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AD9822 Datasheet(PDF) 11 Page - Analog Devices |
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AD9822 Datasheet(HTML) 11 Page - Analog Devices |
11 / 15 page REV. A AD9822 –11– PGA Gain Registers There are three PGA registers for individually programming the gain in the red, green, and blue channels. Bits D8, D7, and D6 in each register must be set low, and bits D5 through D0 control the gain range in 64 increments. See Figure 13 for a graph of the PGA Gain versus PGA register code. The coding for the PGA registers is straight binary, with an all “zeros” word corresponding to the minimum gain setting (1x) and an all “ones” word corresponding to the maximum gain setting (5.7x). Table IV. PGA Gain Register Settings D8 D7 D6 D5 D4 D3 D2 D1 D0 Gain (V/V) Gain (dB) Set to 0 Set to 0 Set to 0 MSB LSB 00 00 0 0 0 0 0 * 1.0 0.0 0 0 0 0 0 0 0 0 1 1.013 0.12 • • • • • • • • • 0 0 0 1 1 1 1 1 0 5.4 14.6 0 0 0 1 1 1 1 1 1 5.7 15.1 *Power-on default value. Offset Registers There are three PGA registers for individually programming the offset in the red, green, and blue channels. Bits D8 through D0 control the offset range from –350 mV to +350 mV in 512 increments. The coding for the offset registers is sign magnitude, with D8 as the sign bit. Table V shows the offset range as a function of the Bits D8 through D0. Table V. Offset Register Settings D8 D7 D6 D5 D4 D3 D2 D1 D0 Offset (mV) MSB LSB 000000000 * 0 000000001+1.2 • • • • • • 011111111 +350 1000000000 100000001 –1.2 • • • • • • 111111111 –350 *Power-on default value. |
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