Datasheet LS204I, LS204C Datasheet (SGS Thomson Microelectronics)

.

LOW POWERCONSUMPTION

.

SHORT CIRCUIT PROTECTION

.

LOW DISTORTION,LOW NOISE

.

HIGHGAIN-BANDWIDTH PRODUCT

.

HIGHCHANNEL SEPARATION

LS204

HIGH PERFORMANCE

DUALOPERATIONAL AMPLIFIERS

DESCRIPTION

The LS204is a highperformance dual operational
amplifier with frequency and phase compensation
builtintothechip.Theinternalphasecompensation
allows stable operation as voltagefollowerin spite
of itshigh Gain-BandwidthProduct.

The circuit presents very stable electrical charac­teristics over the entire supply voltage range, and
is particularlyintendedforprofessionalandtelecom
applications(activefilter, etc).

PINCONNECTIONS (top view)

Output 1

1

N

DIP8

(Plastic Package)

ORDER CODES

Part Number Temperature Range

LS204C 0, +70
LS204I -40, +105

8

V

CC

(Plastic Micropackage)

o

C ••

o

+

D

SO8

Package
ND

C ••

April 1998

Inverting Input 1

Non-inverting Input 1

CCV

Output

2

3

-

4

-

+

-

+

7

Non-inverting Input 2

6

Inverting Input 2

5

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LS204

SCHEMATIC DIAGRAM (1/2 LS204)

ABSOLUTEMAXIMUM RATINGS

Symbol Parameter Value Unit

SupplyVoltage ±18 V
InputVoltage ±V

i

Differential Input Voltage ± (VCC-1)

id

Operating Temperature Range LS204C

LS204I
Power Dissipation at T
JunctionTemperature 150

j

=70oC 500 mW

amb

CC

0 to +70

-40 to +105

Storage Temperature Range -65 to +150

2/10

V

CC

V

V

T

oper

P

tot

T

T

stg

o

C

o

C

o

C

LS204

ELECTRICALCHARACTERISTICS (VCC= ±15V,T

Symbol Parameter Test Conditions

Supply Current 0.7 1.2 0.8 1.5 mA

I

CC

Input Bias Current 50 150 100 300 nA

I

ib

T

min.<Top<Tmax

Input Resistance f = 1kHz 1 1 MΩ

R

i

Input Offset Voltage Rs≤ 10kΩ 0.5 2.5 0.5 3.5 mV

V

io

≤ 10kΩ

R

s

.<Top<T

T

min

DV

DI

Input Offset VoltageDrift Rs≤ 10kΩ

io

I

Input OffsetCurrent 5 20 12 50 nA

io

Input OffsetCurrent Drift T

io

Output Short Circuit Current 23 23 mA

I

os

Large Signal Voltage Gain T

A

vd

.<Top<T

T

min

.<Top<T

T

min

.<Top<T

min

.<Top<T

min

=2kΩ VCC= ±15V

R

L

V

= 25oC, unless otherwisespecified)

amb

LS204I LS204C

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

. 300 700 nA

. 3.5 5

max

.2 2

max

. 40 100 nA

max

. 0.08 0.1 nA

max

.

CC

max

= ±4V

90 100

95

86 100

95

GBP Gain-Bandwidth Product f = 100kHz 1.8 3 1.5 2.5 MHz

Equivalent Input Noise Voltage f = 1kHz

e

n

THD Total Harmonic Distortion A

±V

V

Output Voltage Swing RL=2kΩ VCC= ±15V

opp

Large Signal Voltage Swing RL= 10kΩ f = 10kHz 28 28 V

opp

=50Ω

R

s

=1kΩ

R

s

= 10kΩ

R

s

= 20dB RL=2kΩ

V

=2VPPf = 1kHz

V

O

V

CC

= ±4V

8

15 10
10
18

12
20

0.03 0.1 0.03 0.1 %

±13

±3

±13

±3

SR Slew Rate Unity Gain, RL=2kΩ 0.8 1.5 1 V/µs

CMR Common Mode Rejection Ratio V

SVR Supply Voltage Rejection Ratio V

V

O1/VO2

Channel Separation f = 1kHz 100 120 120 dB

= 10V

ic

.<Top<T

T

min

= 1V f = 100Hz

ic

.<Top<T

T

min

.90 86

max

.90 86

max

Unit

mV

µV/

√Hz

°C

dB

nV

V

dB

dB

PP

o

C

3/10

LS204

4/10

LS204

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LS204

APPLICATION INFORMATION :
Active low-pass filter

BUTTERWORTH

The Butterworth is a ”maximally flat” amplitude
response filter (figure 10) Butterworth filters are
used forfilteringsignalsindataacquisitionsystems
to preventaliasing errors in samples-dataapplica­tions and forgeneralpurpose low-pass filtering.

