TC911A
TC911B
Monolithic Auto-Zeroed Operational Amplifers
FEATURES
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First Monolithic Chopper-Stabilized Amplifier
With On-Chip Nulling Capacitors
Offset Voltage .................................................... 5
碌
V
Offset Voltage Drift .................................. 0.05
碌
V/
擄
C
Low Supply Current ...................................... 350
碌
A
High Common-Mode Rejection .................... 116dB
Single Supply Operation ....................... 4.5V to 16V
High Slew Rate ......................................... 2.5V/
碌
sec
Wide Bandwidth ............................................ 1.5MHz
High Open-Loop Voltage Gain
(R
L
= 10k鈩? ..................................................... 120dB
Low Input Voltage Noise
(0.1Hz to 1Hz) ............................................ 0.65
碌
V
P-P
Pin Compatible With ICL7650
Lower System Parts Count
GENERAL DESCRIPTION
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.
Electrical specifications include 15碌V maximum offset
voltage, 0.15碌V/擄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 350碌A(chǔ). 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.
PIN CONFIGURATION
(SOIC and DIP)
NC 1
鈥?INPUT 2
+ INPUT 3
V
SS
4
TC911ACPA
TC911BCPA
8 NC
7 V
DD
6 OUTPUT
5 NC
NC 1
鈥?INPUT 2
+ INPUT 3
V
SS
4
8 NC
7 V
DD
TC911ACOA
TC911BCOA 6 OUTPUT
5 NC
ORDERING INFORMATION
Temperature
Range
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
Part No.
TC911ACOA
TC911ACPA
TC911BCOA
TC911BCPA
Package
8-Pin SOIC
8-Pin
Plastic DIP
8-Pin SOIC
8-Pin
Plastic DIP
Maximum
Offset
Voltage
15碌V
15碌V
30碌V
30碌V
FUNCTIONAL BLOCK DIAGRAM
VDD
4
VSS
7
V CORRECTION AMPLIFIER
OS
A
鈥?/div>
B
B
NC = NO INTERNAL CONNECTION
鈥揑NPUT
2
+
INTERNAL
OSCILLATOR
(fOSC
鈮?/div>
200 Hz)
*
*
A
+INPUT
3
+
TC911
LOW IMPEDANCE
OUTPUT BUFFER
+
鈥?/div>
MAIN
AMPLIFIER
鈥?/div>
6
OUTPUT
*
NOTE:
Internal capacitors. No external capacitors required.
漏 2001 Microchip Technology Inc.
DS21481A
TC911/A/B-7 9/11/96
MICROCHIP
1
2
3
4
5
6
7
