WM8903LGEFK/RV Wolfson Microelectronics, WM8903LGEFK/RV Datasheet - Page 102

• Manufacturer Part Number: WM8903LGEFK/RV
• Description: Audio CODECs ULTRA LOW PWR HI FI CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8903LGEFK/RV

• Audio Codec Type: Stereo Codec
• No. Of Adcs: 2
• No. Of Dacs: 2
• No. Of Input Channels: 6
• No. Of Output Channels: 8
• Adc / Dac Resolution: 24bit
• Sampling Rate: 96kHz
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Adcs / Dacs Signal To Noise Ratio: 96dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8903
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If low power consumption is required, then FLL settings must be chosen when N.K is an integer (ie.
FLL_K = 0). In this case, the fractional mode can be disabled by setting FLL_FRAC = 0.
For best FLL performance, a non-integer value of N.K is required. In this case, the fractional mode
must be enabled by setting FLL_FRAC = 1. The FLL settings must be adjusted, if necessary, to
produce a non-integer value of N.K.
The FLL output frequency is generated according to the following equation:
The FLL operating frequency, F
See Table 69 for the coding of the FLL_OUTDIV and FLL_FRATIO fields.
F
F
Note that the output frequencies that do not lie within the ranges quoted above cannot be guaranteed
across the full range of device operating temperatures.
In order to follow the above requirements for F
according to the desired output F
set so that F
Table 67 Selection of FLL_OUTDIV
The value of FLL_FRATIO should be selected as described in Table 68.
Table 68 Selection of FLL_FRATIO
In order to determine the remaining FLL parameters, the FLL operating frequency, F
calculated, as given by the following equation:
The value of FLL_N and FLL_K can then be determined as follows:
REF
VCO
2.8125 MHz - 3.125 MHz
5.625 MHz - 6.25 MHz
11.25 MHz - 12.5 MHz
22.5 MHz - 25 MHz
1MHz - 13.5MHz
256kHz - 1MHz
128kHz - 256kHz
64kHz - 128kHz
Less than 64kHz
REFERENCE FREQUENCY F
is the input frequency, as determined by FLL_CLK_REF_DIV.
must be in the range 90-100 MHz. Frequencies outside this range cannot be supported.
OUTPUT FREQUENCY F
F
F
F
N.K = F
OUT
VCO
VCO
VCO
= (F
= (F
= (F
is in the range 90-100MHz.
VCO
VCO
REF
OUT
/ (FLL_FRATIO x F
x N.K x FLL_FRATIO)
/ FLL_OUTDIV)
x FLL_OUTDIV)
VCO
OUT
OUT
REF
is set according to the following equation:
, as described in Table 67. The divider, FLL_OUTDIV, must be
REF
4h (divide by 32)
3h (divide by 16)
2h (divide by 8)
1h (divide by 4)
0h (divide by 1)
1h (divide by 2)
2h (divide by 4)
3h (divide by 8)
4h (divide by 16)
)
VCO
, the value of FLL_OUTDIV should be selected
FLL_OUTDIV
FLL_FRATIO
PD, Rev 4.0, September 2010
Production Data
VCO
, must be
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