21482b.book

2002 Microchip Technology Inc.

DS21482B-page 1

TC913A/TC913B

Features

• First Monolithic Dual Auto-Zeroed

Operational Amplifier

• Chopper Amplifier Performance Without External

Capacitors

- V

: 15

V Max

- V

: Drift; 0.15

V/°C Max

- Saves Cost of External Capacitors

• SOIC Packages Available

• High DC Gain; 120dB

• Low Supply Current; 650

• Low Input Voltage Noise

- 0.65

P-P

(0.1Hz to 10Hz)

• Wide Common Mode Voltage Range

- V

to V

- 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/

sec

- 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

Package Type

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 amplifi-

ers offer low offset voltage errors by periodically sam-

pling offset error, and storing correction voltages on

capacitors. Previous single amplifier designs required

two user-supplied, external 0.1

F error storage correc-

tion capacitors — much too large for on-chip integra-

tion. 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 imple-

mentation. A single TC913 replaces two TC7650's and

four capacitors. Five components and assembly steps

are eliminated.

The TC913 pinout matches many popular dual-opera-

tional 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.

The TC913 takes full advantage of Microchip's

proprietary CMOS technology. Unity gain bandwidth is

1.5MHz and slew rate is 2.5V/

sec.

Part Number

Package

Temp.

Range

Offset

Voltage

TC913ACOA

8-Pin SOIC

0°C to

+70°C

TC913ACPA

8-Pin PDIP

0°C to

+70°C

TC913BCOA

8-Pin SOIC

0°C to

+70°C

TC913BCPA

8-Pin PDIP

0°C to

+70°C

-IN B

OUT A

-IN A

+IN A

+IN B

PDIP

SOIC

TC913ACPA

TC913BCPA

TC913ACOA

TC913BCOA

OUT B

-IN B

OUT A

-IN A

+IN A

+IN B

OUT B

Dual Auto-Zeroed Operational Amplifiers

2002 Microchip Technology Inc.

DS21482B-page 3

TC913A/TC913B

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Total Supply Voltage (V

to V

) .......................+18V

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

+0.3V) to (V

0.3V)

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

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

Package Power Dissipation (T

– 70°C)

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

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

Operating Temperature Range

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

Storage Temperature Range .............. -65°C to +150°C

*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. Expo-

sure to Absolute Maximum Rating conditions for extended

periods may affect device reliability.

TC913A AND TC913B ELECTRICAL SPECIFICATIONS

Electrical Characteristics: V

= ±5V, T

= +25°C, unless otherwise indicated.

TC913A

TC913B

Symbol

Parameter

Min

Typ

Max

Min

Typ

Max

Unit

Test Conditions

Input Offset

Voltage

—

= +25°C

TCV

Average Temp.

Coefficient of

Input Offset

Voltage

—

0.05

0.15

—

0.1

0.25

V/°C

0°C

≤

+70°C

-25°C

≤

+85°C

(Note 1)

Average Input

Bias Current

—

120

= +25°C

0°C

≤

+70°C

-25°C

≤

+85°

Average Input

Offset Current

—

= +25°C

= +85°C

Input Voltage

Noise

—

0.6

—

0.6

—

P-P

0.1 to 1 Hz, R

≤

100

Ω

0.1 to 10 Hz, R

≤

100

Ω

CMRR

Common Mode

Rejection Ratio

110

116

—

100

110

—

≤

- 2.2

CMVR

Common Mode

Voltage Range

—

DD -

—

DD -

Open-Loop

Voltage Gain

115

120

—

110

120

—

= 10 k

Ω

, V

OUT

= ±4V

OUT

Output Voltage

Swing

+ 0.3

—

- 0.9

+ 0.3

—

-0.9

= 10 k

Ω

Closed Loop

Bandwidth

—

1.5

—

1.5

—

MHz

Closed Loop Gain = +1

Slew Rate

—

2.5

—

2.5

—

sec R

= 10 k

Ω

, C

= 50 pF

PSRR

Power Supply

Rejection Ratio

110

—

100

—

±3.3V to ±5.5V

Operating

Supply Voltage

Range

±3.3

6.5

—

±8.3

±3.3

6.5

—

±8.3

Split Supply

Single Supply

Quiescent

Supply Current

—

0.65

0.85

—

1.1

= ±5V

Note

Characterized; not 100% tested.

2002 Microchip Technology Inc.

DS21482B-page 5

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

from the input to the output. A separate nulling amplifier

alternately 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.

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.

