TC901 [MICROCHIP]

Dual Auto-Zeroed Operational Amplifiers; 双自动调零运算放大器


型号：	TC901
厂家：	MICROCHIP
描述：	Dual Auto-Zeroed Operational Amplifiers 双自动调零运算放大器运算放大器
文件：	总6页 (文件大小：54K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TC901

Dual Auto-Zeroed Operational Amplifiers

FEATURES

GENERAL DESCRIPTION

■ Second-Generation Monolithic,

Chopper-Stabilized Op Amp

■ No External Capacitors Required

■ Single-Supply Operation ........... ±15V or 5V to 32V

■ Supply Current............................ 450µA at 15V, Typ

■ Input Offset Voltage ................................... 7µV, Typ

■ Common-Mode Rejection Ratio ............140dB, Typ

■ Open-Loop Gain ............ 140dB Into 10k Load, Typ

■ Input Noise ......................... 5µV at 10Hz Bandwidth

■ Pinout Compatible With ICL7650

The TC901 is a monolithic, auto-zeroed operational

amplifier. It is a second-generation design of the TC91X

CMOSchopper-stabilizedop-ampswithon-chipcapacitors.

Elimination of the external capacitors allows the de-

signer to increase reliability, lower cost, and simplify design

by lowering parts count.

Since the TC901 is an auto-zeroing op amp, input offset

voltage is very low. More important, there is almost zero drift

with time. This eliminates production line adjustments, as

well as periodic calibration.

■ Lowest Parts Count Chopper Op Amp

Notable electrical characteristics are low supply cur-

rent (450µA, typical), single-supply operation (5V to 32V),

low input offset voltage (7µV, typical), low noise (<5µV_P-P

PIN CONFIGURATION (DIP and SOIC)

typical, for a 10Hz bandwidth), and fast recovery from

saturation without the use of external clamp circuitry.

This device is supplied in 8-pin plastic DIP and plastic

SOIC packages. It is pin compatible with bipolar, CMOS,

JFET and other chopper-stabilized op-amps using the in-

dustry-standard 741 pinout.

–INPUT

+INPUT

–INPUT

+INPUT

–

OUTPUT

TC901COA

TC901CPA

ORDERING INFORMATION

NC = NO INTERNAL CONNECTION

Temperature

Part No.

Package

Range

TC901COA

TC901CPA

8-Pin SOIC

8-Pin Plastic DIP

0°C to +70°C

FUNCTIONAL BLOCK DIAGRAM

CORRECTION AMPLIFIER

–INPUT

TC901

–

INTERNAL

OSCILLATOR

≈ 200 Hz)

OSC

LOW IMPEDANCE

OUTPUT BUFFER

+INPUT

–

OUTPUT

MAIN

AMPLIFIER

–

NOTE: Internal capacitors. No external capacitors required.

TC901- 7 9/5/96

Dual Auto-Zeroed Operational Amplifiers

TC901

Package Power Dissipation (T_A≤ 70°C)

ABSOLUTE MAXIMUM RATINGS*

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

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

Total Supply Voltage (V_DDto V_SS) ........................... +36V

Input Voltage ........................ (V_DD+ 0.3V) to (V_SS– 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. Appropriate precautions should be taken when

handling, shipping, or storing these devices. Stresses above those listed

under "Absolute Maximum Ratings" may cause permanent damage to the

devices. 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.

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

ELECTRICAL CHARACTERISTICS: V_S±15V, T_A= +25°C, unless otherwise indicated.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

V_OS

Input Offset Voltage

(Figure 2)

T_A= +25°C

—

µV

TCV_OS

Average Temperature

Coefficient of Input

Offset Voltage

0°C ≤ T_A≤ +70°C

(Note 1)

—

0.05

0.15

µV/°C

I_BIAS

Average Input Bias

Current

T_A= +25°C

0°C ≤ T_A≤ +70°C

– 25°C ≤ T_A≤ +85°C

—

0.2

I_OS

Average Input

Offset Current

T_A= +25°C

T_A= +85°C

—

100

e_N

Input Voltage Noise

(Figure 1B)

0.1 to 1Hz, R_S≤ 100Ω

—

1.2

—

µV_P-P

e_N

Input Voltage Noise

(Figure 1A)

0.1 to 10Hz, R_S≤ 100Ω

—

CMRR

CMVR

Common-Mode Rejection

Ratio

_SS≤ V_CM≤ V_DD– 2V

120

V_SS

140

—

Common-Mode Voltage

Range

V_S= ±5V to ±15V

V_DD–2

A_OL

Open-Loop Voltage Gain

Output Voltage Swing

R_L= 10kΩ, V_S= ±15V

R_L= 10kΩ

120

V_SS+ 1

—

140

—

V_DD–1.2

—

V_OUT

Closed-Loop Bandwidth

(Figure 7)

Closed-Loop Gain = +1

0.8

MHz

Slew Rate

R_L= 10 kW, C_L= 50pF

V_S= ±5V to ±15V

Note 2

—

120

±3

—

V/µsec

PSRR

V_S

Power Supply Rejection Ratio

140

—

Operating Supply Voltage

Range

±16

I_S

Quiescent Supply (Figure 2)

V_S= ±15V

—

0.45

0.6

NOTES: 1. Characterized; not 100% tested.

