USER’S MANUAL
ISL281X7SOICEVAL1Z
Evaluation Board
AN1508
Rev 0.00
November 9, 2009
supply negative terminal. For split supplies, +V and -
V terminals connect to their respective power supply
terminals. De-coupling capacitors C2 and C4 connect
close to their respective supplies, while two
additional capacitors, C1 and C5, are connected
close to the part to filter out high frequency noise.
Anti-reverse diodes D1 and D2 protect the circuit in
the case of accidental polarity reversal.
J7
J8
Introduction
The ISL281X7SOICEVAL1Z evaluation board is a
design platform containing all the circuitry needed to
characterize critical performance parameters of the
ISL281X7 operational amplifiers in SOIC-8 package,
using a variety of user defined test circuits.
The ISL281X7 operational amplifiers feature low bias
current, low noise, and low offset and temperature
drift.
Reference Documents
• ISL28107 Data Sheet,
FN6631
• ISL28117 Data Sheet,
FN6632
DNP
R4
V-
V+
VREF
C2
4.7µF
D1
S1AB
J13
C4
J10
J11
J9
Evaluation Board Key Features
The ISL281X7SOICEVAL1Z is designed to enable the
IC to operate from a single supply, +4.5VDC to
+40VDC or from split supplies, ±2.25VDC to ±20V.
The board is configured for a single op amp
connected for differential input with a closed loop
gain of 10. A single external reference voltage
(VREF) pin and provisions for a user-selectable
voltage divider-filter are included.
S1AB
FIGURE 1. POWER SUPPLY CIRCUIT
Amplifier Configuration
(Figure 2)
The schematic of 1/2 of the op-amp with the
components supplied is shown in Figure 2. The
circuit implements a differential input amp with a
closed loop gain of 10. The circuit can operate from a
single supply or from dual supplies. The VREF pin
must be connected to ground to 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.
Power Supplies (Figure 1)
External power connections are made through the
+V, -V, VREF and Ground connections on the
evaluation board. For single supply operation, the -V
and Ground pins are tied together to the power
RF
100k
IN -
RIN-
IN-
IN-
-
V+
IN+
V-
+
VM
RREF+
VP
ISL281X7
10k
RIN+
IN +
0
DNP
VOUT
IN+
10k
100k
VCM
RL
DNP
VREF
VREF
GND
FIGURE 2. BASIC AMPLIFIER CONFIGURATION
AN1508 Rev 0.00
November 9, 2009
R16
• ISL28127 Data Sheet,
FN6633
4.7µF
D2
Page 1 of 5
ISL281X7SOICEVAL1Z
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.
IN-
IN+
NODE
OUT
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.
R8
DNP
R6
DNP
R9
10k
R10
DNP
R14
DNP
R11
J1
R1
DNP
R3
DNP
J2
R2
DNP
R5
0
DNP
R7
100k
C3
OPEN
R14
VREF
R15
100k
OPEN
R17
10k
R13
DNP
FIGURE 3. INPUT STAGE
FIGURE 4. OUTPUT STAGE
TABLE 1. ISL281X7SOICEVAL1Z COMPONENTS PARTS LIST
DEVICE #
C2, C4
C1, C5
C3, C6
D1, D2
U1 (ISL28107FBZ)
U1 (ISL28117FBZ)
U1 (ISL28127FBZ)
R1-R4, R6-R8, R10, R13,
R14, R16, R17, R19, R20
R5, R18
R9, R12
R11, R15
DESCRIPTION
CAP, SMD, 0805, 4.7µF, 50V, 10%, X7R, ROHS
CAP, SMD, 0603, 0.01µF, 50V, 10%, X7R, ROHS
CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS
DIODE-RECTIFIER, 40V, 0.5A, ROHS
OP AMP, SOIC, ROHS
OP AMP, SOIC, ROHS
OP AMP, SOIC, ROHS
RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER User selectable resistors - not populated
RES, SMD, 0603, 0, 1/10W, TF, ROHS
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
Zero ohm user selectable resistors
Gain resistors
Gain resistors
COMMENTS
Power Supply Decoupling
Power Supply Decoupling
User selectable capacitors - not populated
Reverse Power Protection
AN1508 Rev 0.00
November 9, 2009
DNP
C6
R12
To Output
To IN-
To IN+
R18
0
J12
Page 2 of 5
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