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TC7652 View Datasheet(PDF) - Microchip Technology

Part NameDescriptionManufacturer
TC7652 Low Noise, Chopper Stabilized Operational Amplifier Microchip
Microchip Technology Microchip
TC7652 Datasheet PDF : 16 Pages
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TC7652
4.6 Pin Compatibility
Where possible, the 8-pin device pinout conforms to
such industry standards as the LM101 and LM741. Null
storing external capacitors connect to Pins 1 and 8,
which are usually for offset null or compensation capac-
itors. Output clamp (Pin 5) is similarly used. For OP05
and OP07 devices, replacement of the offset null
potentiometer (connected between Pins 1 and 8 and
VDD by two capacitors from those pins to VSS) provides
compatibility. Replacing the compensation capacitor
between Pins 1 and 8 by two capacitors to VSS is
required. The same operation (with the removal of any
connection to Pin 5) works for LM101, µA748 and sim-
ilar parts.
Because NC pins provide guarding between input and
other pins, the 14-pin device pinout conforms closely to
the LM108. Because this device does not use any extra
pins and does not provide offset nulling (but requires a
compensation capacitor), some layout changes are
necessary to convert to the TC7652.
4.7 Some Applications
Figures 4-2 and 4-3 show basic inverting and nonin-
verting amplifier circuits using the output clamping cir-
cuit to enhance overload recovery performance. The
only limitations on replacing other op amps with the
TC7652 are supply voltage (±8V maximum) and output
drive capability (10kload for full swing). Overcome
these limitations with a booster circuit (Figure 4-4) to
combine output capabilities of the LM741 (or other
standard device) with input capabilities of the TC7652.
These two form a composite device, therefore, when
adding the feedback network, the monitor loop gains
stability.
FIGURE 4-2:
NONINVERTING
AMPLIFIER WITH
OPTIONAL CLAMP
0.1µF
Input
0.1µF
+
Clamp R2
TC7652
Output
R3
R1
FIGURE 4-3:
R1
Input
INVERTING AMPLIFIER
WITH OPTIONAL CLAMP
R2
Clamp
+
TC7652
Output
0.1µF
0.1µF
FIGURE 4-4:
USING 741 TO BOOST
OUTPUT DRIVE
CAPABILITY
TC7652
-7.5V
+
In
-7.5V
0.1
µF
+15V
+ 741
Out
-15V
0.1
µF
10k
Figure 4-5 shows the clamp circuit of a zero offset com-
parator. Because the clamp circuit requires the invert-
ing input to follow the input signal, problems with a
chopper stabilized op amp are avoided. The threshold
input must tolerate the output clamp current VIN/R
without disrupting other parts of the system.
Figure 4-6 shows how the TC7652 can offset null high
slew rate and wideband amplifiers.
Mixing the TC7652 with circuits operating at ±15V
requires a lower supply voltage divider with the TC7660
voltage converter circuit operated "backwards." Figure
4-7 shows an approximate connection.
FIGURE 4-5:
LOW OFFSET
COMPARATOR
0.1µF
0.1µF
VIN
+
Clamp
200kto 2m
TC7652
VOUT
VTH
DS21464B-page 8
© 2002 Microchip Technology Inc.
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