Analog Devices SSM3582, Руководство пользователя

Страница: 4 / 13

UG-934 EVAL-SSM3582Z User Guide
Rev. B | Page 4 of 13
Jumper JP9 must be fitted to the GND position and the J17 and
J23 headers must be inserted.
EDGE MODE
To reduce the radiated emissions from the SSM3582 or the
SSM3582A amplifier, an edge rate control mode is available.
Register 0x05, Bit 3, controls the edge rate of the switching. This
low electromagnetic interference (EMI) mode is enabled by default.
To disable the low EMI mode, set Bit 3 of Register 0x05 to 0. To
return to the low EMI mode, set Bit 3 of Register 0x05 to 1.
MONO OPERATION
By default, the EVAL-SSM3582Z is configured for stereo
operation but can be changed to mono operation.
For mono operation, Resistor R27 through Resistor R30 must
be fitted with direct solder or 16 AWG wires to short the OUTL+
terminal to the OUTR+ pin and, similarly, to short the OUTL−
terminal to the OUTR− pin. Note that the device must be
configured to mono operation by setting the MONO bit (Bit 4,
Register 0x04) to 0 before turning on the power stage. Note that
the resistance of the short must be less than 10 mΩ. To set this
bit, write a 0xB1 hexadecimal value to Register 0x04 to ensure
the power stage turns on in mono operation.
Figure 3. Mono Mode Connection
COMPONENT SELECTION
Selecting the proper capacitors and ferrites for the EVAL-
SSM3582Z is key to achieving the performance required at
the cost budgeted.
Output Shunting Capacitors
Four output filter capacitors (C1, C2, C39, and C40) work with
the L2, L3, L6, and L7 ferrite beads. Use small size (0603 or
0402), multilayer, ceramic capacitors of dielectric type X7R or
COG (NPO) materials. The recommended value of the
capacitors is 220 pF.
Output Ferrites
If ferrite beads are preferred for EMI filtering at the output
nodes, Table 1 details the recommended components to avoid
excessive noise induced by the nonlinear behavior of ferrite
beads.
Table 1. Recommended Output Ferrite Beads
1
Part No. Manufacturer
Impedance (Z)
at 100 MHz Maximum
Current, I
MAX
(mA) DC Resistance, DCR (Ω) Size (mm)
NFZ2MSM101SN10 Murata Manufacturing Co. 100 Ω 4000 0.014 2.0 × 1.6 × 0.9
NFZ2MSM181SN10 Murata Manufacturing Co. 180 Ω 3400 0.020 2.0 × 1.6 × 0.9
NFZ2MSM301SN10 Murata Manufacturing Co. 300 Ω 3100 0.024 2.0 × 1.6 × 0.9
1 Contact Murata Manufacturing Co. for further options.
1426
2-
103