参数资料
| 型号： | AD5781BRUZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC DAC 18BIT SRL 20TSSOP |
| 产品变化通告： | AD57x1 Feature Change 27/Jul/2011 |
| 设计资源： | 18-Bit Accurate, low noise, precision bipolar DC voltage source (CN0177) |
| 标准包装： | 1,000 |
| 设置时间： | 1µs |
| 位数： | 18 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | * |
| 采样率（每秒）： | 1M |
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Data Sheet
AD5781
Rev. D | Page 21 of 28
Table 9. Hardware Control Pins Truth Table
LDAC
CLR
RESET
Function
0
The AD5781 is in reset mode. The device cannot be programmed.
The AD5781 is returned to its power-on state. All registers are set to their default values.
0
1
The DAC register is loaded with the clearcode register value, and the output is set accordingly.
0
1
The output is set according to the DAC register value.
1
0
1
The DAC register is loaded with the clearcode register value, and the output is set accordingly.
1
The output is set according to the DAC register value.
0
1
The output remains at the clear code value.
1
The output remains set according to the DAC register value.
0
1
The output remains at the clear code value.
1
The DAC register is loaded with the clearcode register value and the output is set accordingly.
0
1
The DAC register is loaded with the clearcode register value and the output is set accordingly.
1
The output remains at the clear code value.
0
1
The output is set according to the DAC register value.
1
X is don’t care.
ON-CHIP REGISTERS
DAC Register
Table 10 outlines how data is written to and read from the DAC register.
Table 10. DAC Register
MSB
LSB
DB23
DB22
DB21
DB20
DB19
DB2
DB1
DB0
R/W
Register address
DAC register data
R/W
0
1
18-bits of data
1
X is don’t care.
The following equation describes the ideal transfer function of the DAC:
(
)
REFN
REFP
OUT
V
D
V
+
×
=
1
218
where:
VREFN is the negative voltage applied at the VREFNS input pin.
VREFP is the positive voltage applied at the VREFPS input pin.
D is the 18-bit code programmed to the DAC.
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