WM9713LGEFL/RV Wolfson Microelectronics, WM9713LGEFL/RV Datasheet - Page 125

• Manufacturer Part Number: WM9713LGEFL/RV
• Description: Audio CODECs Stereo AC'97 CODEC T/P Interface
• Manufacturer: Wolfson Microelectronics

Specifications of WM9713LGEFL/RV

• Number Of Adc Inputs: 1
• Number Of Dac Outputs: 1
• Conversion Rate: 8 KSPs
• Interface Type: AC97
• Resolution: 12 bit
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-48
• Minimum Operating Temperature: - 25 C
• Number Of Channels: 1 ADC, 1 DAC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pre-Production
DC COUPLED (CAPLESS) HEADPHONE OUTPUT
BTL LOUDSPEAKER OUTPUT
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In the interest of saving board space and cost, it may be desirable to eliminate the 220µF DC
blocking capacitors. This can be achieved by using OUT3 as a headphone pseudo-ground, as shown
below.
Figure 39 Capless Headphone Output Circuit Diagram
As the OUT3 pin produces a DC voltage of AVDD/2, there is no DC offset between HPL/HPR and
OUT3, and therefore no DC blocking capacitors are required. However, this configuration has some
drawbacks:
The power consumption of the WM9713L is increased, due to the additional power
If the DC coupled output is connected to the line-in of a grounded piece of equipment, then
OUT3 cannot be used for another purpose
SPKL and SPKR can differentially drive a mono 8Ω loudspeaker as shown below.
Figure 40 Speaker Output Connection (INV = 1)
To drive out differentially one of the speaker outputs must be inverted using INV1 or INV2.
consumed in the OUT3 output buffer.
OUT3 becomes short-circuited. Although the built-in short circuit protection will prevent
any damage to the WM9713L, the audio signal will not be transmitted properly.
PP Rev 3.2 September 2008
WM9713L
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