
75 of 162
October 20, 2006
IDT IDT88K8483
6. Connect the VSPI4A_VREF, VSPI4B_VREF and VSPI4M_VREF signals through filter to VDDL12 signals as described in Figure 43 IDT88K8483 .
7. Generate the VQDR_VREF/VG_VREF signals from the VDDH15 power supply using regulator or pot-divider like MAX1510 (VDDH15/2).
Figure 41 IDT88K8483 Power Supply Generation Example
Figure 42 IDT88K8483 VDDA25 Filter Circuit
Figure 43 IDT88K8483 SPI4x_VREF Filter Circuit
0.75REFOUT
MAX1510
REFIN
VDDH15/2
VDDT33
10K
VDDH15
10K
1nF
VCC
AGND
PGOOD
100K
VDDT33
10uF
IN
VDDT33
OUT
75V
OUTS
1nF
VDDT33
SHDN
PGND
10uF
VOUT
POWER CONVERTOR
GND
VDDC12
470uF
3.9K
VIN
12V
47uF
470uF
TRIM
RMT_ON_OFF
power_on signal from CPLD
VOUT
POWER CONVERTOR
GND
VDDH15
470uF
3.9K
VIN
12V
47uF
470uF
TRIM
RMT_ON_OFF
power_on signal from CPLD
VOUT
DC-DC CONVERTOR
GND
VDDT33
470uF
3.9K
VIN
12V
47uF
470uF
TRIM
RMT_ON_OFF
2.5VOUT
MIC37300-2.5
GND
VDDT33
470uF
VIN
47uF
TAB
VDDT33
SIL06C-33SADJ-V (ARTESYN)
SIL06C-15SADJ-V (ARTESYN)
SIL06C-12SADJ-V (ARTESYN)
VDDA25
1uF
4.7uF
VDDH25/VDDL25
Ferrite Bead
VDDL12
1uF
4.7uF
VSPI4A_VREF/VSPI4B_VRE/VSPI4C_VREF
Ferrite Bead