ZHCSGM5A August 2017 – November 2017 TLV320AIC3109-Q1
PRODUCTION DATA.
The output common-mode voltage and output range of the analog output are determined by an internal band-gap reference, in contrast to other codecs that can use a scaled version of the analog supply. This scheme is used to reduce noise coupling that can be on the supply (such as 217-Hz noise in a GSM cell phone) into the audio signal path.
However, because of the possible wide variation in analog supply range (2.7 V–3.6 V), an output common-mode voltage setting of 1.35 V, which is used for a 2.7-V supply case, is overly conservative if the supply is much larger (such as 3.3 V or 3.6 V). In order to optimize device operation, the TLV320AIC3109-Q1 includes a programmable output common-mode level that can be set by register programming to a level most appropriate to the actual supply range used by a particular customer. The output common-mode level can be varied among four different values, ranging from 1.35 V (most appropriate for low supply ranges, near 2.7 V) to 1.8 V (most appropriate for high supply ranges, near 3.6 V). As described in Table 5, the recommended DVDD voltage is dependent on the CM setting.
CM SETTING | RECOMMENDED AVDD, DRVDD | RECOMMENDED DVDD |
---|---|---|
1.35 V | 2.7 V–3.6 V | 1.525 V–1.95 V |
1.5 V | 3 V–3.6 V | 1.65 V–1.95 V |
1.65 V | 3.3 V–3.6 V | 1.8 V–1.95 V |
1.8 V | 3.6 V | 1.95 V |