MICROCHIP TC913A, TC913B Technical data

TC913A/TC913B

B

Dual Auto-Zeroed Operational Amplifiers

Features

• FirstMonolithic Dual Auto-Zeroed
Operational Amplifier

• Chopper Amplifier PerformanceWithout External
Capacitors

-V

:15µVMax

OS

: Drift; 0.15µV/°C Max

-V

OS

- Saves Cost of External Capacitors

• SOIC Packages Available

• High DC Gain; 120dB

• Low Supply Current; 650µA

• Low Input VoltageNoise

-0.65µV

(0.1Hz to 10Hz)

P-P

• Wide Common Mode Voltage Range

to VDD-2V

-V

SS

• High Common Mode Rejection; 116dB

• Dual or Single Supply Operation:

-±3.3Vto±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

Applications

• Instrumentation

• Medical Instrumentation

• Embedded Control

• Temperature Sensor Amplifier

• Strain Gage Amplifier

Device Selection Table

Part Number Package

Temp.

Range

TC913ACOA 8-Pin SOIC 0°C t o

+70°C

TC913ACPA 8-Pin PDIP 0°C to

+70°C

TC913BCOA 8-Pin SOIC 0°C t o

+70°C

TC913BCPA 8-Pin PDIP 0°C to

+70°C

Offset

Voltage

15µV

15µV

30µV

30µV

Package Type

PDIP

TC913ACPA
TC913BCPA

-IN A

+IN A

V

SS

1

-

2

3

4

8OUT A

A

+

V

DD

B

OUT B

7

+

-

6

-IN B

+IN B

5

SOIC

TC913ACOA
TC913BCOA

V

8OUT A

DD

B

OUT

7

-

6

-IN B

5

+IN B

-IN A

+IN A

V

1

A

+

-

2

+

3

4

SS

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-supplied,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 con­trasted with a TC7650 chopper amplifier circuit imple­mentation.A single TC913 replaces two TC7650's and
four capacitors. Five components and assembly steps
are eliminated.

The TC913 pinout matches many popular dual-opera­tionalamplifiers: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 r eplacement; 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 Microchip's
proprietary CMOS technology. Unity gain bandwidth is

1.5MHz and slew rate is 2.5V/µsec.



2002 Microchip TechnologyInc. DS21482B-page 1

TC913A/TC913B

Functional Block Diagram

-Input A

-Input B
+Input A
+Input B

V

SS

48

V

DD

TC913

VOS Correction Amplifier

+

A

–

*

B

A

B

*

Low Impedance

2
6
5

3

1 of 2 Amplifier Shown

*NOTE: Internal capacitors. No external capacitors required.

-

+

Main Amplifier

Output Buffer

+

-

Internal

Oscillator

(f

OSC

200Hz)

1

7

Output A

Output B

DS21482B-page 2



2002 Microchip TechnologyInc.

TC913A/TC913B

1.0 ELECTRICAL
CHARACTERISTICS

Absolute Maximum Ratings*

Total Supply Voltage (VDDto VSS) .......................+18V

Input Voltage...................... (V

+0.3V)to (V

DD

SS

-

0.3V)

*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 above those indicated in the
operation sections of the specifications is not implied. Expo­sure to Absolute Maximum R ating conditions for extended
periodsmay affectdevice reliability.

Current Into Any Pin............................................10mA

While Operating..........................................100µA

Package Power Dissipation (T

–70°C)

A

Plastic DIP ................................................730mW

Plastic SOIC .............................................470mW

Operating Temperature Range

C Device .......................................... 0°C to +70°C

StorageTemperature Range..............-65°C to +150°C

TC913A AND TC913B ELECTRICAL SPECIFICATIONS

Electrical Characteristics: VS=±5V,TA= +25°C, unless otherwise indicated.

TC913A TC913B

Symbol Parameter Min Typ Max Min Typ Max Unit Test Conditions

Input Offset

V

OS

Voltage

TCV

Average Temp.

