Renesas ISL28433TSSOPEVAL1Z is an evaluation board designed to demonstrate the performance of the ISL28433 Chopper Stabilized op amp. It features a low 8µV maximum VOS 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 ISL28433TSSOPEVAL1Z can be configured as a precision high-gain (G = 10,000V/V) differential amplifier. External power connections are made through the V+, V-, VREF, and GND connections on the evaluation board.
Renesas ISL28433TSSOPEVAL1Z is an evaluation board designed to demonstrate the performance of the ISL28433 Chopper Stabilized op amp. It features a low 8µV maximum VOS 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 ISL28433TSSOPEVAL1Z can be configured as a precision high-gain (G = 10,000V/V) differential amplifier. External power connections are made through the V+, V-, VREF, and GND connections on the evaluation board.
USER’S MANUAL
AN1575
Rev 0.00
October 1, 2010
HIP2103_4DEMO2Z
Evaluation Boards
AN1575 Rev 0.00 Page 1 of 5
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 VOS 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.
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
• 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
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.
R37
D1
D2
R48
C2 C1
J1
J2
J4
J3
0
0
4.7µF 4.7µF
VREF
V+
V-
C4
0.1µF
C3
0.1µF
FIGURE 1. POWER SUPPLY CIRCUIT
GND
V- V+
R44
0
R1
0
V- AND V+
IC SUPPLY PINS
VREF
IN +
GND
1MΩ
OPEN
OUT
ISL28433
V-
0Ω
VCM
IN-
IN+
VREF
V+
100Ω
100Ω
-
+
OPEN OPEN
R39, R47, R49, R50
R14, R16,
R24, R27, R29, R45
R51-R54
R67-R70
IN-A
IN-B 6
2
4
11
FIGURE 2. BASIC DIFFERENTIAL AMPLIFIER CONFIGURATION
OUT_A 1
OUT_B 7
OUT_C 8
OUT_D 14
IN-C
IN-D 13
9
IN+A
IN+B 5
3
IN+C
IN+D 12
10
R15, R17,
R19, R41
R18, R40
AN1575 Rev 0.00 Page 2 of 5
October 1, 2010
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:
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.
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
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.
VOUT VIN+
VIN-RF
RIN–VREF
+= (EQ. 1)
R11
R6
R2
R5
R39R14
100
DNP
DNP
0
100
1M
OPEN
TO IN-A
TO IN+A
FROM OUT_A
FIGURE 3. INPUT STAGE
OPEN
C6
R20
DNP
C23
OPEN
C7
R15
0
DNP
R21
IN+A
IN-A
OUT A
R51 J13
C15
R59
DNP
OPEN
0
FIGURE 4. OUTPUT STAGE
C14
OPEN
R55
DNP
R63
0
R67
DNP
OUT_A
TABLE 1. ISL28433TSSOPEVAL1Z and ISL28433MSOPEVAL1Z COMPONENTS PARTS LIST
DEVICE # DESCRIPTION COMMENTS
C1, C2 CAP, SMD, 1210, 4.7µF, 50V, 10%, X7R, ROHS Power Supply Decoupling
C3, C4 CAP, SMD, 0805, 0.1µF, 50V, 10%, X7R, ROHS Power Supply Decoupling
D1, D2 40V SCHOTTKY BARRIER DIODE Reverse Power Protection
