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Application Note 1368
Using the Board (Refer to Figure 2)
Lab Equipment
The equipment, external supplies and signal sources
needed to operate the board are listed below:
1. +2.7V to +3.6V DC Power Supply
2. Audio Signal Generator
3. Audio Signal Oscilloscope
4. Logic Control Generator and/or Pulse Generator
Initial Board Setup Procedure
1. Attach the evaluation board to the DC power supply at J1
(V+) and J2 (GND). Positive terminal at J1 and negative
terminal at J2. The supply should be capable of delivering
+2.7V to +3.6V and 100μ A of current. Set the supply
voltage to +3.3V.
2. Connect the Audio Source Signal to the LIN and RIN
BNC inputs (J11 and J13 respectively). The analog input
voltage range should not exceed ±1.5V PEAK .
Mute Mode
1. Drive SEL1 to Logic “0” (or float SEL1) and drive SEL2 to
Logic “1”.
2. The audio switch is now turned off. There is a 6 Ω
impedance to ground at the LOUT and ROUT outputs.
Shutdown Mode
1. Drive SEL1 to Logic “0” (or float SEL1) and drive SEL2 to
Logic “0” (or float SEL2).
2. The audio switch is now turned off. The LIN and RIN
terminals are now high impedance. The LOUT and ROUT
have an impedance of 220k Ω in parallel with the output
load impedance.
Test Points
The board has various test points for ease of connecting
probes to make measurements. The test points available are
described in Table 1.
TABLE 1. TEST POINT DESCRIPTIONS
3. Connect the Audio Signal Oscilloscope to the LOUT and
ROUT BNC outputs (J5 and J7 respectively).
4. Connect the Logic Control generator to the SEL1 and
SEL2 logic inputs.
Audio Mode
1. With the DC power supply turned on, drive SEL1 and
SEL2 to Logic “1” (> +1.4V).
2. Select the desired load on the board using jumpers JP1
and JP2 or through external loading.
3. The audio switches are turned on and the audio inputs at
LIN and RIN should be seen at the LOUT and ROUT.
DESIGNATOR
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
DESCRIPTION
V+ Test point
Ground Test Point
SEL2 Test Point
LOUT Test Point
ROUT Test Point
SEL1 Test Point
RIN Test Point
LIN Test Point
Click and Pop Mode
1. Drive SEL1 to Logic “1” and drive SEL2 to Logic “0” (or
float SEL2).
2. The audio switch is now turned off. There is a 40 Ω
impedance to ground at the LIN and RIN inputs. There is
a 6 Ω impedance to ground at the LOUT and ROUT
outputs.
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to
verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
4
AN1368.0
August 18, 2008
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