User manual

Installation and Operation
© 2007 Microchip Technology Inc. DS51668A-page 9
2.3.1 Top Level Amplifier Circuit Diagrams
2.3.1.1 POWER SUPPLY BLOCK
The power supply is protected by a zener diode and bypassed by a capacitor.
Figure 2-3 shows the circuit diagram for the power supply. C
P1
= 1.0 µF.
FIGURE 2-3: Power Supply Block.
2.3.1.2 MID-SUPPLY REFERENCE BLOCK
The mid-supply reference consists of a voltage divider and a buffer amplifier. Figure 2-4
shows the circuit diagram for the mid-supply reference.
C
R1
= C
R2
= 0.1 µF, R
R1
= R
R2
= 20.0 kΩ.
FIGURE 2-4: Mid-supply Reference Block.
Power Supply
V
S
V
DD
C
P1
D
P1
Note: D
P1
is a zener diode with nominal voltage of 6.2V.
Mid-supply Reference
V
DD
V
R
C
R1
R
R1
U
R1
C
R2
R
R2