参数资料
型号: AD9734-DPG2-EBZ
厂商: Analog Devices Inc
文件页数: 42/72页
文件大小: 0K
描述: BOARD EVAL FOR AD9734
标准包装: 1
DAC 的数量: 1
位数: 10
采样率(每秒): 1.2G
数据接口: 串行,SPI?
DAC 型: 电流
工作温度: -40°C ~ 85°C
已供物品: 板,软件
已用 IC / 零件: AD9734
AD9734/AD9735/AD9736
Rev. A | Page 47 of 72
CROSS CONTROLLER REGISTERS
The AD973x differential output stage is adjustable to equalize
the charge injection into the positive and negative outputs. This
adjustment impacts certain performance characteristics, such as
harmonic distortion or IMD. System performance can be en-
hanced by adjusting the cross controller.
If the system is calibrated after manufacture, adjust the cross
controller offsets to provide optimum performance. To start,
increment DNDEL<5:0> (Reg. 11, Bits 5:0) while observing
HD2 (second harmonic distortion) and/or IMD to find the
desired optimum. If DNDEL does not influence the perform-
ance, set it to 0 and increment UPDEL<5:0> (Reg. 10, Bits 5:0).
Based on system characterization, set one of these controls to
the maximum value to yield the best performance.
Figure 85 shows the effect of UPDEL and DNDEL.
04862-083
INCREMENT DNDEL TO MOVE
THE CROSSING TOWARD THE
IDEAL VALUE
IDEAL DIFFERENTIAL OUTPUT
CROSSING ALIGNMENT
INCREMENT UPDEL TO MOVE
THE CROSSING TOWARD THE
IDEAL VALUE
Figure 85. Effect of UPDEL and DNDEL
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