Edge Mode; Mono Operation; Component Selection - Analog Devices EVAL-SSM3582Z User Manual

UG-934

EDGE MODE

To reduce the radiated emissions from the
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

The board is configured for stereo operation by default, but can
be changed to mono operation.
For mono operation, the R27 through R30 resistors must be
fitted with 0 Ω or use 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.
Table 1. Recommended Output Ferrite Beads
Part No. Manufacturer
NFZ2MSM101SN10 Murata Manufacturing Co.
NFZ2MSM181SN10 Murata Manufacturing Co.
NFZ2MSM301SN10 Murata Manufacturing Co.
1 Contact Murata Manufacturing Co. for further options.
2
I C/STANDALONE
SELECT SWITCH
OPTICAL IN
OPTICAL/COAX
SELECTOR SWITCH
COAXIAL IN
SERIAL INPUT
SELECT
SPDIF/EXT
SSM3582 amplifier,
1
Z (Ω at 100 MHz)
100
180
300
2 2
I C CONNECTOR I C PULLUP
FOR USBi SELECTOR
RESET SPDIF RX
Set this bit by writing Register 0x04 with the hexadecimal value,
0xB1. This ensures the power stage turns on in mono operation.

COMPONENT SELECTION

Selecting the proper capacitors and ferrites for the evaluation
board is key to achieving the performance required at the cost
budgeted.
Output Shunting Capacitors
There are four output filter capacitors, C1, C2, C39, and C40, that
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 shows the recommended components to avoid
excessive noise induced by the nonlinear behavior of ferrite
beads.
I (mA)
MAX
4000
3400
3100
LEFT OUTPUT 5V LDO ENABLE
RIGHT OUTPUT 1.8V LDO
ENABLE/DISABLE
Figure 3. Board Settings
Rev. 0 | Page 4 of 13
EVAL-SSM3582Z User Guide
DC Resistance (DCR) (Ω)
0.014
0.020
0.024
PVDD IN
5V REG ENABLE/DISABLE
1.8V REGULATOR
INT/EXT SELECT
5V INT/EXT SELECT
3.3V REG
ENABLE/DISABLE
3.3V REGULATOR
INT/EXT SELECT
DEVICE ADDRESS
SETTING JUMPERS
Size (mm)
2.0 × 1.6 × 0.9
2.0 × 1.6 × 0.9
2.0 × 1.6 × 0.9