4.1.1. PrmAGCk (AGC K Constant)

Parameter Number: 0x401

Description: The PrmAGCk parameter is the target output level to the TDM bus divided by 32 (to limit K to the range 0 to -1). Note that K is the average level for the output.

PrmAGCk is defined as:

• K * 2²³

where K is defined as follows:

• (10^{(output level in dB)/20})/32

Note: Multiplying by 2²³ converts the value into a linear 24-bit value that accommodates the 24-bit DSPs used on the DM3 boards.

Therefore, K = 0.006529 corresponds to -13.6 dB average since

• 0.006529 = (10^(-13.6/20))/32

Note that -13.6 dB average would result in -6.6 dBm level of the analog output signal.

Here is a sample calculation to obtain a hexadecimal value of PrmAGCk for an output level of -19.6 dB:

• (10^(-19.6/20))/32 * 2²³ = 0x006b39

It is recommended that the value be set in the range of -30.0 dB to -13.6 dB. Higher values may result in strong peak to average compression if it is enabled or just severe clipping if peak to average compression is disabled.

Values: 0x2061 to 0xd5f1 (-30.0 dB to -13.6 dB output levels)

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