USER’S MANUAL
HIP2103_4DEMO2Z
Evaluation Boards
AN1575
Rev 0.00
October 1, 2010
Application Note 1575
Introduction
The ISL28433SOICEVAL1Z and ISL28433TSSOPEVAL1Z
Evaluation Board is designed to evaluate the performance
of the ISL28433 Chopper Stabilized op amp. The
evaluation board contains the circuitry needed to
evaluate the high performance of the ISL28433 amplifier.
The ISL28433 chopper stabilized rail-to-rail quad op amp
features a low 8µV maximum V
OS
over-temperature and
a 0.1Hz 1/f noise corner frequency enabling very high
gain single-stage DC amplifiers that can operate from
single cell batteries while consuming only 20µA of
current. The ISL28433SOICEVAL1Z and
ISL28433TSSOPEVAL1Z evaluation board can be
configured as a precision high-gain (G = 10,000V/V)
differential amplifier and demonstrates the level of
performance possible with this type of amplifier while
operating from battery voltages as low as 1.65V.
Power Supplies (Figure 1)
External power connections are made through the V+,
V-, VREF, and GND connections on the evaluation
board. The circuit can operate from a single supply or
from dual supplies. For single supply operation, the V-
and GND pins are tied together to the negative or
ground reference of the power supply. For split
supplies, V+ and V- terminals connect to their
respective supply terminals. De-coupling capacitors C1
and C2 provide low-frequency power-supply filtering,
while additional capacitors, C3 and C4, which are
connected close to the part, filter out high frequency
noise. Anti-reverse diodes D1 and D2 (optional)
protects the circuit in the momentary case of
accidentally reversing the power supplies to the
evaluation board. 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.
J3 V-
V+ J1
J4
VREF
Reference Documents
• ISL28233, ISL28433 Data Sheet;
FN7692
Evaluation Board Key Features
• Single Supply Operation: +1.65V to +5.5V
• Dual Supply Operation: ±0.825V to ±2.75V
R37
C2
R44
R1
0
C1
4.7µF
R48
D1
4.7µF 0
D2
0
V-
0.1µF
C4
V- AND V+
IC SUPPLY PINS
GND
J2
0
• Singled-Ended or Differential Input Operation with
High Gain (G= 10,000V/V)
• External VREF input
• Banana Jack Connectors for Power Supply and
VREF Inputs
• BNC Connectors for Op Amp Input and Output
Terminals
• Convenient PCB Pads for Op Amp Input/Output
Impedance Loading
V+
0.1µF
FIGURE 1. POWER SUPPLY CIRCUIT
R39, R47, R49, R50
IN-A
IN-B
IN-C
IN-D
2
6
9
13
1MΩ
-
ISL28433
+
11
V-
OUT_A
OUT_B
OUT_C
OUT_D
4
V+
0Ω
1 R51-R54
7
8
14
R67-R70
OPEN
R14, R16,
R18, R40
IN-
100Ω
R15, R17,
R19, R41
IN +
VCM
VREF
100Ω
IN+
IN+A 3
IN+B 5
IN+C 10
IN+D 12
C3
OUT
R24, R27, R29, R45
OPEN
VREF
GND
OPEN
FIGURE 2. BASIC DIFFERENTIAL AMPLIFIER CONFIGURATION
AN1575 Rev 0.00
October 1, 2010
Page 1 of 5
HIP2103_4DEMO2Z
Amplifier Configuration (Figure 3)
The schematic of the op amp input stage with the
components supplied is shown in Figure 3, with a closed
loop gain of 10,000V/V. The circuit implements a Hi-Z
differential input with unbalanced common mode
impedance. The differential amplifier gain is expressed in
Equation 1:
V
OUT
=
V
IN+
–
V
IN-
R
F
R
IN
+
V
REF
(EQ. 1)
additional resistor and capacitor placements for adding
input attenuation or feedback capacitors (Figure 3).
The output (Figure 4) also has 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.
C6
R6
DNP
R11
R2
0
OPEN
R14
DNP
DNP
R20
100
C23
OPEN
R39
1M
FROM OUT_A
For single-ended input with an inverting gain
G = -10,000V/V, the IN+ input is grounded and the
signal is supplied to the IN- input. VREF must be
connected to a reference voltage between the V+ and
V- supply rails. For non-inverting operation with
G = 10,001V/V, the IN- input is grounded and the
signal is supplied to the IN+ input. The non-inverting
gain is strongly dependent on any resistance from IN-
to GND. For good gain accuracy, a 0 resistor should
be installed on the empty R11 pad.
IN-A
TO IN-A
IN+A
R5
100
C7
OPEN
R15
DNP
R21
0
TO IN+A
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 can be added to establish a power
supply-tracking common mode reference using the VREF
input (see “ISL28433SOICEVAL1Z Schematic Diagram”
on page 4). The inverting and non-inverting inputs have
OUT_A
C14
FIGURE 3. INPUT STAGE
R51
OPEN
OPEN DNP
R59
DNP
R55
0
R63
DNP
R67
0
J13 OUT A
FIGURE 4. OUTPUT STAGE
TABLE 1. ISL28433TSSOPEVAL1Z and ISL28433MSOPEVAL1Z COMPONENTS PARTS LIST
DEVICE #
C1, C2
C3, C4
D1, D2
R32, R33
C5
R5, R7, R9, R14, R16,
R18, R35, R40
R39, R47, R49, R50
DESCRIPTION
CAP, SMD, 1210, 4.7µF, 50V, 10%, X7R, ROHS
CAP, SMD, 0805, 0.1µF, 50V, 10%, X7R, ROHS
40V SCHOTTKY BARRIER DIODE
RESISTOR, SMD, 0603, DNP, 1%, ROHS
CAP, SMD, 1210, 4.7µF, 50V, 10%, X7R, ROHS
RESISTOR, SMD, 0603, 100Ω, 1%, 1/16W, ROHS
RESISTOR, SMD, 0603, 10MΩ, 1%, 1/16W, ROHS
COMMENTS
Power Supply Decoupling
Power Supply Decoupling
Reverse Power Protection
VREF Resistor Divider
VREF Supply Decoupling
Gain Setting Resistor
Gain Setting Feedback Resistor
User selectable resistors - not populated
RESISTOR, SMD, 0603, DNP-PLACE HOLDER, ROHS
R2-R4, R11-R13,
R20-R23, R25,R26,R34,
R38, R42, R43, R55-R58,
R67-70, R24, R27-R31,
R33, R45, R46, R59-R62
U1 (ISL28433)
ISL28433FBZ (SOIC), ISL28433FVZ (TSSOP),
IC-RAIL-TO-RAIL OP AMP, ROHS
AN1575 Rev 0.00
October 1, 2010
C15
Page 2 of 5
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