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Application Note 1575
V OUT = ( V IN+ – V IN- ) ? ( R F ? R IN ) + V REF
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:
(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.
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
IN-A
R6
0
C6
OPEN
R14
100
C23
OPEN
R39
1M
FROM OUT_A
V- supply rails. For non-inverting operation with
G = 10,001V/V, the IN- input is grounded and the
TO IN-A
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 Ω resistor should
be installed on the empty R11 pad.
User-selectable Options
(Figures 3 and 4)
IN+A
R5 R15
100 0
C7
OPEN
FIGURE 3. INPUT STAGE
TO IN+A
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
OUT_A
R51
0
R63
0
J13 OUT A
feedback loops.
A voltage divider can be added to establish a power
supply-tracking common mode reference using the VREF
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
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)
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, 100 Ω , 1%, 1/16W, ROHS
RESISTOR, SMD, 0603, 10M Ω , 1%, 1/16W, ROHS
RESISTOR, SMD, 0603, DNP-PLACE HOLDER, ROHS
ISL28433FBZ (SOIC), ISL28433FVZ (TSSOP),
IC-RAIL-TO-RAIL OP AMP, ROHS
2
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
AN1575.0
October 1, 2010
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