AD4851_REG_CHX_GAIN
#define AD4851_REG_CHX_GAIN_LSB(ch) AD4851_REG_CHX_GAIN(ch)
#define AD4851_REG_CHX_GAIN_MSB(ch) (AD4851_REG_CHX_GAIN(ch) + 0x01)
#define AD4851_REG_CHX_PHASE(ch) (AD4851_REG_CHX_GAIN(ch) + 0x02)