I have a few questions regarding ADF7012:
-What is the processing delay of the Gaussian filter for GFSK?
-Is it possible to change GFSK BT value to less than 0.5?
-What methods can be used for variable-modulation-index (continous) transmission?
In my case I need to have modulation indecies which are not multiple of power-of-2 which means I need to change other parameters (such as divide factor, Fpfd) in order to keep baud rate constant while changing modulation index. I was thinking of updating N, R, and Mod registers at max speed before next bit goes through TxDATA, but then that would create a glitch on CP output, wouldn't?.
-Is there a way to load multiple registers at once such that glitch happens fast and not spread over writing of 3 registers?
-I was also thinking of tri-stating CP internally or externally (not sure which one gives better glitch performance) during register update. Is this a viable solution?
-Is there simlar devices which have mudulation idex multiplier (not power of 2)?
-What happens to TxCLK during register changes (N,R, Fpfd changes, but baud rate is the same)?
Updating 3 registers (88bits) at max speed: 4.5us. Bit duration on TxDATA: 1/9.6K=104us.
my specs are:
Fout: around 160 MHz (VCO divider of 4)
channel spacing: 50 KHz
Fout freq accuracy: 400 Hz
XTAL freq: 14,745,600 Hz (seems to be best for accuracy for various modulation indecies, and divisible by 9.6K)
baud rate: 9.6 Kbps
Modulation indecies: 0.5 and 3.65 (with 8% accuracy)
Modulation: binary GFSK