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ISL28233MSOPEVAL2Z Arkusz danych(PDF) 2 Page - Intersil Corporation

Numer części ISL28233MSOPEVAL2Z
Szczegółowy opis  ISL28233MSOPEVAL2Z Evaluation Board User?셲 Guide
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL28233MSOPEVAL2Z Arkusz danych(HTML) 2 Page - Intersil Corporation

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AN1569.1
October 5, 2010
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 10,000. 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 0Ω resistor
should be installed on the empty R5 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 (Figure 3, R18 and R15) can be added
to establish a power supply-tracking common mode
reference using 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) 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.
FIGURE 2. POWER SUPPLY CIRCUIT
2
1µF
1µF
2
3
3
C5
C4
C2
D1
VREF
V+
V-
0.01µF
0.01µF
C5
CLOSE
TO DUT
VOUT
VIN+
(
VIN-) RF
(
RIN)
VREF
+
=
(EQ. 1)
IN+A
IN-A
DNP
R4
J2
J1
R1
R2
R14
R18
R15
R13
R11
100
DNP
0
100
DNP
1M
OPEN
100k
VREF
TO INA -
TO INA +
FROM OUTA
FIGURE 3. INPUT STAGE
C6
OUT A
R26
J12
0
FIGURE 4. OUTPUT STAGE
C6
OUT_A
TABLE 1. ISL28233MSOPEVAL2Z COMPONENTS PARTS LIST
DEVICE #
DESCRIPTION
COMMENTS
C2, C4
CAP, SMD, 1206, 1µF, 50V, 10%, X7R, ROHS
Power Supply Decoupling
C3, C5
CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R, ROHS
Power Supply Decoupling
C1, C6, C7, C8, C9, C10
CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS
User selectable capacitors - not populated
R11, R14, R21, R24
RESISTOR, SMD, 0603, 100Ω, 1%, 1/16W, ROHS
Gain Setting Resistor
R13, R23
RESISTOR, SMD, 0603, 10MΩ, 1%, 1/16W, ROHS
Gain Setting Feedback Resistor
R1, R2, R3, R5, R6, R7, R8, R10,
R12, R15, R17, R20, R22, R28,
R29, R30, R32, R34, R35, R36
RESISTOR, SMD, 0603, DNP-PLACE HOLDER, ROHS
User selectable resistors - not populated
D1
40V SERIES SCHOTTKY BARRIER DIODE
Reverse Power Protection
U1 (ISL28233FUZ)
ISL28233FUZ, IC-RAIL-TO-RAIL OP AMP, MSOP, ROHS
Application Note 1569


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