R32, R33 RESISTOR, SMD, 0603, DNP, 1%, ROHS VREF Resistor Divider
C5 CAP, SMD, 1210, 4.7µF, 50V, 10%, X7R, ROHS VREF Supply Decoupling
R5, R7, R9, R14, R16,
R18, R35, R40
RESISTOR, SMD, 0603, 100Ω, 1%, 1/16W, ROHS Gain Setting Resistor
R39, R47, R49, R50 RESISTOR, SMD, 0603, 10MΩ, 1%, 1/16W, ROHS Gain Setting Feedback Resistor
R2-R4, R11-R13,
R20-R23, R25,R26,R34,
R38, R42, R43, R55-R58,
R67-70, R24, R27-R31,
R33, R45, R46, R59-R62
RESISTOR, SMD, 0603, DNP-PLACE HOLDER, ROHS User selectable resistors - not populated
U1 (ISL28433) ISL28433FBZ (SOIC), ISL28433FVZ (TSSOP),
IC-RAIL-TO-RAIL OP AMP, ROHS
AN1575 Rev 0.00 Page 3 of 5
October 1, 2010
HIP2103_4DEMO2Z
ISL28433SOICEVAL1Z Top View
AN1575 Rev 0.00 Page 4 of 5
October 1, 2010
HIP2103_4DEMO2Z
ISL28433SOICEVAL1Z Schematic Diagram
IN+A
RINA1+
IN+D
RINA1+
IN-A
IN+B
IN-B
OUT
OUT
OUT
IN+C
IN-C IN-D
OUT
J6
5
R16
DNP
OPEN
100k
C8
DNP
DNP
R3
DNP
IN+B
IN-B 6
0.1µF 0.1µF
4.7µF 4.7µF
0
OPEN
OPEN
100k
100k
100k
100k
DNP
DNP
100k
100k
OPEN
V-
OPEN
100k
100k
IN-B
DNP
0
0
0
OPEN
OPEN
DNP
10k
IN-C
IN-A
100k
DNP
100k
100k
0
DNP
0
100k
10k
0
DNP
OPEN
OPEN DNP
10k
0
DNP
OPEN
DNP
00
OPEN
10k
0
DNP
0
DNP
DNP
DNP
100k
0
DNP
OPEN
OPEN
100k
DNP
IN+C
DNP
DNP
100k
DNP
OPEN
0
OPEN
IN+A
V+
IN+C
V-
OUTD
IN+B
100k
0
10k
OPEN
IN+D
OPEN
V+
OPEN
100k
OPEN
4.7µF
SOIC14
OUTA
IN+A
OPEN
100k
IN-D
IN-D
OUTB
R37 J3
1
R44
J2
1
R1
R48 J1
1
1
2
3
4
C7
1
R21
R15
R24
J5 1
2
3
4
5
R2
R6 12
R14
R28
R33 R32 J4
1
C17 1
2
C16
12
R52
R56
R60
R64
R68
J14
1
2
3
4
5
R47
R30
R22
R27
12
R12
R8
R17
J7 1
2
3
4
5
R7
C9
12
J8 1
2
3
4
5
R23
R18
R31
R25
R29
C10
12
R13
R10
R19
R4
J9 1
2
3
4
5
R9
C11
12
J10 1
2
3
4
5
R26
J15
1
2
3
4
5
R69
R65
R61
R57C19 1
2
R53
C18
12
R49
J16
1
2
3
4
5
R70
R66
R62
C21 12
R54
C20
12
R50
J13
1
2
3
4
5
R67
R63
R59
C15 12
R51
C14
12
R39
R40
R46
R42
C12
12
R41
R38
R36
R34
R35
C13
12
J11 1
2
3
4
5
1
2
3
4
5
D2
21D1
21
C23
12
C22
12
C24
12
C25
12
U1
1
10
11
12
13
14
2
3
5
7
C1C2
C5
C3
C4
DNP
9IN-C
OUTC
4
IN-A
R20
R11
R45
IN+D
R43
DNP
R58
DNP
J12
2
100k
R5
DNP
R55
DNP
C6
8
9
10
11
12
14
4
5
6
7
PACK.
GENERIC
3
2
1
13
V+
REF1 V-
8
0
0
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Renesas ISL28433TSSOPEVAL1Z is an evaluation board designed to demonstrate the performance of the ISL28433 Chopper Stabilized op amp. It features a low 8µV maximum VOS 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 ISL28433TSSOPEVAL1Z can be configured as a precision high-gain (G = 10,000V/V) differential amplifier. External power connections are made through the V+, V-, VREF, and GND connections on the evaluation board.
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