WM8351GEB/V Wolfson Microelectronics, WM8351GEB/V Datasheet - Page 326
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WM8351GEB/V
Manufacturer Part Number
WM8351GEB/V
Description
Audio CODECs Audio CODEC plus pwr management
Manufacturer
Wolfson Microelectronics
Datasheet
1.WM8351GEBV.pdf
(328 pages)
Specifications of WM8351GEB/V
Number Of Adc Inputs
2
Number Of Dac Outputs
2
Conversion Rate
48 KSPS
Interface Type
Serial (2-Wire, 3-Wire, 4-Wire)
Resolution
12 bit
Operating Supply Voltage
3.7 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
BGA
Minimum Operating Temperature
- 25 C
Number Of Channels
2 ADC/2 DAC
Supply Current
260 uA
Thd Plus Noise
- 83 dB
Audio Codec Type
Stereo
No. Of Adcs
2
No. Of Dacs
2
No. Of Input Channels
8
No. Of Output Channels
6
Adc / Dac Resolution
24bit
Adcs / Dacs Signal To Noise Ratio
95dB
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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WM8351
29.6 PCB LAYOUT
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Poor PCB layout will degrade the performance and be a contributory factor in EMI, ground bounce
and resistive voltage losses. Poor regulation and instability can result.
Simple design rules can be implemented to negate these effects:
External input and output capacitors should be placed as close to the device as possible using short
wide traces between the external power components.
Route output voltage feedback on an inner plane away from inductor and LX nodes to minimise noise
and magnetic interference.
Use a local ground island for each individual converter connected at a single point onto a fully
flooded ground plane.
Current loop areas should be kept as small as possible with loop areas changing little during
alternating switching cycles.
Studying the layout below shows, for example, DCDC1 layout with external components C16, L3,
C17. The input capacitor, C16, is close into the IC and shares a small ground island with C17 the
output capacitor. The inductor, L3, is then situated in close proximity to C17 to keep loop area small
and current flowing in the same direction during alternating switching cycles. Note also the use of
short wide traces with all power tracking on a single (top) layer.
PD, March 2010, Rev 4.2
Production Data
326
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