TC911ACOA713 - Microchip Technology

TC911A

TC911B

TC911/A/B-7 9/11/96

Monolithic Auto-Zeroed Operational Amplifers

FEATURES

■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/µsec

■Wide Bandwidth............................................1.5MHz

■High Open-Loop Voltage Gain

(RL = 10kΩ) ..................................................... 120dB

■Low Input Voltage Noise

(0.1Hz to 1Hz)............................................ 0.65µVP-P

■Pin Compatible With ICL7650

■Lower System Parts Count

GENERAL DESCRIPTION

The TC911 CMOS auto-zeroed operational amplifier

is the first complete monolithic chopper-stabilized ampli-

fier. Chopper operational amplifiers like the ICL7650/7652

and LTC1052 require user-supplied, external offset com-

pensation storage capacitors. External capacitors are

not required with the TC911. Just as easy to use as the

conventional 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.

PIN CONFIGURATION (SOIC and DIP)

–+

–

VDD VSS

TC911

–INPUT

+INPUT

NOTE: Internal capacitors. No external capacitors required.

MAIN

AMPLIFIER

LOW IMPEDANCE

OUTPUT BUFFER

INTERNAL

OSCILLATOR

(f 200 Hz)

OSC ≈

V CORRECTION AMPLIFIER

–

OUTPUT

+ INPUT

TC911ACPA

TC911BCPA

– INPUT

NC = NO INTERNAL CONNECTION

OUTPUT

+ INPUT

TC911ACOA

TC911BCOA

– INPUT

ORDERING INFORMATION

Maximum

Temperature Offset

Part No. Package Range Voltage

TC911ACOA 8-Pin SOIC 0°C to +70°C15µV

TC911ACPA 8-Pin 0°C to +70°C15µV

Plastic DIP

TC911BCOA 8-Pin SOIC 0°C to +70°C30µV

TC911BCPA 8-Pin 0°C to +70°C30µV

Plastic DIP

FUNCTIONAL BLOCK DIAGRAM

TC911A

TC911/B

Monolithic Auto-Zeroed Operational Amplifers

ABSOLUTE MAXIMUM RATINGS*

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

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

Package Power Dissipation (TA ≤ 70°C)

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

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

*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

above those indicated in the operational sections of the specifications is not

implied.

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 0°C ≤ TA ≤ +70°C — 0.05 0.15 — 0.1 0.25 µV/°C

Coefficient of Input –25°C ≤ TA ≤ +85°C — 0.05 0.15 — 0.1 0.25 µV/°C

Offset Voltage (Note 1)

IBAverage Input Bias TA = +25°C — — 70 — — 120 pA

Current 0°C ≤ TA ≤ +70°C——3——4nA

–25°C ≤ TA ≤ +85°C——4 ——6nA

IOS Average Input TA = +25°C — 5 20 — 10 40 pA

Offset Current TA = +85°C——1——1nA

eNInput Voltage Noise 0.1 to 1 Hz, RS ≤ 100Ω— 0.65 — — 0.65 — µVP-P

0.1 to 10 Hz, RS ≤ 100Ω—11— — 11—µVP-P

CMRR Common-Mode VSS ≤ VCM ≤ VDD – 2.2 110 116 — 105 110 — dB

Rejection Ratio

CMVR Common-Mode VSS —V

DD – 2 VSS —V

DD –2 V

Voltage Range

AOL Open-Loop Voltage

= 10 kΩ, V

OUT

= ±4V

115 120 — 110 120 — dB

Gain

VOUT Output Voltage Swing RL = 10 kΩVSS + 0.3 — VDD – 0.9 VSS + 0.3 — VDD – 0.9 V

BW Closed Loop Closed Loop Gain = +1 — 1.5 — — 1.5 — MHz

Bandwidth

SR Slew Rate RL = 10 kΩ, CL = 5 0pF — 2.5 — — 2.5 — V/µsec

PSRR Power Supply ±3.3V to ±5.5V 112 — — 105 — — dB

Rejection Ratio

VSOperating Supply Split Supply ±3.3 — ±8±3.3 — ±8V

Voltage Range Single Supply 6.5 — 16 6.5 — 16 V

ISQuiescent Supply VS = ±5V — 350 600 — — 800 µA

Current

NOTES: 1. Characterized; not 100% tested.

