EB-2100 Datasheet, PDF (4/11 Pages) List of Unclassifed Manufacturers – DDX All-Digital, High Efficiency Evaluation Amplifier

_______________
__ EB-2100x
HEADERS / REGULATORS (FIG. 3D)
The EB-2100x features local power regulation to
facilitate operation from a unipolar +10 to +36
VDC supply. Alternatively, auxiliary power may
be applied at J8 (removing bead L7) separating
logic and output power supplies. Output from
the onboard +5V regulator is available on the J6
test header. Output from the onboard +3.3V
regulator is available on the J7 expansion
header. There is capability available to power
external circuits from either the +5V or the +3.3V
supplies or a combination not to exceed a total
current of 0.33A.
Expansion header J7 is provided to monitor or
apply input signals to the DDX-2000. Jumper
R42 may be removed to pass serial data
provided by an external processor. Test header
J6 is provided to monitor signals output from the
DDX-2000. Signals INLC, INLD, INRC, INRD
are driven low by the DDX-2000 and are used
for test purposes only. DIP switch SW1 is used
for control functions: POS1 reverses data
channels when open, normal when closed;
POS2 sets unity gain for test when closed,
normal when open; POS3 forces the DDX-2100
into low power mode when closed, normal when
open; POS4 disables the anticlipping function
when closed, normal when open.
Supervisor U8 is used for power-on-reset,
power-off sequencing, and as a convenient
means of commanded reset via pushbutton.
ADDITIONAL INFORMATION
Bill of Materials
A bill of materials for the evaluation board is
provided in Table 1 for reference. Note
equivalent components from alternate
manufacturers may be substituted. No warranty
of system performance is implied by Apogee
through use of the reference bill of materials.
Power Dissipation/Heat Sink Requirements
The DDX-2100 is a high efficiency dual channel
design intended for audio applications needs up
to 50 Watts RMS per channel. The power
dissipation of the device will depend primarily on
the supply voltage, load impedance, and output
modulation level. The thermal performance of
the evaluation board is consistent with a steady-
state duty rating of 50W RMS per channel with
both channels driven into 8Ω.
The DDX-2100 surface mount package includes
an exposed thermal pad on the top of the device
to provide a direct thermal path from the
integrated circuit to the heat sink. For continuous
duty rated applications, careful consideration
must be made to the overall thermal design.
Performance Measurements
Typical performance measurements for the
evaluation board are shown in Figs 4 through
11.
Class D amplifiers produce measurable
switching distortion outside the audio bandwidth.
Apogee's DDX amplifier uses a patented PWM
modulation scheme that significantly reduces the
size of these products compared to typical Class
D designs. However, in order to obtain accurate
performance measurements in the audio
bandwidth (i.e., 20Hz to 20kHz) additional
filtering is required.
The Typical Performance data in was taken
using a brick wall filter with a break frequency of
22kHz. This type of filter is often provided as
part of audio measurement systems.
OPERATING INSTRUCTIONS
Refer to Fig. 12 evaluation amplifier assembly
drawing. Attach a regulated power supply at J3
set between +10V and +36VDC. At +36V, the
power supply must be capable of delivering 4A
minimum for two channels. Attach a digital
audio input source at either the coaxial or optical
S/PDIF connectors. Select the digital input
source via J2. Connect 8 Ohm speakers to J4
(left speaker) and J5 (right speaker). Configure
SW1 as POS1 closed, POS2,3,4 open. Note,
the speaker outputs are bridged. Do not ground
any speaker connections, e.g. through an
oscilloscope. Apply power, digital source
material
and
enjoy!
4
Details are subject to change without notice.