2
AN1565.0
May 25, 2010
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 filtering and 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.
FIGURE 3. INPUT STAGE
FIGURE 4. OUTPUT STAGE
IN-
OUT
NODE
IN+
C3
R7
R5
J2
J1
R1
R6
R14
R2
R14
R3
R15
R10
R8
R11
R9
DNP
DNP
DN
P
DNP
DN
P
DNP
DN
P
OPEN
DNP
DN
P
10k
100k
100k
10k
0
VREF
To Output
To IN+
To IN-
R13
R12
R18
J12
C6
R17
DNP
0
OP
EN
TABLE 1. ISL281X7MSOPEVAL1Z COMPONENTS PARTS LIST
DEVICE #
DESCRIPTION
COMMENTS
C2, C4
CAP, SMD, 0805, 4.7µF, 50V, 10%, X7R, ROHS
Power Supply Decoupling
C1, C5
CAP, SMD, 0603, 0.01µF, 50V, 10%, X7R, ROHS
Power Supply Decoupling
C3, C6
CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS
User selectable capacitors - not populated
D1, D2
DIODE-RECTIFIER, 40V, 0.5A, ROHS
Reverse Power Protection
U1 (ISL28107FUZ)
OP AMP, MSOP, ROHS
U1 (ISL28117FUZ)
OP AMP, MSOP, ROHS
U1 (ISL28127FUZ)
OP AMP, MSOP, ROHS
R1-R4, R6-R8, R10, R13,
R14, R16, R17, R19, R20
RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER User selectable resistors - not populated
R5, R18
RES, SMD, 0603, 0
Ω
, 1/10W, TF, ROHS
Zero ohm user selectable resistors
R9, R12
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
Gain resistors
R11, R15
RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
Gain resistors
Application Note 1565
Application Note 1565
