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Application Note 1419
establish a ground referenced input for dual supply
operation, or can be externally set to any reference level for
single supply operation. VREF should not be left floating.
User-selectable Options
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
(see Figure 3) have additional resistor and capacitor, and
jumper placements for loading and/or measurement of
frequency sensitive parameters.
The outputs (see Figure 4) have a 10k Ω load resistor to
ground and 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
R1
R4
0
R11
10k
R13
100k
J2
DNP
R2
10k
C1
OPEN
R14
VREF
TO OUTPUT
TO IN-
TO IN+
FROM
OUTPUT
C6
OPEN
R26
DNP
R15
R18
0
DNP
FIGURE 3. INPUT STAGE
100k
FIGURE 4. OUTPUT STAGE
TABLE 1. ISL282X8EVAL1Z COMPONENTS PARTS LIST
DEVICE #
DESCRIPTION
COMMENTS
C2, C4
CAP-TANTALUM, SMD, D, 4.7μF, 50V, 10% LOW ESR, ROHS Power Supply Decoupling
C3, C5
C1, C6 to C10
D1
U1 (ISL28238FUZ)
U1 (ISL28238FBZ)
U1 (ISL28248FUZ)
U1 (ISL28248FBZ)
U1 (ISL28258FUZ)
U1 (ISL28258FBZ)
U1 (ISL28268FUZ)
U1 (ISL28268FBZ)
R30, R32, R34 to R36
R4, R16, R25 to R27, R31
CAP, SMD, 0603,1μF, 25V,10%, X7R, ROHS
CAP, SMD, 0603, DNP-Place Holder, ROHS
Diode-Schottky Barrier, SMD, SOT-23, 3P, 40V, ROHS
IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS
IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS
IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS
IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS
IC-39μA RRIO OP AMP, 8P, MSOP, ROHS
IC-39μA RRIO OP AMP, 8P, SOIC, ROHS
IC-39μA RRIO OP AMP, 8P, MSOP, ROHS
IC-39μA RRIO OP AMP, 8P, SOIC, ROHS
RES, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER
RES, SMD, 0603, 0 Ω , 1/10W, TF, ROHS
Power Supply Decoupling
User-Selectable Capacitors - Not Populated
Reverse Power Protection
User-Selectable Resistors - Not Populated
0 Ω User-Selectable Resistors
R11, R14, R21, R24, R28, R29 RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
Gain and Other User-Selectable Resistors
R13, R18, R19, R23
RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
2
Gain Resistors
AN1419.0
August 28, 2008
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