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MAX8821 Evaluation Kit
Audio Input Filter
The fully differential amplifier inputs can be biased at
voltages other than midsupply. The common-mode
feedback circuit adjusts for input bias, ensuring the out-
puts are still biased at midsupply. Input capacitors (C2,
C1 in Figure 5) are not required as long as the com-
mon-mode input voltage is within the specified range
listed in the Electrical Characteristics table found in the
MAX8821 IC data sheet. If the input capacitors are
used in conjunction with on-chip R INT , they form a high-
pass filter that removes the DC bias from an incoming
signal. The AC-coupling capacitor allows the amplifier
to bias the signal to an optimum DC level.
LDO1 and LDO2
The linear regulators are designed for low-dropout and
low quiescent current to maximize battery life. Both
LDOs are controlled through the I 2 C interface, minimiz-
ing the number of control lines to the MAX8821. I 2 C con-
trols the output voltages, and the enable/disable state for
both LDO1 and LDO2. At startup, the LDOs are off but
are preset to 1.2V for LDO1 and 1.5V for LDO2.
Thermal Shutdown
The MAX8821 includes a thermal-limit circuit that shuts
down the IC at a junction temperature of approximately
+160°C. The IC turns on after it cools by approximately
20°C.
Shutdown Mode
The MAX8821 can be put into two different shutdown
modes. The first shutdown mode is achieved by driving
V DD low. In this mode, the I 2 C interface becomes dis-
abled. The second shutdown is a lower power mode.
To enter the low-power mode, disable LED_, audio
amplifier, or LDOs through the MAX8821 EV kit soft-
ware. In low-power mode, the I 2 C interface is still
active.
I 2 C Address
The MAX8821 acts as a slave transmitter/receiver. The
slave address of the MAX8821 is preset to 1001110X,
where X is the R/W bit. The address 0x9C is designated
for write operations and 0x9D for read operations. The
I 2 C register is reset back to the default value when
either V IN drops below the UVLO threshold, or V DD is
driven low.
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