OS

Coefficient of
Input Offset
Voltage

Average Input

I

B

Bias Current

Average Input

I

OS

Offset Current
Input Voltage

e

N

Noise

CMRR Common Mode

Rejection Ratio

CMVR Common Mode

Voltage Range
Open-Loop

A

OL

Voltage Gain

OUT

OutputVoltage
Swing

V

BW Closed Loop

Bandwidth

SR Slew Rate — 2.5 — — 2.5 — V/µsec R

PSRR Power Supply

Rejection Ratio
Operating

V

S

Supply Voltage
Range

I

Quiescent

S

Supply Current

Note 1: Characterized; not 100% tested.

—515—1530µVTA=+25°C

—
—

0.05

0.05

0.15

0.15

—
—

0.1

0.1

0.25

0.25

µV/°C
µV/°C

0°C ≤ T

-25°C ≤ T

≤ +70°C

A

≤ +85°C

A

(Note 1)

T

—
—
—

—
—

—
—

—
—
—

5

—

0.6
11

90

3
4

20

1

—
—

—
—
—

—
—

—
—

—
—
—

10

—

0.6
11

120

4
6

40

1

—
—

110 116 — 100 110 — dB V

V

SS —

2V

DD -

SS —

V

DD -

V

115 120 — 110 120 — dB RL=10kΩ,V

pA
nA
nA

pAnATA=+25°C

µV

P-P

µV

P-P

2V

=+25°C

A

0°C ≤ T

-25°C ≤ T

T

=+85°C

A

≤ +70°C

A

≤ +85°

A

0.1to1Hz,RS≤ 100Ω

0.1to10Hz,R
≤ VCM≤ VDD-2.2

SS

OUT

VSS+0.3 — VDD-0.9 VSS+0.3 — VDD-0.9 V RL=10kΩ

— 1.5 — — 1.5 — MHz ClosedLoopGain=+1

=10kΩ,CL=50pF

L

110 — — 100 — — dB ±3.3V to ±5.5V

±3.3

6.5

—
—

±8.3

16

±3.3

6.5

—
—

±8.3

16

VVSplit Supply

Single Supply

— 0.65 0.85 — — 1.1 mA VS=±5V

S

≤ 100Ω

=±4V



2002 Microchip TechnologyInc. DS21482B-page 3

TC913A/TC913B

2.0 PIN DESCRIPTIONS

ThedescriptionsofthepinsarelistedinTable2-1.

TABLE 2-1: PIN FUNCTION TABLE

Pin No.
(8-Pin PDIP)
(8-Pin SOIC)

1 OUT A Output
2 -IN A InvertingInput
3 +IN A Non-inverting Input
4V
5 +IN B Non-inverting Input
6 -IN B InvertingInput
7 OUT B Output
8V

Symbol Description

SS

DD

Negative Power Supply

Positive Power Supply

DS21482B-page 4



2002 Microchip TechnologyInc.

TC913A/TC913B

3.0 DETAILED DESCRIPTION

3.1 Theory of Operation

Each of the TC913's two Op Amps actually consists of
two amplifiers. A main amplifier is always connected
fromthe inputto the output. A separatenullingamplifier
alternatelynullsits own offset andthen the offsetof the
amplifier. Since each am plifier is continuously being
nulled, offset voltage drift wi th 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 controllogic,sharedby theTC913'stwoamplifiers,
control the nulling process.

3.2 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 used a high impedance output stage which
made open-loop gain dependent on load resistance.
The TC913's open-loop gain is not dependent on load
resistance.

3.3 Overload Recovery

The TC913 recovers quickly from output saturation.
Typicalrecovery time from positive output saturation is
20 msec. Negative output saturation recovery time is
typically 5 msec.

3.4 Avoiding La tchup

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. Lar ger voltages can turn the p-n-p-n
device on, causing excessive device power supply
current and power dissipation. 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.



2002 Microchip TechnologyInc. DS21482B-page 5

TC913A/TC913B

(

g)

4.0 TYPICAL CHARACTERISTICS

Note: The graphs and tables provided following this note are a statistical summary based on a limited number of

samplesandareprovidedforinformational purposesonly. The performance characteristics listed hereinare
not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range ( e.g., outside specified power supply range) and therefore outside t he warranted range.

Supply Current vs. ± Supply Voltage

1200

TA = +25˚C

1000

800

600

400

SUPPLY CURRENT (µA)

200

0

23 54678

± SUPPLY VOLTAGE (V)

Output Voltage Swing vs.

