at TA = 25°C, AVDD = 3.3 V,
IOVDD = 3.3 V, BSTVDD = 3.3 V, fIN = 1-kHz sinusoidal signal,
fS = 44.1 kHz, 32-bit audio data, BCLK = 256 × fS, TDM
slave mode, PLL on, channel gain = 0 dB, linear phase decimation filter, and MICBIAS
programmed voltage = 8 V (unless otherwise noted); all measurements are done on the
EVM by feeding the device analog input and PDM digital input signal using audio
precision, however, in the real system application, the device performance is
expected to be limited by single-bit PDM modulator digital microphone output
performance; all performance measurements are done with a 20-kHz, low-pass filter
and an A-weighted filter (unless otherwise noted)
DC-coupled differential microphone input with DC
common-mode 1NxP = ~6 V and INxM = ~2 V, high swing mode
enabled, measured using an external audio input
source
Figure 9-2 Analog Inputs FFT With a –60-dBr Input
4th-order PDM modulator with PDMCLKx = 2.8224
MHz
Figure 9-4 PDM
Inputs FFT With a –60-dBFS Input
DC-coupled differential microphone input with DC
common-mode 1NxP = ~6 V and INxM = ~2 V, high swing mode
enabled, measured using an external audio input
source