參數(shù)資料
型號: DAC3550A
廠商: MICRONAS SEMICONDUCTOR HOLDING AG
元件分類: DAC
英文描述: ECONOLINE: RSZ/P - 1kVDC
中文描述: 32-BIT DAC, PQFP44
封裝: METRIC, PLASTIC, QFP-44
文件頁數(shù): 27/35頁
文件大小: 626K
代理商: DAC3550A
DAC 3550A
Micronas
27
4.5. Power-up/down Sequence
In order to get a click-free power-up/down characteris-
tic, it is recommended to use the following sequences:
4.5.1. Power-up Sequence
1. Start VDD from 0 to +3.3 V and start AVDD0/1 from
0 to +3.3 V/+5 V. AVDD should not ramp up faster
than VDD.
2. Release PORQ from 0 to AVDD0/1.
3. Send I2C: volume, input select, speaker, ... optional.
4. Start I2S data.
The most important point is: PORQ has to ramp up
after AVDD0/1, simply by using a 10-k
pull-up resis-
tor to AVDD0/1 and a 2.2-nF capacitor to ground. No
further control on PORQ is needed.
Fig. 4
7:
Power-up sequence
4.5.2. Power-down Sequence
1. Stop I2S data.
2. Send I2C: LOW POWER.
3. Switch VDD, AVDD0/1 to 0.
VDD
AVDD
PORQ
90% VDD
90% AVDD
<0.2
×
VDD
<30 ms
0.7
×
AVDD
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