EVAL-AD73311LEB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD73311LEB' PDF : 36 Pages View PDF
AD73311L
APPENDIX E
DAC Timing Control Example
SE
The AD73311’s DAC is loaded from the DAC register contents
just before the ADC register contents are loaded to the serial
SCLK
register (SDOFS going high). This default DAC load position
can be advanced in time to occur earlier with respect to the SDOFS
going high. Figure 39 shows an example of the ADC unload and
SDOFS
DAC load sequence. At time t1 the SDOFS is raised to indicate
that a new ADC word is ready. Following the SDOFS pulse,
16 bits of ADC data are clocked out on SDO in the subsequent
SDO
ADC
WORD
16 SCLK cycles finishing at time t2 where the DSP’s SPORT
SDIFS
will have received the 16-bit word. The DSP may process this
information and generate a DAC word to be sent to the AD73311.
Time t3 marks the beginning of the sequence of sending the
SDI
DAC word to the AD73311. This sequence ends at time t4
where the DAC register will be updated from the 16 bits in the
DAC
AD73311’s serial register. However, the DAC will not be updated
REGISTER
UPDATE
from the DAC register until time t5, which may not be acceptable in
certain applications. In order to reduce this delay and load the
DAC LOAD
FROM DAC
DAC at time t6, the DAC advance register can be programmed with
REGISTER
t1
t2
a suitable setting corresponding to the required time advance (refer
DAC
WORD
t3
t4
t5
t6
to Table VIII for details of DAC Timing Control settings).
Figure 39. DAC Timing Control
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
20-Lead Small Outline IC (R-20)
0.5118 (13.00)
0.4961 (12.60)
20
11
1
10
PIN 1
0.1043 (2.65)
0.0926 (2.35)
0.0291 (0.74) ؋ 45؇
0.0098 (0.25)
0.0118 (0.30)
0.0040 (0.10)
8؇
0.0500 0.0192 (0.49)
(1.27) 0.0138 (0.35)
BSC
SEATING
PLANE
0.0125 (0.32)
0.0091 (0.23)
0؇
0.0500 (1.27)
0.0157 (0.40)
20-Lead Shrink Small Outline IC (RS-20)
0.295 (7.50)
0.271 (6.90)
20-Lead Thin Shrink Small Outline IC (RU-20)
0.260 (6.60)
0.252 (6.40)
20
11
1
10
0.078 (1.98) PIN 1
0.068 (1.73)
0.07 (1.78)
0.066 (1.67)
0.008 (0.203)
0.002 (0.050)
0.0256
(0.65)
BSC
8؇
SEATING 0.009 (0.229) 0؇
PLANE 0.005 (0.127)
0.037 (0.94)
0.022 (0.559)
20
1
PIN 1
0.006 (0.15)
0.002 (0.05)
11
0.177 (4.50)
0.169 (4.30)
0.256 (6.50)
0.246 (6.25)
10
0.0433 (1.10)
MAX
SEATING
PLANE
0.0256 (0.65)
BSC
0.0118 (0.30)
0.0075 (0.19)
8؇
0.0079 (0.20) 0؇
0.0035 (0.090)
–36–
0.028 (0.70)
0.020 (0.50)
REV. A
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