ohms,
1.1
0dBFS
Load = 10k ohms,
0.73
0dBFS,
(AVDD = 3.3V)
Gain mismatch
±1
channel-to-channel
Minimum resistance load
To midrail or a.c.
1
coupled
To midrail or a.c.
1
coupled
(AVDD = 3.3V)
Maximum capacitance load
5V or 3.3V
100
Output d.c. level
AVDD1-
AGND/2
Power On Reset (POR)
POR threshold
2.0
UNIT
dB
dB
dB
dB
Vrms
Vrms
%FSR
kOhms
kOhms
pF
V
V
Table 3 AC Electrical Characteristics
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, and where noted an A-weight 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. CAP decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
AI Rev 1.3 October 2001
6
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