TC911BCPA [TELCOM]
AUTO-ZEROED OPERATIONAL AMPLIFIERS; 自稳零运算放大器
| 型号： | TC911BCPA |
| 厂家： | 
TELCOM SEMICONDUCTOR, INC |
| 描述： | AUTO-ZEROED OPERATIONAL AMPLIFIERS |
| 文件： | 总5页 (文件大小：72K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3
TC911A
TC911B
AUTO-ZEROED OPERATIONAL AMPLIFIERS
GENERAL DESCRIPTION
FEATURES
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.
■ First Monolithic Chopper-Stabilized Amplifier
With On-Chip Nulling Capacitors
■ Offset Voltage .................................................... 5µV
■ Offset Voltage Drift .................................. 0.05µV/°C
■ Low Supply Current ...................................... 350µA
■ High Common-Mode Rejection .................... 116dB
■ Single Supply Operation ....................... 4.5V to 16V
■ High Slew Rate............................................. 2.5V/µs
■ Wide Bandwidth............................................1.5MHz
■ High Open-Loop Voltage Gain
(RL = 10 kΩ) .................................................... 120dB
■ Low Input Voltage Noise
(0.1 Hz to 1 Hz) .......................................... 0.65µVP-P
■ Pin Compatible With ICL7650
■ Lower System Parts Count
ORDERING INFORMATION
Maximum
Temperature
Range
Offset
Voltage
Part No.
Package
TC911ACOA
TC911ACPA
8-Pin SOIC 0°C to +70°C
15µV
15µV
8-Pin
0°C to +70°C
Plastic DIP
PIN CONFIGURATION (SOIC and DIP)
TC911BCOA
TC911BCPA
8-Pin SOIC 0°C to +70°C
30µV
30µV
NC
– INPUT
+ INPUT
1
2
3
4
8
7
6
5
NC
– INPUT
+ INPUT
1
2
3
4
8
7
6
5
NC
V
NC
V
8-Pin
Plastic DIP
0°C to +70°C
DD
DD
OUTPUT
NC
OUTPUT
NC
TC911ACOA
TC911BCOA
TC911ACPA
TC911BCPA
V
V
SS
SS
NC = NO INTERNAL CONNECTION
FUNCTIONAL BLOCK DIAGRAM
V
V
SS
DD
4
7
V
CORRECTION AMPLIFIER
OS
2
+
–
–INPUT
A
B
INTERNAL
OSCILLATOR
(f
≈ 200 Hz)
OSC
B
*
*
TC911
A
+
–
LOW IMPEDANCE
OUTPUT BUFFER
3
+
–
+INPUT
6
OUTPUT
MAIN
AMPLIFIER
*NOTE: Internal capacitors. No external capacitors required.
TC911/A/B-7 9/11/96
TELCOM SEMICONDUCTOR, INC.
3-263
AUTO-ZEROED MONOLITHIC
OPERATIONAL AMPLIFIERS
TC911A
TC911B
Package Power Dissipation (TA = ≤ 70°C)
ABSOLUTE MAXIMUM RATINGS*
Plastic DIP ......................................................730mW
Plastic SOIC ...................................................470mW
Total Supply Voltage (VDD to VSS) ........................... +18V
Input Voltage ........................ (VDD + 0.3V) to (VSS – 0.3V)
Current into Any Pin .................................................10mA
While Operating ................................................100µA
Storage Temperature Range ................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
Operating Temperature Range
*Static-sensitive device. Unused devices should be stored in conductive
material. Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these or any other conditions
abovethoseindicatedintheoperationalsectionsofthespecificationsisnot
implied.
C Device ................................................ 0°C to +70°C
ELECTRICAL CHARACTERISTICS: VS = ±5V, TA = +25°C, unless otherwise indicated.
