SM5865CM

NIPPON PRECISION CIRCUITS—13

Theoretical Quantization Noise Reduction

The SM5865CM employs a 3rd-order 31-level quantized noise shaper to widely reduce quantization noise in

the audio band to the high frequency bandwidth. The theoretical quantization noise level at 16fs to 96fs opera-

tion is shown in figure 11.

Figure 11. Theoretical quantization noise level

0.5

1

1.5

2

2.5

3

3.5

4

180

170

160

150

140

130

120

110

100

90

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70

60

50

40

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10

0

0

Frequency (fs)

16fs

24fs

32fs

48fs

64fs

96fs

0 dB sine wave equivalent white noise level

16-bit, fs quantization noise level

20-bit, fs quantization noise level

24-bit, fs quantization noise level