Monolithic Auto-Zeroed Operational Amplifers

TC911A

TC911B

TYPICAL CHARACTERISTICS

450

SUPPLY CURRENT (µA)

–100 AMBIENT TEMPERATURE (°C)

400

350

300

250

200 –50 0 50 100 150

Supply Current vs. Temperature

VS = ±5V

HORIZONTAL SCALE = 2 µs/DIV

Large Signal Output

Switching Waveform

RL = 10 kΩ

TA = +25°C

INPUT VERTICAL

SCALE = 2 V/DIV

OUTPUT

VERTICAL

SCALE

= 1 V/DIV

INPUT OFFSET VOLTAGE (µV)

–6INPUT COMMON-MODE VOLTAGE (V)

Input Offset Voltage vs.

Common-Mode Voltage

0–5–4–3–2–101234

VS = ±5V

TA = +25°C

700

600

500

400

300

200

100

SUPPLY CURRENT (µA)

2345678

± SUPPLY VOLTAGE (V)

TA = +25°C

Supply Current vs. ± Supply Voltage

CLOSED-LOOP GAIN (dB)

10k FREQUENCY (Hz)

Gain and Phase vs. Frequency

–10

–20

–30

–40 100k 1M 10M

PHASE

GAIN

VS = ±5V

TA = +25°C

RL = 10 kΩ

225

PHASE (deg)

180

135

–45

–90

–135

–180

± OUTPUT VOLTAGE (V)

100 LOAD RESISTANCE (Ω)

Output Voltage Swing vs.

Load Resistance

5.0 VS = ±5V

TA = +25°C

–SWING

+SWING

4.2

3.4

2.6

1.8

1.0 1k 10k 100k

5.8

TC911A

TC911/B

Monolithic Auto-Zeroed Operational Amplifers

Pin Compatibility

The CMOS TC911 is pin compatible with the industry

standard ICL7650 chopper-stabilized amplifier. The ICL7650

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.

Thermocouple Errors

Heating one joint of a loop made from two different

metallic wires causes current flow. This is known as the

Seebeck effect. By breaking the loop, an open circuit voltage

Figure 1. Unwanted Thermocouple Errors Eliminated by

Reducing Thermal Gradients and Balancing Junctions

J2J1

PACKAGE

J = J

NO TEMPERATURE DIFFERENTIAL

AND SAME METALLIC CONNECTION

–

+–+–

V2V1

V5V6

J2J1

J5J6

V = 0

V = V + V + V – V – V – V = 0

T123456

(Seebeck voltage) can be measured. Junction tempera-

ture and metal type determine the magnitude. Typical

values are 0.1µV/°C to 10µV/°C. Thermal-induced voltages

can be many times larger than the TC911 offset voltage drift.

Unless unwanted thermocouple potentials can be con-

trolled, system 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.

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

excessive device power supply current and excessive power

dissipation. TC911 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.

Overload Recovery

The TC911 recovers quickly from the output satura-

tion. Typical recovery time from positive output saturation is

20msec. Negative output saturation recovery time is typi-

cally 5msec.

Monolithic Auto-Zeroed Operational Amplifers

TC911A

TC911B

–

TC911

18 kΩ

6.4 kΩ

3.6 kΩ

6.4V

0.1 µF

+15V

V = 10V

OUT

TYPICAL APPLICATIONS

Thermometer Circuit

10-Volt Precision Reference

+9V

TC911

REF02

–

+VOUT

ADJ

TEMP

OUT

VREF

V = V

OUT 1 + R2

[ ( ) VREF

–

][R2]

1 + R2

[R + R1

( )]d (V )d V

OUT =≈K (2.1 mV/°C)

K = 1 + R2

dT R X R

TEMP

3dT

R + R13 R1

R X R

Programmable Gain Amplifier With Input Multiplexer

–

IN1

TC911

IN2

IN3

A1A2A3A4WR

+5V –5V GND +5V –5V

+5V –5V 1

VOUT

2 kΩ

18 kΩ

INPUT

CHANNEL

SELECT

68HC11

GAIN

SELECT A1A2A3A4

WR LATCH GND

10X 100 1000XXX

99 kΩ999 kΩ

1 kΩ1 kΩ

IN4

IC1b

IC1a, b, = Quad Analog Switch

TC911A

TC911/B

Monolithic Auto-Zeroed Operational Amplifers

Dimensions: inches (mm)

3° 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)

PACKAGE DIMENSIONS

.050 (1.27) TYP.

8° 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 (Narrow)

Monolithic Auto-Zeroed Operational Amplifers

TC911A

TC911B

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2001 Microchip Technology Incorporated. Printed in the USA. 1/01 Printed on recycled paper.

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