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AD28MSP02KN データシート(PDF) 9 Page - Analog Devices

部品番号 AD28MSP02KN
部品情報  Voiceband Signal Port
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD28MSP02KN データシート(HTML) 9 Page - Analog Devices

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AD28msp02
REV. 0
–9–
Serial Output Startup Time
The AD28msp02 begins transmitting data to the host processor
after it is taken out of powerdown. To take the AD28msp02 out
of powerdown, the host processor writes a control word to the
AD28msp02.
The start-up time (from the start of this control word write)
before the AD28msp02 begins transmitting data is shown in
Figure 11.
PC Board Layout Considerations
Separate analog and digital ground planes should be provided
for the AD28msp02 in order to ensure the characteristics of the
device’s ADC and DAC. The two ground planes should be con-
nected at a single point—this is often referred to as a “Star” or
“Mecca” grounding configuration. The point of connection may
be at the system power supply, at the PC board power connec-
tion, or at any other appropriate location. Because ground loops
increase susceptibility to EMF, multiple connections between
the analog and digital ground planes should be avoided.
The ground planes should be designed such that all noise-
sensitive areas are isolated from one another and critical signal
traces (such as digital clocks and analog signals) are as short as
possible.
Each +5 V digital supply pin, VDD, of the AD28msp02 (SOIC
Pins 20, 21) should be bypassed to ground with a 0.1
µF capaci-
tor. These capacitors should be low inductance, monolithic, ce-
ramic, and surface-mount. The capacitor leads and PC board
traces should be as short as possible to minimize inductive ef-
fects. In addition, a 10
µF capacitor should be connected be-
tween VDD and ground, near the PC board power connection.
MCLK Frequency
The sigma-delta converters and digital filters of the AD28msp02
are specifically designed to operate at a master clock (MCLK)
frequency of 13.0 MHz. MCLK must equal 13.0 MHz to guar-
antee the filter characteristics and sample rate of the ADC and
DAC. The AD28msp02 is not tested or characterized at any
other clock frequency.
A low cost crystal with a different frequency, for example
12.288 MHz, can be used for the master clock input; in this
case, however, the AD28msp02 is not guaranteed to meet the
specifications listed in this data sheet.
SDO
FIRST DATA WORD
TRANSMITTED
FROM AD28msp02
SCLK
DATA/
CNTRL
SDIFS
SDOFS
MSB
410 SCLK CYCLES
(2050 MCLK CYCLES)
SDI
MSB
POWERUP CONTROL WORD
WRITTEN TO AD28msp02
2nd MSB
2nd MSB
Figure 11. Serial Output Startup Time


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