at TA = 25°C, AVDD = 3.3 V, IOVDD = 3.3 V, fIN = 1-kHz sinusoidal signal, fS = 48 kHz, PDMCLKx = 64 × fS, 32-bit audio data, BCLK = 256 × fS, TDM slave mode, PLL on, and linear phase decimation filter (unless otherwise noted); all performance measurements are done with a 20-kHz, low-pass filter and an A-weighted filter (unless otherwise noted). All measurements are done by feeding the device PDM digital input signal using audio precision
Fifth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-5 THD+N vs Input AmplitudeFifth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-7 Frequency Response With a –20-dBr InputFourth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-9 THD+N vs Input AmplitudeFourth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-11 Frequency Response With a –20-dBr InputFourth order PDM modulator with PDMCLKx = 1.536 MHz |
Figure 5-13 THD+N vs Input AmplitudeFourth order PDM modulator with PDMCLKx = 1.536 MHz |
Figure 5-15 Frequency Response With a –20-dBr InputFifth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-6 THD+N vs Input Frequency With a –20-dBr InputFifth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-8 FFT With a –60-dBr InputFourth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-10 THD+N vs Input Frequency With a –20-dBr InputFourth order PDM modulator with PDMCLKx = 3.072 MHz |
Figure 5-12 FFT With a –60-dBr InputFourth order PDM modulator with PDMCLKx = 1.536 MHz |
Figure 5-14 THD+N vs Input Frequency With a –20-dBr InputFourth order PDM modulator with PDMCLKx = 1.536 MHz |
Figure 5-16 FFT With a –60-dBr Input