TC7652 데이터 시트보기 (PDF) - TelCom Semiconductor Inc => Microchip
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TC7652 Datasheet PDF : 6 Pages
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LOW NOISE, CHOPPER-STABILIZED
OPERATIONAL AMPLIFIER
1
TC7652
Some Applications
Figures 1 and 2 show basic inverting and noninverting
amplifier circuits using the output clamping circuit 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 (10kΩ load for
full swing). Overcome these limitations with a booster circuit
(Figure 3) 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, monitor loop gain stability.
Figure 4 shows the clamp circuit of a zero-offset com-
2 parator. Because the clamp circuit requires the inverting
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 5 shows how the TC7652 can offset-null high
slew-rate and wideband amplifiers.
Mixing the TC7652 with circuits operating at ±15V
3 requires a lower supply voltage divider with the TC7660
voltage converter circuit operated "backwards." Figure 6
shows an approximate connection.
0.1 µF
0.1 µF
INPUT
+
–
CLAMP R2
TC7652
OUTPUT
R3
R1
Figure 1. Noninverting Amplifier With Optional Clamp
R1
INPUT
R2
CLAMP
–
+
TC7652
OUTPUT
0.1 µF
0.1 µF
Figure 2. Inverting Amplifier With Optional Clamp
–7.5V
+
IN
–
–7.5V
TC7652 0.1
0.1
µF
µF
+15V
+ 741
–
–15V
10 k Ω
OUT
Figure 3. Using 741 to Boost Output Drive Capability
TELCOM SEMICONDUCTOR, INC.
0.1 µF
0.1 µF
TC7652
VIN
+
–
VOUT
4
CLAMP
200 k Ω to 2 MΩ
VTH
Figure 4. Low Offset Comparator
5
TC7652
+
–
22 kΩ
22 kΩ
+
6
IN
OUT
–
FAST
AMPLIFIER
Figure 5. 1437 Offset-Nulled by TC7652
2
8
+15V
7
10 µF
TC 3
7660
465
+7.5V
10 µF
0V
1 MΩ
Figure 6. Splitting +15V With the 7660 at >95% Efficiency
8
3-285
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