The relationship between value of Input Level Control register (Address 0) and gain value

Q What is the relationship between value of Input Level Control register (Address 0) and gain value? Why 1.8836 is corresponding to the gain of 11dB? A A gain of G=1.8836 corresponds to 5.5dB and in the AD1970, this value is multiplied by 2 to get a level of 11dB. Thus, a gain of 1.99 – the maximum allowed by the binary format here – would yield a gain of ~12dB (11.95dB).

Q What is the meaning of binary 2.20 format? A The binary 2.20 format refers to the fact that the total word is made up of 22 bits, with the ‘2.’ representing the first two bits, followed by 20 bits. The maximum gain of G=1.99 is represented by 0x1FFFFF [0111111111111111111111]. The value of unity gain G=1 is represented by 0x10000 [0100000000000000000000].

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AD1970 Obsolete
The AD1970 is an analog or digital in, analog out TV Stereo Digital Audio Processor with programmable MTS (BTSC) encoder which includes pilot-tone generation...
AD1970 on Analog.com

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