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| 型号： | EVAL-AD5380EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5380 |
| 产品培训模块： | DAC Architectures |
| 标准包装： | 1 |
| DAC 的数量： | 40 |
| 位数： | 14 |
| 采样率（每秒）： | 125k |
| 数据接口： | DSP，I²C，MICROWIRE?，并行，QSPI?，SPI? |
| 设置时间： | 8µs |
| DAC 型： | 电压 |
| 工作温度： | -40°C ~ 85°C |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | AD5380 |
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AD5380
Data Sheet
Rev. C | Page 22 of 40
ON-CHIP SPECIAL FUNCTION REGISTERS (SFR)
The AD5380 contains a number of special function registers
(SFRs), as outlined in Table 14. SFRs are addressed with REG1
= REG0 = 0 and are decoded using Address Bits A5 to A0.
Table 14. SFR Register Functions (REG1 = 0, REG0 = 0)
R/W
A5
A4
A3
A2
A1
A0
Function
X
0
NOP (No Operation)
0
1
Write CLR Code
0
1
0
Soft CLR
0
1
0
Soft Power-Down
0
1
0
1
Soft Power-Up
0
1
0
Control Register Write
1
0
1
0
Control Register Read
0
1
0
1
0
Channel Monitor
0
1
Soft Reset
SFR COMMANDS
NOP (No Operation)
REG1 = REG0 = 0, A5 to A0 = 000000
Performs no operation, but is useful in serial readback mode to
clock out data on DOUT for diagnostic purposes. BUSY pulses
low during a NOP operation.
Write CLR Code
REG1 = REG0 = 0, A5–A0 = 000001
DB13 to DB0 = Contain the CLR data
Bringing the CLR line low or exercising the soft clear function
will load the contents of the DAC registers with the data con-
tained in the user configurable CLR register, and will set
VOUT0 to VOUT39 accordingly. This can be very useful for
setting up a specific output voltage in a clear condition. It is also
beneficial for calibration purposes; the user can load full scale
or zero scale to the clear code register and then issue a hard-
ware or software clear to load this code to all DACs, removing
the need for individual writes to each DAC. Default on power-
up is all zeros.
Soft CLR
REG1 = REG0 = 0, A5 to A0 = 000010
DB13 to DB0 = Don’t Care
Executing this instruction performs the CLR, which is func-
tionally the same as that provided by the external CLR pin.
The DAC outputs are loaded with the data in the CLR code
register. It takes 35 s to fully execute the SOFT CLR, as
indicated by the BUSY low time.
Soft Power-Down
REG1 = REG0 = 0, A5 to A0 = 001000
DB13 to DB0 = Don’t Care
Executing this instruction performs a global power-down
feature that puts all channels into a low power mode that
reduces the analog supply current to 2 A max and the digital
current to 20 A max. In power-down mode, the output
amplifier can be configured as a high impedance output or can
provide a 100 k load to ground. The contents of all internal
registers are retained in power-down mode. No register can be
written to while in power-down.
Soft Power-Up
REG1 = REG0 = 0, A5 to A0 = 001001
DB13 to DB0 = Don’t Care
This instruction is used to power up the output amplifiers and
the internal reference. The time to exit power-down is 8 s. The
hardware power-down and software function are internally
combined in a digital OR function.
Soft RESET
REG1 = REG0 = 0, A5 to A0 = 001111
DB13 to DB0 = Don’t Care
This instruction is used to implement a software reset. All
internal registers are reset to their default values, which
correspond to m at full scale and c at zero scale. The contents of
the DAC registers are cleared, setting all analog outputs to 0 V.
The soft reset activation time is 135 s.
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