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WM8781GEDS/V

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
WM8781 Production Data
w
PD, January 2012, Rev 4.5
16
DIGITAL FILTER CHARACTERISTICS
The WM8781 digital filter characteristics scale with sample rate.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ADC Sample Rate (Single Rate – 48Hz typically)
Passband
+/- 0.01dB 0 0.4535fs
-6dB 0.4892fs
Passband Ripple
+/- 0.01 dB
Stopband
0.5465fs
Stopband Attenuation
f > 0.5465fs -65 dB
Group Delay
22 fs
ADC Sample Rate (Dual Rate – 96kHz typically)
Passband
+/- 0.01dB 0 0.4535fs
-6dB 0.4892fs
Passband Ripple
+/- 0.01 dB
Stopband
0.5465fs
Stopband Attenuation
f > 0.5465fs -65 dB
Group Delay
22 fs
Table 8 Digital Filter Characteristics
ADC FILTER RESPONSES
-80
-60
-40
-20
0
0 0.5 1 1.5 2 2.5 3
Response (dB)
Frequency (Fs)
-0.02
-0.015
-0.01
-0.005
0
0.005
0.01
0.015
0.02
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Response (dB)
Frequency (Fs)
Figure 12 Digital Filter Frequency Response Figure 13 ADC Digital Filter Ripple
Production Data WM8781
w
PD, January 2012, Rev 4.5
17
ADC HIGH PASS FILTER
The WM8781 has a digital highpass filter to remove DC offsets. The filter response is characterised by the following
polynomial.
Figure 14 ADC Highpass Filter Response
1 - z
-1
1 - 0.9995z
-1
H(z) =
-15
-10
-5
0
0 0.0005 0.001 0.0015 0.002
Response (dB)
Frequency (Fs)
WM8781 Production Data
w
PD, January 2012, Rev 4.5
18
APPLICATIONS INFORMATION
RECOMMENDED EXTERNAL COMPONENTS
Figure 15 External Components Diagram
RECOMMENDED EXTERNAL COMPONENTS VALUES
COMPONENT
REFERENCE
SUGGESTED
VALUE
DESCRIPTION
C1 and C8 10F De-coupling for DVDD and AVDD
C2 and C7 0.1F De-coupling for DVDD and AVDD
C5 and C6 10F Analogue input AC coupling caps
R1 10k Current limiting resistors
R2 and R5 10k Internal op-amp input resistor
R3 and R6 5k Internal op-amp feedback resistor
R4 3.3k Common mode resistor
C4 0.1F Reference de-coupling capacitors for VMID pin
C3 10F
C9 0.1F Reference de-coupling capacitors for VREFP pin
C10 10F
Table 9 External Components Description
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

WM8781GEDS/V

Mfr. #:
Buy WM8781GEDS/V
Manufacturer:
Cirrus Logic
Description:
Audio A/D Converter ICs STEREO ADC W/384FS MASTER MODE
Lifecycle:
New from this manufacturer.
Delivery:
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