AIC1384 AIC [Analog Intergrations Corporation], AIC1384 Datasheet - Page 13

• Manufacturer Part Number: AIC1384
• Description: DDR Termination Regulator
• Manufacturer: AIC [Analog Intergrations Corporation]

VREF=0.9V
VREF=0.9V
SD
SD
R1
R2
R1
R2
10nF
10nF
DDRⅡ Application
Level Shifting Application
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AIC1384
AIC1384
AIC1384
AIC1384
GND
SD
VSENSE
VREF
GND
SD
VSENSE
VREF
GND
SD
VSENSE
VREF
GND
SD
VSENSE
VREF
VDDQ
VDDQ
VDDQ
VDDQ
AVIN
AVIN
PVIN
PVIN
AVIN
AVIN
PVIN
PVIN
VTT
VTT
VTT
VTT
VDDQ=1.8V
VDDQ=1.8V
VDDQ
8
7
6
5
8
7
6
5
8
7
6
5
8
7
6
5
VDDQ
Cin
0.1uF
2.2~5.5V
VIN
Cin
VIN=3.3V
Cout
Cout
VTT=0.9V
VTT=0.9V
Cin
VIN
Cout
Cout
VTT
VTT
Cin
1.8V
The circuit is recommended for DDR-II applications.
The output stage is connected to the 1.8V rail and
the AVIN pin can be connected to either a 3.3V or
5V rail.
Connect the power rail to 3.3V to provide a higher
continuous output current if 1.8V rail is not
available. Careful with the junction temperature
that may exceed the maximum due to the thermal
dissipation increases with lower V
voltages. In this configuration PVIN will be limited
to operation on the 3.3V rail.
The AIC1384 is available to scale the output to any
voltage required. One method is to level shift the
output above the internal reference voltage of
VDDQ/2 by using two resistors from the V
V
Another method is to level shift the output below
the internal reference voltage of VDDQ/2 by using
two resistors from the V
correct voltage at V
SENSE
V
. The correct voltage at VTT is
TT
V
TT
= VDDQ/2 (1 - R1/R2)
= VDDQ/2 (1 + R1/R2)
TT
is
SENSE
and VDDQ. The
AIC1384
TT
TT
output
to the
13