TC901CPA [MICROCHIP]
Dual Auto-Zeroed Operational Amplifiers; 双自动调零运算放大器型号: | TC901CPA |
厂家: | MICROCHIP |
描述: | Dual Auto-Zeroed Operational Amplifiers |
文件: | 总6页 (文件大小:54K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
TC901
Dual Auto-Zeroed Operational Amplifiers
FEATURES
GENERAL DESCRIPTION
■ Second-Generation Monolithic,
Chopper-Stabilized Op Amp
■ No External Capacitors Required
■ Single-Supply Operation ........... ±15V or 5V to 32V
■ Supply Current............................ 450µA at 15V, Typ
■ Input Offset Voltage ................................... 7µV, Typ
■ Common-Mode Rejection Ratio ............140dB, Typ
■ Open-Loop Gain ............ 140dB Into 10k Load, Typ
■ Input Noise ......................... 5µV at 10Hz Bandwidth
■ Pinout Compatible With ICL7650
The TC901 is a monolithic, auto-zeroed operational
amplifier. It is a second-generation design of the TC91X
CMOSchopper-stabilizedop-ampswithon-chipcapacitors.
Elimination of the external capacitors allows the de-
signer to increase reliability, lower cost, and simplify design
by lowering parts count.
Since the TC901 is an auto-zeroing op amp, input offset
voltage is very low. More important, there is almost zero drift
with time. This eliminates production line adjustments, as
well as periodic calibration.
■ Lowest Parts Count Chopper Op Amp
Notable electrical characteristics are low supply cur-
rent (450µA, typical), single-supply operation (5V to 32V),
low input offset voltage (7µV, typical), low noise (<5µVP-P
,
PIN CONFIGURATION (DIP and SOIC)
typical, for a 10Hz bandwidth), and fast recovery from
saturation without the use of external clamp circuitry.
This device is supplied in 8-pin plastic DIP and plastic
SOIC packages. It is pin compatible with bipolar, CMOS,
JFET and other chopper-stabilized op-amps using the in-
dustry-standard 741 pinout.
NC
–INPUT
+INPUT
1
2
3
4
8
7
6
5
NC
–INPUT
+INPUT
1
2
3
4
8
7
6
5
NC
V
NC
V
–
–
DD
DD
+
+
OUTPUT
NC
OUTPUT
NC
V
V
SS
SS
TC901COA
TC901CPA
ORDERING INFORMATION
NC = NO INTERNAL CONNECTION
Temperature
Part No.
Package
Range
TC901COA
TC901CPA
8-Pin SOIC
8-Pin Plastic DIP
0°C to +70°C
0°C to +70°C
FUNCTIONAL BLOCK DIAGRAM
V
V
SS
DD
4
7
V
CORRECTION AMPLIFIER
OS
2
+
–INPUT
TC901
–
A
B
INTERNAL
OSCILLATOR
*
(f
≈ 200 Hz)
B
OSC
*
A
+
LOW IMPEDANCE
OUTPUT BUFFER
3
+
+INPUT
6
–
OUTPUT
MAIN
AMPLIFIER
–
NOTE: Internal capacitors. No external capacitors required.
© 2001 Microchip Technology Inc. DS21480A
TC901- 7 9/5/96
Dual Auto-Zeroed Operational Amplifiers
TC901
Package Power Dissipation (TA ≤ 70°C)
ABSOLUTE MAXIMUM RATINGS*
Plastic DIP ......................................................730mW
Plastic SOIC ...................................................470mW
Total Supply Voltage (VDD to VSS) ........................... +36V
Input Voltage ........................ (VDD + 0.3V) to (VSS – 0.3V)
Current Into Any Pin.................................................10mA
While Operating ............................................... 100µA
Storage Temperature Range ................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
Operating Temperature Range
*Static-sensitive device. Appropriate precautions should be taken when
handling, shipping, or storing these devices. Stresses above those listed
under "Absolute Maximum Ratings" may cause permanent damage to the
devices. These are stress ratings only and functional operation of the
device at these or any other conditions above those indicated in the
operational sections of the specifications is not implied.
