參數(shù)資料
型號： AD9148-EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 36/72頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD9148
設(shè)計資源： AD9148-EBZ Schematic
AD9148-EBZ BOM
AD9148-EBZ Gerber Files
標準包裝： 1
系列： TxDAC+®
DAC 的數(shù)量： 4
位數(shù)： 16
采樣率（每秒）： 1G
數(shù)據(jù)接口： 串行，SPI?
設(shè)置時間： 20ns
DAC 型： 電流
工作溫度： -40°C ~ 85°C
已供物品： 板
已用 IC / 零件： AD9148
Data Sheet
AD9148
Rev. B | Page 41 of 72
BYTE MODE
In byte mode, a FRAME signal must be provided along with the
DCI signal and the data. The most significant byte of the data
should correspond with DCI being high, and the least significant
byte of the data should correspond with DCI being low. The
FRAME signal indicates to which DAC the data is intended.
When FRAME is high, data on the top half of the port (A[15:8])
is sent to DAC 1 and data on the bottom half of the port (A[7:0]) is
sent to DAC 3. When the FRAME is low, data on the top half of
the port is sent to DAC 2 and data on the bottom half of the port
is sent to DAC 4. This pattern repeats continuously as shown in
FRAMEA
A[15:8]
DAC1H
DAC1L
DAC2H
DAC2L
DAC1H
DAC1L
DAC2H
DAC2L
A[7:0]
DAC3H
DAC3L
DAC4H
DAC4L
DAC3H
DAC3L
DAC4H
DAC4L
DCIA
08910-
048
Figure 48. Timing Diagram for Byte Mode
The AD9148 also includes a byte swap feature. By default, the
bytes should be formatted as an MSB sent to Bit 15 on Bus 1 and
Bit 7 on Bus 2. When byte swap is enabled (Register 0x03[2]), an
MSB should be sent to Bit 8 on Bus 1 and Bit 0 on Bus 2. This
is described in Table 14.
Table 14. Byte Swap Formatting
Byte Swap
Byte
A[15:8]
A[7:0]
0
MSB
Data Set 1[15:8]
Data Set 2[15:8]
0
LSB
Data Set 1[7:0]
Data Set 2[7:0]
1
MSB
Data Set 1[8:15]
Data Set 2[8:15]
1
LSB
Data Set 1[0:7]
Data Set 2[0:7]
DATA INTERFACE OPTIONS
To enable optimization of the data interface, some additional
options have been provided in the following registers:
Data format (Register 0x03)
Data receiver control (Register 0x14)
Data receiver status (Register 0x15)
Depending on the data rate and DCI vs. data skew, the internal
DCI can be inverted to meet the valid data timing window.
RECOMMENDED FRAME INPUT BIAS CIRCUITRY
Because the frame signal can be used as a reference clock in the
byte mode or as a trigger to reset the FIFO, it is recommended
that the frame input be tied to LVDS logic low when it is not
used (that is, when it is not driven by an ASIC or FPGA). The
external bias circuit shown in Figure 49 is recommended for
this purpose. This bias circuit applies to both FRAMEA and
FRAMEB ports.
08910-
145
100
150
51
AD9148
FRAMEP
FRAMEN
DVDD18
(1.8V)
Figure 49. External Bias Circuit
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