TC911A - Microchip Technology - Datasheet.Directory

TC911A/TC911B

Features

• First Monolithic Chopper-Stabilized Amplifier with

On-Chip Nu ll ing Cap aci tors

• Low Offset Voltage: 5μV

• Low 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: 120dB

• Low Input Noise Voltage: 0.65μVP-P

(0.1Hz to 1Hz)

• Pin Compatible With ICL7650

• Lower System Parts Count

Applications

• Instrumentation

• Portable/Battery Powered

• Embedded Control

• Temperature Sensor Amplifier

• Strain Gage Amplifier

Package Type

Device Selection Table

Part

Number Package Temperature

Range Offset

Voltage

TC911ACOA 8-Pin SOIC 0°C to +70°C 15μV

TC911ACPA 8-Pin PDIP 0°C to +70°C 15μV

TC911BCOA 8-Pin SOIC 0°C to +70°C 30μV

TC911BCPA 8-Pin PDIP 0°C to +70°C 30μV

Outpu

+ Input

TC911ACPA

TC911BCPA

- Input

VSS

VDD

NC = No Internal Connection

Outpu

+ Input

TC911ACOA

TC911BCOA

- Input

8-Pin SOIC

8-Pin PDIP

Monolith ic Auto-Zeroed Oper ation a l Ampl ifiers

Obsolete Device

TC911A/TC911B

General Descript ion

The TC9 11 CMOS auto-ze roed ope rati ona l a mp lifi er i s

the first complete monolithic chopper stabilized ampli-

fier. Chopper operational amplifiers like the ICL7650/

7652 and LTC1052 require user supplied, external off-

set compensation storage capacitors. External capac-

itors are not required with the TC911. Just a s ea sy

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 reli-

ability, reduced PC board layout effort and greater

board are a util ization. Sp ace sa vings c an be s ignifica nt

in multiple amplifier designs.

Electrical specifications include 15μV maximum offset

voltage and 0.15μV/°C maximum offset voltage tem-

perature co-efficient. Offset voltage error is five times

lower than the premium OP07E bipolar device. The

TC911 improves offset 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 suppl y operation is possible, making single 9V ba t-

tery operation possible. The TC911 is available in 2

package types: 8-pin plastic DIP and SOIC.

Functional Block Diagram

–

VDD VSS

TC911A

TC911B

-Input

+Input

Main Amplifier

Low Impedance

Output Buffer

Internal Oscillator

(FOSC 200HZ)

VOS

Correction Amplifier

–

Outpu

Note: Internal capacitors. No external capacitors required.

TC911A/TC911B

1.0 ELECTRICAL

CHARACTERISTICS

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

Package Power Dissipation (TA - 70°C)

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

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

Operati ng Tempe r atu re Range

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

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

*Stresses above those listed under "Absolute Maxi-

mum Ratings" may cause permanent damage to the

device. These are stress ratings only and functional

operatio n of the devic e at these or an y other con ditions

above those indicated in the operation sections of the

specifications is not implied. Exposure to Absolute

Maximum Rating conditions for extended periods may

affect device reliability.

TC911A AND TC911B ELECTRICAL SPECIFICATIONS

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

TC911A TC911B

Symbol Param e ter Min Typ Max Min Typ Max Unit Test Conditio ns

VOS Input Offset

Voltage — 5 15 — 15 30 μVT

A = +25°C

TCVOS Average Temp.

Coefficient of

Input Offset

Voltage

—

—0.05

0.05 0.15

0.15 —

— 0.1

0.1 0.25

0.25 μV/°C

μV/°C 0°C ≤ TA ≤ +70°C

-25°C ≤ TA ≤ +85°C

(Note 1)

IBAverage Input

Bias Current —

—

120

TA = +25°C

0°C ≤ TA ≤ +70°C

-25°C ≤ TA ≤ +85°

IOS Average Input

Offset Current —

—5

—20

1—

— 10

—40

1pA

nA TA = +25°C

TA = +85°C

eNInput Voltage

Noise —

—0.65

11 —

——

— 0.65

11 —

—μVP-P

μVP-P

0.1 to 1Hz, RS ≤ 100Ω

0.1 to 10Hz, RS ≤ 100Ω

CMRR Common Mode

Rejection Ratio 110 116 — 105 110 — dB VSS ≤ VCM ≤ VDD - 2.2

CMVR Common Mode

Voltage Range VSS —V

DD – 2 VSS — V

DD – 2 V

AOL Open-Loop

Voltage Gain 115 120 — 110 120 — dB RL = 10kΩ, VOUT = ± 4V

VOUT Output Voltage

Swing VSS + 0.3 — VDD – 0.9 VSS + 0.3 — VDD – 0.9 V RL = 10kΩ

BW Closed Loop

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

SR Slew Rate — 2.5 — — 2.5 — V/μsec RL = 10kΩ, CL = 50pF

PSRR Po wer Supply

Rejection Ratio 112 — — 105 — — dB ±3.3V to ±5.5V

VSOperating

Supply Voltage

Range

±3.3

6.5 —

—±8

16 ±3.3

6.5 —

— ±8

16 V

VSplit Supply

Single Supply

ISQuiescent

Supply Current — 350 600 — — 800 μAV

S = ± 5V

Note 1: Characterized; not 100% tested.