C Device ................................................ 0°C to +70°C
ELECTRICAL CHARACTERISTICS: VS ±15V, TA = +25°C, unless otherwise indicated.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Units
VOS
Input Offset Voltage
(Figure 2)
TA = +25°C
—
7
15
µV
TCVOS
Average Temperature
Coefficient of Input
Offset Voltage
0°C ≤ TA ≤ +70°C
(Note 1)
—
0.05
0.15
µV/°C
IBIAS
Average Input Bias
Current
TA = +25°C
0°C ≤ TA ≤ +70°C
– 25°C ≤ TA ≤ +85°C
—
—
—
30
0.2
0.2
50
10
10
pA
nA
nA
IOS
Average Input
Offset Current
TA = +25°C
TA = +85°C
—
—
50
—
100
1
pA
nA
eN
Input Voltage Noise
(Figure 1B)
0.1 to 1Hz, RS ≤ 100Ω
—
1.2
—
µVP-P
µVP-P
dB
eN
Input Voltage Noise
(Figure 1A)
0.1 to 10Hz, RS ≤ 100Ω
—
5
—
CMRR
CMVR
Common-Mode Rejection
Ratio
V
SS ≤ VCM ≤ VDD – 2V
120
VSS
140
—
—
Common-Mode Voltage
Range
VS = ±5V to ±15V
VDD –2
V
AOL
Open-Loop Voltage Gain
Output Voltage Swing
RL = 10kΩ, VS = ±15V
RL = 10kΩ
120
VSS + 1
—
140
—
—
VDD –1.2
—
dB
V
VOUT
BW
Closed-Loop Bandwidth
(Figure 7)
Closed-Loop Gain = +1
0.8
MHz
SR
Slew Rate
RL = 10 kW, CL = 50pF
VS = ±5V to ±15V
Note 2
—
120
±3
2
—
—
V/µsec
dB
PSRR
VS
Power Supply Rejection Ratio
140
—
Operating Supply Voltage
Range
±16
V
IS
Quiescent Supply (Figure 2)
VS = ±15V
—
0.45
0.6
mA
NOTES: 1. Characterized; not 100% tested.
2. Single supply operation: VDD = +5V to +32V.
© 2001 Microchip Technology Inc. DS21480A
TC901- 7 9/5/96
2
Dual Auto-Zeroed Operational Amplifiers
TC901
Overload Recovery
Avoiding Latch-Up
The TC901 recovers quickly from output saturation.
Typical recovery time from positive output saturation is 20
msec. Negative output saturation recovery time is typically
msec.
Larger voltages can turn the p-n-p-n device on, causing
excessivedevicepowersupplycurrentandexcessivepower
dissipation. TC901's power supply should be established at
the same time (or before) input signals are applied. If this is
not possible, input current should be limited to 100µA to
avoid triggering the p-n-p-n structure.
Thermocouple Errors
Heating a junction made from two different metallic
wires causes current flow. This is known as the Seebeck
effect. An open-circuit voltage (Seebeck voltage) can be
measured across the junction. Junction temperature and
metal type determine the magnitude. Typical values are
0.1µV/°C to 10µV/°C. Thermal-induced voltages can be
many times larger than the TC901's offset voltage drift.
Unless unwanted thermocouple potentials can be con-
trolled, system performance will be less than optimum.
Unwanted thermocouple junctions are created when
leads are soldered or sockets/connectors are used. Low
thermoelectric coefficient solder can reduce errors. A 60%
Cd/40% Sn Pb solder has one-tenth the thermal voltage of
common 64% Sn/36% Pb solder at a copper junction.
The number and type of dissimilar metallic junctions in
the input circuit loop should be balanced. If the junctions are
kept at the same temperature, their summation will add to
zero, canceling errors (Figure 7).
Pin Compatibility
TheCMOSTC901ispincompatiblewithotherchopper-
stabilized amplifiers, such as the 7650, 7652 and 1052.
Amplifiers such as the 7650 require 0.1µF external capaci-
tors connected to pins 1 and 8. The TC901 includes the
chopper capacitors on-chip, so external capacitors are not
required. Since pins 1, 5 and 8 of the TC901 are not
connected, the TC901 can directly replace other chopper-
stabilized amplifiers in existing circuits.
