MICROCHIP TC901COA

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
■ Lowest Parts Count Chopper Op Amp
The TC901 is a monolithic, auto-zeroed operational
amplifier. It is a second-generation design of the TC91X
CMOS chopper-stabilized op-amps with on-chip capacitors.
Elimination of the external capacitors allows the designer 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.
Notable electrical characteristics are low supply current (450µA, typical), single-supply operation (5V to 32V),
low input offset voltage (7µV, typical), low noise (<5µVP-P,
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 industry-standard 741 pinout.
PIN CONFIGURATION (DIP and SOIC)
–INPUT 2
+INPUT 3
VSS 4
NC 1
8 NC
NC 1
–
7 VDD
6 OUTPUT
+
TC901CPA
8 NC
–
–INPUT 2
+INPUT 3
VSS 4
5 NC
7 VDD
+
6 OUTPUT
ORDERING INFORMATION
TC901COA 5 NC
NC = NO INTERNAL CONNECTION
Part No.
Package
TC901COA
TC901CPA
8-Pin SOIC
8-Pin Plastic DIP
Temperature
Range
0°C to +70°C
0°C to +70°C
FUNCTIONAL BLOCK DIAGRAM
–INPUT
2
VDD
VSS
4
7
+
VOS CORRECTION AMPLIFIER
TC901
–
A
INTERNAL
OSCILLATOR
(fOSC ≈ 200 Hz)
B
*
B
*
A
+INPUT
3
+
+
–
MAIN
AMPLIFIER
LOW IMPEDANCE
OUTPUT BUFFER
6
OUTPUT
–
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)
Plastic DIP ......................................................730mW
Plastic SOIC ................................................... 470mW
ABSOLUTE MAXIMUM RATINGS*
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
C Device ................................................ 0°C to +70°C
*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.
ELECTRICAL CHARACTERISTICS: VS ±15V, TA = +25°C, unless otherwise indicated.
Symbol
Parameter
Test Conditions
VOS
Input Offset Voltage
(Figure 2)
Average Temperature
Coefficient of Input
Offset Voltage
Average Input Bias
Current
TCVOS
IBIAS
IOS
eN
eN
CMRR
CMVR
AOL
VOUT
BW
SR
PSRR
VS
IS
Average Input
Offset Current
Input Voltage Noise
(Figure 1B)
Input Voltage Noise
(Figure 1A)
Common-Mode Rejection
Ratio
Common-Mode Voltage
Range
Open-Loop Voltage Gain
Output Voltage Swing
Closed-Loop Bandwidth
(Figure 7)
Slew Rate
Power Supply Rejection Ratio
Operating Supply Voltage
Range
Quiescent Supply (Figure 2)
Min
Typ
Max
TA = +25°C
—
7
15
0°C ≤ TA ≤ +70°C
(Note 1)
—
0.05
0.15
µV/°C
TA = +25°C
0°C ≤ TA ≤ +70°C
– 25°C ≤ TA ≤ +85°C
TA = +25°C
TA = +85°C
0.1 to 1Hz, RS ≤ 100Ω
—
—
—
—
—
—
30
0.2
0.2
50
—
1.2
50
10
10
100
1
—
pA
nA
nA
pA
nA
µVP-P
0.1 to 10Hz, RS ≤ 100Ω
—
5
—
µVP-P
VSS ≤ VCM ≤ VDD – 2V
120
140
—
dB
VS = ±5V to ±15V
VSS
—
VDD –2
V
RL = 10kΩ, VS = ±15V
RL = 10kΩ
Closed-Loop Gain = +1
120
VSS + 1
—
140
—
0.8
—
VDD –1.2
—
RL = 10 kW, CL = 50pF
VS = ±5V to ±15V
Note 2
—
120
±3
2
140
—
—
—
±16
V/µsec
dB
V
—
0.45
0.6
mA
VS = ±15V
Units
µV
dB
V
MHz
NOTES: 1. Characterized; not 100% tested.
2. Single supply operation: VDD = +5V to +32V.
TC901- 7 9/5/96
2
© 2001 Microchip Technology Inc.
DS21480A
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
excessive device power supply current and excessive power
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 controlled, 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).
Shielding precision analog circuits from air currents —
especially those caused by power dissipating components
and fans — will minimize temperature gradients and minimize thermocouple-induced errors.
J3 = J4
J2 = J5 NO TEMPERATURE DIFFERENTIAL
AND SAME METALLIC CONNECTION
J1 = J6
J2
J1
J3
Pin Compatibility
The CMOS TC901 is pin compatible with other chopperstabilized amplifiers, such as the 7650, 7652 and 1052.
Amplifiers such as the 7650 require 0.1µF external capacitors 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 chopperstabilized 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, 356 and 741. In many applications that operate from
±15V power supplies, the TC901 offers superior electrical
performance and is a functional pin-compatible replacement. Offset voltage correction potentiometers, compensation 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.
Overload Recovery
The TSC90X Series recovers quickly from output
saturation. Typical recovery time from positive output saturation is 20msec. Negative output saturation recovery time
is typically 5msec.
PACKAGE
PIN
J6
J4
J5
+
–
J2
V2
–
+
J1
V1
–
J3 V3
+
VT = V1 + V2 + V3 – V4 – V5 – V6 = 0
+
J4 V4
–
+
V5
–
J5
+
VT = 0
V6
–
J6
Figure 7. Unwanted Thermocouple Errors Eliminated by Reducing
Thermal Gradients and Balancing Junctions
© 2001 Microchip Technology Inc.
DS21480A
3
TC901- 7 9/5/96
Dual Auto-Zeroed Operational Amplifiers
(A) 0.1 TO 1.0 Hz
1 µV/DIV
TC901
2V
INPUT
2 V/DIV 0V
(B) 0.1 TO1.0 Hz
1 µV/DIV
0V
OUTPUT
5 V/DIV
–15V
0
1
2
3
4
5
6
7
8
9
10
5 msec/DIV
1 sec/DIV
Figure 1.
Figure 3. Recovery From Negative Saturation
Input Voltage Noise
VOS (µV)
4
VDD (µA)
450
2V
400
6
9
OUTPUT
5 V/DIV
350
VOS
10
300
12
250
14
200
16
150
18
100
20
50
0V
OUTPUT 0V
5 V/DIV
–2V
0
22
0
2
4
6
8
10
12
14
16
18
20 msec/DIV
20
±VS (V)
Figure 2.
VOS and IDD vs Supply Voltage
Figure 4. Recovery From Positive Saturation
+50
R1
GAIN (dB)
R2
+15V
–
+
–15V
OUTPUT
+40
+240
+30
+180
+20
+120
+10
+60
0
0°C
–10
PHASE MARGIN
10kΩ with 50 pF LOAD
36° at 700 kHz at 70°C
40° at 800 kHz at 25°C
–20
GAIN = 40
R1= 1kΩ
R2= 40kΩ
–30
–120
–180
–40
0
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 5. Saturation Test Circuit
TC901- 7 9/5/96
Figure 6. Phase-Gain
4
© 2001 Microchip Technology Inc.
DS21480A
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) .010 (0.25)
.013 (0.33) .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)
.150 (3.81)
.115 (2.92)
.110 (2.79)
.090 (2.29)
.015 (0.38)
.008 (0.20)
3° MIN.
.400 (10.16)
.310 (7.87)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
© 2001 Microchip Technology Inc.
DS21480A
5
TC901- 7 9/5/96
Dual Auto-Zeroed Operational Amplifiers
TC901
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01/09/01
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TC901- 7 9/5/96
6
© 2001 Microchip Technology Inc.
DS21480A