TC911A
TC911B
Symbol Parameter
Test Conditions
Min
Typ
Max
Min
Typ
Max
Unit
VOS
Input Offset Voltage
TA = +25°C
—
5
15
—
15
30
µV
TCVOS
Average Temperature
Coefficient of Input
Offset Voltage
0°C ≤ TA ≤ +70°C
–25°C ≤ TA ≤ +85°C
(Note 1)
—
—
0.05
0.05
0.15
0.15
—
—
0.1
0.1
0.25
0.25
µV/°C
µV/°C
IB
Average Input Bias
Current
TA = +25°C
0°C ≤ TA ≤ +70°C
–25°C ≤ TA ≤ +85°C
—
—
—
—
—
—
70
3
4
—
—
—
—
—
—
120
4
6
pA
nA
nA
IOS
Average Input
Offset Current
TA = +25°C
TA = +85°C
—
—
5
—
20
1
—
—
10
—
40
1
pA
nA
eN
Input Voltage Noise
0.1 to 1 Hz, RS ≤ 100Ω
0.1 to 10 Hz, RS ≤ 100Ω
—
—
0.65
11
—
—
—
—
0.65
11
—
—
µVP-P
µVP-P
CMRR
CMVR
AOL
Common-Mode
Rejection Ratio
VSS ≤ VCM ≤ VDD – 2.2
110
VSS
115
116
—
VDD – 2
—
105
VSS
110
110
—
VDD – 2
—
dB
Common-Mode
Voltage Range
—
—
V
Open-Loop Voltage
Gain
RL = 10 kΩ, VOUT = ±4V
120
120
dB
VOUT
BW
Output Voltage Swing
RL = 10 kΩ
VSS + 0.3
—
—
VDD – 0.9 VSS + 0.3
—
VDD – 0.9
—
V
Closed Loop
Bandwidth
Closed Loop Gain = +1
1.5
—
—
1.5
MHz
SR
Slew Rate
RL = 10 kΩ, CL = 50 pF
±3.3V to ±5.5V
—
2.5
—
—
—
—
2.5
—
—
—
V/µs
PSRR
Power Supply
Rejection Ratio
112
105
dB
VS
IS
Operating Supply
Voltage Range
Split Supply
Single Supply
±3.3
6.5
—
—
±8
16
±3.3
6.5
—
—
±8
16
V
V
Quiescent Supply
Current
VS = ±5V
—
350
600
—
—
800
µA
NOTES: 1. Characterized; not 100% tested.
3-264
TELCOM SEMICONDUCTOR, INC.
AUTO-ZEROED MONOLITHIC
OPERATIONAL AMPLIFIERS
3
TC911A
TC911B
TYPICAL CHARACTERISTICS
Input Offset Voltage vs.
Supply Current vs. Temperature
Common-Mode Voltage
Supply Current vs. ± Supply Voltage
450
35
30
25
20
15
700
600
500
400
300
200
T
= +25°C
V
= ±5V
A
V
T
= ±5V
S
S
= +25°C
A
400
350
300
250
200
10
100
0
5
0
–6 –5 –4 –3 –2 –1
0
1
2
3
4
–100
–50
0
50
100
150
2
3
4
5
6
7
8
AMBIENT TEMPERATURE (°C)
INPUT COMMON-MODE VOLTAGE (V)
± SUPPLY VOLTAGE (V)
Output Voltage Swing vs.
Load Resistance
Large Signal Output
Switching Waveform
Gain and Phase vs. Frequency
5.8
5.0
4.2
50
40
30
20
225
180
135
V
T
R
= ±5V
= +25°C
= 10 k
Ω
T
= +25°C
= ±5V
S
R
T
= 10 kΩ
S
A
L
–SWING
+SWING
V
A
= +25°C
INPUT VERTICAL
SCALE = 2 V/DIV
A
PHASE
L
OUTPUT
VERTICAL
SCALE
GAIN
90
45
10
0
= 1 V/DIV
3.4
2.6
1.8
1.0
0
0V
–45
–90
–135
–180
–10
–20
–30
–40
100
1k
10k
100k
1M
10k
100k
1M
10M
FREQUENCY (Hz)
HORIZONTAL SCALE = 2 µs/DIV
LOAD RESISTANCE (Ω)
TELCOM SEMICONDUCTOR, INC.
3-265
AUTO-ZEROED MONOLITHIC
OPERATIONAL AMPLIFIERS
TC911A
TC911B
(Seebeck voltage) can be measured. Junction temperature
andmetaltypedetermine themagnitude. Typicalvaluesare
0.1µV/°C to 10µV/°C. Thermal-induced voltages can be
manytimeslargerthantheTC911offsetvoltagedrift.Unless
unwanted thermocouple potentials can be controlled, sys-
tem performance will be less than optimum.
Unwanted thermocouple junctions are created when
leads are soldered or sockets/connectors are used. Low
thermo-electric coefficient solder can reduce errors. A 60%
Sn/36% Pb solder has 1/10 the thermal voltage of common
64% Sn/36% Pb solder at a copper junction.
The number and type of dissimilar metallic junctions in
the input circuit loop should be balanced. If the junctions are
kept at the same temperature, their summation will add to
zero-canceling errors (Figure 1).
