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WM8941 bảng dữ liệu(PDF) 22 Page - Wolfson Microelectronics plc

tên linh kiện WM8941
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WM8941
Pre Production
w
PP, Rev 3.3, December 2007
22
AUXILLIARY INPUT
An auxiliary input circuit (Figure 7) is provided which consists of an amplifier which can be configured
either as an inverting buffer for a single input signal or as a mixer/summer for multiple inputs with the
use of external resistors. The circuit is enabled by the register bit AUXEN.
Figure 7 Auxiliary Input Circuit
The AUXMODE register bit controls the auxiliary input mode of operation:
In buffer mode (AUXMODE=0) the switch labelled AUXSW in Figure 7 is open and the signal at the
AUX pin will be buffered and inverted through the aux circuit using only the internal components.
In mixer mode (AUXMODE=1) the on-chip input resistor is bypassed, this allows the user to sum in
multiple inputs with the use of external resistors. When used in this mode there will be gain
variations through this path from part to part due to the variation of the internal 20kΩ resistors
relative to the higher tolerance external resistors.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
6
AUXEN
0
Auxiliary input buffer enable
0 = OFF
1 = ON
R44
Input control
3
AUXMODE
0
0 = inverting buffer
1 = mixer (on-chip input resistor bypassed)
Table 5 Auxiliary Input Buffer Control



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