WM8351GEB/V Wolfson Microelectronics, WM8351GEB/V Datasheet - Page 321

• 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
29.4 DC-DC (STEP-UP) CONVERTER EXTERNAL COMPONENTS
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The DC-DC (Step-Up) Converter can operate as a Switch or as a Boost Converter. In Boost mode, it
operates in one of three different modes, set by the DC2_FBSRC register field. The following
subsections describe each of these modes in turn.
29.4.1
Constant voltage mode is selected by setting DC1_FBSRC[1:0] = 00, as described in Section 14.6.4.
The recommended connections to the DC-DC (Step-Up) Converter in this mode are illustrated in
Figure 89.
Figure 89 DC-DC (Step-Up) Converter External Components - Constant Voltage Mode
The DC-DC (Step-Up) Converter is capable of generating output voltages of up to 30V. The output
voltage is determined by the two external resistors R1 and R2, which form a resistive divider between
load connection and the voltage feedback pin FB2 or FB5. The output voltage is set as described in
the following equation:
Setting R2 to 47k Ω is recommended for most applications; R1 can be calculated using the following
equation, given the required output voltage:
When selecting suitable capacitors, is it imperative that the effective capacitance is within the
required limits at the applicable input/output voltage of the converter. Ceramic X7R or X5R types are
recommended.
The choice of output capacitor for DC-DC2 varies depending on the required output voltage. For a
20V output, 0.47μF is recommended. For a 5V output, 10μF is recommended.
DC-DC (STEP-UP) CONVERTER - CONSTANT VOLTAGE MODE
PD, March 2010, Rev 4.2
WM8351
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