WM8351GEB/V Wolfson Microelectronics, WM8351GEB/V Datasheet - Page 62

• Manufacturer Part Number: WM8351GEB/V
• Description: Audio CODECs Audio CODEC plus pwr management
• Manufacturer: Wolfson Microelectronics

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

WM8351
13.3 ENABLING THE AUDIO CODEC
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Before the audio CODEC can be used, it must be enabled by writing to the CODEC_ENA,
SYSCLK_ENA and BIAS_ENA register bits.
ADDRESS
R12 (0Ch)
Power
Mgmt 5
R11 (0Bh)
Power
Mgmt 4
R8 (08h)
Power
Mgmt 1
Table 19 Enabling the Audio CODEC
Each individual part of the audio CODEC (e.g. left/right ADC, left/right DAC, each analogue output
pin, mic bias etc.) also has its own enable bit, which must be set before that part of the CODEC can
be used. These enable bits are described in the sections that follow.
In order to minimize output pop and click noise, it is recommended that the WM8351 device is
powered up and down under control using the following sequences:
Power Up:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Ensure the CODEC power supplies are available before the CODEC is enabled
R12[CODEC_ENA]=1 . The order in which this is done should be DCVDD, DBVDD then
HPAVVD And/Or AVDD
Mute all outputs
Enable the anti-pop circuits by setting ANTI_POP. There are three Anti-pop setting options.
Recommended value is ANTI_POP = 01.
Ensure external capacitors are full discharged on all outputs that are used by delaying 250ms
Set the mixers and DAC volume to required settings
Enable VMID by setting VMID_ENA = 1. VMID should raise in a controlled fashion and charge
the output capacitors
Wait approx 500ms to allow VMID to charge.
Disable the anti-pop circuits by setting ANTI_POP = 00.
Un-mute all outputs
BIT
12
14
5
CODEC_EN
A
SYSCLK_ENA
BIAS_ENA
LABEL
DEFAULT
0
0
0
Master codec enable bit. Until this bit is set, all
codec registers are held in reset.
0 = All codec registers held in reset
1 = Codec registers operate normally.
CODEC SYSCLK enable
0 = disabled
1 = enabled
Enables bias to analogue audio CODEC
circuitry
0 = disabled
1 = enabled
DESCRIPTION
PD, March 2010, Rev 4.2
Production Data
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