TC913A [TELCOM]
DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS; 双自动调零运算放大器
| 型号： | TC913A |
| 厂家： | 
TELCOM SEMICONDUCTOR, INC |
| 描述： | DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS |
| 文件： | 总4页 (文件大小：51K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3
TC913A
TC913B
DUAL AUTO-ZEROED OPERATIONAL AMPLIFIERS
GENERAL DESCRIPTION
FEATURES
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.
■ First Monolithic Dual Auto-Zeroed Operational
Amplifier
■ Chopper Amplifier Performance Without External
Capacitors
— VOS ........................................................ 15µV Max
— VOS 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) ........................................ 0.65µVP-P
■ Wide Common-Mode
Voltage Range................................. VSS to VDD – 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
ORDERING INFORMATION
Maximum
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.
Temp.
Range
Offset
Voltage
Part No.
Package
TC913ACOA
TC913ACPA
TC913BCOA
TC913BCPA
8-Pin SOIC
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
15µV
15µV
30µV
30µV
8-Pin Plastic DIP
8-Pin SOIC
8-Pin Plastic DIP
FUNCTIONAL BLOCK DIAGRAM
V
V
DD
SS
PIN CONFIGURATION (SOIC and DIP)
4
8
V
CORRECTION AMPLIFIER
OS
+
A
B
A
INTERNAL
–
OSCILLATOR
V
1
DD
8
1
2
3
4
OUT A
–IN A
+IN A
OUT A
–IN A
+IN A
8
7
6
5
≈
200 Hz)
OSC
V
(f
A
+
A
+
DD
B
*
B
B
–
–
2
3
4
7
6
5
OUT B
–IN B
+IN B
OUT B
*
+
–
+
–
–IN B
+IN B
LOW IMPEDANCE
OUTPUT BUFFER
TC913
–INPUT A
–INPUT B
–INPUT A
–INPUT B
2
6
5
V
–
+
V
SS
SS
+
OUTPUT A
OUTPUT B
1
7
3
–
MAIN
AMPLIFIER
TC913ACOA
TC913BCOA
TC913ACPA
TC913BCPA
1 OF 2 AMPLIFIERS SHOWN
*NOTE: Internal capacitors. No external capacitors required.
TC913A/B-8 9/3/96
TELCOM SEMICONDUCTOR, INC.
3-269
DUALAUTO-ZEROED
OPERATIONAL AMPLIFIERS
TC913A
TC913B
Package Power Dissipation (TA = ≤ 70°C)
ABSOLUTE MAXIMUM RATINGS*
Plastic SOIC ...................................................470mW
Plastic DIP ......................................................730mW
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.
TC913A
Typ
TC913B
Typ
Symbol Parameter
Test Conditions
Min
Max
Min
Max
Unit
VOS
Input Offset Voltage
TA = +25°C
—
5
15
—
15
30
µV
TCVOS
Average Temperature 0°C ≤ TA ≤ +70°C
—
—
0.05
0.05
0.15
0.15
—
—
0.1
0.1
0.25
0.25
µV/°C
µV/°C
Coefficient of Input
Offset Voltage
–25°C ≤ TA ≤ +85°C
(Note 1)
IB
Average Input Bias
Current
TA = +25°C
0°C ≤ TA ≤ +70°C
–25°C ≤ TA ≤ +85°C
—
—
—
—
—
—
90
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
—
—
0.6
11
—
—
—
—
0.6
11
—
—
µVP-P
µVP-P
CMRR
CMVR
AOL
Common-Mode
Rejection Ratio
VSS ≤ VCM ≤ VDD – 2.2V
110
VSS
115
116
—
VDD – 2
—
100
VSS
110
110
—
VDD – 2
—
dB
Common-Mode
Voltage Range
—
—
V
Open-Loop Voltage
Gain
RL = 10 kΩ, VO = ±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 ≤ VS ≤ ±5.5V
—
2.5
—
—
—
—
2.5
—
—
—
V/µs
PSRR
Power Supply
Rejection Ratio
110
100
dB
VS
IS
Operating Supply
Voltage Range
Split Supply
Single Supply
±3.3
6.5
—
—
±8.3
16
±3.3
6.5
—
—
±8.3
16
V
V
Quiescent Supply
Current
VS = ±5V
—
0.65
0.85
—
—
1.1
mA
NOTE: 1. Characterized; not 100% tested.
