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PDF TC7652CPD Data sheet ( Hoja de datos )

Número de pieza TC7652CPD
Descripción LOW NOISE/ CHOPPER-STABILIZED OPERATIONAL AMPLIFIER
Fabricantes TelCom Semiconductor 
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1
TC7652
LOW NOISE, CHOPPER-STABILIZED OPERATIONAL AMPLIFIER
FEATURES
s Low Offset Over Temperature Range ............ 10µV
s Ultra-Low Long-Term Drift ................. 150nV/Month
s Low Temperature Drift ............................. 100nV/°C
s Low DC Input Bias Current ............................. 15pA
s High Gain, CMRR and PSRR ................. 110dB Min
s Low Input Noise Voltage ......... 0.2µVP-P; DC to 1Hz
s Internally-Compensated for Unity-Gain Operation
s Clamp Circuit for Fast Overload Recovery
PIN CONFIGURATIONS
GENERAL DESCRIPTION
The TC7652 is a lower noise version of the TC7650,
sacrificing some input specifications (bias current and band-
width) to achieve a 10x reduction in noise. All the other
benefits of the chopper technique are present, i.e. freedom
from offset adjust, drift, and reliability problems from exter-
nal trim components. Like the TC7650, the TC7652 re-
quires only two noncritical external caps for storing the
chopped null potentials. There are no significant chopping
spikes, internal effects or overrange lockup problems.
2
3
CB 1
CA 2
NC 3
–INPUT 4
+INPUT 5
NC 6
VSS 7
TC7652CPD
14 INT/EXT
13
EXT CLK
IN
12
INT CLK
OUT
11 VDD
10 OUTPUT
9
OUTPUT
CLAMP
8 CRET
CA 1
–INPUT 2
+INPUT 3
8 CB
7 VDD
TC7652CPA 6 OUTPUT
VSS 4
5 CLAMP
ORDERING INFORMATION
Part No.
TC7652CPA
TC7652CPD
Package
8-Pin Plastic DIP
14-Pin Plastic DIP
Temperature
Range
0°C to +70°C
0°C to +70°C
4
NC = NO INTERNAL CONNECTION
(MAY BE USED AS INPUT GUARD)
FUNCTIONAL BLOCK DIAGRAM
5
OUTPUT CLAMP
(NOT ON "Z" PINOUT)
INPUTS
OUTPUT CLAMP
CIRCUIT
MAIN
AMPLIFIER
NULL
OSCILLATOR
AB
B
A
INTERMOD
COMPARATOR
B
NULL
AMPLIFIER
BA
NULL
NOTE: 1. For 8-pin DIP connect to VSS, or to CRET on "Z" pinout.
TELCOM SEMICONDUCTOR, INC.
TC7652
14-PIN DIP ONLY
INT/EXT
EXT CLK IN
CLK OUT
CEXT
OUTPUT
C
EXT
6
7
CRET (NOTE 1)
8VSS
TC7652-7 9/11/96
3-281

1 page




TC7652CPD pdf
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 (10kload 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-
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
requires a lower supply voltage divider with the TC7660
voltage converter circuit operated "backwards." Figure 6
shows an approximate connection.
2
3
0.1 µF
0.1 µF
INPUT
+
CLAMP R2
TC7652
OUTPUT
R3 R1
Figure 1. Noninverting Amplifier With Optional Clamp
INPUT
R1
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
µF
0.1
µF
+15V
+ 741
–15V
10 k
OUT
Figure 3. Using 741 to Boost Output Drive Capability
TELCOM SEMICONDUCTOR, INC.
0.1 µF
0.1 µF
VIN +
CLAMP
200 k to 2 M
TC7652
VOUT
VTH
4
Figure 4. Low Offset Comparator
5
TC7652
+
22 k
22 k
+
IN OUT
FAST
AMPLIFIER
Figure 5. 1437 Offset-Nulled by TC7652
6
10 µF
28
TC 3
7660
465
+15V
+7.5V
10 µF
0V
7
1 M
Figure 6. Splitting +15V With the 7660 at >95% Efficiency
8
3-285

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