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TLV320ADC5120: under AVDD=IOVDD=1.8V the left and right channel THD+N have big difference

Anderson Cheng
Intellectual 1030 points
Part Number: TLV320ADC5120

Hi Experts,

When I test the TLV320ADC5120 EVM found the THD+N between Left and Right channel have big gap. I don't understand why and need your support to fix this issue.

test setup:

Power supply: AVDD=IOVDD=1.8V.

Input setup: Single end( 1N and 2N negative input pin connect to ground）, input 500mVrms 1Khz sinewave.

PPC3 setup: Single Ended, Line input, 10KΩ input impedance, Gain=odB, 32bit I2S-slave output.

AP input clock is I2S 256fs fs=48K. Test the THD+N in dB.

test result show as below:

THD+N
Left ch -88.3dB/Right ch -68.1dB (DRE ON, 2.5K, 0dB Gain,500mV input)
Left ch -87.8dB/Right ch -72.7dB (DRE ON, 10K, 0dB Gain,500mV input)
Left ch -87.6dB/Right ch -72.5dB (DRE OFF, 10K, 0dB Gain,500mV input)

2nd test is Without changing any setup except change the power supply to AVDD=IOVDD=3.3V. the Left and Right channel THD+N seems OK.

AVDD=IOVDD=3.3V
Left ch  -92.3dB/Right ch -91.2dB (DRE ON, 10K, 0dB Gain,500mV input)

Thanks.

Anderson