TC911A
TC911B
Monolithic Auto-Zeroed Operational Amplifers
GENERAL DESCRIPTION
FEATURES
The TC911 CMOS auto-zeroed operational amplifier
is the first complete monolithic chopper-stabilized ampli-
fier. Chopper operational amplifiers like the ICL7650/7652
and LTC1052 require user-supplied, external offset com-
pensation storage capacitors. External capacitors are
not required with the TC911. Just as easy to use as the
conventional OP07 type amplifier, the TC911 significantly
reduces offset voltage errors. Pinout matches the OP07/
741/7650 8-pin mini-DIP configuration.
Several system benefits arise by eliminating the exter-
nal chopper capacitors: lower system parts count, reduced
assembly time and cost, greater system reliability, reduced
PC board layout effort and greater board area utilization.
Space savings can be significant in multiple-amplifier de-
signs.
■ First Monolithic Chopper-Stabilized Amplifier
With On-Chip Nulling Capacitors
■ Offset Voltage .................................................... 5µV
■ Offset Voltage Drift .................................. 0.05µV/°C
■ Low Supply Current ...................................... 350µA
■ High Common-Mode Rejection .................... 116dB
■ Single Supply Operation .......................4.5V to 16V
■ High Slew Rate......................................... 2.5V/µsec
■ Wide Bandwidth............................................1.5MHz
■ High Open-Loop Voltage Gain
(RL = 10kΩ) ..................................................... 120dB
■ Low Input Voltage Noise
(0.1Hz to 1Hz) ............................................ 0.65µVP-P
■ Pin Compatible With ICL7650
■ Lower System Parts Count
Electrical specifications include 15µV maximum offset
voltage, 0.15µV/°C maximum offset voltage temperature
coefficient. Offset voltage error is five times lower than the
premium OP07E bipolar device. The TC911 improves off-
set drift performance by eight times.
The TC911 operates from dual or single power sup-
plies. Supply current is typically 350µA. Single 4.5V to 16V
supply operation is possible, making single 9V battery
operation possible. The TC911 is available in 2 package
types: 8-pin plastic DIP and SOIC.
ORDERING INFORMATION
Maximum
Offset
Voltage
Temperature
Range
Part No.
Package
TC911ACOA
TC911ACPA
8-Pin SOIC 0°C to +70°C
15µV
15µV
8-Pin
0°C to +70°C
Plastic DIP
PIN CONFIGURATION (SOIC and DIP)
TC911BCOA
TC911BCPA
8-Pin SOIC 0°C to +70°C
30µV
30µV
8-Pin
Plastic DIP
0°C to +70°C
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
TC911ACOA
TC911BCOA
TC911ACPA
TC911BCPA
OUTPUT
NC
OUTPUT
NC
V
V
SS
SS
NC = NO INTERNAL CONNECTION
FUNCTIONAL BLOCK DIAGRAM
V
V
SS
DD
4
7
V
CORRECTION AMPLIFIER
A
OS
2
+
–INPUT
INTERNAL
OSCILLATOR
(f ≈ 200 Hz)
–
B
B
OSC
*
*
TC911
A
+
–
LOW IMPEDANCE
OUTPUT BUFFER
3
+
–
+INPUT
6
OUTPUT
MAIN
AMPLIFIER
*NOTE: Internal capacitors. No external capacitors required.
© 2001 Microchip Technology Inc. DS21481A
TC911/A/B-7 9/11/96