wm9701acftv Wolfson Microelectronics plc, wm9701acftv Datasheet - Page 23

• Manufacturer Part Number: wm9701acftv
• Description: Power Ac97 Multimedia Audio Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
RECOMMENDED EXTERNAL COMPONENTS VALUES
Table 11 External Component Recommendations
RECOMMENDATIONS FOR 3.3V OPERATION
WOLFSON MICROELECTRONICS LTD.
C1 to C4
C5 to C17
C18
C19
C20
C21
C22
C23 to C25
C26 and C27
XT
COMPONENT
REFERENCE
10nF
470nF
1 F
0.1 F
10 F
0.1 F
10 F
10 F
22pF
24.576 MHz
SUGGESTED
VALUE
The device’s performance with AVDD = 3.3V is shown in Electrical Characteristics.
In 3.3V analogue operation, mid-rail reference scales to 1.5V. All ADC and DAC references are
3/5
660mVrms in 3.3V applications. If 1Vrms output is required, the mixer gain adjust PGAs need to be
increased by 3 times 1.5dB steps.
ths
of their nominal 5V value. Input and output signals that are 1Vrms in 5V applications, scale to
DESCRIPTION
De-coupling for DVDD and AVDD
AC coupling capacitors for setting DC level of analogue inputs.
Value chosen to give corner frequency below 20Hz for minimum 10K input impedance.
Reference de-coupling capacitors for ADC, DAC, Mixer and CAP2 references.
Ceramic type or similar.
Output AC coupling caps to remove VREF DC level from outputs.
Optional capacitors for better crystal frequency stability.
AC’97 master clock frequency. A bias resistor is not required, but if connected will not
affect operation if value is large (above 1M ).
PD Rev 3.2 January 2001
WM9701A
23