Typical recovery time from positive output saturation is

20 msec. Negative output saturation recovery time is

typically 5 msec.

3.4

Avoiding Latchup

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 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.

TC913A/TC913B

DS21482B-page 6

2002 Microchip Technology Inc.

4.0

TYPICAL CHARACTERISTICS

Note:

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

samples and are provided for informational purposes only. The performance characteristics listed herein are

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 the warranted range.

HORIZONTAL SCALE = 20 msec/DIV

Positive Overload Recovery Time

OUTPUT =

2 V/DIV

INPUT

GAIN = –20

INPUT OFFSET VOLTAGE (µV)

-6

INPUT COMMON MODE VOLTAGE (V)

Input Offset Voltage vs.

Common Mode Voltage

-5

-4

-3

-2

-1

= ±5V

= +25˚C

SUPPLY CURRENT (µA)

± SUPPLY VOLTAGE (V)

Supply Current vs. ± Supply Voltage

HORIZONTAL SCALE = 20 msec/DIV

Negative Overload Recovery Time

= 10 k

= +25˚C

Ω

INPUT

OUTPUT

= 2 V/DIV

CLOSED-LOOP GAIN (dB)

10k

FREQUENCY (Hz)

Gain and Phase vs. Frequency

-10

-20

-30

-40

100k

10M

PHASE

GAIN

= ±5V

= +25˚C

= 10 k

Ω

225

PHASE

(de

180

135

-45

-90

-135

-180

± OUTPUT VOLTAGE (V)

100

LOAD RESISTANCE (

Ω)

Output Voltage Swing vs.

Load Resistance

5.0

= ±5V

= +25˚C

-SWING

+SWING

4.2

3.4

2.6

1.8

1.0

10k

100k

1200

1000

800

600

400

200

= +25˚C

Gain = –20

TC913A/TC913B

DS21482B-page 8

2002 Microchip Technology Inc.

5.3

Package Dimensions

.050 (1.27) TYP.

MAX.

PIN 1

.244 (6.20)

.228 (5.79)

.157 (3.99)

.150 (3.81)

.197 (5.00)

.189 (4.80)

.020 (0.51)

.013 (0.33)

.010 (0.25)

.004 (0.10)

.069 (1.75)

.053 (1.35)

.010 (0.25)

.007 (0.18)

.050 (1.27)

.016 (0.40)

8-Pin SOIC

Dimensions: inches (mm)

° MIN.

PIN 1

.260 (6.60)

.240 (6.10)

.045 (1.14)

.030 (0.76)

.070 (1.78)

.040 (1.02)

.400 (10.16)

.348 (8.84)

.200 (5.08)

.140 (3.56)

.150 (3.81)

.115 (2.92)

.110 (2.79)

.090 (2.29)

.022 (0.56)

.015 (0.38)

.040 (1.02)

.020 (0.51)

.015 (0.38)

.008 (0.20)

.310 (7.87)

.290 (7.37)

.400 (10.16)

.310 (7.87)

8-Pin Plastic DIP

Dimensions: inches (mm)

2002 Microchip Technology Inc.

DS21482B-page 9

TC913A/TC913B

SALES AND SUPPORT

Data Sheets

Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-

mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:

Your local Microchip sales office

The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277

The Microchip Worldwide Site (www.microchip.com)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

New Customer Notification System

2002 Microchip Technology Inc.

DS21482B-page 11

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 com-

ponents in life support systems is not authorized except with

express written approval by Microchip. No licenses are con-

veyed, implicitly or otherwise, under any intellectual property

rights.

Trademarks

The Microchip name and logo, the Microchip logo, FilterLab,

, microID,

MPLAB, PIC, PICmicro, PICMASTER,

PICSTART, PRO MATE, SEEVAL and The Embedded Control

Solutions Company are registered trademarks of Microchip Tech-

nology Incorporated in the U.S.A. and other countries.

dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,

In-Circuit Serial Programming, ICSP, ICEPIC, microPort,

Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,

MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode

and Total Endurance are trademarks of Microchip Technology

Incorporated in the U.S.A.

Serialized Quick Turn Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999

and Mountain View, California in March 2002.

The Company’s quality system processes and

procedures are QS-9000 compliant for its

PICmicro

8-bit MCUs, K

code hopping

devices, Serial EEPROMs, microperipherals,

non-volatile memory and analog products. In

addition, Microchip’s quality system for the

design and manufacture of development

systems is ISO 9001 certified.

DS21482B-page 12

2002 Microchip Technology Inc.

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