3-263
TELCOM SEMICONDUCTOR, INC.
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AUTO-ZEROED OPERATIONAL AMPLIFIERS
FEATURES
I
First Monolithic Chopper-Stabilized Amplifier
With On-Chip Nulling Capacitors
Offset Voltage .................................................... 5
μ
V
Offset Voltage Drift .................................. 0.05
μ
V/
°
C
Low Supply Current ...................................... 350
μ
A
High Common-Mode Rejection .................... 116dB
Single Supply Operation.......................4.5V to 16V
High Slew Rate............................................. 2.5V/
μ
s
Wide Bandwidth............................................1.5MHz
High Open-Loop Voltage Gain
(R
L
= 10 k
) .................................................... 120dB
Low Input Voltage Noise
(0.1 Hz to 1 Hz).......................................... 0.65
μ
V
P-P
Pin Compatible With ICL7650
Lower System Parts Count
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GENERAL DESCRIPTION
The TC911 CMOS auto-zeroed operational amplifier is
the first complete monolithic chopper-stabilized amplifier.
Chopper operational amplifiers like the ICL7650/7652 and
LTC1052 require user-supplied, external offset compensa-
tion storage capacitors.
External capacitors are not re-
quired with the TC911.
Just as easy to use as the conven-
tional 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
μ
V maximum offset
voltage, 0.15
μ
V/
°
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
μ
A. 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)
+
–
+
–
VDD
VSS
TC911
–INPUT
+INPUT
A
2
3
4
7
B
*
*
A
B
6
*
NOTE:
Internal capacitors. No external capacitors required.
MAIN
LOW IMPEDANCE
(fOSC
≈
OS
+
–
OUTPUT
1
2
3
4
8
7
6
5
OUTPUT
NC
+ INPUT
V
SS
TC911ACPA
TC911BCPA
– INPUT
NC
NC
V
SS
V
DD
V
DD
OUTPUT
NC = NO INTERNAL CONNECTION
1
2
3
4
8
7
6
5
NC
+ INPUT
TC911ACOA
TC911BCOA
– INPUT
NC
NC
ORDERING INFORMATION
Maximum
Offset
Voltage
Temperature
Range
Part No.
Package
TC911ACOA
TC911ACPA
8-Pin SOIC
8-Pin
Plastic DIP
8-Pin SOIC
8-Pin
Plastic DIP
0
°
C to +70
°
C
0
°
C to +70
°
C
15
μ
V
15
μ
V
TC911BCOA
TC911BCPA
0
°
C to +70
°
C
0
°
C to +70
°
C
30
μ
V
30
μ
V
FUNCTIONAL BLOCK DIAGRAM
TC911/A/B-7 9/11/96
TC911A
TC911B