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AR0331 Datasheet(PDF) 19 Page - ON Semiconductor |
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AR0331 Datasheet(HTML) 19 Page - ON Semiconductor |
19 / 52 page AR0331 www.onsemi.com 19 Table 8. RECOMMENDED SENSOR GAIN coarse_gain(0x3060[5:4])/ coarse_gain_cb (0x3060[13:12]) fine_gain (0x3060[3:0])/ fine_gain_cb (0x3060[11:8]) ADC Gain 0 6 1.23 0 7 1.28 0 8 1.34 0 9 1.39 0 10 1.45 0 11 1.52 0 12 1.60 0 13 1.69 0 14 1.78 0 15 1.88 1 0 2.00 1 2 2.14 1 4 2.28 1 6 2.47 1 8 2.67 1 10 2.91 1 12 3.20 1 14 3.56 2 0 4 2 4 4.56 2 8 5.34 2 12 6.41 3 0 8 Each digital gain can be configured from a gain of 0 to 15.992. The digital gain supports 128 gain steps per 6dB of gain. The format of each digital gain register is “xxxx.yyyyyyy” where “xxxx” refers an integer gain of 1 to 15 and “yyyyyyy” is a fractional gain ranging from 0/128 to 127/128. The sensor includes a digital dithering feature to reduce quantization noise resulting from using digital gain. It can be disabled by setting R0x30BA[5] to 0. The default value is 1. PEDESTALS There are two types of constant offset pedestals that may be adjusted at the end of the datapath. The data pedestal is a constant offset that is added to pixel values at the end of the datapath. The default offset when ALTM is disabled is 168 and is a 12-bit offset. This offset matches the maximum range used by the corrections in the digital readout path. The purpose of the data pedestal is to convert negative values generated by the digital datapath into positive output data. It is recommended that the data pedestal be set to 16 when ALTM is enabled. The data pedestal value can be changed from its default value by adjusting register R0x301E. The ALTM pedestal (R0x2450) is also located at the end of the datapath. The ALTM pedestal default offset is 0. |
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Similar Description - AR0331_17 |
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