MAX9770EVKIT Maxim Integrated, MAX9770EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX9770EVKIT
• Description: Audio IC Development Tools Programmers, Development Systems
• Manufacturer: Maxim Integrated
• Series: MAX9770r

Specifications of MAX9770EVKIT

• Factory Pack Quantity: 1

The EV kit outputs (OUT+, OUT-) can be connected
directly to a speaker load without any filtering.
However, a filter can be added to ease evaluation by
recovering the audio signal. See Table 2 for the recom-
mended filtering component values for an 8Ω load and
30kHz cutoff frequency.
Jumpers JU1 and JU2 control the GAIN1 and GAIN2
pins of the MAX9770 IC. The MAX9770 can be config-
ured to automatically switch between two gain settings
depending on whether the EV kit is in speaker or head-
phone mode. By driving one or both gain inputs with
the HPS pin, the gain of the output changes when a
headphone is inserted/removed. See Table 3 for output
gain settings.
Table 3. JU1 and JU2 Jumpers Selection
Note: JU8 is closed.
SPEAKER MODE
GAIN (HPS = 0)
9 (default)
(dB)
6
3
6
9
6
0
3
6
_______________________________________________________________________________________
(HPS = 1) (dB)
HEADPHONE
MODE GAIN
-2 (default)
-2
1
4
1
1
1
4
7
Output Gain Selection
Jumper Selection
Open
Open
Pins 2 and 3
Pins 1 and 2
Open
Pins 1 and 2
Pins 1 and 2
Pins 2 and 3
Pins 2 and 3
JU1 SHUNT
POSITION
GAIN1 = HPS, connect pin
2 of JU1 to pin 1 of JU8
GAIN1 = HPS, connect pin
2 of JU1 to pin 1 of JU8
GAIN1 = low
GAIN1 = high
GIAN1 = HPS, connect pin
2 of JU1 to pin 1 of JU8
GAIN1 = high
GAIN1 = high
GAIN1 = low
GAIN1 = low
MAX9770 Evaluation Kit
GAIN1 PIN
Table 2. Recommended Filtering
Components for Outputs with 8Ω Load
COMPONENT
C16, C17
C18, C19
R2, R3
L1, L2
C21
Pins 2 and 3
Pins 1 and 2
Open
Open
Open
Pins 1 and 2
Pins 2 and 3
Pins 1 and 2
Pins 2 and 3
JU2 SHUNT
POSITION
RECOMMENDED VALUE
GAIN2 = low
GAIN2 = high
GAIN2 = HPS, connect pin
2 of JU2 to pin 1 of JU8
GAIN2 = HPS, connect pin
2 of JU2 to pin 1 of JU8
GAIN2 = HPS, connect pin
2 of JU2 to pin 1 of JU8
GAIN2 = high
GAIN2 = low
GAIN2 = high
GAIN2 = low
GAIN2 PIN
0.033µF
0.068µF
0.15µF
15µH
22Ω
3