參數(shù)資料
型號： AD5762RCSUZ
廠商： Analog Devices Inc
文件頁數(shù)： 15/32頁
文件大?。?/td> 0K
描述： IC DAC DUAL 16BIT 1LSB 32-TQFP
產(chǎn)品培訓模塊： Data Converter Fundamentals
DAC Architectures
產(chǎn)品變化通告： AD5762R Metal Layer Edit Change 07/Sept/2009
標準包裝： 1
設置時間： 8µs
位數(shù)： 16
數(shù)據(jù)接口： 串行
轉換器數(shù)目： 2
電壓電源： 模擬和數(shù)字，雙 ±
功率耗散（最大）： 180mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-TQFP
供應商設備封裝： 32-TQFP（7x7）
包裝： 管件
輸出數(shù)目和類型： 2 電壓，雙極
采樣率（每秒）： 84.6k
產(chǎn)品目錄頁面： 784 (CN2011-ZH PDF)
AD5762R
Data Sheet
Rev. C | Page 22 of 32
68HC11*
MISO
SYNC
SDIN
SCLK
MOSI
SCK
PC7
PC6
LDAC
SDO
SYNC
SCLK
LDAC
SDO
SYNC
SCLK
LDAC
SDO
SDIN
*ADDITIONAL PINS OMITTED FOR CLARITY.
AD5762R*
07
24
8-
06
1
Figure 40. Daisy-Chaining the AD5762R
Daisy-Chain Operation
For systems that contain several devices, the SDO pin can be
used to daisy-chain several devices together. This daisy-chain
mode can be useful in system diagnostics and in reducing the
number of serial interface lines. The first falling edge of SYNC
starts the write cycle. The SCLK is continuously applied to the
input shift register when SYNC is low. If more than 24 clock
pulses are applied, the data ripples out of the shift register and
appears on the SDO line. This data is clocked out on the rising
edge of SCLK and is valid on the falling edge. By connecting the
SDO of the first device to the SDIN input of the next device in
the chain, a multidevice interface is constructed. Each device in
the system requires 24 clock pulses. Therefore, the total number
of clock cycles must equal 24n, where n is the total number of
AD5762R devices in the chain. When the serial transfer to all
devices is complete, SYNC is taken high. This latches the input
data in each device in the daisy chain and prevents any further
data from being clocked into the input shift register. The serial
clock can be a continuous or a gated clock.
A continuous SCLK source can be used only if SYNC is held low
for the correct number of clock cycles. In gated clock mode, a
burst clock containing the exact number of clock cycles must be
used, and SYNC must be taken high after the final clock to latch
the data.
Readback Operation
Before a readback operation is initiated, the SDO pin must be
enabled by writing to the function register and clearing the SDO
disable bit; this bit is cleared by default. Readback mode is
invoked by setting the R/W bit = 1 in the serial input register
write. With R/W = 1, Bit A2 to Bit A0, in association with Bit
REG2, Bit REG1, and Bit REG0, select the register to be read.
The remaining data bits in the write sequence are don’t care.
During the next SPI write, the data appearing on the SDO output
contains the data from the previously addressed register. For a
read of a single register, the NOP command can be used in clocking
out the data from the selected register on SDO. The readback
diagram in
shows the readback sequence. For example,
to read back the fine gain register of Channel A on the AD5762R,
implement the following sequence:
1.
Write 0xA0XXXX to the input register. This write configures
the AD5762R for read mode with the fine gain register of
Channel A selected. Note that all of the data bits, DB15 to
DB0, are don’t care.
2.
Follow with a second write: an NOP condition, 0x00XXXX.
During this write, the data from the fine gain register is
clocked out on the SDO line; that is, data clocked out contains
the data from the fine gain register in Bit DB5 to Bit DB0.
SIMULTANEOUS UPDATING VIA LDAC
Depending on the status of both SYNC and LDAC, and after
data has been transferred into the input register of the DACs,
there are two ways to update the DAC registers and DAC outputs.
Individual DAC Updating
In this mode, LDAC is held low while data is being clocked into
the input shift register. The addressed DAC output is updated
on the rising edge of SYNC.
Simultaneous Updating of All DACs
In this mode, LDAC is held high while data is being clocked
into the input shift register. All DAC outputs are updated by
taking LDAC low any time after SYNC has been taken high.
The update then occurs on the falling edge of LDAC.
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