MAX9750AEVKIT Maxim Integrated, MAX9750AEVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX9750AEVKIT
• Description: Amplifier IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX9750, MAX9751, MAX9755r

For the MAX9750A/B/C, jumpers JU2 and JU3 provide
an option to set the maximum gain of the speakers and
headphone amplifiers on the EV kit. See Table 2 for
shunt positions.
Jumper JU4 selects between the analog volume control
(VOL) for the MAX9750A/B/C or the right input channel for
the MAX9751/MAX9755. See Table 3 for shunt positions.
Jumper JU5 selects between the speaker mode and the
headphone mode for the MAX9750A/B/C, MAX9751,
and MAX9755 ICs. See Table 4 for shunt positions.
To evaluate the MAX9751, replace the MAX9750A with
the MAX9751. The MAX9751 features a 2:1 multiplexer,
allowing two sets of audio sources to be connected to
the inputs of the MAX9751. The first set of audio input
signals are connected to the IN_L and IN_R pads
Table 2. JU2 and JU3 Jumper Selection
Table 3. JU4 Jumper Selection
Table 5. JU2 Jumper Selection
SHUNT POSITION
JU3 (GAIN2)
1-2 (high)
1-2 (high)
2-3 (low)
2-3 (low)
SHUNT POSITION
SHUNT POSITION
1-2
2-3
Analog Volume Control (MAX9750A/B/C)
1-2
2-3
_______________________________________________________________________________________
JU2 (GAIN1)
Not allowed when
evaluating the
MAX9750A/B/C
Connected to the
thumb-wheel
potentiometer R2
1-2 (high)
1-2 (high)
Speaker/Headphone Mode (HPS)
2-3 (low)
2-3 (low)
MAX9750A/B/C,
Gain Selection (MAX9750A/B/C)
Pin 28 (VOL)
Evaluating the MAX9751
MAX9751 PIN 24 (GAIN)
Connected to GND
Connected to VDD
MAX9750A
See Evaluating the
MAX9751 or
Evaluating the
MAX9755 section
MAX9750A/B/C’s
analog volume
control is selected
10.5
13.5
12
9
FUNCTION
EV KIT
JU5 NOT INSTALLED (dB)
SPEAKER MODE GAIN,
MAX9750A Evaluation Kit
MAX9750B
19.5
16.5
15
18
(same as the MAX9750A), while the second set of
audio signals are connected to the PC_BEEP (left chan-
nel) and INRB (right channel) pads. To utilize the
PC_BEEP and INRB pads for the second set of audio
input signals, replace R1 with a 0Ω resistor and install
shunts on pins 1 and 2 of jumper JU4. The two sets of
audio sources are selectable by jumper JU3. The gain
for the speaker and headphone amplifiers is set by
jumper JU2. Refer to the MAX9751 IC data sheet for the
correct pinout and function.
The speaker and headphone outputs on the EV kit can
be selected by jumper JU5 and headphone jack J1.
See Table 4 in the Jumper Selection section.
When evaluating the MAX9751, jumper JU2 provides an
option to set the gain of the speakers and headphone
amplifiers of the EV kit. See Table 5 for shunt positions.
Table 4. JU5 Jumper Selection
(No headphone plugged into J1)
SPEAKER MODE GAIN,
(Headphone plugged into J1)
JU5 INSTALLED (dB)
SHUNT POSITION
10.5
MAX9750C
Installed
Installed
9
None
10.5
7.5
6
9
HEADPHONE MODE GAIN,
HEADPHONE MODE GAIN,
JU5 NOT INSTALLED (dB)
MAX9751 Gain Selection
JU5 INSTALLED (dB)
Forced headphone mode
Speaker mode
Headphone mode
MAX9750A/B/C
EV KIT FUNCTION
0
0
3
3
0
3
3