ST TS271 User Manual

Low Power Single Operational Amplifier

■ Offset null capability (by external compensation)

■ Dynamic characteristics adjustable I

■ Consumption current and dynamic

parameters are stable regarding the voltage power supply variations

■ Output voltage can swing to ground

■ Very large I

■ Stable and low offset voltage

■ Three input offset voltage selections

SET

range

TS271

CMOS Programmable

SET

N

DIP8

(Plastic Package)

Description

The TS271 is a low cost, low power single operational amplifier designed to operate with

(Plastic Micropackage)

D

SO-8

single or dual supplies. This operational amplifier uses the ST silicon gate CMOS process giving it an excellent consumption-speed ratio. This

Pin Connections (top view)

amplifier is ideally suited for low consumption applications.

The power supply is externally programmable with a resistor connected between pins 8 and 4. It allows to choose the best consumption-speed ratio and supply current can be minimized according to the required speed. This device is specified for the following I

current values:

SET

1.5µA, 25µA, 130µA.

This CMOS amplifier offers very high input impedance and extremely low input currents. The major advantage versus JFET devices is the very low input currents drift with temperature see

1

2

3

45

-

+

1 - Offset Null 1 2 - Inverting Input 1 3 - Non-inverting Input 1

-

4 - V

CC

5 - Offset Null 2 6 - Output

+

7 - V

CC

8 - I

Set

8

7

6

Figure 8, Figure 19, Figure 30.

Order Codes

Part Number Temperature Range Package Packaging

TS271CN/ACN TS271CD/CDT/ACD/ACDT SO Tube and Tape & Reel TS271IN/AIN/ TS271ID/IDT/AID/AIDT/BID/BIDT SO Tube and Tape & Reel TS271BMD -55°C, +125°C SO Tube

0°C, +70°C

-40°C, +125°C

DIP Tube

March 2005 Revision 2 1/17

TS271 Block Diagram

1 Block Diagram

Figure 1. Application block diagram

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Absolute Maximum Ratings TS271

2 Absolute Maximum Ratings

Table 1. Key parameters and their absolute maximum ratings

Symbol Parameter TS271C/AC/BC TS271I/AI/BI TS271M/AM/BM Unit

+

VCC

Vid

T

1) All values, except differential voltage are with respect to network ground terminal.

2) Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.

3) The magnitude of the input and the output voltages must never exceed the magnitude of the positive supply voltage.

Supply Voltage

Differential Input Voltage

V

Input Voltage

i

I

Output Current for V

o

I

Input Current

in

Operating Free-Air Temperature Range

oper

Storage Temperature Range

stg

Table 2. Operating conditions

Symbol Parameter Value Unit

+

V

Supply Voltage

CC

Common Mode Input Voltage Range

icm

1

2

3

+

≥ 15V

CC

18 V

±18 V

-0.3 to 18 V

±30 mA

±5 mA

0 to +70 -40 to +125 -55 to +125 °C

-65 to +150 °C

3 to 16 V

0 to V

CC

+

- 1.5

V

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TS271 Absolute Maximum Ratings

Figure 2. Schematic Diagram

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Absolute Maximum Ratings TS271

Figure 3. Offset voltage null circuit

-

5

1

+

8

25kΩ

R

set

OFFSET COMPENSATION GUARANTEED FOR TS271BCX (I > 25 A), TS271ACX (I > 90 A)

SET SETµµ

Figure 4. Offset voltage null circuit

-

5

1

+

8

25kΩ

Figure 5. Resistor biasing

+

V

CC

-

V

CC

+

-

V

CC

CONNECTED TO GROUND

R

set

V

O

R

set

CONNECTED TO

R

set

+

V

CC

-

V

O

+

R

set

-

V

CC

-

VALUE :SEE Fig. 1)

(R

V

set

CC

Figure 6. Rset connected to Vcc-

V = +3VCC

V = +5VCC

Rset

-

V

CC

10MΩ

V = +16VCC

V = +10VCC

R

set

OFFSET COMPENSATION GUARANTEED FOR TS271BCX (I > 25 A), TS271ACX (I > 90 A)

SET SETµµ

1MΩ

100kΩ

10kΩ

0.1 Aµ 1Aµ 10 Aµ 100 Aµ

I

set

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TS271 Electrical Characteristics

3 Electrical Characteristics

Table 3. for I

= 1.5µA - V

SET

CC

+

Symbol Parameter

Input Offset Voltage

V

= 1.4V, Vic = 0V TS271C/I/M

O

V

DV

io

Input Offset Voltage Drift

io

Input Offset Current note

I

io

≤ T

T

min

amb

≤ T

Vic = 5V, VO = 5V

≤ T

T

min

amb

≤ T

max

1

max

Input Bias Current - see note 1

I

ib

Vic = 5V, VO = 5V

≤ T

T

min

amb

≤ T

max

High Level Output Voltage

= 100mV, RL = 1MΩ

V

OH

V

OL

V

id

T

≤ T

amb

≤ T

max

min

Low Level Output Voltage

= -100mV

V

id

Large Signal Voltage Gain

V

A

vd

GBP

CMR

SVR

Gain Bandwidth Product

Common Mode Rejection Ratio

Supply Voltage Rejection Ratio

= 5V, RL = 1MΩ, Vo = 1V to 6V

iC

= 40dB, RL = 1MΩ, CL = 100pF, fin = 100kHz

A

v

V

= 1V to 7.4V, Vo = 1.4V

iC

+

V

= 5V to 10V, Vo = 1.4V

CC

Supply Current (per amplifier)

A

I

sink

SR

CC

I

o

= 1, no load, Vo = 5V

v

≤ T

T

min

amb

≤ T

max

Output Short Circuit Current

V

= 0V, Vid = 100mV

o

Output Sink Current

V

= VCC, Vid = -100mV

o

Slew Rate at Unity Gain

R

= 1MΩ, CL = 100pF, Vi = 3 to 7V

L

Phase Margin at Unity Gain

A

φm

= 40dB, RL = 1MΩ CL = 10pF

v

Overshoot Factor

A

K

OV

e

n

= 40dB, RL = 1MΩ CL = 10pF

v

Equivalent Input Noise Voltage

f = 1kHz, R

= 100Ω

s

= +10V, V

TS271AC/AI/AM TS271BC/BI/BM TS271C/I/M

TS271AC/AI/AM TS271BC/BI/BM

≤ T

T

min

= 100pF

C

L

= 100pF

C

L

CC

-

amb

= 0V, T

≤ T

max

= +25°C (unless otherwise specified)

amb

TS271C/AC/BC

TS271I/AI/BI

TS271M/AM/BM

Min. Typ. Max. Min. Typ. Max.

1.1

0.9

0.25

10

5 2

12

1.1

0.9

0.25

6.5 3

22µV/°C

8.8

8.7

1

100

1

150

98.8

8.6

1

200

1

300

9V

50 50

3020100 3020100 V/mV

0.1 0.1

60 80 60 80

10 15

17

60 60

45 45

0.04 0.04

35 10

40 70

35 10

40 70

30 30

10

5 2

12

6.5

3.5

18

Unit

mV

pA

mV

MHz

dB

µA

mA

V/

µs

Degrees

%

nV

-----------Hz

1) Maximum values including unavoidable inaccuracies of the industrial test.

6/17