MAX9760EVSYS Maxim Integrated, MAX9760EVSYS Datasheet - Page 4

• Manufacturer Part Number: MAX9760EVSYS
• Description: Amplifier IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX9760, MAX9761, MAX9762, MAX9763r

The user interface (shown in Figure 2) is easy to operate;
use the mouse, or a combination of the Tab and Arrow
keys to manipulate the software. Each of the buttons
corresponds to bits in the command and configuration
bytes. By clicking on them, the correct SMBus write
operation is generated to update the internal registers of
the MAX9760. The Interface box indicates the current
Device Address, the Register Address, and the Data
Sent/Received for the last read/write operation. This
data is used to confirm proper device operation.
Note: Words in boldface are user-selectable features in
the software.
The MAX9760 EV kit can route one of two independent
stereo signals to the speakers or headphones. The
input signal is selected by choosing the desired option
in the Signal Input Selection box. Choosing Signal
Input #1, routes the signal from input jacks J1 and J2.
Choosing Signal Input #2, routes the signal from input
jacks J3 and J4.
The program continually polls the device for new status
data and monitors the alert conditions. To disable contin-
uous polling of data, uncheck the Automatic Read
checkbox. If an interrupt condition is generated by the
headphones being inserted, the message INTERRUPT
appears.
Selecting the desired option in the Speaker/Headphone
Control box allows the MAX9760 EV kit to operate in one
of three independent modes. The Automatic mode
(default) detects the insertion of the headphones in jack
J5. The speaker outputs are disabled if the headphones
are present, and enabled if the headphones are absent.
Selecting the Speaker Mode (BTL) provides drive to the
speakers and headphones (if both are present). Selecting
the Headphone Mode (Single-Ended) provides drive to
the headphones only.
Selecting the desired option in the Mute and Shutdown
Control box allows the MAX9760 EV kit to disable the left,
right, or both output channels. Checking the Mute Left
option mutes the left channel. Checking the Mute Right
option mutes the right channel. Checking the Mute
Left+Right option mutes both channels.
Checking the Shutdown all Audio Circuitry places the
MAX9760 into a low-power shutdown mode.
MAX9760/MAX9761 Evaluation
System/Evaluation Kit
4
_______________________________________________________________________________________
Software Mute and Shutdown Control
Detailed Description of
Speaker/Headphone Control
Signal Input Selection
User-Interface Panel
MAX9760 Status
Software
Selecting the desired option in the Output Gain
Selection box allows the MAX9760 EV kit to amplify the
chosen input signal using one of two different gains.
Selecting Gain A (with Bass-Boost) amplifies the input
signal using the feedback networks connected to the
GAINRA and GAINLA pins of the MAX9760. Selecting
Gain B (Flat) amplifies the input signal using the feed-
back networks connected to the GAINRB and GAINLB
pins. When the device is in Automatic mode, the output
gain is dependent on the insertion of the headphones.
Refer to the MAX9760–MAX9763 data sheet for more
details.
There are two methods for communicating with the
MAX9760: through the normal user-interface panel or
through the SMBus commands available by selecting
the 2-Wire Interface Diagnostic item from the Options
pulldown menu. A display pops up that allows the
SMBus protocols, such as Read Byte and Write Byte, to
be executed. To stop normal user-interface execution
so that it does not override the manually set values, turn
off the update timer by unchecking the Automatic
Read checkbox.
The SMBus dialog boxes accept numeric data in binary,
decimal, or hexadecimal. Hexadecimal numbers should
be prefixed by $ or 0x. Binary numbers must be exactly
eight digits. See Figure 3 for an example of this tool.
Note: In places where the slave address asks for an 8-bit
value, it must be the 7-bit slave address of the MAX9760
as determined by ADD with the last bit set to 1 for a read
operation or a zero for a write. Refer to the MAX9760
data sheet for a complete list of registers and functions.
The MAX9760 EV kit is a stereo, single-supply speak-
er/headphone amplifier. The EV kit is designed to be
driven by any stereo audio source.
The input impedance is 15kΩ. The EV kit is shipped
with components selected to produce a bass-boosted
frequency response (6dB, f
frequency response. The EV kit is powered with a 4.5V
to 5.5V supply. A highpass filter is implemented on the
MAX9760 EV kit. The lower 16Hz, -3dB corner frequen-
cy is dependent on components R1, R4, and C1, C4,
C9, and C10.
Multiple input and output jacks facilitate easy connec-
tions to the board. Connect the speakers to terminal
blocks TB1 and TB2. Connect the two stereo input
sources through jacks J1, J2 and J3, J4. Connect the
headphones through jack J5.
Detailed Description of
Simple SMBus Commands
Output Gain Selection
c
= 100Hz) and a 0dB flat-
Hardware