3-269
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS
FEATURES
■ First Monolithic Dual Auto-Zeroed Operational
Amplifier
■ Chopper Amplifier Performance Without External
Capacitors
—V
OS
........................................................ 15µV Max
—V
OS
Drift ....................................... 0.15µV/°C Max
— Saves Cost/Assembly of Four "Chopper"
Capacitors
■ SOIC Packages Available
■ High DC Gain ................................................. 120dB
■ Low Supply Current ...................................... 650µA
■ Low Input Voltage Noise
(0.1 Hz to 10 Hz) ........................................ 0.65µV
P-P
■ Wide Common-Mode
Voltage Range................................. V
SS
to V
DD
– 2V
■ High Common-Mode Rejection .................... 116dB
■ Dual or Single Supply Operation ....±3.3V to ±8.3V
+6.5V to +16V
■ Excellent AC Operating Characteristics
— Slew Rate ............................................. 2.5V/µsec
— Unity-Gain Bandwidth .............................1.5MHz
■ Pin Compatible With LM358, OP-14, MC1458,
ICL7621, TL082, TLC322
GENERAL DESCRIPTION
The TC913 is the world's first complete monolithic,
dual auto-zeroed operational amplifier. The TC913 sets a
new standard for low-power, precision dual-operational
amplifiers. Chopper-stabilized or auto-zeroed amplifiers
offer low offset voltage errors by periodically sampling
offset error, and storing correction voltages on capacitors.
Previous single amplifier designs required two user-sup-
plied, external 0.1µF error storage correction capacitors —
much too large for on-chip integration. The unique TC913
architecture requires smaller capacitors, making on-chip
integration possible. Microvolt offset levels are achieved
and external capacitors are not required.
The TC913 system benefits are apparent when con-
trasted with a TC7650 chopper amplifier circuit implemen-
tation. A single TC913 replaces two TC7650's and four
capacitors. Five components and assembly steps are elimi-
nated.
The TC913 pinout matches many popular dual-
operational amplifiers: OP-04, TLC322, LM358, and
ICL7621 are typical examples. In many applications,
operating from dual 5V power supplies or single supplies,
the TC913 offers superior electrical performance, and can
be a functional drop-in replacement; printed circuit board
rework is not necessary. The TC913's low offset voltage
error eliminates offset voltage trim potentiometers often
needed with bipolar and low-accuracy CMOS operational
amplifiers.
The TC913 takes full advantage of TelCom's propri-
etary CMOS technology. Unity gain bandwidth is 1.5 MHz
and slew rate is 2.5 V/µsec.
–
+
+
–
V
DD
V
SS
TC913
A
48
B
*
A
B
*NOTE: Internal capacitors. No external capacitors required.
MAIN
AMPLIFIER
LOW IMPEDANCE
OUTPUT BUFFER
INTERNAL
OSCILLATOR
(f 200 Hz)
OSC
≈
V CORRECTION AMPLIFIER
OS
+
–
–INPUT A
–INPUT B
1 OF 2 AMPLIFIERS SHOWN
OUTPUT A
2
6
–INPUT A
–INPUT B
3
5
OUTPUT B
7
1
*
FUNCTIONAL BLOCK DIAGRAM
ORDERING INFORMATION
Maximum
Temp. Offset
Part No. Package Range Voltage
TC913ACOA 8-Pin SOIC 0°C to +70°C15µV
TC913ACPA 8-Pin Plastic DIP 0°C to +70°C15µV
TC913BCOA 8-Pin SOIC 0°C to +70°C30µV
TC913BCPA 8-Pin Plastic DIP 0°C to +70°C30µV
PIN CONFIGURATION (SOIC and DIP)
1
2
3
4
6
5
–IN B
7
8OUT A
–IN A
+IN A
V
SS
V
SS
V
DD
V
DD
+IN B
TC913ACPA
TC913BCPA
TC913ACOA
TC913BCOA
OUT B
+
–
–
+
A
B
1
2
3
4
6
5
–IN B
7
8OUT A
–IN A
+IN A
+IN B
OUT B
+
–
–
+
A
B
TC913A/B-8 9/3/96
TC913A
TC913B