The TC901 pinout also matches many popular bipolar
and JFET op amps, such as the OP-07, OP-20, LM101,
LM108, 356and741. Inmanyapplicationsthatoperatefrom
±15V power supplies, the TC901 offers superior electrical
performance and is a functional pin-compatible replace-
ment. Offset voltage correction potentiometers, compensa-
tion capacitors, and chopper-stabilization capacitors can be
removed when retrofitting existing equipment designs.
System parts count, assembly time, and system cost are
reduced, while reliability and performance are improved.
Shielding precision analog circuits from air currents —
especially those caused by power dissipating components
and fans — will minimize temperature gradients and mini-
mize thermocouple-induced errors.
Overload Recovery
The TSC90X Series recovers quickly from output
saturation. Typical recovery time from positive output satu-
ration is 20msec. Negative output saturation recovery time
is typically 5msec.
J
J
J
= J
= J
= J
3
2
1
4
5
6
NO TEMPERATURE DIFFERENTIAL
AND SAME METALLIC CONNECTION
J
2
J
1
PACKAGE
PIN
J
3
J
6
J
4
J
5
J
J
1
2
+
–
+
–
V
V
1
–
2
J
J
V
3
3
+
V
= 0
V
= V + V + V – V – V – V = 0
T
T
1
2
3
4
5
6
+
V
4
4
V
V
6
–
5
+
–
+
–
J
J
6
5
Figure 7. Unwanted Thermocouple Errors Eliminated by Reducing
Thermal Gradients and Balancing Junctions
© 2001 Microchip Technology Inc. DS21480A
TC901- 7 9/5/96
3
Dual Auto-Zeroed Operational Amplifiers
TC901
2V
INPUT
2 V/DIV
0V
0V
OUTPUT
5 V/DIV
–15V
0
1
2
3
4
5
6
7
8
9
10
5 msec/DIV
1 sec/DIV
Figure 3. Recovery From Negative Saturation
Figure 1. Input Voltage Noise
V
(µV)
V
(µA)
OS
DD
4
450
2V
400
350
300
6
9
OUTPUT
5 V/DIV
V
OS
10
12
14
16
18
20
22
250
200
150
100
0V
0V
OUTPUT
5 V/DIV
–2V
50
0
20 msec/DIV
0
2
4
6
8
10
±V (V)
12 14 16
18 20
S
Figure 2. VOS and IDD vs Supply Voltage
Figure 4. Recovery From Positive Saturation
+50
+40
+30
+20
+10
0
R2
+240
+180
+120
+60
+15V
R1
–
0°C
OUTPUT
+
–10
PHASE MARGIN
10kΩ with 50 pF LOAD
36° at 700 kHz at 70°C
40° at 800 kHz at 25°C
–20
–30
–120
–180
–15V
GAIN = 40
R1= 1kΩ
R2= 40kΩ
–40
0
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 5. Saturation Test Circuit
Figure 6. Phase-Gain
© 2001 Microchip Technology Inc. DS21480A
TC901- 7 9/5/96
4
Dual Auto-Zeroed Operational Amplifiers
TC901
PACKAGE DIMENSIONS
8-Pin SOIC Narrow
.157 (3.99)
.150 (3.81)
.244 (6.20)
.228 (5.79)
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
8° MAX.
.020 (0.51)
.013 (0.33)
.010 (0.25)
.004 (0.10)
.050 (1.27)
.016 (0.40)
8-Pin Plastic Dip
PIN 1
.260 (6.60)
.240 (6.10)
.045 (1.14)
.030 (0.76)
.070 (1.78)
.040 (1.02)
.310 (7.87)
.290 (7.37)
.400 (10.16)
.348 (8.84)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.015 (0.38)
.008 (0.20)
3° MIN.
.150 (3.81)
.115 (2.92)
.400 (10.16)
.310 (7.87)
.110 (2.79)
.090 (2.29)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
© 2001 Microchip Technology Inc. DS21480A
TC901- 7 9/5/96
5
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01/09/01
All rights reserved. © 2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by
updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is
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reserved. All other trademarks mentioned herein are the property of their respective companies.
© 2001 Microchip Technology Inc. DS21480A
TC901- 7 9/5/96
6
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