ST TS271C User Manual

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.

OFFSET NULL CAPABILITY (by external
compensation)

.

DYNAMIC CHARACTERISTICS
ADJUSTABLEBY I

.

CONSUMPTION CURRENT AND DYNAMIC
PARAMETERS ARE STABLE REGARDING
THE VOLTAGEPOWER SUPPLY
VARIATIONS

.

OUTPUT VOLTAGE CAN SWING TO
GROUND

.

VERYLARGE I

.

STABLEAND LOW OFFSETVOLTAGE

.

THREE INPUT OFFSETVOLTAGE
SELECTIONS

SET

SET

RANGE

TS271C,I,M

PROGRAMMABLE CMOS

SINGLE OPERATIONAL AMPLIFIERS

N

DIP8

(Plastic Package)

(Plastic Micropackage)

D

SO8

DESCRIPTION

The TS271is a low cost, lowpowersingle opera­tional amplifierdesigned to operate with single or

dual supplies. This operational amplifier uses the
SGS-THOMSONsilicon gate CMOS process giv­ing it an excellent consumption-speedratio. This
amplifier is ideallysuited for low consumption
applications.

The powersupply is externallyprogrammablewith
a resistorconnectedbetweenpins8and4.Itallows
to choose the best consumption-speedratio and
supply current can be minimizedaccording to the
required speed. This device is specified for the
followingI

This CMOS amplifieroffers very high input imped­ance and extremelylow input currents.The major
advantage versus JFET devices is the very low
input currents drift withtemperature(see figure 3).

currentvalues: 1.5µA, 25µA,130µA.

SET

ORDER CODES

Part Number

TS271C/AC/BC 0
TS271I/AI/BI -40oC, +125oC ●●
TS271M/AM/BM -55oC, +125oC ●●

Example : TS271ACN

PIN CONNECTIONS (top view)

1

2

3

45

Temperature

Range

o

C, +70oC ●●

-

+

1 - Offset Null 1
2 - InvertingInput
3 - Non-invertingInput

-

4-V

CC

5 - Offset Null 2
6 - Output
7-V

+

CC

8-I

SET

Package

ND

8

7

6

October 1997

1/15

TS271C,I,M

BLOCK DIAGRAM

Iset Input Input

Input

differential

Offset null

E E

Second

stage

Output

stage

V

CC

Output

V

CC

MAXIMUMRATINGS

Symbol Parameter Value Unit

+

V

T

T

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

Supply Voltage - (note 1) 18 V

CC

Differential Input Voltage- (note 2) ±18 V

V

id

Input Voltage - (note 3) -0.3 to 18 V

V

i

Output Current for V

I

O

Input Current ±5mA

I

in

Operating Free-Air TemperatureRange

oper

Storage TemperatureRange -65 to +150

stg

2. Differential voltages are thenon-inverting input terminal with respect to the invertinginput terminal.

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

+

≥ 15V ±30 mA

CC

TS271C/AC/BC
TS271I/AI/BI
TS271M/AM/BM

0to+70

-40 to +125

-55 to +125

OPERATINGCONDITIONS

Symbol Parameter Value Unit

+

V

V

Supply Voltage 3 to 16 V

CC

Common Mode Input Voltage Range 0 to V

icm

CC

+

- 1.5 V

o

C

o

C

2/15

SCHEMATIC DIAGRAM

TS271C,I,M

T10

T6T5

T15

T8

R1

T12

T11

Output

C2

C1

T7

T16

T14

T13

T9

CC

V

T2 Input +

CC

V

Offset Null 2

T1

T3 T4

T27

T28

T26

Input -

Set Current

T29

Offset Null 1

3/15

TS271C,I,M

OFFSET VOLTAGENULL CIRCUIT

5

1

8

Ω

25k

R

set

OFFSETCOMPENSATION GUARANTEED FOR
TS271BCX (I

Figure 1 : R

>25µA),TS271ACX (I

SET

Connectedto V

SET

R

set

CC

SET

-

.

V

CC

>90µA)

V

CC

V

CC

= +3V
= +5V

RESISTOR BIASING

V

CC

R

set

V

CC

R

CONNECTED TO

SET

GROUND

V

= +10V

CC

= +16V

V

CC

V

CC

V

O

V

CC

CONNECTED TO

R

SET

-

(R

V

CC

Fig.1)

VALUE : SEE

SET

V

O

R

set

10M Ω

1M Ω

100k Ω

10k Ω

0.1µA

1

µA 10µA 100µA

I

set

4/15

TS271C,I,M

ELECTRICAL CHARACTERISTICS FOR I

+

V

= +10V,V

CC

Symbol Parameter

CC

-

=0V, T

=25oC (unless otherwisespecified)

amb

SET

= 1.5µA

TS271C/AC/BC

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

V

Input Offset Voltage

io

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

V

O

TS271AC/AI/AM
TS271BC/BI/BM

≤ T

T

min.

amb

≤ T

TS271C/I/M

max.

TS271AC/AI/AM

1.1

0.9

0.25

TS271BC/BI/BM

DV

V

V

A

GBP Gain Bandwidth Product (A

Input Offset VoltageDrift 0.7 0.7 µV/oC

io

Input Offset Current - (note 1)

I

io

I

ib

OH

OL

vd

=5V,Vo=5V

V

ic

. ≤ T

T

min

amb

≤ T

max

.

Input Bias Current - (note 1)

=5V,Vo=5V

V

ic

. ≤ T

T

min

amb

≤ T

max

.

High Level Output Voltage

= 100mV,RL=1MΩ

V

id

. ≤ T

T

min

amb

≤ T

max

.

8.8

8.7
Low Level Output Voltage (Vid= -100mV) 50 50 mV
Large Signal VoltageGain

=1Vto6V,RL=1MΩ,Vic=5V

V

o

. ≤ T

T

min

=1MΩ,CL= 100pF,fin= 10kHz) 0.1 0.1

R

L

amb

≤ T

max

.

= 40dB,

v

30
20

1

1

9 8.8

100 30

CMR Common Mode Rejection Ratio

V

= 1.4V,Vic= 1V to 7.4V 60 80 60 80

o

SVR Supply Voltage Rejection Ratio

I

CC

I

o

I

sink

+

V

= 5V to 10V ,Vo= 1.4V 60 80 60 80

CC

Supply Current

= 1, no load, Vo=5V

A

v

T

min

. ≤ T

amb

≤ T

max.

10 15

Output Short Circuit Current

= 100mV, Vo=0V 60 60

V

id

Output Sink Current

= -100mV, Vo=V

V

id

CC

45 45

SR Slew-Rate at Unity Gain

R

=1MΩ,CL= 100pF, Vi= 3 to7V 0.04 0.04

L

∅m Phase Margin at Unity Gain

A

= 40dB, RL=1MΩ

v

K

Note : 1. Maximum values including unavoidable inaccuracies of theindustrial test.

Overshoot Factor

ov

Equivalent Input Noise Voltage

e

n

f = 1kHz, R

= 100Ω 68 68

S

= 10pF

C

L

= 100pF

C

L

= 10pF

C

L

= 100pF

C

L

35
10

40
70

10

5
2

12

6.5
3

100

150

17

TS271I/AI/BI

TS271M/AM/BM

1.1

0.9

0.25

1

1

9

8.6

100

20

10 15

35
10

40
70

Unit

mV

10

5
2

12

6.5

3.5

pA

200

pA

300

V

V/mV

MHz

dB

dB

µA

18

mA

mA

V/µs

Degrees

%

nV

√Hz

5/15