USER’S MANUAL
ISL28194EVAL1Z, ISL28195EVAL1Z
Evaluation Board
AN1352
Rev 1.00
May 26, 2010
power supply terminals. De-coupling capacitors C
1
and
C
2
connect to ground through R
1
and R
21
0Ω resistors.
Resistors R
20
and R
24
are 0Ω 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.
J
3
J
2
V-
J
1
R
1
0
D
1
C
1
+
4.7µF
R
24
0
C
3
0.1µF
VM
VP
VOUT
V+
Introduction
The ISL28194EVAL1Z, ISL28195EVAL1Z evaluation
board is a design platform containing all the circuitry
needed to characterize critical performance parameters
of the ISL28194 and ISL28195 operational amplifiers,
using a variety of user defined test circuits.
The ISL28194 and ISL28195 micro-power operational
amplifiers feature ultra-low power consumption,
rail-to-rail input and output drive capability, and are
designed to operate with two 1.5V Alkaline batteries.
Ordering Information
• ISL28194EVAL1Z
R
20
C
2
+
4.7µF
D
2
R
21
0
• ISL28195EVAL1Z
Reference Documents
• ISL28194, ISL28195 Data Sheet, FN6236
C
4
0.1µF
Evaluation Board Key Features
The ISL28194EVAL1Z, ISL28195EVAL1Z is designed to
enable the IC to operate from a single supply, +1.8VDC
to +5.5VDC or from split supplies, ±0.9VDC 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
0
(Figure 2)
The schematic of the op amp with the components
supplied is shown in Figure 2.
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+ and V- terminals connect to their respective
RF
10MΩ
RIN-
IN-
1MΩ
IN+
IN+
VCM
VREF
0Ω
RIN+
1MΩ
RREF+
10MΩ
IN+
+
VM
IN-
-
V+
V-
0Ω
ISL28194, ISL28195
VP
IN -
VREF
GND
10kΩ
FIGURE 2. BASIC AMPLIFIER CONFIGURATION
AN1352 Rev 1.00
May 26, 2010
Page 1 of 5
ISL28194EVAL1Z, ISL28195EVAL1Z
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
J
4
REF1
RINA-
R
10
IN- J
6
DNP
R
2
R
5
DNP
1M
RINA2-
R
8
0
C
6
DNP
R
12
OPEN
RREFA-
R
15
DNP
R
17
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.
The output (Figure 4) has additional resistor and
capacitor placements for loading.
RREF
+
4.7µF
R
22
0
OPEN
R
23
DNP
C
8
DNP
R
25
R
26
0
DNP
R
27
R
18
10k
C
5
0
TO OUT
J
5
OUT
IN1+ J
7
RINA1+
R
7
C
7
10M
6
RREFA+
R
14
RINA+
R
11
0
DNP
C
10
DNP
R
13
OPEN
RGA+
100M
TO IN-
TO IN+
IN2+ J
8
R
3
OPEN R
DNP
DNP
RINA2+
R
9
FIGURE 3. INPUT STAGE
FIGURE 4. OUTPUT STAGE
ISL28194EVAL1Z, ISL28195EVAL1Z Components Parts List
DEVICE NUMBER
C1, C2, C5
C3, C4
C6 to C10
D1, D2
U1 (ISL28194EVAL1Z)
U1 (ISL28195EVAL1Z)
DESCRIPTION
CAP-TANTALUM, SMD, 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
ISL28194FHZ-T7, IC-RAIL-TO-RAIL OP AMP, SOT-23, ROHS
ISL28195FHZ-T7, IC-RAIL-TO-RAIL OP AMP, SOT-23, ROHS
User-selectable resistors - not
populated
0Ω user-selectable resistors
Gain and other user-selectable
resistors
Gain 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, RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER
R13, R15, R23, R25, R27
R1, R5, R11, R17, R20,
R21, R22, R24, R26
R4, R18
R16
R7, R10
R14, R19
RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 1M, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 10M, 1/10W, 1%, TF, ROHS
AN1352 Rev 1.00
May 26, 2010
OPEN
C
9
Page 2 of 5
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