Datasheet
SLAS412− DECEMBER 2003
www.ti.com
60
De-Emphasis Error at 48 ksps
0.3
0.25
0.2
0.15
0.1
0.05
0
−0.05
−0.1
0 0.5 1 1.5 2 2.5
Gain − dB
Frequency − Hz
De-Emphasis Error With Respect to Ideal Frequency Response For Fs = 48 kHz
x 10
4
PLL PROGRAMMING
The on-chip PLL in the ’AIC26 can be used to generate sampling clocks from a wide range of MCLK’s available in a system.
The PLL works by generating oversampled clocks with respect to Fsref (44.1 kHz or 48 kHz). Frequency division generates
all other internal clocks. The table below gives a sample programming for PLL registers for some standard MCLK’s when
PLL is required. Whenever the MCLK is of the form of N x 128 x Fsref (N=2,3…,17), PLL is not required.
Fsref = 44.1 kHz
MCLK (MHz) P J D ACHIEVED FSREF % ERROR
2.8224 1 32 0 44100.00 0.0000
5.6448 1 16 0 44100.00 0.0000
12 1 7 5264 44100.00 0.0000
13 1 6 9474 44099.71 0.0007
16 1 5 6448 44100.00 0.0000
19.2 1 4 7040 44100.00 0.0000
19.68 1 4 5893 44100.30 −0.0007
48 4 7 5264 44100.00 0.0000
Fsref = 48 kHz
MCLK (MHz) P J D ACHIEVED FSREF % ERROR
2.048 1 48 0 48000.00 0.0000
3.072 1 32 0 48000.00 0.0000
4.096 1 24 0 48000.00 0.0000
6.144 1 16 0 48000.00 0.0000
8.192 1 12 0 48000.00 0.0000
12 1 8 1920 48000.00 0.0000
13 1 7 5618 47999.71 0.0006
16 1 6 1440 48000.00 0.0000
19.2 1 5 1200 48000.00 0.0000
19.68 1 4 9951 47999.79 0.0004
48 4 8 1920 48000.00 0.0000