USER’S MANUAL
ISL282X7SOICEVAL2Z
Evaluation Board
AN1509
Rev 0.00
November 6, 2009
These resistors are 0 but can be changed by the user
to provide additional power supply filtering, or to reduce
the voltage rate-of-rise to less than ±1V/µs. Two
additional capacitors, C3 and C5 are connected close to
the part to filter out high frequency noise. Anti-reverse
diode D1 protects the circuit in the case of accidental
polarity reversal.
J6
V-
J8
J11
V+ J12
J13
VREF
J14
Introduction
The ISL282X7SOICEVAL2Z evaluation board is a
design platform containing all the circuitry needed to
characterize critical performance parameters of the
ISL282X7 operational amplifiers in SOIC-8 package,
using a variety of user defined test circuits.
The ISL282X7 operational amplifiers feature low bias
current, low noise, and low offset and temperature
drift.
R16
• ISL28207 Data Sheet,
FN6631
• ISL28217 Data Sheet,
FN6632
• ISL28227 Data Sheet,
FN6633
R31
Reference Documents
0
C2
1µF
D1
C3
0.01µF
C4
1µF
Evaluation Board Key Features
The ISL282X7SOICEVAL2Z 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 dual 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.
C5
0.01µF
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 supply negative
terminal. For split supplies, +V and -V terminals connect
to their respective power supply terminals. De-coupling
capacitors C2 and C4 connect to their respective
supplies through R16 and R31 zero-ohm resistors.
RF
100k
IN -
RIN-
IN-
IN-
-
V+
IN+
V-
+
VM
RREF+
VP
ISL282X7 (1/2)
10k
RIN+
IN +
0
0
VOUT
IN+
10k
100k
VCM
RL
DNP
VREF
VREF
GND
FIGURE 2. BASIC AMPLIFIER CONFIGURATION
AN1509 Rev 0.00
November 6, 2009
Page 1 of 5
ISL282X7SOICEVAL2Z
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 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.
R10
DNP
R6
DNP
R11
10k
R12
DNP
To Output
To IN-
To IN+
R17
DNP
R13
J1
R1
R3
DNP
J2
R2
DNP
DNP
R4
0
DNP
R5
100k
C1
OPEN
R14
From Output
C6
OPEN
R28
DNP
C8
OPEN
R26
0
10k
R15
DNP
R18
VREF
100k
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
D1
U1 (ISL28207FBZ)
U1 (ISL28217FBZ)
U1 (ISL28227FBZ)
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
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
User selectable resistors - not populated
R1-R3, R5-R8, R10, R12, RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER
R15, R17, R20,R22,
R28-R30, R32, R34-R36
R5, R18
R11, R14, R21, R24
R13, R18, R19, R23
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
AN1509 Rev 0.00
November 6, 2009
Page 2 of 5
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