2. Single supply operation: V_DD= +5V to +32V.

TC901- 7 9/5/96

Dual Auto-Zeroed Operational Amplifiers

TC901

Overload Recovery

Avoiding Latch-Up

The TC901 recovers quickly from output saturation.

Typical recovery time from positive output saturation is 20

msec. Negative output saturation recovery time is typically

msec.

Larger voltages can turn the p-n-p-n device on, causing

excessivedevicepowersupplycurrentandexcessivepower

dissipation. TC901's power supply should be established at

the same time (or before) input signals are applied. If this is

not possible, input current should be limited to 100µA to

avoid triggering the p-n-p-n structure.

Thermocouple Errors

Heating a junction made from two different metallic

wires causes current flow. This is known as the Seebeck

effect. An open-circuit voltage (Seebeck voltage) can be

measured across the junction. 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 TC901's 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

thermoelectric coefficient solder can reduce errors. A 60%

Cd/40% Sn Pb solder has one-tenth 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 7).

Pin Compatibility

TheCMOSTC901ispincompatiblewithotherchopper-

stabilized amplifiers, such as the 7650, 7652 and 1052.

Amplifiers such as the 7650 require 0.1µF external capaci-

tors connected to pins 1 and 8. The TC901 includes the

chopper capacitors on-chip, so external capacitors are not

required. Since pins 1, 5 and 8 of the TC901 are not

connected, the TC901 can directly replace other chopper-

stabilized amplifiers in existing circuits.

The TC901 pinout also matches many popular bipolar

and JFET op amps, such as the OP-07, OP-20, LM101,

LM108, 356and741. Inmanyapplicationsthatoperatefrom

±15V power supplies, the TC901 offers superior electrical

performance and is a functional pin-compatible replace-

ment. Offset voltage correction potentiometers, compensa-

tion capacitors, and chopper-stabilization capacitors can be

removed when retrofitting existing equipment designs.

System parts count, assembly time, and system cost are

reduced, while reliability and performance are improved.

Shielding precision analog circuits from air currents —

especially those caused by power dissipating components

and fans — will minimize temperature gradients and mini-

mize thermocouple-induced errors.

Overload Recovery

The TSC90X Series recovers quickly from output

saturation. Typical recovery time from positive output satu-

ration is 20msec. Negative output saturation recovery time

is typically 5msec.

= J

NO TEMPERATURE DIFFERENTIAL

AND SAME METALLIC CONNECTION

PACKAGE

–

= 0

= V + V + V – V – V – V = 0

–

Figure 7. Unwanted Thermocouple Errors Eliminated by Reducing

Thermal Gradients and Balancing Junctions

TC901- 7 9/5/96

Dual Auto-Zeroed Operational Amplifiers

TC901

INPUT

2 V/DIV

OUTPUT

5 V/DIV

–15V

5 msec/DIV

1 sec/DIV

Figure 3. Recovery From Negative Saturation

Figure 1. Input Voltage Noise

(µV)

(µA)

450

400

350

300

OUTPUT

5 V/DIV

250

200

150

100

OUTPUT

5 V/DIV

–2V

20 msec/DIV

±V (V)

12 14 16

18 20

Figure 2. V_OSand I_DDvs Supply Voltage

Figure 4. Recovery From Positive Saturation

+50

+40

+30

+20

+10

R₂

+240

+180

+120

+60

+15V

R₁

–

0°C

OUTPUT

–10

PHASE MARGIN

10kΩ with 50 pF LOAD

36° at 700 kHz at 70°C

40° at 800 kHz at 25°C

–20

–30

–120

–180

–15V

GAIN = 40

R₁= 1kΩ

R₂= 40kΩ

–40

100

10k

100k

FREQUENCY (Hz)

Figure 5. Saturation Test Circuit

Figure 6. Phase-Gain

TC901- 7 9/5/96

Dual Auto-Zeroed Operational Amplifiers

TC901

PACKAGE DIMENSIONS

8-Pin SOIC Narrow

.157 (3.99)

.150 (3.81)

.244 (6.20)

.228 (5.79)

.050 (1.27) TYP.

.197 (5.00)

.189 (4.80)

.069 (1.75)

.053 (1.35)

.010 (0.25)

.007 (0.18)

8° MAX.

.020 (0.51)

.013 (0.33)

.010 (0.25)

.004 (0.10)

.050 (1.27)

.016 (0.40)

8-Pin Plastic Dip

PIN 1

.260 (6.60)

.240 (6.10)

.045 (1.14)

.030 (0.76)

.070 (1.78)

.040 (1.02)

.310 (7.87)

.290 (7.37)

.400 (10.16)

.348 (8.84)

.200 (5.08)

.140 (3.56)

.040 (1.02)

.020 (0.51)

.015 (0.38)

.008 (0.20)

3° MIN.

.150 (3.81)

.115 (2.92)

.400 (10.16)

.310 (7.87)

.110 (2.79)

.090 (2.29)

.022 (0.56)

.015 (0.38)

Dimensions: inches (mm)

TC901- 7 9/5/96

Dual Auto-Zeroed Operational Amplifiers

TC901

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01/09/01

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TC901- 7 9/5/96

TC901 [MICROCHIP]

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