JAJSSV2G March 2011 – January 2024 DAC3482
PRODUCTION DATA
The maximum output amplitude out of the complex signal multiplier (foe example, FMIX mode or CMIX mode with fs/8 mixer enabled) occurs if IIN(t) and QIN(t) are simultaneously full-scale amplitude and the sine and cosine arguments are equal to 2π x fMIXt + δ (2N-1) x π/4, where N = 1, 2, 3, ....
With mixer_gain = 1 and both IIN(t) and QIN(t) are simultaneously full-scale amplitude, the maximum output possible out of the complex signal multiplier is 0.707 + 0.707 = 1.414 (or 3dB). This configuration can cause clipping of the signal and should therefore be used with caution.
With mixer_gain = 0 in config2, the maximum output possible out of the complex signal multiplier is 0.5 x (0.707 + 0.707) = 0.707 (or -3dB). This loss in signal power is in most cases undesirable, and it is recommended that the gain function of the QMC block be used to increase the signal by 3dB to compensate.