tc911a Microchip Technology Inc., tc911a Datasheet - Page 2

• Manufacturer Part Number: tc911a
• Description: Monolithic Auto-zeroed Operational Amplifiers
• Manufacturer: Microchip Technology Inc.

TC911A/TC911B
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 off-
set compensation storage capacitors. External capac-
itors 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 reli-
Functional Block Diagram
DS21481C-page 2
+Input
-Input
2
3
Note: Internal capacitors. No external capacitors required.
TC911A
TC911B
A
V
DD
4
+
–
+
–
V
OS
*
Main Amplifier
Correction Amplifier
V
SS
*
7
ability, reduced PC board layout effort and greater
board area utilization. Space savings can be significant
in multiple amplifier designs.
Electrical specifications include 15μV maximum offset
voltage and 0.15μV/°C maximum offset voltage tem-
perature co-efficient. Offset voltage error is five times
lower than the premium OP07E bipolar device. The
TC911 improves offset 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 bat-
tery operation possible. The TC911 is available in 2
package types: 8-pin plastic DIP and SOIC.
B
A
B
+
–
Low Impedance
Output Buffer
(F
Internal Oscillator
OSC
© 2005 Microchip Technology Inc.
200HZ)
6
Output