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Application Note 1509
User-selectable Options
(Figures 3 and 4)
Component pads are included to enable a variety of
user-selectable circuits to be added to the amplifier
VREF, inputs, outputs, and the amplifier feedback
loops. The Inputs (Figure 3) have additional resistor
and capacitor, and jumper placements for loading
and/or measurement of frequency sensitive
parameters.
The outputs (Figure 4) have additional resistor and
capacitor placements for loading.
NOTE: Operational amplifiers are sensitive to output
capacitance and may oscillate. In the event of
oscillation, reduce output capacitance by using shorter
cables, or add a resistor in series with the output.
IN-
IN+
NODE
OUT
R10
DNP
R12
DNP
J1
R4
R11
R13
J2
R1
DNP
R2
0
10k
10k
100k
C1
OPEN
R14
VREF
To Output
To IN-
To IN+
From Output
C6
OPEN
R26
DNP
R15
DNP
R18
100k
0
FIGURE 3. INPUT STAGE (1/2)
FIGURE 4. OUTPUT STAGE (1/2)
TABLE 1. ISL282X7SOICEVAL2Z COMPONENTS PARTS LIST
DEVICE #
C2, C4
C3, C5
C1, C6-C10
DESCRIPTION
CAP, SMD, 0805, 1μF, 50V, 10%, X7R, ROHS
CAP, SMD, 0603, 0.01μF, 50V, 10%, X7R, ROHS
CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS
COMMENTS
Power Supply Decoupling
Power Supply Decoupling
User selectable capacitors - not populated
D1
U1 (ISL28207FBZ)
U1 (ISL28217FBZ)
U1 (ISL28227FBZ)
DIODE-RECTIFIER, SMD, SOD-123, 2P, 40V, 0.5A, ROHS Reverse Power Protection
OP AMP, SOIC, ROHS
OP AMP, SOIC, ROHS
OP AMP, SOIC, ROHS
R1-R3, R5-R8, R10, R12, RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER
R15, R17, R20,R22,
R28-R30, R32, R34-R36
User selectable resistors - not populated
R5, R18
R11, R14, R21, R24
R13, R18, R19, R23
RES, SMD, 0603, 0 Ω , 1/10W,TF, ROHS
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
2
Zero ohm user selectable resistors
Gain resistors
Gain resistors
AN1509.0
November 6, 2009
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