参数资料
型号: EVAL-AD5420EBZ
厂商: Analog Devices Inc
文件页数: 10/32页
文件大小: 0K
描述: BOARD EVALUATION FOR AD5420
标准包装: 1
DAC 的数量: 1
位数: 16
数据接口: 串行
设置时间: 10µs
DAC 型: 电流
工作温度: -40°C ~ 85°C
已供物品:
已用 IC / 零件: AD5420
AD5410/AD5420
Data Sheet
Rev. F | Page 18 of 32
where N is the total number of AD5410/AD5420 devices in the
chain. When the serial transfer to all devices is complete,
LATCH is taken high. This latches the input data in each device
in the daisy chain. The serial clock can be a continuous or a
gated clock.
A continuous SCLK source can be used only if LATCH is taken
high after the correct number of clock cycles. In gated clock
mode, a burst clock containing the exact number of clock cycles
must be used, and LATCH must be taken high after the final
clock to latch the data. See Figure 4 for a timing diagram.
CONTROLLER
DATA IN
LATCH
SDIN
SCLK
DATA OUT
SERIAL CLOCK
CONTROL OUT
SDO
LATCH
SCLK
SDO
LATCH
SCLK
SDO
SDIN
*ADDITIONAL PINS OMITTED FOR CLARITY.
AD5410/
AD5420*
AD5410/
AD5420*
AD5410/
AD5420*
07027-
035
Figure 39. Daisy Chaining the AD5410/AD5420
Readback Operation
Readback mode is invoked by setting the address byte and read
address as shown in Table 9 and Table 8 when writing to the
input shift register. The next write to the AD5410/AD5420
should be a NOP command, which clocks out the data from the
previously addressed register, as shown in Figure 3. By default,
the SDO pin is disabled. After having addressed the AD5410/
AD5420 for a read operation, a rising edge on LATCH enables
the SDO pin in anticipation of data being clocked out. After the
data has been clocked out on SDO, a rising edge on LATCH
disables (tristate) the SDO pin once again. To read back the
data register, for example, the following sequence should be
implemented:
1. Write 0x020001 to the AD5410/AD5420 input shift
register. This configures the part for read mode with the
data register selected.
2. Follow this with a second write, a NOP condition, 0x000000.
During this write, the data from the data register is clocked
out on the SDO line.
Table 8. Read Address Decoding
Read Address
Function
00
Read status register
01
Read data register
10
Read control register
Table 9. Input Shift Register Contents for a Read Operation
MSB
LSB
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15 to DB2
DB1
DB0
0
1
0
Read address
1
X = don’t care.
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