WM8903LGEFK/RV Wolfson Microelectronics, WM8903LGEFK/RV Datasheet - Page 75

• Manufacturer Part Number: WM8903LGEFK/RV
• Description: Audio CODECs ULTRA LOW PWR HI FI CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8903LGEFK/RV

• Audio Codec Type: Stereo Codec
• No. Of Adcs: 2
• No. Of Dacs: 2
• No. Of Input Channels: 6
• No. Of Output Channels: 8
• Adc / Dac Resolution: 24bit
• Sampling Rate: 96kHz
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Adcs / Dacs Signal To Noise Ratio: 96dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
ANALOGUE OUTPUTS
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The WM8903 has eight analogue output pins:
The output signal paths and associated control registers are illustrated in Figure 33.
HEADPHONE OUTPUTS – HPOUTL AND HPOUTR
The headphone outputs are designed to drive 16Ω or 32Ω headphones. These outputs are ground-
referenced, i.e. no series capacitor is required between the pins and the headphone load. They are
powered by an on-chip charge pump (see “Charge Pump” section). Signal volume at the headphone
outputs is controlled as shown in Table 46.
The ground-referenced outputs incorporates a common mode, or ground loop, feedback path which
provides rejection of system-related ground noise. The return path for the HPOUTL and HPOUTR
outputs is via HPGND. This pin must be connected to ground for normal operation of the headphone
output. No register configuration is required.
LINE OUTPUTS – LINEOUTL AND LINEOUTR
The line outputs are identical to the headphone outputs in design. They are ground-referenced and
power by the on-chip charge pump. Signal volume at the headphone outputs is controlled as shown
in Table 47.
Note that these outputs are intended for driving line loads, as the charge pump powering both the
Headphone and Line outputs can only provide sufficient power to drive one set of headphones at any
given time.
The ground-referenced outputs incorporates a common mode, or ground loop, feedback path which
provides rejection of system-related ground noise. The return path for the LINEOUTL and
LINEOUTR outputs is via LINEGND. This pin must be connected to ground for normal operation of
the line output. No register configuration is required.
DIFFERENTIAL LINE OUTPUTS – LON/LOP AND RON/ROP
The differential line outputs are designed to differential line loads, including external loudspeaker
drivers. The WM9001 is an ideal component for driving loudspeakers from these outputs. These pins
are referenced to VMID (AVDD/2) and are powered directly from the AVDD supply.
Signal volume at the differential line outputs is controlled as shown in Table 48.
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Headphone outputs, HPOUTL and HPOUTR
Line outputs, LINEOUTL and LINEOUTR
Differential line outputs, LON/LOP and RON/ROP
PD, Rev 4.0, September 2010
WM8903
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