The cut-off frequencyF

, is the frequency at which

c

the amplitude responseis down 3dB. The attenu­ation ratebeyondthecutofffrequencyisn6 dB per
octave of frequencywhere n is the order (number
of poles)of the filter.

Other characteristics:

.

Flattestpossible amplitude response

.

Excellentgain accuracyat low frequencyend
of passband

BESSEL

The Bessel is a type of ”linear phase” filter. Be­cause of their linear phase characteristics, these
filters approximate a constant time delay over a
limited frequency range. Bessel filters pass tran­sientwaveformswithaminimumofdistortion.They
are also used to provide time delays for low pass
filteringof modulatedwaveformsand asa”running
average” type filter.

−n

The maximumphase shift is

Π

radianswhere n

2

is the order (number of poles) of the filter. The

cut-off frequencyf

, isdefined as the frequencyat

c

which the phase shift is one half of this value. For
accurate delay, the cut-off frequency should be
twice the maximum signal frequency.

The followingtable can beused to obtainthe -3dB
frequency of the filter.

2 Pole 4 Pole 6 Pole 8 Pole

-3dB Frequency 0.77f

0.67fc 0.57fc 0.50fc

c

Other characteristics:

.

Selectivitynot as great as Chebyschev or But­terworth

.

Verylittle overshoot response to step inputs

.

Fast rise time

CHEBYSCHEV

Chebyschev filters have greater selectivity than
either Bessel ro Butterworth at the expense of
ripple in the passband(figure 11).

Chebyschev filters are normally designed with
peak-to-peakripple values from 0.2dB to 2dB.

Increasedripple in the passbandallowsincreased
attenuationabove thecut-off frequency.

The cut-off frequency is defined as the frequency
at which the amplitude response passes through
the specificedmaximumripplebandandenters the
stop band.

Other characteristics:

.

Greaterselectivity

.

Verynon-linearphase response

.

High overshoot responseto step inputs

The table below shows the typical overshoot and settlingtime response of the low pass filtersto a step input.

Number of

Poles

Butterworth 2

4
6
8

Bessel 2

4
6
8

Chebyschev (ripple ±0.25dB) 2

4
6
8

Chebyschev (ripple ±1dB) 2

4
6
8

Design of 2ndorder activelow pass filter (Sallen and Key configuration unity gain-op-amp)

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Peak

Overshoot

% Overshoot ±1% ±0.1% ±0.01%

4
11
14
16

0.4

0.8

0.6

0.1
11

18
21
23

21
28
32
34

Settling Time (% of final value)

1.1F

1.7/f

2.4/f

3.1/f

0.8/f

1.0/f

1.3/f

1.6/f

1.1/f

3.0/f

5.9/f

8.4/f

1.6/f

4.8/f

8.2/f

11.6/f

sec.

c

c
c
c

c
c
c
c

c
c
c
c

c
c
c

c

1.7Fcsec.

2.8/f

c

3.9/f

c

5.1/f

c

1.4/f

c

1.8/f

c

2.1/f

c

2.3/f

c

1.6/f

c

5.4/f

c

10.4/f

c

16.4/f

c

2.7/f

c

8.4/f

c

16.3/f

c

24.8/f

c

1.9Fcsec.

3.8/f

c

5.0/f

c

7.1/f

c

1.7/f

c

2.4/f

c

2.7/f

c

3.2/f

c

-

-

-

-

-

-

-

-

LS204

7/10

LS204

8/10

PACKAGE MECHANICALDATA

8 PINS- PLASTICDIP

LS204

Dim.

A 3.32 0.131

a1 0.51 0.020

B 1.15 1.65 0.045 0.065

b 0.356 0.55 0.014 0.022

b1 0.204 0.304 0.008 0.012

D 10.92 0.430
E 7.95 9.75 0.313 0.384

e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300

F 6.6 0260

i 5.08 0.200

L 3.18 3.81 0.125 0.150

Z 1.52 0.060

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

Millimeters Inches

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LS204

PACKAGE MECHANICALDATA

8 PINS- PLASTICMICROPACKAGE (SO)

Dim.

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

Millimeters Inches

A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033

b 0.35 0.48 0.014 0.019

b1 0.19 0.25 0.007 0.010

C 0.25 0.5 0.010 0.020
c1 45

o

(typ.)
D 4.8 5.0 0.189 0.197
E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 3.81 0.150

F 3.8 4.0 0.150 0.157

L 0.4 1.27 0.016 0.050
M 0.6 0.024
S8

Information furnished is believed to be accurateand reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for anyinfringement of patents or otherrights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previouslysupplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.

o

(max.)

10/10

 1998 SGS-THOMSON Microelectronics– Printed in Italy – All Rights Reserved

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