Part Number: DDC112 Hello guys, One of my customers is manufacturing some products which DDC112 is used for a photo diode (PD) current sensing. In the manufacturing, they found that some of DDC112 (about 2%) output data showed higher current than others (about 98%) when PD is covered completely from light . They thought the cause might be PD manufacture variation. So they removed PD. Then DDC112 IN1 was connected to only 22pF capacitor. The capacitor opposite terminal is connected to GND. But same DDC112 showed higher current than others too at the conndition. The followings are those DDC112 output. DDC112 which outputs higher data (categolized in 2%) output data standard deviation 1.81527pA 0.02865 1.81748pA 0.02850 1.81800pA 0.03045 DDC112 (others- categolized in 98%) output data standard deviation 1.81410pA 0.02239 1.81337pA 0.02197 1.81312pA 0.02363 The followings are the result when capacitor connected to IN1 and GND was exchenged to exclude capacitor cause. DDC112 which outputs higher data (categolized in 2%) output data standard deviation 1.82209pA 0.02661 1.82182pA 0.02650 1.82303pA 0.02982 DDC112 (others- categolized in 98%) output data standard deviation 1.81167pA 0.02182 1.81145pA 0.02315 1.81108pA 0.02344 The customer questions are the followings. Q1. Are those output data difference in normal range of DDC112 characteristics? Q2. If Q1 answer is yes, which datasheet parameter defines the deviation range? Q3. Is there any way to improve the deviation? Your reply would be much appreciated. Best regards, Kazuya Nakai.
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