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Configuration
3.2.4.2
3.2.4.3
3.2.4.4
3.2.4.5
Muting Polarity Select for Headphone Amplifier in U5 (JP7)
Jumper JP7 as indicated in the User ’s Guide for the amplifier installed in U5,
or:
To mute EVMs that are being used as headphone amplifiers in U5 when
the plug is removed from the headphone jack, jumper JP7 as follows:
If the EVM mutes on a low control signal, jumper JP7 to Hi
If the EVM mutes on a high control signal, jumper JP7 to Lo
Mute/Mode Select for Power Amplifiers in U3/U4 or U2 (JP6)
Jumper JP6 as indicated in the User ’s Guide for the power amplifiers installed
in U2 or in U3/U4, or:
To change the mode (from BTL to SE, for example) of the power amplifiers
installed in U3/U4 or U2 when a plug is inserted in the headphone jack,
jumper JP6 to Mode
To mute the power amplifiers installed in U3/U4 or U2 when a plug is
inserted in the headphone jack, jumper JP6 to Mute
Mute/Mode Polarity Select for Power Amplifiers in U3/U4 or U2 (JP8)
Jumper JP8 as indicated in the User ’s Guide for the power amplifiers installed
in U2 or in U3/U4, or:
To mute or change the mode of the power amplifiers installed in U3/U4 or
U2 when a plug is inserted in the headphone jack, jumper JP8 as follows:
If the power amplifiers mute or change to the desired mode on a low
control signal, jumper JP8 to Lo
If the power amplifiers mute or change to the desired mode on a high
control signal, jumper JP8 to Hi
Mute/Mode Jumper Select Table
Table 3–1 shows the relationship between the control line polarity select
jumpers (JP7 and JP8), the Mute/Mode select jumper (JP6), and the
headphone plug for amplifier EVMs with active-high control inputs.
Table 3–1. Mute/Mode/Polarity Jumper Select Table
POWER AMPLIFIERS
HEADPHONE
HEADPHONE AMPLIFIER
JP6
Mute
Mode
JP8
Lo
Hi
Lo
Hi
U2–U4
Active
Mute
Mute
Active
Mode A
Mode B
Mode B
Mode A
PLUG
Present
Not present
Present
Not present
Present
Not present
Present
Not present
U5
Active
Mute
Mute
Active
JP7
Lo
Hi
3-6
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