WM8351GEB/V Wolfson Microelectronics, WM8351GEB/V Datasheet - Page 87

• 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

Production Data
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Notes:
When DC blocking capacitors are used their capacitance and the load resistance together determine
the lower cut-off frequency, f
Smaller capacitance values will diminish the bass response. For a 16Ω load and a capacitance of
220μF, the following derivation of cut-off frequency applies:
f
In the DC coupled configuration, the headphone “ground” is connected to VMID. The OUT3 or OUT4
pins can be configured as DC output drivers by de-selecting all inputs to the OUT3 or OUT4 mixers.
The DC voltage on VMID in this configuration is equal to the DC offset on the OUT1L and OUT2L
pins therefore no DC blocking capacitors are required. This saves space and material cost in
portable applications.
It is recommended to only use the DC coupled configuration to drive headphones, and not to use this
configuration to drive the line input of another device.
1.
2.
3.
4.
c
= 1 / 2π R
The above figures illustrate the headphone connections to outputs OUT1L and OUT1R. The
equivalent configurations apply equally to OUT2L and OUT2R.
The DC-coupled configuration illustrated in Figure 47 shows OUT4 (muted) being used as the
Ground Return connection. The same capability may alternatively be provided using OUT3.
Twin headphone output (OUT1L, OUT1R, OUT2L and OUT2R) is possible, using a shared
Ground Return connection via any of OUT3, OUT4, HPCOM or AGND.
Capless operation is not possible when using the HPCOM feature.
L
C
1
= 1 / (2π x 16Ω x 220μF) = 45 Hz
c
. Increasing the capacitance lowers f
c
, improving the bass response.
PD, March 2010, Rev 4.2
WM8351
87