3-270
TELCOM SEMICONDUCTOR, INC.
DUALAUTO-ZEROED
OPERATIONAL AMPLIFIERS
3
TC913A
TC913B
Avoiding Latch-Up
Theory of Operation
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
excessive device power supply current and power dissipa-
tion. The TC913's power supplies should be established at
the same time or before input signals are applied. If this is
not possible, input current should be limited to 0.1mA to
avoid triggering the p-n-p-n structure.
Each of the TC913's two op-amps actually consists of
two amplifiers. A main amplifier is always connected from
the input to the output. A separate nulling amplifier alter-
nately nulls its own offset and then the offset of the amplifier.
Since each amplifier is continuously being nulled, offset
voltage drift with time, temperature, and power supply
variations is greatly reduced.
All nulling circuitry is internal and the nulling operation is
transparent to the user. Offset nulling voltages are stored on
two internal capacitors. An internal oscillator and control
logic, shared by the TC913's two amplifiers, control the
nulling process.
Pin Compatibility
The TC913 pinout is compatible with OP-14, LM358,
MC1458, LT1013, TLC322, and similar dual op amps. In
many circuits operating from single or ±5V supplies, the
TC913 is a drop-in replacement offering DC performance
rivaling that of the best single op amps.
The TC913's amplifiers include a low-impedance class
AB output buffer. Some previous CMOS chopper amplifiers
usedahigh-impedanceoutputstagewhichmadeopen-loop
gain dependent on load resistance. The TC913's open-loop
gain is not dependent on load resistance.
Overload Recovery
The TC913 recovers quickly from output saturation.
Typical recovery time from positive output saturation is
20msec. Negative output saturation recovery time is typi-
cally 5msec.
TELCOM SEMICONDUCTOR, INC.
3-271
DUALAUTO-ZEROED
OPERATIONAL AMPLIFIERS
TC913A
TC913B
TYPICAL CHARACTERISTICS
Input Offset Voltage vs.
Common-Mode Voltage
Supply Current vs. ± Supply Voltage
1200
Gain and Phase vs. Frequency
50
40
30
20
225
180
135
90
35
30
25
20
15
V
= ±5V
= +25°C
= 10 kΩ
T
= +25°C
S
A
V
T
= ±5V
S
T
A
= +25°C
1000
800
600
400
200
0
PHASE
A
R
L
GAIN
10
0
45
0
–10
–45
10
–20
–30
–90
5
0
–135
–180
10M
–40
2
3
4
5
6
7
8
–6 –5 –4 –3 –2 –1
0
1
2
3
4
10k
100k
1M
± SUPPLY VOLTAGE (V)
INPUT COMMON-MODE VOLTAGE (V)
FREQUENCY (Hz)
Output Voltage Swing vs.
Load Resistance
Positive Overload Recovery Time
Negative Overload Recovery Time
T
= +25°C
A
R
T
= 10 kΩ
= +25°C
L
–SWING
+SWING
V
= ±5V
S
OUTPUT =
2 V/DIV
5.0
4.2
A
INPUT
0V
0V
3.4
2.6
1.8
1.0
OUTPUT
= 2 V/DIV
INPUT
INPUT
GAIN = –20
HORIZONTAL SCALE = 20 msec/DIV
GAIN = –20
HORIZONTAL SCALE = 20 msec/DIV
100
1k
10k
100k
1M
LOAD RESISTANCE (Ω)
3-272
TELCOM SEMICONDUCTOR, INC.
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