Shielding precision analog circuits from air currents —
especially those caused by power dissipating components
and fans — will minimize temperature gradients and ther-
mocouple-induced errors.
Pin Compatibility
The CMOS TC911 is pin compatible with the industry
standard ICL7650chopper-stabilizedamplifier.TheICL7650
must use external 0.1µF capacitors connected at pins 1 and
8. With the TC911, external offset voltage error cancel-
ing capacitors are not required. On the TC911 pins 1, 8
and 5 are not connected internally. The ICL7650 uses pin 5
as an optional output clamp connection. External chopper
capacitors and clamp connections are not necessary with
the TC911. External circuits connected to pins 1, 8 and 5 will
have no effect. The TC911 can be quickly evaluated in
existing ICL7650 designs. Since external capacitors are not
required, system part count, assembly time, and total sys-
tem cost are reduced. Reliability is increased and PC board
layout eased by having the error storage capacitors inte-
grated on the TC911 chip.
The TC911 pinout matches many existing op amps:
741, LM101, LM108, OP05–OP08, OP-20, OP-21, ICL7650
and ICL7652. In many applications operating from +5V
supplies the TC911 offers superior electrical performance
and can be a functional pin-compatible replacement. Offset
voltage correction potentiometers, compensation capaci-
tors, and chopper-stabilization capacitors can be removed
when retrofitting existing equipment designs.
Avoiding Latch-Up
Junction-isolated CMOS circuits inherently contain a
parasitic p-n-p-n transistor circuit. Voltages exceeding the
supplies by 0.3V should not be applied to the device pins.
Larger voltages can turn the p-n-p-n device on, causing
excessivedevicepowersupplycurrentandexcessivepower
dissipation. TC911 power supplies should be established at
thesametimeorbeforeinputsignalsareapplied.Ifthisisnot
possible input current should be limited to 0.1mA to avoid
triggering the p-n-p-n structure.
Thermocouple Errors
Heating one joint of a loop made from two different
metallic wires causes current flow. This is known as the
Seebeckeffect.Bybreakingtheloop,anopencircuitvoltage
J
J
J
= J
= J
= J
3
2
1
4
5
6
NO TEMPERATURE DIFFERENTIAL
AND SAME METALLIC CONNECTION
Overload Recovery
J
2
The TC911 recovers quickly from the output saturation.
Typical recovery time from positive output saturation is
20msec. Negative output saturation recovery time is typi-
cally 5msec.
J
1
PACKAGE
PIN
J
3
J
6
J
4
J
5
J
J
1
2
+
–
+
–
V
V
1
–
2
J
V
3
3
+
V
= V + V + V – V – V – V = 0
V = 0
T
T
1
2
3
4
5
6
+
–
J
V
4
4
V
V
6
5
+
–
+
–
J
J
6
5
Figure 1. Unwanted Thermocouple Errors Eliminated by
Reducing Thermal Gradients and Balancing Junctions
3-266
TELCOM SEMICONDUCTOR, INC.
AUTO-ZEROED MONOLITHIC
OPERATIONAL AMPLIFIERS
3
TC911A
TC911B
TYPICAL APPLICATIONS
Thermometer Circuit
10-Volt Precision Reference
+9V
TC911
TEMP
OUT
+15V
18 kΩ
TC911
REF02
ADJ
R
2
3
2
7
4
+
–
6
V
= 10V
OUT
V
REF
R
1
–
0.1 µF
6.4V
V
OUT
+
3.6 kΩ
R
3
6.4 kΩ
R
R
+ R
2
3
1
V
= V
=
1 + R
V
–
]
TEMP[ ( ) [ REF
]
OUT
2
R
R X R
1
1
3
R
+ R
d V
OUT
dT
d (V
)
TEMP
dT
3
1
K (2.1 mV/°C)
≈
1 + R
[ ( )]
2
R X R
3
1
R
2
K = 1 +
R X R
3
1
Programmable Gain Amplifier With Input Multiplexer
+5V –5V
GND
+5V –5V
IN
TC911
X1
1
+
–
V
IN
IN
IN
OUT
2
3
4
IC1b
IC1b
+5V
–5V
X 10
X100
X1000
999 kΩ
A
A A A WR
2 3 4
1
18 kΩ
99 kΩ
INPUT
CHANNEL
SELECT
GND
WR
A
LATCH
GAIN
SELECT
A
A
A
1
2
3 4
2 kΩ
1 kΩ
1 kΩ
68HC11
IC1a, b, = Quad Analog Switch
TELCOM SEMICONDUCTOR, INC.
3-267
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