wm8961 Wolfson Microelectronics plc, wm8961 Datasheet - Page 75

• Manufacturer Part Number: wm8961
• Description: Ultra-low Power Stereo Codec With 1w Stereo Class D Speaker Drivers And Ground Referenced Headphone Drivers
• Manufacturer: Wolfson Microelectronics plc

w
WM8961
Table 55 ADC and DAC Recommended DACDIV and ADCDIV Configuration
SAMPLE
48
32
24
12
44.1
22.05
8
ADC /
RATE
(kHz)
DAC
RECOMMENDED
12.288
8.192
6.144
3.072
11.2896
5.6448
3.072
SYSCLK
(MHZ)
EXAMPLE SAMPLE RATE CONFIGURATIONS
Using the registers shown in Table 51, some example ADCDIV and DACDIV settings have been
calculated and detailed in Table 52 for various sample rates and SYSCLKs.
If only the DAC is being used (ADC not used) then the SYSCLK can be reduced to save power. This
is shown in Table 56.
Table 56 Recommended DACDIV Configuration for DAC Playback Only
DAC SAMPLE RATE (kHz)
100 => DAC clk = 12.288 MHz/4.0 = 3.072MHz (=64fs)
100 => DAC clk = 8.192 MHz/4.0 = 2.048MHz (=64fs)
010 => DAC clk = 6.144 MHz/2.0 = 3.072MHz (=128fs)
000 => DAC clk = 3.072 MHz/1.0 = 3.072MHz (=256fs)
100 => DAC clk = 11.2896MHz/4.0 = 2.8224MHz (=64fs)
010 => DAC clk = 5.6448 MHz/2.0 = 2.8224MHz (=128fs)
000 => DAC clk = 3.072 MHz/1.0 = 3.072MHz (=384fs)
48
32
24
12
44.1
22.05
8
DACDIV
RECOMMENDED SYSCLK
3.072
2.048
3.072
3.072
2.8224
2.8224
3.072
(MHZ)
000 => 256fs = 12.288 MHz/1.0 =12.288 MHz
000 => 256fs = 8.192 MHz/1.0 = 8.192 MHz
000 => 256fs = 6.144 MHz/ 1.0 = 6.144 MHz
000 => 256fs = 3.072 MHz/ 1.0 = 3.072 MHz
000 => 256fs = 11.2896MHz/1.0 =11.2896MHz
000 => 256fs = 5.6448 MHz/1.0 =5.6448 MHz
000 => 256fs = 3.072 MHz/ 1.0 = 3.072 MHz
000 => DAC clk = 3.072 MHz /1.0 = 3.072 MHz
(=64fs)
000 => DAC clk = 2.048 MHz/1.0 = 2.048 MHz
(=64fs)
000 => DAC clk = 3.072 MHz/1.0 = 3.072 MHz
(=128fs)
000 => DAC clk = 3.072 MHz/1.0 = 3.072 MHz
(=256fs)
000 => DAC clk = 2.8224 MHz/1.0 = 2.8224
MHz (=64fs)
000 => DAC clk = 2.8224 MHz/1.0 =
2.8224MHz (=128fs)
000 => DAC clk = 3.072 MHz/1.0 = 3.072MHz
(=384fs)
PP, August 2009, Rev 3.1
ADCDIV
DACDIV
Pre-Production
75