SLOSE75B February 2022 – March 2023 TAS2780
PRODUCTION DATA
The TAS2780 provides speaker voltage and current sense measurements for real time monitoring of loudspeaker behavior. The VSNS_P and VSNS_N pins should be connected after any ferrite bead filter or directly to the OUT_P and OUT_N connections if no EMI filter is used. The V-Sense connections eliminate voltage drop error due to packaging, PCB interconnect or ferrite bead filter resistance. The V-sense connections are also used for Post Filter Feed-Back (Section 8.4.5) to correct for any voltage drop induced gain error or non-linearity due to the ferrite bead. It should be noted that any interconnect resistance after the VSNS terminals will not be corrected for, so it is advised to connect the VSNS pins as close to the load as possible.
The voltage and current sense ADCs have a DC blocking filter. This filter cut-off frequency can be adjusted, or the filter can be bypassed using the HPF_FREQ_REC[2:0] register bits.
I-Sense and V-Sense blocks can be powered up by programming to low the ISNS_PD and VSNS_PD register bits. When powered down, the device will return null samples for the powered down block.