USER’S MANUAL
ISL281x8EVAL1Z
Evaluation Board
AN1350
Rev 0.00
Aug 14, 2007
and V- terminals connect to their respective power supply
terminals. De-coupling capacitors C
1
andC
2
connect to
ground through R
1
and R
21
0 resistors. Resistors R
20
and
R
24
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,
C
3
and C
4
are connected close to the part to filter out high
frequency noise. Anti-reverse diodes D
1
and D
2
protect the
circuit in the case of accidental polarity reversal.
J3
V-
J2
J1
R1
0
C1
+
D1 4.7µF
R24
0
C3
0.1µF
VM
VP
VOUT
RL
10k
V+
Introduction
The ISL281x8EVAL1Z evaluation board is a design platform
containing all the circuitry needed to characterize critical
performance parameters of the ISL281x8 operational
amplifiers, using a variety of user defined test circuits.
The ISL28138 and ISL28148 high-speed operational
amplifiers feature low power consumption, while the
ISL28158 and ISL28168 operational amplifiers feature
ultra-low power consumption. All op amps have rail-to-rail
output drive capability and are designed to operate with a
single lithium cell or two Ni_Cd batteries.
Reference Documents
R20
R21
C2
+
4.7µF D2 0
• ISL28138 Data Sheet, FN6336
• ISL28148 Data Sheet, FN6337
• ISL28158 Data Sheet, FN6377
• ISL28168 Data Sheet, FN6378
C4
0.1µF
Evaluation Board Key Features
The ISL281x8EVAL1Z is designed to enable the IC to
operate from a single supply, +2.4VDC to +5.5VDC or from
split supplies, ±1.2VDC to ±2.75V. The board is configured
for a single op amp connected for differential input with a
closed loop gain of 10. It also contains a single external
reference voltage (VREF) pin and provisions for a
user-selectable voltage divider (filter are included).
FIGURE 1. POWER SUPPLY CIRCUIT
Amplifier Configuration (
Figure
2)
The schematic 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 can be connected to ground to establish a ground
referenced input for split supply operation, or can be
externally set to any reference level for single supply
operation.
Power Supplies (
Figure 1
)
External power connections are made through the V+, V-
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+
RF
100k
RIN-
IN-
10k
IN+
IN+
VCM
VREF
0
RIN+
10k
RREF+
100k
IN+
IN-
0
ISL281x8
IN -
VP
0
-
V+
+
V-
VM
VREF
GND
10k
FIGURE 2.
BASIC AMPLIFIER CONFIGURATION
AN1350 Rev 0.00
Aug 14, 2007
Page 1 of 5
ISL281x8EVAL1Z
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 inputs,
the VREF input, outputs and the amplifier feedback loops.
A voltage divider and filter option (Figure 3) can be added to
establish a power supply-tracking common mode reference
at the VREF input. The inverting and non-inverting inputs
have additional resistor placements for adding input
attenuation, or to establish input DC offsets through the
VREF pin.
REF1
RINA-
R10
IN- J6
DNP
R2
R5
DNP
10k
RINA2-
R8
0
C6
R12
DNP
OPEN
RREFA-
R15
DNP
J4
The output (Figure 4) has a 10k load resistor to ground,
and has additional resistor and capacitor placements for
loading.
NOTE: Operational amplfiers are sensitive to output
capacitance and may oscilate. In the event of oscilation,
reduce output capacitance by using shorter cables, or add a
resistor in series with the output.
R17
R18
RREF
C5
+
4.7µF
R22
0
OPEN
R23
DNP
C8
R25
10k
R26
0
DNP
R27
10k
0
TO OUT
J5 OUT
IN1+ J7
C7
IN2+ J8
R3
RINA1+
R7
10k
R6
DNP
R9
RINA+
R11
0
RREFA+
R14
100k
C10
DNP
R13
OPEN
RGA+
TO IN-
TO IN+
OPEN
DNP
DNP
RINA2+
FIGURE 3. 1/2 INPUT STAGE
FIGURE 4. 1/2 OUTPUT STAGE
ISL281x8EVAL1Z Components Parts List
DEVICE NUMBER
C1, C2, C5
C3, C4
C6 to C10
D1, D2
U1 (ISL28138EVAL1Z)
U1 (ISL28148EVAL1Z)
U1 (ISL28158EVAL1Z)
U1 (ISL28168EVAL1Z)
DESCRIPTION
CAP-TANTALUM,S MD, D, 4.7µF, 50V, 10%, LOW ESR, ROHS
CAP, SMD, 0603, 0.1µF, 25V, 10%, X7R, ROHS
CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS
DIODE-RECTIFIER, SMD, SOD-123, 2P, 40V, 0.5A, ROHS
ISL28138FHZ-T7, IC-RAIL-TO-RAIL OP AMP, SOT-23, ROHS
ISL28148FHZ-T7, IC-RAIL-TO-RAIL OP AMP, SOT-23, ROHS
ISL28158FHZ-T7, IC-RAIL-TO-RAIL OP AMP, SOT-23, ROHS
ISL28168FHZ-T7, IC-RAIL-TO-RAIL OP AMP, SOT-23, ROHS
User-selectable resistors - not
populated
0 user selectable resistors
Gain and other user selectable
resistors
Gain resistors
COMMENTS
Power Supply Decoupling
Power Supply Decoupling
User-selectable capacitors - not
populated
Reverse Power Protection
R2, R3, R6, R8, R9, R12, R13, RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER
R15, R16, R23, R25, R27
R1, R10, R11, R17, R20, R21, RES, SMD, 0603, 0, 1/10W, TF, ROHS
R24, R26, R22
R4, R5, R7, R18
R14, R19
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
AN1350 Rev 0.00
Aug 14, 2007
OPEN
C9
Page 2 of 5
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