Digilent 410-233P-KIT - Manual (Page 2)

PmodBT2™ Reference Manual
Doc: 502-233 page 2 of 2
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converter module will normally have a voltage
range of 0-3.3V and should have a sample rate
of at least 16Khz. The low pass filter on the
input removes the high frequency artifacts
generated during the sampling process.
Additionally, the PmodAMP2 accepts inputs
from a variety of line level audio signals. A line
level input, like the output of a portable CD
player or MP3 player, will typically be a 1V
peak-to-peak analog voltage. The input band-
pass filter clarifies and amplifies the input
voltage from the signal source and then directs
the signal to the output jack to drive a speaker.
The connector J2 operates as the speaker
output. (See figure 1)
Functional Description
The gain on the PmodAMP2 may be selected
by tying the GAIN input to either logic ‘1’ or
logic ‘0’. (See table 1)
Table 1
GAIN Input Gain
1 6 decibels (dB)
0 12 decibels (dB)
The PmodAMP2 features a micropower
shutdown mode with a typical shutdown
current of 100 nA. Users can enable the
shutdown by applying a logic low to the
SHUTDOWN pin. A10K-ohm resistor pulls the
pin down to ground. To operate the AMP2
users must ensure the
SHUTDOWN pin is in
the highest position.
Customers will generally use the PmodAMP2
module with a Digilent programmable logic
system board or microcontroller board. These
boards produce either a pulse width modulated
digital signal or an analog signal via a digital to
analog converter. Most Digilent system boards
have
6-pin connectors that allow the
PmodAMP2 to plug directly into the system
board or to connect via a Digilent 6-pin cable.
Some older model Digilent boards may need
a Digilent Module Interface Board (MIB) and a
6-pin cable to connect to the PmodAMP2. The
MIB plugs into the system board and the cable
connects the PmodAMP2 to the MIB.
Note: For more information about the operation
and features of the Analog Devices SSM2377
Audio Amplifier integrated circuit please see
the datasheet available at
www.analog.com .