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PDF TC911A Data sheet ( Hoja de datos )

Número de pieza TC911A
Descripción AUTO-ZEROED OPERATIONAL AMPLIFIERS
Fabricantes TelCom Semiconductor 
Logotipo TelCom Semiconductor Logotipo



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1
TC911A
TC911B
AUTO-ZEROED OPERATIONAL AMPLIFIERS
FEATURES
s First Monolithic Chopper-Stabilized Amplifier
With On-Chip Nulling Capacitors
s Offset Voltage .................................................... 5µV
s Offset Voltage Drift .................................. 0.05µV/°C
s Low Supply Current ...................................... 350µA
s High Common-Mode Rejection .................... 116dB
s Single Supply Operation ....................... 4.5V to 16V
s High Slew Rate ............................................. 2.5V/µs
s Wide Bandwidth ............................................1.5MHz
s High Open-Loop Voltage Gain
(RL = 10 k) .................................................... 120dB
s Low Input Voltage Noise
(0.1 Hz to 1 Hz) .......................................... 0.65µVP-P
s Pin Compatible With ICL7650
s Lower System Parts Count
ORDERING INFORMATION
Part No.
TC911ACOA
TC911ACPA
TC911BCOA
TC911BCPA
Temperature
Package
Range
8-Pin SOIC
8-Pin
Plastic DIP
8-Pin SOIC
8-Pin
Plastic DIP
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Maximum
Offset
Voltage
15µV
15µV
30µV
30µV
FUNCTIONAL BLOCK DIAGRAM
VDD
VSS
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 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.
PIN CONFIGURATION (SOIC and DIP)
NC 1
– INPUT 2
+ INPUT 3
VSS 4
TC911ACPA
TC911BCPA
8 NC
7 VDD
6 OUTPUT
5 NC
NC 1
– INPUT 2
+ INPUT 3
VSS 4
8 NC
7 VDD
TC911ACOA 6 OUTPUT
TC911BCOA 5 NC
NC = NO INTERNAL CONNECTION
2
3
4
5
6
47
–INPUT
2
VOS CORRECTION AMPLIFIER
+
A
B
*B
INTERNAL
OSCILLATOR
(fOSC 200 Hz)
7
+INPUT
3
A
*
+
MAIN
AMPLIFIER
TC911
LOW IMPEDANCE
+ OUTPUT BUFFER
6 OUTPUT
*NOTE: Internal capacitors. No external capacitors required.
TELCOM SEMICONDUCTOR, INC.
TC911/A/B-7 9/11/96
3-263
8

1 page




TC911A pdf
AUTO-ZEROED MONOLITHIC
OPERATIONAL AMPLIFIERS
1
TC911A
TC911B
TYPICAL APPLICATIONS
10-Volt Precision Reference
Thermometer Circuit
+9V
18 k
+15V
TC911
3+ 7
2–
4
6
6.4V
0.1 µF
3.6 k
VOUT = 10V
TEMP
OUT
REF02
ADJ
VREF
R1
TC911
R2
+
R3
VOUT
6.4 k
[ ( )] [ ]VOUT = VTEMP
1 + R2
R3 + R1
R3X R1
VREF
R2
R1
[ ( )]d VOUT =
dT
1 + R2
R +R
31
R3 X R1
d (VTEMP) K (2.1 mV/°C)
dT
K = 1 + R2
R3X R1
Programmable Gain Amplifier With Input Multiplexer
2
3
4
5
+5V –5V
GND
+5V –5V
IN1
IN2 IC1b
IN3
IN4 A1 A2 A3 A4WR
INPUT
CHANNEL
SELECT
IC1b
+
+5V –5V
TC911
VOUT
X 1 X 10
X 100 X1000
18 k 99 k 999 k
6
68HC11
GAIN
SELECT
WR LATCH
A1 A2 A3 A4
GND
2 k
1 k
1 k
7
IC1a, b, = Quad Analog Switch
TELCOM SEMICONDUCTOR, INC.
8
3-267

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