Load Resistance

T

= +25˚C

A

VS = ±5V

5.0

4.2

3.4

2.6

± OUTPUT VOLTAGE (V)

1.8

1.0
100

1k 10k 100k

LOAD RESISTANCE (Ω)

-SWING

+SWING

Input Offset Voltage vs.

Common Mode Voltage

35

VA = ±5V

30

= +25˚C

T

A

25

20

15

10

INPUT OFFSET VOLTAGE (µV)

5

0

-6

-5 -4 -3 -2 -1 0 1 2 3 4

INPUT COMMON MODE VOLTAGE (V)

Negative Overload Recovery Time

RL = 10 k

= +25˚C

T

A

Gain = –20

1M

HORIZONTAL SCALE = 20 msec/DIV

Ω

INPUT

OUTPUT
= 2 V/DIV

Gain and Phase vs. Frequency

50

40

30

20

10

0

-10

-20

CLOSED-LOOP GAIN (dB)

-30

-40
10k

PHASE

GAIN

100k 1M 10M

FREQUENCY (Hz)

VS = ±5V

= +25˚C

T

A

R

= 10 k

L

225

180

Ω

135

90

45

de

0

PHASE

-45

-90

-135

-180

Positive Overload Recovery Time

OUTPUT =
2 V/DIV

0V

INPUT INPUT

GAIN = –20

HORIZONTAL SCALE = 20 msec/DIV

0V

DS21482B-page 6



2002 Microchip TechnologyInc.

5.0 PACKAGING INFORMATION

5.1 Package Marking Information

Package marking data not available at this time.

5.2 Taping Form

Component Taping Orientation for 8-Pin SOIC (Narrow) Devices

User Direction of Feed

PIN 1

TC913A/TC913B

W

P

Standard Reel Component Orientation
for TR Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

8-Pin SOIC (N) 12 mm 8 mm 2500 13 in



2002 Microchip TechnologyInc. DS21482B-page 7

TC913A/TC913B

.

8

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

8

C

3

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

8-Pi

P

5.3 Package Dimensions

-Pin SOI

.050 (1.27) TYP

.197 (5.00
.189 (4.80

.020 (0.51
.013 (0.33

n Plastic DI

.157 (3.99
.150 (3.81

.010 (0.25
.004 (0.10

.244 (6.20
.228 (5.79

.069 (1.75
.053 (1.35

.010 (0.25
.007 (0.18

.050 (1.27
.016 (0.40

Dimensions: inches (mm)

.045 (1.14
.030 (0.76

.200 (5.08
.140 (3.56

.150 (3.81
.115 (2.92

.400 (10.16

.348 (8.84

.110 (2.79
.090 (2.29

.070 (1.78
.040 (1.02

.022 (0.56
.015 (0.38

.260 (6.60
.240 (6.10

.040 (1.02
.020 (0.51

.310 (7.87
.290 (7.37

.015 (0.38
.008 (0.20

.400 (10.16

.310 (7.87

Dimensions: inches (mm)

DS21482B-page 8



2002 Microchip TechnologyInc.

TC913A/TC913B

SALES AND SUPPORT

Data Sheets

Products supportedby a preliminaryData Sheet may have an errata sheet describing minor operational differences and recom­mendedworkarounds.To determine if an errata sheet exists for a particulardevice, please contactone of the following:

1. Your local Microchip sales office

2. The Microchip CorporateLiterature Center U.S. FAX: [phone]

3. The Microchip Worldwide Site (www.microchip.com)
Pleasespecify which device, revision of silicon and Data Sheet (includeLiterature #) you are using.

New Customer Notification System

Register on our web site (www.microchip.com/cn) to receive the mostcurrenti nformationon our products.



2002 Microchip TechnologyInc. DS21482B-page 9

TC913A/TC913B

NOTES:

DS21482B-page 10



2002 Microchip TechnologyInc.

TC913A/TC913B

Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information,or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com­ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con­veyed, implicitly or otherwise, under any intellectual property
rights.

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© 2002, Microchip Technology Incorporated, Printed in the
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

2002 Microchip TechnologyInc. DS21482B-page 11

8-bit MCUs, KEELOQ®code hopping

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04/20/02

DS21482B-page 12

*DS21482B*



2002 Microchip Technology Inc.