TC911A/TC911B

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in <Blue

References>Table 2-1.

TABLE 2-1: PIN FUNCTION TABLE

3.0 DETAILED DESCRIPTION

3.1 Pin Compatibility

The CMOS TC911 is pin compatible with the industry

standard ICL7650 chopper stabilized amplifier. The

ICL7650 must use external 0.1μF capacitors con-

nected at pins 1 and 8. With the TC911, external off-

set voltage error canceling capacitors are not

required. On the TC911 pins 1, 8 and 5 are not con-

nected 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 circuit s conne cted 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, assem-

bly time and total system cost are reduced. Reliability

is increased and PC board layout eased by having the

error storage cap ac ito rs int egra t ed 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 capacitors, and chopper stabilization

capacitors can be removed when retro-fitting existing

equipm ent des ig ns .

3.2 Thermocouple Errors

Heating one joint of a loop made from two different

meta llic wires ca uses current flow. This is kn own as the

Seebeck effect. By breaking the loop, an open circuit

voltage (Seebeck voltage) can be measured. Junction

temperature 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 thermo-

couple potentials can be controlled, system perfor-

mance will be less tha n optim um .

Unwanted thermocouple junctions are created when

leads are soldered or sockets/connectors are used.

Low thermo-electric coefficient solder can reduce

erro rs. A 60% Sn/3 6% P b sol der has 1/10 t he t herm al

volt age of co mmon 64% Sn/ 36% Pb solder at a copp er

junction.

The number and type of dissimilar metallic junctions in

the input circuit loop should be balanced. If the junc-

tions are kept at the same temperature, their summa-

tion will add to zero-canceling errors (Figure 3-1).

Shielding precision analog circuits from air currents -

especially those caused by power dissipating compo-

nents and fans - will minimize temperature gradients

and thermocouple induced errors.

FIGURE 3-1: UNWANTED THERMOCOUPLE ERRORS ELIMINATED BY REDUCING

THERMAL GRADIENTS AND BALANCING JUNCTIONS

Pin Number Symbol Description

1, 5, 8 NC No Internal Connection.

2 -INPUT Inverting Input

3 +INPUT Non-inverting Input

SS Negative Power Supply

6 OUTPUT Output

DD Positive Power Supply

Package

= J

No Temperature Differential and same

Metallic Connection

–

+–+–

= 0

= V

+ V

– V

= 0

TC911A/TC911B

3.3 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

devi ce on, cau sing exc essive dev ice powe r supply c ur-

rent 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 trig-

gering the p-n-p-n structure.

3.4 Overload Recovery

The TC911 recovers quickly from the output saturatio n.

Typical recovery ti me from pos it ive output saturat ion is

20msec. Negative output saturation recovery time is

typically 5msec.

TC911A/TC911B

4.0 TYPICAL APPLICATIONS

FIGURE 4-1: THERMOMETER CIRCUIT FIGURE 4-2: 10-VOLT PRECISION

REFERENCE

FIGURE 4-3: PROGRAMMABLE GAIN AMPLIFIER WITH INPUT MULTIPLEXER

+9V

TC911

REF02

–

VOUT

ADJ

Temp

Out

VREF

VOUT = VTEMP 1 + R2

[()

VREF

–

][

]

1 + R2

[

R3 + R1

()]

d (VTEMP)d VOUT ≈ K (2.1 mV/C)

K = 1 +

dT R3 X R1 dT

R3 + R1

R3 X R1

≈

–

TC911

18 k

6.4 k

3.6 k

6.4V

0.1µF

+15V

OUT

= 10

–

TC911

A1A2A3A4WR

+5V –5V GND +5V –5V

+5V -5V 1

VOUT

18k

Input

Channel

Select

68HC11

Gain

Select

A1A2A3A4

WR Latch GND

10X 100 1000XXX

99k 999k

1k 1k

IN1

IN2

IN3

IN4

IC1b

IC1a, b, = Quad Analog Switch

TC911A/TC911B

5.0 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 p erformance characteristics listed herein ar e

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.

450

Supply Current (µA)

-100

Ambient Temperature (˚C)

400

350

300

250

200

-50 0 50 100 150

Supply Current vs. Temperature

VS = ±5V

Input Offset Voltage (µV)

-6

Input 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

± Su

Volta

(

)

TA = +25˚C

Supply Current vs. ± Supply Voltage

Horizontal Scale = 2µs/DIV

Large Signal Output

Switching Waveform

RL = 10k

TA = +25˚C

Input Vertical Scale = 2 V/DIV

Output

Vertical

Scale

= 1 V/DIV

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 = 10kΩ

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 1M

5.8

TC911A/TC911B

6.0 PACKAGING INFORMATION

6.1 Package Marking Information

Package marking data not available at this time.

6.2 Taping Form

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

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

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

Carrier Tape, Number of Components Per Reel and Reel Size

Standard Reel Component Orientation

for TR Suffix Device

PIN 1

User Direction of Feed

TC911A/TC911B

6.3 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

)

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)

8-Pin Plastic DIP

Dimensions: inches

(

)

TC911A/TC911B

NOTES:

TC911A/911B

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TC911A/911B

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