TC911A Datasheet, PDF (5/7 Pages) TelCom Semiconductor, Inc – AUTO-ZEROED OPERATIONAL AMPLIFIERS

Monolithic Auto-Zeroed Operational Amplifers
TC911A
TC911B
TYPICAL APPLICATIONS
10-Volt Precision Reference
18 kΩ
+15V
TC911
3+ 7
6
2_–
4
6.4V
0.1 µF
3.6 kΩ
VOUT = 10V
Thermometer Circuit
+9V
TEMP
OUT
REF02
ADJ
TC911
R2
VREF
R1
–
+
R3
VOUT
6.4 kΩ
[ ( )] [ ] ^{VOUT = VTEMP}
1 + R2
R3 + R1
R3X R1
–
VREF
R2
R1
[ ( )] d VOUT =
dT
1 + R2
R +R
31
R3X R1
d (VTEMP) _{≈K (2.1 mV/°C)}
dT
K = 1 + ^R2
R3X R1
Programmable Gain Amplifier With Input Multiplexer
+5V –5V
GND
+5V –5V
IN1
IN2
IC1b
IN3
IN4
A1 A2 A3 A4WR
INPUT
CHANNEL
SELECT
IC1b
+
–
+5V –5V
TC911
VOUT
X1
X 10
X 100 X1000
18 k Ω 99 k Ω 999 kΩ
68HC11
GAIN
SELECT
WR LATCH
A1 A2 A3 A4
GND
2 kΩ
1 kΩ
1 kΩ
IC1a, b, = Quad Analog Switch
© 2001 Microchip Technology Inc. DS21481A
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