wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 31

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

Production Data
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SINGLE-ENDED INPUT
The Single-Ended PGA configuration is illustrated in Figure 21 for the Left channel. The available
gain in this mode is from -1.57dB to +28.5dB in non-linear steps. The PGA output is phase inverted
with respect to the selected input pin. Different input pins can be selected in the same mode by
altering the L_IP_SEL_N field.
The equivalent configuration is also available on the Right channel; this can be selected
independently of the Left channel mode.
Figure 21 Single Ended Mode
DIFFERENTIAL LINE INPUT
The Differential Line PGA configuration is illustrated in Figure 22 for the Left channel. The available
gain in this mode is from -1.57dB to +28.5dB in non-linear steps. The PGA output is in phase with
the input pin selected by L_IP_SEL_P. The PGA output is phase inverted with respect to the input
pin selected by L_IP_SEL_N.
As an option, common mode noise rejection can be provided in this PGA configuration, as illustrated
in Figure 22. This is enabled using the register bits defined in Table 5.
The equivalent configuration is also available on the Right channel; this can be selected
independently of the Left channel mode.
Figure 22 Differential Line Mode
IN1L/DMICDAT1
IN2L
M
M
U
X
U
X
L_IP_SEL_N
L_IP_SEL_P
Differential Line Mode (L_MODE = 01)
-1.57dB to +28.5dB,
non-linear steps
+
-
INL_ENA
LIN_MUTE
LIN_VOL
INL_CM_ENA
PD, Rev 4.0, September 2010
+
-
BYPASSL
WM8918
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