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ICL7650S Datasheet(PDF) 6 Page - Intersil Corporation

Part No. ICL7650S
Description  2MHz, Super Chopper-Stabilized Operational Amplifier
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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 6 page
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6
PIN COMPATIBILITY
The basic pinout of the 8-pin device corresponds, where
possible, to that of the industry standard 8-pin devices, the
LM741, LM101, etc. The null-storing external capacitors are
connected to pins 1 and 8, usually used for offset null or
compensation capacitors, or simply not connected. In the
case of the OP-05 and OP-07 devices, the replacement of
the offset-null pot, connected between pins 1 and 8 and V+,
by two capacitors from those pins to pin 5, will provide easy
compatibility. As for the LM108, replacement of the
compensation capacitor between pins 1 and 8 by the two
capacitors to pin 5 is all that is necessary. The same
operation, with the removal of any connection to pin 5, will
suffice for the LM101,
µA748, and similar parts.
The 14-pin device pinout corresponds most closely to that of
the LM108 device, owing to the provision of “NC” pins for
guarding between the input and all other pins. Since this
device does not use any of the extra pins, and has no
provision for offset-nulling, but requires a compensation
capacitor, some changes will be required in layout to convert
it to the ICL7650S.
Typical Applications
Clearly the applications of the ICL7650S will mirror those of
other op amps. Anywhere that the performance of a circuit
can be significantly improved by a reduction of input-offset
voltage and bias current, the ICL7650S is the logical choice.
Basic non-inverting and inverting amplifier circuits are shown
in Figures 2 and 3. Both circuits can use the output clamping
circuit to enhance the overload recovery performance. The
only limitations on the replacement of other op amps by the
ICL7650S are the supply voltage (
±8V Max) and the output
drive capability (10k
Ω load for full swing). Even these
limitations can be overcome using a simple booster circuit,
as shown in Figure 4, to enable the full output capabilities of
the LM741 (or any other standard device) to be combined
with the input capabilities of the ICL7650S. The pair form a
composite device, so loop gain stability, when the feedback
network is added, should be watched carefully.
Figure 5 shows the use of the clamp circuit to advantage in a
zero-offset comparator. The usual problems in using a
chopper stabilized amplifier in this application are avoided,
since the clamp circuit forces the inverting input to follow the
input signal. The threshold input must tolerate the output
clamp current
≈ VlN/R without disturbing other portions of
the system.
The pin configuration of the 14 pin dual in-line package is
designed to facilitate guarding, since the pins adjacent to the
inputs are not used (this is different from the standard 741 and
101A pin configuration, but corresponds to that of the LM108).
FIGURE 1A. INVERTING AMPLIFIER
FIGURE 1B. FOLLOWER
FIGURE 1C. NON-INVERTING AMPLIFIER
FIGURE 1D. BOARD LAYOUT FOR INPUT GUARDING WITH
TO-99 PACKAGE
FIGURE 1. CONNECTION OF INPUT GUARDS
+
-
INPUT
R1
R2
OUTPUT
+
-
INPUT
OUTPUT
+
-
INPUT
R1
R2
OUTPUT
R
1 R2
R
1
R
2
+
----------------------
NOTE:
SHOULD BE LOW
IMPEDANCE FOR
OPTIMUM GUARDING
EXTERNAL
CAPACITORS
1
8
7
6
5
4
V+
OUTPUT
CRETN
V-
GUARD
BOTTOM VIEW
2
3
7650S
+
-
0.1
µF
OUTPUT
C
R
C
R2
R1
R3
CLAMP
INPUT
0.1
µF
R3 + (R1||R2) ≥ 100kΩ
For Full Clamp Effect
NOTE: R1||R2 indicates the parallel combination of R1 and R2.
FIGURE 2. NON INVERTING AMPLIFIER WITH OPTIONAL CLAMP
ICL7650S




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